关于android：如何从URI获取完整文件路径

How to get the Full file path from URI

我想从URI获取完整的文件路径。 URI不是图像，但它是一个音乐文件，但如果我像MediaStore解决方案一样，如果应用程序用户选择例如Astro作为浏览器而不是音乐播放器，它将无法工作。我该如何解决这个问题？

采用：

1 2	String path = yourAndroidURI.uri.getPath() //"/mnt/sdcard/FileName.mp3" File file = new File(new URI(path));

要么

1 2	String path = yourAndroidURI.uri.toString() //"file:///mnt/sdcard/FileName.mp3" File file = new File(new URI(path));

相关讨论

PathUtil方法只能在下面的oreo中工作，如果它是oreo而不是它可能会崩溃，因为在oreo中我们不会得到id而是data.getData()中的整个路径所以你需要做的就是创建一个文件来自uri并从getPath()获取其路径并拆分它。下面是工作代码： -

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Uri uri = data.getData();
File file = new File(uri.getPath());//create path from uri
final String[] split = file.getPath().split(":");//split the path.
filePath = split[1];//assign it to a string(your choice).

上面的代码将在oreo中运行，如果它低于oreo，则PathUtil将起作用。谢谢！

1	String filePath=PathUtil.getPath(context,yourURI);

PathUtil.java

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

import java.net.URISyntaxException;

/**
* Created by Aki on 1/7/2017.
*/

public class PathUtil {
/*
* Gets the file path of the given Uri.
*/
@SuppressLint("NewApi")
public static String getPath(Context context, Uri uri) throws URISyntaxException {
final boolean needToCheckUri = Build.VERSION.SDK_INT >= 19;
String selection = null;
String[] selectionArgs = null;
// Uri is different in versions after KITKAT (Android 4.4), we need to
// deal with different Uris.
if (needToCheckUri && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) {
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
return Environment.getExternalStorageDirectory() +"/" + split[1];
} else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
uri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
} else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("image".equals(type)) {
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
selection ="_id=?";
selectionArgs = new String[]{ split[1] };
}
}
if ("content".equalsIgnoreCase(uri.getScheme())) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
if (cursor.moveToFirst()) {
return cursor.getString(column_index);
}
} catch (Exception e) {
}
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return"com.android.providers.media.documents".equals(uri.getAuthority());
}
}

相关讨论

尝试这个。

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public String getRealPathFromURI(Uri contentUri)
{
String[] proj = { MediaStore.Audio.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}

相关讨论

您可以使用不同SDK版本的get File路径

使用RealPathUtils

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public class RealPathUtils {

@SuppressLint("NewApi")
public static String getRealPathFromURI_API19(Context context, Uri uri){
String filePath ="";
String wholeID = DocumentsContract.getDocumentId(uri);

// Split at colon, use second item in the array
String id = wholeID.split(":")[1];

String[] column = { MediaStore.Images.Media.DATA };

// where id is equal to
String sel = MediaStore.Images.Media._ID +"=?";

Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{ id }, null);

int columnIndex = cursor.getColumnIndex(column[0]);

if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
return filePath;
}

@SuppressLint("NewApi")
public static String getRealPathFromURI_API11to18(Context context, Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
String result = null;

CursorLoader cursorLoader = new CursorLoader(
context,
contentUri, proj, null, null, null);
Cursor cursor = cursorLoader.loadInBackground();

if(cursor != null){
int column_index =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
result = cursor.getString(column_index);
}
return result;
}

public static String getRealPathFromURI_BelowAPI11(Context context, Uri contentUri){
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index
= cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
}

**现在从URI获取文件路径**

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String path = null;
if (Build.VERSION.SDK_INT < 11)
path = RealPathUtils.getRealPathFromURI_BelowAPI11(MainActivity.this, uri);

// SDK >= 11 && SDK < 19
else if (Build.VERSION.SDK_INT < 19)
path = RealPathUtils.getRealPathFromURI_API11to18(MainActivity.this, uri);

// SDK > 19 (Android 4.4)
else
path = RealPathUtils.getRealPathFromURI_API19(MainActivity.this, uri);
Log.d(TAG,"File Path:" + path);
// Get the file instance
File file = new File(path);

相关讨论

package com.utils;

import android.annotation.SuppressLint;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.annotation.RequiresApi;
import android.text.TextUtils;
import android.util.Log;

import org.apache.commons.io.IOUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

public class FileUtils {

/* Get uri related content real local file path. */
public static String getPath(Context ctx, Uri uri) {
String ret;
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// Android OS above sdk version 19.
ret = getUriRealPathAboveKitkat(ctx, uri);
} else {
// Android OS below sdk version 19
ret = getRealPath(ctx.getContentResolver(), uri, null);
}
} catch (Exception e) {
e.printStackTrace();
Log.d("DREG","FilePath Catch:" + e);
ret = getFilePathFromURI(ctx, uri);
}
return ret;
}

private static String getFilePathFromURI(Context context, Uri contentUri) {
//copy file and send new file path
String fileName = getFileName(contentUri);
if (!TextUtils.isEmpty(fileName)) {
String TEMP_DIR_PATH = Environment.getExternalStorageDirectory().getPath();
File copyFile = new File(TEMP_DIR_PATH + File.separator + fileName);
Log.d("DREG","FilePath copyFile:" + copyFile);
copy(context, contentUri, copyFile);
return copyFile.getAbsolutePath();
}
return null;
}

public static String getFileName(Uri uri) {
if (uri == null) return null;
String fileName = null;
String path = uri.getPath();
int cut = path.lastIndexOf('/');
if (cut != -1) {
fileName = path.substring(cut + 1);
}
return fileName;
}

public static void copy(Context context, Uri srcUri, File dstFile) {
try {
InputStream inputStream = context.getContentResolver().openInputStream(srcUri);
if (inputStream == null) return;
OutputStream outputStream = new FileOutputStream(dstFile);
IOUtils.copyStream(inputStream, outputStream); // org.apache.commons.io
inputStream.close();
outputStream.close();
} catch (Exception e) { // IOException
e.printStackTrace();
}
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private static String getUriRealPathAboveKitkat(Context ctx, Uri uri) {
String ret ="";

if (ctx != null && uri != null) {

if (isContentUri(uri)) {
if (isGooglePhotoDoc(uri.getAuthority())) {
ret = uri.getLastPathSegment();
} else {
ret = getRealPath(ctx.getContentResolver(), uri, null);
}
} else if (isFileUri(uri)) {
ret = uri.getPath();
} else if (isDocumentUri(ctx, uri)) {

// Get uri related document id.
String documentId = DocumentsContract.getDocumentId(uri);

// Get uri authority.
String uriAuthority = uri.getAuthority();

if (isMediaDoc(uriAuthority)) {
String idArr[] = documentId.split(":");
if (idArr.length == 2) {
// First item is document type.
String docType = idArr[0];

// Second item is document real id.
String realDocId = idArr[1];

// Get content uri by document type.
Uri mediaContentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
if ("image".equals(docType)) {
mediaContentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(docType)) {
mediaContentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(docType)) {
mediaContentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

// Get where clause with real document id.
String whereClause = MediaStore.Images.Media._ID +" =" + realDocId;

ret = getRealPath(ctx.getContentResolver(), mediaContentUri, whereClause);
}

} else if (isDownloadDoc(uriAuthority)) {
// Build download uri.
Uri downloadUri = Uri.parse("content://downloads/public_downloads");

// Append download document id at uri end.
Uri downloadUriAppendId = ContentUris.withAppendedId(downloadUri, Long.valueOf(documentId));

ret = getRealPath(ctx.getContentResolver(), downloadUriAppendId, null);

} else if (isExternalStoreDoc(uriAuthority)) {
String idArr[] = documentId.split(":");
if (idArr.length == 2) {
String type = idArr[0];
String realDocId = idArr[1];

if ("primary".equalsIgnoreCase(type)) {
ret = Environment.getExternalStorageDirectory() +"/" + realDocId;
}
}
}
}
}

return ret;
}

/* Check whether this uri represent a document or not. */
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private static boolean isDocumentUri(Context ctx, Uri uri) {
boolean ret = false;
if (ctx != null && uri != null) {
ret = DocumentsContract.isDocumentUri(ctx, uri);
}
return ret;
}

/* Check whether this uri is a content uri or not.
* content uri like content://media/external/images/media/1302716
* */
private static boolean isContentUri(Uri uri) {
boolean ret = false;
if (uri != null) {
String uriSchema = uri.getScheme();
if ("content".equalsIgnoreCase(uriSchema)) {
ret = true;
}
}
return ret;
}

/* Check whether this uri is a file uri or not.
* file uri like file:///storage/41B7-12F1/DCIM/Camera/IMG_20180211_095139.jpg
* */
private static boolean isFileUri(Uri uri) {
boolean ret = false;
if (uri != null) {
String uriSchema = uri.getScheme();
if ("file".equalsIgnoreCase(uriSchema)) {
ret = true;
}
}
return ret;
}

/* Check whether this document is provided by ExternalStorageProvider. */
private static boolean isExternalStoreDoc(String uriAuthority) {
boolean ret = false;

if ("com.android.externalstorage.documents".equals(uriAuthority)) {
ret = true;
}

return ret;
}

/* Check whether this document is provided by DownloadsProvider. */
private static boolean isDownloadDoc(String uriAuthority) {
boolean ret = false;

if ("com.android.providers.downloads.documents".equals(uriAuthority)) {
ret = true;
}

return ret;
}

/* Check whether this document is provided by MediaProvider. */
private static boolean isMediaDoc(String uriAuthority) {
boolean ret = false;

if ("com.android.providers.media.documents".equals(uriAuthority)) {
ret = true;
}

return ret;
}

/* Check whether this document is provided by google photos. */
private static boolean isGooglePhotoDoc(String uriAuthority) {
boolean ret = false;

if ("com.google.android.apps.photos.content".equals(uriAuthority)) {
ret = true;
}

return ret;
}

/* Return uri represented document file real local path.*/
@SuppressLint("Recycle")
private static String getRealPath(ContentResolver contentResolver, Uri uri, String whereClause) {
String ret ="";

// Query the uri with condition.
Cursor cursor = contentResolver.query(uri, null, whereClause, null, null);

if (cursor != null) {
boolean moveToFirst = cursor.moveToFirst();
if (moveToFirst) {

// Get columns name by uri type.
String columnName = MediaStore.Images.Media.DATA;

if (uri == MediaStore.Images.Media.EXTERNAL_CONTENT_URI) {
columnName = MediaStore.Images.Media.DATA;
} else if (uri == MediaStore.Audio.Media.EXTERNAL_CONTENT_URI) {
columnName = MediaStore.Audio.Media.DATA;
} else if (uri == MediaStore.Video.Media.EXTERNAL_CONTENT_URI) {
columnName = MediaStore.Video.Media.DATA;
}

// Get column index.
int columnIndex = cursor.getColumnIndex(columnName);

// Get column value which is the uri related file local path.
ret = cursor.getString(columnIndex);
}
}

return ret;
}

}

在build.gradle文件中
加上这个

1	implementation 'org.apache.commons:commons-lang3:3.4'

现在从主类中调用FileUtils.getPath(context, uri);。

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**Get path from URI Use below class for android all version.
access any type of File**.

package com.satya.filemangerdemo.common;

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.List;

public class FileUtils {
private static Uri contentUri = null;

/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* Callers should check whether the path is local before assuming it
* represents a local file.
*
* @param context The context.
* @param uri The Uri to query.
*/
@SuppressLint("NewApi")
public static String getPath(final Context context, final Uri uri) {
// check here to KITKAT or new version
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
String selection = null;
String[] selectionArgs = null;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

String fullPath = getPathFromExtSD(split);
if (fullPath !="") {
return fullPath;
} else {
return null;
}
}

// DownloadsProvider
else if (isDownloadsDocument(uri)) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
final String id;
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, new String[]{MediaStore.MediaColumns.DISPLAY_NAME}, null, null, null);
if (cursor != null && cursor.moveToFirst()) {
String fileName = cursor.getString(0);
String path = Environment.getExternalStorageDirectory().toString() +"/Download/" + fileName;
if (!TextUtils.isEmpty(path)) {
return path;
}
}
} finally {
if (cursor != null)
cursor.close();
}
id = DocumentsContract.getDocumentId(uri);
if (!TextUtils.isEmpty(id)) {
if (id.startsWith("raw:")) {
return id.replaceFirst("raw:","");
}
String[] contentUriPrefixesToTry = new String[]{
"content://downloads/public_downloads",
"content://downloads/my_downloads"
};
for (String contentUriPrefix : contentUriPrefixesToTry) {
try {
final Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id));

/* final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));*/

return getDataColumn(context, contentUri, null, null);
} catch (NumberFormatException e) {
//In Android 8 and Android P the id is not a number
return uri.getPath().replaceFirst("^/document/raw:","").replaceFirst("^raw:","");
}
}

}

} else {
final String id = DocumentsContract.getDocumentId(uri);
final boolean isOreo = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
if (id.startsWith("raw:")) {
return id.replaceFirst("raw:","");
}
try {
contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

} catch (NumberFormatException e) {
e.printStackTrace();
}
if (contentUri != null) {
return getDataColumn(context, contentUri, null, null);
}
}

}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;

if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
selection ="_id=?";
selectionArgs = new String[]{split[1]};

return getDataColumn(context, contentUri, selection,
selectionArgs);
} else if (isGoogleDriveUri(uri)) {
return getDriveFilePath(uri, context);
}
}

// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

if (isGooglePhotosUri(uri)) {
return uri.getLastPathSegment();
}

if (isGoogleDriveUri(uri)) {
return getDriveFilePath(uri, context);
}
if( Build.VERSION.SDK_INT == Build.VERSION_CODES.N)
{
// return getFilePathFromURI(context,uri);
return getMediaFilePathForN(uri, context);
// return getRealPathFromURI(context,uri);
}else
{

return getDataColumn(context, uri, null, null);
}

}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return null;
}

/**
* Check if a file exists on device
*
* @param filePath The absolute file path
*/
private static boolean fileExists(String filePath) {
File file = new File(filePath);

return file.exists();
}

/**
* Get full file path from external storage
*
* @param pathData The storage type and the relative path
*/
private static String getPathFromExtSD(String[] pathData) {
final String type = pathData[0];
final String relativePath ="/" + pathData[1];
String fullPath ="";

// on my Sony devices (4.4.4 & 5.1.1), `type` is a dynamic string
// something like"71F8-2C0A", some kind of unique id per storage
// don't know any API that can get the root path of that storage based on its id.
//
// so no"primary" type, but let the check here for other devices
if ("primary".equalsIgnoreCase(type)) {
fullPath = Environment.getExternalStorageDirectory() + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}
}

// Environment.isExternalStorageRemovable() is `true` for external and internal storage
// so we cannot relay on it.
//
// instead, for each possible path, check if file exists
// we'll start with secondary storage as this could be our (physically) removable sd card
fullPath = System.getenv("SECONDARY_STORAGE") + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}

fullPath = System.getenv("EXTERNAL_STORAGE") + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}

return fullPath;
}

private static String getDriveFilePath(Uri uri, Context context) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
/*
* Get the column indexes of the data in the Cursor,
* * move to the first row in the Cursor, get the data,
* * and display it.
* */
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getCacheDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();

//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);

final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size","Size" + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path","Path" + file.getPath());
Log.e("File Size","Size" + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}

private static String getMediaFilePathForN(Uri uri, Context context) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
/*
* Get the column indexes of the data in the Cursor,
* * move to the first row in the Cursor, get the data,
* * and display it.
* */
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getFilesDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();

//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);

final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size","Size" + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path","Path" + file.getPath());
Log.e("File Size","Size" + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}

private static String getDataColumn(Context context, Uri uri,
String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column ="_data";
final String[] projection = {column};

try {
cursor = context.getContentResolver().query(uri, projection,
selection, selectionArgs, null);

if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}

return null;
}

/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is ExternalStorageProvider.
*/
private static boolean isExternalStorageDocument(Uri uri) {
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is DownloadsProvider.
*/
private static boolean isDownloadsDocument(Uri uri) {
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is MediaProvider.
*/
private static boolean isMediaDocument(Uri uri) {
return"com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is Google Photos.
*/
private static boolean isGooglePhotosUri(Uri uri) {
return"com.google.android.apps.photos.content".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Drive.
*/
private static boolean isGoogleDriveUri(Uri uri) {
return"com.google.android.apps.docs.storage".equals(uri.getAuthority()) ||"com.google.android.apps.docs.storage.legacy".equals(uri.getAuthority());
}

}

相关讨论

我知道这已经得到了解答。但是我在评论中发现了一些问题。我从这里找到了一个很可靠的解决方案

使用它File file=FileUtils.getFile(uri);

public class FileUtils {

//replace this with your authority
public static final String AUTHORITY ="com.ianhanniballake.localstorage.documents";

private FileUtils() {
} //private constructor to enforce Singleton pattern

/**
* TAG for log messages.
*/
static final String TAG ="FileUtils";
private static final boolean DEBUG = false; // Set to true to enable logging

/**
* @return Whether the URI is a local one.
*/
public static boolean isLocal(String url) {
if (url != null && !url.startsWith("http://") && !url.startsWith("https://")) {
return true;
}
return false;
}

public static boolean isLocalStorageDocument(Uri uri) {
return AUTHORITY.equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
* @author paulburke
*/
public static boolean isExternalStorageDocument(Uri uri) {
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
* @author paulburke
*/
public static boolean isDownloadsDocument(Uri uri) {
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
* @author paulburke
*/
public static boolean isMediaDocument(Uri uri) {
return"com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return"com.google.android.apps.photos.content".equals(uri.getAuthority());
}

/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
* @author paulburke
*/
public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {

Cursor cursor = null;
final String column ="_data";
final String[] projection = {
column
};

try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
if (DEBUG)
DatabaseUtils.dumpCursor(cursor);

final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}

/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* Callers should check whether the path is local before assuming it
* represents a local file.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
* @see #isLocal(String)
* @see #getFile(Context, Uri)
*/
public static String getPath(final Context context, final Uri uri) {

final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// LocalStorageProvider
if (isLocalStorageDocument(uri)) {
// The path is the id
return DocumentsContract.getDocumentId(uri);
}
// ExternalStorageProvider
else if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() +"/" + split[1];
}

// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {

final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection ="_id=?";
final String[] selectionArgs = new String[]{
split[1]
};

return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();

return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return null;
}

/**
* Convert Uri into File, if possible.
*
* @return file A local file that the Uri was pointing to, or null if the
* Uri is unsupported or pointed to a remote resource.
* @author paulburke
* @see #getPath(Context, Uri)
*/
public static File getFile(Context context, Uri uri) {
if (uri != null) {
String path = getPath(context, uri);
if (path != null && isLocal(path)) {
return new File(path);
}
}
return null;
}

}

相关讨论

获取任何类型的文件路径使用此(取自https://github.com/iPaulPro/aFileChooser)

package com.yourpackage;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.util.Log;
import android.webkit.MimeTypeMap;

import java.io.File;
import java.io.FileFilter;
import java.text.DecimalFormat;
import java.util.Comparator;
import java.util.List;

/**
* @author Peli
* @author paulburke (ipaulpro)
* @version 2013-12-11
*/
public class FileUtils {
private FileUtils() {
} //private constructor to enforce Singleton pattern

/**
* TAG for log messages.
*/
static final String TAG ="FileUtils";
private static final boolean DEBUG = true; // Set to true to enable logging

public static final String MIME_TYPE_AUDIO ="audio/*";
public static final String MIME_TYPE_TEXT ="text/*";
public static final String MIME_TYPE_IMAGE ="image/*";
public static final String MIME_TYPE_VIDEO ="video/*";
public static final String MIME_TYPE_APP ="application/*";

public static final String HIDDEN_PREFIX =".";

/**
* Gets the extension of a file name, like".png" or".jpg".
*
* @param uri
* @return Extension including the dot(".");"" if there is no extension;
* null if uri was null.
*/
public static String getExtension(String uri) {
if (uri == null) {
return null;
}

int dot = uri.lastIndexOf(".");
if (dot >= 0) {
return uri.substring(dot);
} else {
// No extension.
return"";
}
}

/**
* @return Whether the URI is a local one.
*/
public static boolean isLocal(String url) {
if (url != null && !url.startsWith("http://") && !url.startsWith("https://")) {
return true;
}
return false;
}

/**
* @return True if Uri is a MediaStore Uri.
* @author paulburke
*/
public static boolean isMediaUri(Uri uri) {
return"media".equalsIgnoreCase(uri.getAuthority());
}

/**
* Convert File into Uri.
*
* @param file
* @return uri
*/
public static Uri getUri(File file) {
if (file != null) {
return Uri.fromFile(file);
}
return null;
}

/**
* Returns the path only (without file name).
*
* @param file
* @return
*/
public static File getPathWithoutFilename(File file) {
if (file != null) {
if (file.isDirectory()) {
// no file to be split off. Return everything
return file;
} else {
String filename = file.getName();
String filepath = file.getAbsolutePath();

// Construct path without file name.
String pathwithoutname = filepath.substring(0,
filepath.length() - filename.length());
if (pathwithoutname.endsWith("/")) {
pathwithoutname = pathwithoutname.substring(0, pathwithoutname.length() - 1);
}
return new File(pathwithoutname);
}
}
return null;
}

/**
* @return The MIME type for the given file.
*/
public static String getMimeType(File file) {

String extension = getExtension(file.getName());

if (extension.length() > 0)
return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension.substring(1));

return"application/octet-stream";
}

/**
* @return The MIME type for the give Uri.
*/
public static String getMimeType(Context context, Uri uri) {
File file = new File(getPath(context, uri));
return getMimeType(file);
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is {@link LocalStorageProvider}.
* @author paulburke
*/
public static boolean isLocalStorageDocument(Uri uri) {
return LocalStorageProvider.AUTHORITY.equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
* @author paulburke
*/
public static boolean isExternalStorageDocument(Uri uri) {
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
* @author paulburke
*/
public static boolean isDownloadsDocument(Uri uri) {
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
* @author paulburke
*/
public static boolean isMediaDocument(Uri uri) {
return"com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return"com.google.android.apps.photos.content".equals(uri.getAuthority());
}

/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
* @author paulburke
*/
public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {

Cursor cursor = null;
final String column ="_data";
final String[] projection = {
column
};

try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
if (DEBUG)
DatabaseUtils.dumpCursor(cursor);

final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
}catch (Exception e){
e.printStackTrace();
}finally {
if (cursor != null)
cursor.close();
}
return null;
}

/**
* Get a file path from a Uri. This will quickGet the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* Callers should check whether the path is local before assuming it
* represents a local file.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
* @see #isLocal(String)
* @see #getFile(Context, Uri)
*/
public static String getPath(final Context context, final Uri uri) {

if (DEBUG)
Log.d(TAG +" File -",
"Authority:" + uri.getAuthority() +
", Fragment:" + uri.getFragment() +
", Port:" + uri.getPort() +
", Query:" + uri.getQuery() +
", Scheme:" + uri.getScheme() +
", Host:" + uri.getHost() +
", Segments:" + uri.getPathSegments().toString()
);
// DocumentProvider
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, uri)) {
// LocalStorageProvider
if (isLocalStorageDocument(uri)) {
// The path is the id
return DocumentsContract.getDocumentId(uri);
}
// ExternalStorageProvider
else if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

// if ("primary".equalsIgnoreCase(type)) {
// return Environment.getExternalStorageDirectory() +"/" + split[1];
// }
return Environment.getExternalStorageDirectory() +"/" + split[1];

// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
try {
final String id = DocumentsContract.getDocumentId(uri);
Log.d(TAG,"getPath: id=" + id);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}catch (Exception e){
e.printStackTrace();
List<String> segments = uri.getPathSegments();
if(segments.size() > 1) {
String rawPath = segments.get(1);
if(!rawPath.startsWith("/")){
return rawPath.substring(rawPath.indexOf("/"));
}else {
return rawPath;
}
}
}
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection ="_id=?";
final String[] selectionArgs = new String[]{
split[1]
};

return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();

return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return null;
}

/**
* Convert Uri into File, if possible.
*
* @return file A local file that the Uri was pointing to, or null if the
* Uri is unsupported or pointed to a remote resource.
* @author paulburke
* @see #getPath(Context, Uri)
*/
public static File getFile(Context context, Uri uri) {
if (uri != null) {
String path = getPath(context, uri);
if (path != null && isLocal(path)) {
return new File(path);
}
}
return null;
}

/**
* Get the file size in a human-readable string.
*
* @param size
* @return
* @author paulburke
*/
public static String getReadableFileSize(int size) {
final int BYTES_IN_KILOBYTES = 1024;
final DecimalFormat dec = new DecimalFormat("###.#");
final String KILOBYTES =" KB";
final String MEGABYTES =" MB";
final String GIGABYTES =" GB";
float fileSize = 0;
String suffix = KILOBYTES;

if (size > BYTES_IN_KILOBYTES) {
fileSize = size / BYTES_IN_KILOBYTES;
if (fileSize > BYTES_IN_KILOBYTES) {
fileSize = fileSize / BYTES_IN_KILOBYTES;
if (fileSize > BYTES_IN_KILOBYTES) {
fileSize = fileSize / BYTES_IN_KILOBYTES;
suffix = GIGABYTES;
} else {
suffix = MEGABYTES;
}
}
}
return String.valueOf(dec.format(fileSize) + suffix);
}

/**
* Attempt to retrieve the thumbnail of given File from the MediaStore. This
* should not be called on the UI thread.
*
* @param context
* @param file
* @return
* @author paulburke
*/
public static Bitmap getThumbnail(Context context, File file) {
return getThumbnail(context, getUri(file), getMimeType(file));
}

/**
* Attempt to retrieve the thumbnail of given Uri from the MediaStore. This
* should not be called on the UI thread.
*
* @param context
* @param uri
* @return
* @author paulburke
*/
public static Bitmap getThumbnail(Context context, Uri uri) {
return getThumbnail(context, uri, getMimeType(context, uri));
}

/**
* Attempt to retrieve the thumbnail of given Uri from the MediaStore. This
* should not be called on the UI thread.
*
* @param context
* @param uri
* @param mimeType
* @return
* @author paulburke
*/
public static Bitmap getThumbnail(Context context, Uri uri, String mimeType) {
if (DEBUG)
Log.d(TAG,"Attempting to quickGet thumbnail");

if (!isMediaUri(uri)) {
Log.e(TAG,"You can only retrieve thumbnails for images and videos.");
return null;
}

Bitmap bm = null;
if (uri != null) {
final ContentResolver resolver = context.getContentResolver();
Cursor cursor = null;
try {
cursor = resolver.query(uri, null, null, null, null);
if (cursor.moveToFirst()) {
final int id = cursor.getInt(0);
if (DEBUG)
Log.d(TAG,"Got thumb ID:" + id);

if (mimeType.contains("video")) {
bm = MediaStore.Video.Thumbnails.getThumbnail(
resolver,
id,
MediaStore.Video.Thumbnails.MINI_KIND,
null);
} else if (mimeType.contains(FileUtils.MIME_TYPE_IMAGE)) {
bm = MediaStore.Images.Thumbnails.getThumbnail(
resolver,
id,
MediaStore.Images.Thumbnails.MINI_KIND,
null);
}
}
} catch (Exception e) {
if (DEBUG)
Log.e(TAG,"getThumbnail", e);
} finally {
if (cursor != null)
cursor.close();
}
}
return bm;
}

/**
* File and folder comparator. TODO Expose sorting option method
*
* @author paulburke
*/
public static Comparator<File> sComparator = new Comparator<File>() {
@Override
public int compare(File f1, File f2) {
// Sort alphabetically by lower case, which is much cleaner
return f1.getName().toLowerCase().compareTo(
f2.getName().toLowerCase());
}
};

/**
* File (not directories) filter.
*
* @author paulburke
*/
public static FileFilter sFileFilter = new FileFilter() {
@Override
public boolean accept(File file) {
final String fileName = file.getName();
// Return files only (not directories) and skip hidden files
return file.isFile() && !fileName.startsWith(HIDDEN_PREFIX);
}
};

/**
* Folder (directories) filter.
*
* @author paulburke
*/
public static FileFilter sDirFilter = new FileFilter() {
@Override
public boolean accept(File file) {
final String fileName = file.getName();
// Return directories only and skip hidden directories
return file.isDirectory() && !fileName.startsWith(HIDDEN_PREFIX);
}
};

/**
* Get the Intent for selecting content to be used in an Intent Chooser.
*
* @return The intent for opening a file with Intent.createChooser()
* @author paulburke
*/
public static Intent createGetContentIntent() {
// Implicitly allow the user to select a particular kind of data
final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// The MIME data type filter
intent.setType("*/*");
// Only return URIs that can be opened with ContentResolver
intent.addCategory(Intent.CATEGORY_OPENABLE);
return intent;
}
}

相关讨论

收到文件路径时的代码段代码。

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Uri fileUri = data.getData();
FilePathHelper filePathHelper = new FilePathHelper();
String path ="";
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
if (filePathHelper.getPathnew(fileUri, this) != null) {
path = filePathHelper.getPathnew(fileUri, this).toLowerCase();
} else {
path = filePathHelper.getFilePathFromURI(fileUri, this).toLowerCase();
}
} else {
path = filePathHelper.getPath(fileUri, this).toLowerCase();
}

Bellow是一个可以通过创建新对象来访问的类。您还需要在grade1 implementation 'org.apache.directory.studio:org.apache.commons.io:2.4'中添加依赖项

public class FilePathHelper {

public FilePathHelper(){

}

public String getMimeType(String url) {
String type = null;
String extension = MimeTypeMap.getFileExtensionFromUrl(url.replace("",""));
if (extension != null) {
type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}
return type;
}

public String getFilePathFromURI(Uri contentUri, Context context) {
//copy file and send new file path
String fileName = getFileName(contentUri);
if (!TextUtils.isEmpty(fileName)) {
File copyFile = new File(context.getExternalCacheDir() + File.separator + fileName);
copy(context, contentUri, copyFile);
return copyFile.getAbsolutePath();
}
return null;
}

public void copy(Context context, Uri srcUri, File dstFile) {
try {
InputStream inputStream = context.getContentResolver().openInputStream(srcUri);
if (inputStream == null) return;
OutputStream outputStream = new FileOutputStream(dstFile);
IOUtils.copy(inputStream, outputStream);
inputStream.close();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public String getPath(Uri uri, Context context) {
String filePath = null;
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
if (isKitKat) {
filePath = generateFromKitkat(uri, context);
}

if (filePath != null) {
return filePath;
}

Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.MediaColumns.DATA}, null, null, null);

if (cursor != null) {
if (cursor.moveToFirst()) {
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
filePath = cursor.getString(columnIndex);
}
cursor.close();
}
return filePath == null ? uri.getPath() : filePath;
}

@TargetApi(19)
private String generateFromKitkat(Uri uri, Context context) {
String filePath = null;
if (DocumentsContract.isDocumentUri(context, uri)) {
String wholeID = DocumentsContract.getDocumentId(uri);

String id = wholeID.split(":")[1];

String[] column = {MediaStore.Video.Media.DATA};
String sel = MediaStore.Video.Media._ID +"=?";

Cursor cursor = context.getContentResolver().
query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{id}, null);

int columnIndex = cursor.getColumnIndex(column[0]);

if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}

cursor.close();
}
return filePath;
}

public String getFileName(Uri uri) {
if (uri == null) return null;
String fileName = null;
String path = uri.getPath();
int cut = path.lastIndexOf('/');
if (cut != -1) {
fileName = path.substring(cut + 1);
}
return fileName;
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public String getPathnew(Uri uri, Context context) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() +"/" + split[1];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection ="_id=?";
final String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}

public String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column ="_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("Something with exception -" + e.toString());
} finally {
if (cursor != null)
cursor.close();
}
return null;
}

public boolean isExternalStorageDocument(Uri uri) {
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public boolean isDownloadsDocument(Uri uri) {
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public boolean isMediaDocument(Uri uri) {
return"com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public boolean isGooglePhotosUri(Uri uri) {
return"com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}

我很难在Xamarin上解决这个问题。从上面的建议我想出了这个解决方案。

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private string getRealPathFromURI(Android.Net.Uri contentUri)
{
string filename ="";
string thepath ="";
Android.Net.Uri filePathUri;
ICursor cursor = this.ContentResolver.Query(contentUri, null, null, null, null);

if (cursor.MoveToFirst())
{
int column_index = cursor.GetColumnIndex(MediaStore.Images.Media.InterfaceConsts.Data);//Instead of"MediaStore.Images.Media.DATA" can be used"_data"
filePathUri = Android.Net.Uri.Parse(cursor.GetString(column_index));
filename = filePathUri.LastPathSegment;
thepath = filePathUri.Path;
}

return thepath;
}

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String uri_path ="file:///mnt/sdcard/FileName.mp3";
File f = new removeUriFromPath(uri_path));
public static String removeUriFromPath(String uri)
{
return uri.substring(7, uri.length());
}

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