关于android：使用ArrayAdapter将凌空响应传递给listview

Passing volley response to listview using an ArrayAdapter

我不知道如何使用适配器(myadapter)将volley响应传递给listview。我是否使用myadapter.add()并传递它什么？我读了教程，经过几周的努力，我认为是时候寻求帮助了。所以如果你有时间，我很感激你能帮我。谢谢。我可以在文本视图中显示响应。

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package hfad.com.adapters;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends Activity {

//thorntech.com parsing jsonandroid using colley library
TextView results;
// URL of object to be parsed
String JsonURL ="https://raw.githubusercontent.com/ianbar20/JSON-Volley-Tutorial/master/Example-JSON-Files/Example-Array.JSON";
// This string will hold the results
String data ="";
// Defining the Volley request queue that handles the URL request concurrently

ListView myList;

RequestQueue requestQueue;

//Adding adapter and assign it -set- to a listview

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Creates the Volley request queue
requestQueue = Volley.newRequestQueue(this);

// Casts results into the TextView found within the main layout XML with id jsonData
results = (TextView) findViewById(R.id.textView);
myList = (ListView) findViewById(R.id.listv);
final ArrayAdapter<String> myAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);
ListView myList = (ListView) findViewById(R.id.listv);
myList.setAdapter(myAdapter);

// Creating the JsonArrayRequest class called arrayreq, passing the required parameters
//JsonURL is the URL to be fetched from
JsonArrayRequest arrayreq = new JsonArrayRequest(JsonURL,
// The second parameter Listener overrides the method onResponse() and passes
//JSONArray as a parameter
new Response.Listener<JSONArray>() {

// Takes the response from the JSON request
@Override
public void onResponse(JSONArray response) {

//Juan suggestion:
ArrayList<String> myArraylist
myArraylist = new ArrayList<String>();

}}

my mainactivity.xml：包括一个textview和listview。

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp"
tools:context=".MainActivity"
android:weightSum="1">

<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />

<ListView
android:id="@+id/listv"
android:layout_width="match_parent"
android:layout_height="89dp"/>

</LinearLayout>

我的问题是如何使用arrayadapter将截击的响应传递给listview？

相关讨论

在这里：

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public void onResponse(JSONArray response) {

}

您应该遍历jsonarray，提取每个字符串并放入一个ArrayList。

1	ArrayList<String> stringsFromJson = new ArrayList<>();

然后，在同一个位置，将值设置为适配器：

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myAdapter.clear();
myAdapter.addAll(stringsFromJson);
myAdapter.notifyDataSetChanged();

另外，您的适配器应该定义为ArrayAdapter。

编辑1

你需要考虑的一些事情：

您必须向您的清单添加Internet权限

在您粘贴的代码中，您实际上并没有向服务器发送请求。为此，您需要将请求添加到请求队列中。

您要获取的JSON不仅仅是字符串列表，因此根据您想要显示的内容，您可能需要更改ListView的布局、适配器和/或填充适配器后面的ArrayList的方式。

为了提供一个示例，我选择了用形状名称填充ListView的简单替代方法。你可以尝试和改变其他的选择。

显示

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.apackagename.so_43691098">

<uses-permission android:name="android.permission.INTERNET"/>

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">

<intent-filter>

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

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package com.apackagename.so_43691098;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

public class SO_43691098 extends AppCompatActivity {

private static final String TAG = SO_43691098.class.getSimpleName();

//thorntech.com parsing jsonandroid using colley library
TextView results;
// URL of object to be parsed
String JsonURL ="https://raw.githubusercontent.com/ianbar20/JSON-Volley-Tutorial/master/Example-JSON-Files/Example-Array.JSON";
// This string will hold the results
String data ="";
// Defining the Volley request queue that handles the URL request concurrently

ListView myList;

RequestQueue requestQueue;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
// Creates the Volley request queue
requestQueue = Volley.newRequestQueue(this);

// Casts results into the TextView found within the main layout XML with id jsonData
results = (TextView) findViewById(R.id.textView);
myList = (ListView) findViewById(R.id.listv);
final ArrayAdapter<String> myAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);
ListView myList = (ListView) findViewById(R.id.listv);
myList.setAdapter(myAdapter);

// Creating the JsonArrayRequest class called arrayreq, passing the required parameters
//JsonURL is the URL to be fetched from
JsonArrayRequest arrayRequest = new JsonArrayRequest(JsonURL,
new Response.Listener<JSONArray>(){

@Override
public void onResponse(JSONArray response) {
//Juan suggestion:
ArrayList<String> myArrayList = new ArrayList<>();

try {
JSONArray shapes = response.getJSONObject(1).getJSONArray("shapeArray");
for(int i=0; i<shapes.length(); i++) {
myArrayList.add(shapes.getJSONObject(i).getString("shapeName"));
}
} catch (JSONException e){
Log.e(TAG,"Getting shape name", e);
}

myAdapter.clear();
myAdapter.addAll(myArrayList);
myAdapter.notifyDataSetChanged();
}
},
new Response.ErrorListener(){

@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, error.getMessage(), error);
}
}
);

requestQueue.add(arrayRequest);

}
}

我没有更改布局。