在广播接收器上，检查写入权限 android M

On broadcast receiver, check for write permission android M

我使用媒体文件夹 android.hardware.action.NEW_PICTURE 服务的广播接收器使用此代码重命名和移动图像并且它正在运行：

CameraReciver
包 perim.ebrahimi.ir.perim;

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import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;

public class CameraReciver extends BroadcastReceiver {

private States states;
private SessionManager session;
private WriteService main;

@Override
public void onReceive(Context context, Intent intent) {
getStates(context);
if(states.getAPP()){

Cursor cursor = context.getContentResolver().query(intent.getData(), null, null, null, null);
cursor.moveToFirst();
if(cursor!=null){
String image_path = cursor.getString(cursor.getColumnIndex("_data"));
main = new WriteService();
main.writeFolder(image_path, states, context);
}
cursor.close();
} else abortBroadcast();
}

// OK
private void getStates(Context context){
session = new SessionManager(context.getApplicationContext());
states = new States();
states = session.getSession();
}

}

这里是 WriteService:

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package perim.ebrahimi.ir.perim;

import android.app.Activity;
import android.app.Application;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class WriteService extends Activity {

private States states;
private Context context;
private static CalendarJalalian cal;
private static int day ;
private static int month ;
private static int year ;
private static int saat ;
private static int minut ;
private static int secnd ;
private int orientation = -1;
private static final int REQUEST_EXTERNAL_STORAGE = 100;
private static final int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS=200;
private boolean mExternalStorageAvailable = false;
private boolean mExternalStorageWriteable = false;

// @Override
// protected void onCreate(Bundle savedInstanceState) {
// super.onCreate(savedInstanceState);
// //setContentView(R.layout.activity_main);
//
// // A simple check of whether runtime permissions need to be managed
// if (Build.VERSION.SDK_INT >= 23) {
// checkMultiplePermissions();
// }
// }

public void writeFolder(String image_path, States _states, Context _context){
states = _states;
context= _context;
cal = new CalendarJalalian();
long fileSize = new File(image_path).length();
Cursor mediaCursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[] {MediaStore.Images.ImageColumns.ORIENTATION,
MediaStore.MediaColumns.SIZE },
MediaStore.MediaColumns.DATE_ADDED +">=?",
new String[]{String.valueOf(cal.getTimeInMillis()/1000 - 1)},
MediaStore.MediaColumns.DATE_ADDED +" desc");
if (mediaCursor != null && mediaCursor.getCount() !=0 ) {
while(mediaCursor.moveToNext()){
long size = mediaCursor.getLong(1);
if(size == fileSize){
orientation = mediaCursor.getInt(0);
break;
}
}
}
orientation = (orientation<0)?0:orientation;
image_path = changeName(image_path);
if(image_path.length()==0) return;
String image_jadid = copyFile(image_path);
if(states.getMain() && image_jadid.length()>0){
removeMain(image_path);
removeMedia(context, new File(image_path));
}
if(states.getPayam()) Toast.makeText(this, getText(R.string.imageSaved)+":"+states.getKhas(), 500).show();

}

private void checkExternalStorage(){
String[] aaa = new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE};
ActivityCompat.requestPermissions(this, aaa , REQUEST_EXTERNAL_STORAGE);
if(ContextCompat.checkSelfPermission(context, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_EXTERNAL_STORAGE);
} else {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
}
}

private static void removeMedia(Context context, File f) {
ContentResolver resolver = context.getContentResolver();
resolver.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, MediaStore.Images.Media.DATA +"=?", new String[] { f.getAbsolutePath() });
}

// OK
private String changeName(String image_path){
String result ="";
day = cal.getDay();
month = cal.getMonth();
year = cal.getYear();
saat = Integer.parseInt(cal.getHHour());
minut = Integer.parseInt(cal.getMinute());
secnd = Integer.parseInt(cal.getSecond());

String persianDateName = String.format("%1$s_%2$s_%3$s__%4$s_%5$s_%6$s.jpg",
year,
((month<10)?"0"+month:month),
((day<10)?"0"+day:day),
((saat<10)?"0"+saat:saat),
((minut<10)?"0"+minut:minut),
((secnd<10)?"0"+secnd:secnd));

File from = new File(image_path);
if(from.exists()){
if(states.getOnimage()){
addTextToImage(image_path, persianDateName);
}
File to = new File(from.getParentFile(),persianDateName);
try
{
boolean b = from.renameTo(to);
if (!b) {
copy(from, to);
from.delete();
}
removeMedia(context, from);
sendToMedia(to, persianDateName);
result = to.getAbsolutePath();
}
catch(Exception ex){
ex.printStackTrace();
}
}
return result;
}

private void addTextToImage(String from, String persianDateName) {
Log.i("info","Draw"+persianDateName+" on image");
try
{
Log.i("info","1");
FileOutputStream fos = new FileOutputStream(from);
if(fos==null) Log.i("info","fos = null");

Log.i("info","2 ="+from);
Bitmap bitmap = BitmapFactory.decodeFile(from);
if(bitmap==null) Log.i("info","bitmap = null");

// Log.i("info","3");
android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
if(bitmapConfig==null) Log.i("info","bitmapConfig = null");

// Log.i("info","4");
// if (bitmapConfig == null) {
// bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
// }

Log.i("info","5");
bitmap = bitmap.copy(bitmapConfig, true);

Log.i("info","6");
Canvas canvas = new Canvas(bitmap);

Log.i("info","7");
Resources resources = this.getResources();
float scale = resources.getDisplayMetrics().density;

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.rgb(61, 61, 61));
paint.setTextSize((int) (14 * scale));
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
Rect qab = new Rect();
paint.getTextBounds(persianDateName, 0, persianDateName.length(), qab);
int x = (bitmap.getWidth() - qab.width()) / 2;
int y = (bitmap.getHeight() + qab.height()) / 2;
canvas.drawText(persianDateName, x, y, paint);

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
}
catch (IOException e)
{
e.printStackTrace();
}
Log.i("info","Text added on image");
}

private void copy(final File f1, final File f2) throws IOException {
if(f2.exists()) f2.delete();
//checkExternalStorage();
checkMultiplePermissions();
if(mExternalStorageAvailable && mExternalStorageWriteable) {
f2.createNewFile();
final RandomAccessFile file1 = new RandomAccessFile(f1,"r");
final RandomAccessFile file2 = new RandomAccessFile(f2,"rw");
file2.getChannel().write(file1.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, f1.length()));
file1.close();
file2.close();
}
}

private boolean canRename(final File f1, final File f2) {
final String p1 = f1.getAbsolutePath().replaceAll("^(/mnt/|/)","");
final String p2 = f2.getAbsolutePath().replaceAll("^(/mnt/|/)","");
return p1.replaceAll("\\\\/\\\\w+","").equals(p2.replaceAll("\\\\/\\\\w+",""));
}

// OK
private void removeMain(String image_path){
File f = new File(image_path);
if(f.exists()) f.delete();
}

// OK
private File createFileName(){
day = cal.getDay();
month = cal.getMonth();
year = cal.getYear();
saat = Integer.parseInt(cal.getHHour());
minut = Integer.parseInt(cal.getMinute());
secnd = Integer.parseInt(cal.getSecond());

String persianDateName = String.format("%1$s_%2$s_%3$s__%4$s_%5$s_%6$s.jpg",
year,
((month<10)?"0"+month:month),
((day<10)?"0"+day:day),
((saat<10)?"0"+saat:saat),
((minut<10)?"0"+minut:minut),
((secnd<10)?"0"+secnd:secnd));

String masirFolder ="";

if(states.getSal()) masirFolder += year;
if(states.getMah()) masirFolder += File.separator+ year+"_"+((month<10)?"0"+month:month);
if(states.getRuz()) masirFolder += File.separator+ year+"_"+((month<10)?"0"+month:month)+"_"+((day<10)?"0"+day:day);

if(states.getSaat()) masirFolder += File.separator+ year+"_"+((month<10)?"0"+month:month)+"_"+((day<10)?"0"+day:day)+"_"+((saat<10)?"0"+saat:saat);
if(states.getMinut()) masirFolder += File.separator+ year+"_"+((month<10)?"0"+month:month)+"_"+((day<10)?"0"+day:day)+"_"+((saat<10)?"0"+saat:saat)+"_"+((minut<10)?"0"+minut:minut);

if(states.getKhas().length()>0) masirFolder += File.separator+states.getKhas();

File directTime = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), masirFolder);

if (!directTime.mkdir()) makeDir(directTime);

directTime = new File(directTime, persianDateName);

return directTime;

}

// OK
private void makeDir(File direct){
direct.mkdirs();
}

// OK
private String copyFile(String image_path){
String masir ="";
File sourceFile = new File(image_path);
if (!sourceFile.exists()) {return masir;}
File destinationFile = createFileName();
FileChannel source = null;
FileChannel destination = null;

try {
source = new FileInputStream(sourceFile).getChannel();
destination = new FileOutputStream(destinationFile).getChannel();
if (destination != null && source != null) {
destination.transferFrom(source, 0, source.size());
}
if (source != null) {
source.close();
}
if (destination != null) {
destination.close();
}
masir = destinationFile.getName();
sendToMedia(destinationFile, masir);
masir = destinationFile.getAbsolutePath();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return masir;
}

// OK
private void sendToMedia(File imageFile, String imageTitle){
ContentValues image = new ContentValues();
Date dateTaken = new Date();

File parent = imageFile.getParentFile();
String path = parent.toString().toLowerCase();
String name = parent.getName().toLowerCase();

image.put(MediaStore.Images.Media.TITLE, imageTitle);
image.put(MediaStore.Images.Media.DISPLAY_NAME, String.format(this.getText(R.string.imageDisplayName).toString(),states.getKhas()));
image.put(MediaStore.Images.Media.DESCRIPTION, String.format(this.getText(R.string.imageDescription).toString(),name));
image.put(MediaStore.Images.Media.DATE_ADDED, dateTaken.toString());
image.put(MediaStore.Images.Media.DATE_TAKEN, dateTaken.toString());
image.put(MediaStore.Images.Media.DATE_MODIFIED, dateTaken.toString());
image.put(MediaStore.Images.Media.MIME_TYPE,"image/png");
image.put(MediaStore.Images.Media.ORIENTATION, orientation);//getImageOrientation(imageFile.getAbsolutePath()));

image.put(MediaStore.Images.ImageColumns.BUCKET_ID, path.hashCode());
image.put(MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME, name);
image.put(MediaStore.Images.Media.SIZE, imageFile.length());
image.put(MediaStore.Images.Media.DATA, imageFile.getAbsolutePath());

this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, image);
}

private void checkMultiplePermissions() {

if (Build.VERSION.SDK_INT >= 23) {
List<String> permissionsNeeded = new ArrayList<String>();
List<String> permissionsList = new ArrayList<String>();

if (!addPermission(permissionsList, android.Manifest.permission.ACCESS_FINE_LOCATION)) {
permissionsNeeded.add("GPS");
}

if (!addPermission(permissionsList, android.Manifest.permission.READ_EXTERNAL_STORAGE)) {
permissionsNeeded.add("Read Storage");
}

if (permissionsList.size() > 0) {
requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
return;
}
}
}

private boolean addPermission(List<String> permissionsList, String permission) {
try {
if (Build.VERSION.SDK_INT >= 23)

if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
permissionsList.add(permission);

if (!shouldShowRequestPermissionRationale(permission))
return false;
}
} catch(Exception ex){
ex.printStackTrace();
}
return true;
}
}

但是类 addPermission 引发错误：

java.lang.NullPointerException: Attempt to invoke virtual method 'int
android.content.Context.checkSelfPermission(java.lang.String)' on a
null object reference

我认为我调用活动的方式不正确，但我不知道该怎么做，请帮助。

编辑：
我在返回的路径中发现了这种差异：

1	String image_path = cursor.getString(cursor.getColumnIndex("_data"));

变化的部分很明显：

1 2	old but correct path: /storage/emulated/0/DCIM/Camera/IMG_20161215_173334.jpg new but incorrect path: /storage/3466-033/DCIM/Camera/IMG_20161215_173334.jpg

我认为由于新设备允许用户选择保存图像的位置，因此返回地址会相应更改。
如何从光标中获取正确的地址？