Volley的Get、Post方式（JsonObjectRequest、StringRequest）以及Volley擷取圖片的3種方式

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activity_main.xml 裡面什麼也沒有

AndroidManifest.xml（重點是android:name="com.example.volley.MyApplication"）

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.volley"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="18"        android:targetSdkVersion="18" />    <application        android:name="com.example.volley.MyApplication"        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-permission android:name="android.permission.INTERNET" /></manifest>

MyApplication

package com.example.volley;import com.android.volley.RequestQueue;import com.android.volley.toolbox.Volley;import android.app.Application;public class MyApplication extends Application {public static RequestQueue queue;/** 一旦建立就建立RequestQueue請求隊列 */@Overridepublic void onCreate() {super.onCreate();queue = Volley.newRequestQueue(getApplicationContext());}/** 對外提供靜態方法 */public static RequestQueue getHttpRequestQueue() {return queue;}}

MainActivity

package com.example.volley;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.util.HashMap;import java.util.Map;import org.json.JSONObject;import com.android.volley.Request.Method;import com.android.volley.AuthFailureError;import com.android.volley.Response;import com.android.volley.Response.Listener;import com.android.volley.VolleyError;import com.android.volley.toolbox.JsonObjectRequest;import com.android.volley.toolbox.StringRequest;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.Toast;public class MainActivity extends Activity {/** * 關聯activity。退出之後取消全部的網路請求，釋放資源 */@Overrideprotected void onStop() {super.onStop();MyApplication.getHttpRequestQueue().cancelAll("abcGet");}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//volley_get();volley_post();}/** * get請求方式 */private void volley_get() {/** * String類型 */String url = "http://www.imooc.com/api/teacher?
type=4&num=30";StringRequest request = new StringRequest(Method.GET, url,new Listener<String>() {@Overridepublic void onResponse(String arg0) {//返回正確後的操作Log.e("TAG", ""+arg0);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError arg0) {}});// 設定標籤request.setTag("abcGet");MyApplication.getHttpRequestQueue().add(request);MyApplication.getHttpRequestQueue().start();/** * JsonObjectRequest類型 由於get參數已經在url寫好了，所以傳空就可以 */JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Method.GET,url, null, new Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject arg0) {Toast.makeText(MainActivity.this, arg0.toString(), 0).show();}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError arg0) {}});// 設定標籤jsonObjectRequest.setTag("bcdGet");MyApplication.getHttpRequestQueue().add(jsonObjectRequest);MyApplication.getHttpRequestQueue().start();/** * 還有jsonArray方式,這裡省略了。。。 */}/** * post請求方式 */private void volley_post() {/** * StringRequest---post方式 */String url = "http://www.imooc.com/api/teacher?
";StringRequest request = new StringRequest(Method.POST, url,new Listener<String>() {@Overridepublic void onResponse(String arg0) {Log.e("TAG", ""+arg0);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError arg0) {}}) {@Overrideprotected Map<String, String> getParams() throws AuthFailureError {//傳遞參數Map<String, String> map = new HashMap<String, String>();map.put("type", "4");map.put("num", "30");return map;}};// 設定標籤request.setTag("abcPost");MyApplication.getHttpRequestQueue().add(request);MyApplication.getHttpRequestQueue().start();/** * jsonObject--post方式 */HashMap<String, String> map = new HashMap<String, String>();map.put("type", "4");map.put("num", "30");// 將map轉為jsonObject對象JSONObject object = new JSONObject(map);JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Method.POST, url,object, new Listener<JSONObject>() {@Overridepublic void onResponse(JSONObject arg0) {Log.e("TAG", arg0.toString());}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError arg0) {}});// 設定標籤jsonObjectRequest.setTag("bcdPost");MyApplication.getHttpRequestQueue().add(jsonObjectRequest);MyApplication.getHttpRequestQueue().start();}}

*************************************************下載網狀圖片**********************************************

AndroidManifest.xml（重點是 android:name="com.example.volleyimagedemo.MyApplication"）

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.volleyimagedemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="18"        android:targetSdkVersion="18" />    <application        android:name="com.example.volleyimagedemo.MyApplication"        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-permission android:name="android.permission.INTERNET"/></manifest>

activity_main.xml

<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"    tools:context="com.example.volleyimagedemo.MainActivity" >    <!-- 方式一 -->    <ImageView        android:id="@+id/imageview1"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />         <!-- 方式二 -->    <ImageView        android:id="@+id/imageview2"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <!-- 方式三 -->    <com.android.volley.toolbox.NetworkImageView        android:id="@+id/networkImageview"        android:layout_width="fill_parent"        android:layout_height="wrap_content" >    </com.android.volley.toolbox.NetworkImageView>        </LinearLayout>

MyApplication

package com.example.volleyimagedemo;import com.android.volley.RequestQueue;import com.android.volley.toolbox.Volley;import android.app.Application;public class MyApplication extends Application {public static RequestQueue queue;@Overridepublic void onCreate() {super.onCreate();queue = Volley.newRequestQueue(getApplicationContext());}public static RequestQueue getHttpRequestQueue() {return queue;}}

BitMapCache

package com.example.volleyimagedemo;import android.graphics.Bitmap;import android.util.LruCache;import com.android.volley.toolbox.ImageLoader.ImageCache;public class BitMapCache implements ImageCache{public LruCache<String, Bitmap> cache;//超過10兆，自己主動回收public int max = 10*1024*1024;public BitMapCache(){cache = new LruCache<String, Bitmap>(max){@Overrideprotected int sizeOf(String key, Bitmap value) {return value.getRowBytes()*value.getHeight();}};}@Overridepublic Bitmap getBitmap(String arg0) {return cache.get(arg0);}@Overridepublic void putBitmap(String arg0, Bitmap arg1) {cache.put(arg0, arg1);}}

MainActivity

package com.example.volleyimagedemo;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.os.Bundle;import android.widget.ImageView;import com.android.volley.Response;import com.android.volley.Response.Listener;import com.android.volley.VolleyError;import com.android.volley.toolbox.ImageLoader;import com.android.volley.toolbox.ImageLoader.ImageListener;import com.android.volley.toolbox.ImageRequest;import com.android.volley.toolbox.NetworkImageView;public class MainActivity extends Activity {private ImageView imageview1;private ImageView imageview2;private NetworkImageView networkImageView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/** 擷取控制項、圖片url地址 */imageview1 = (ImageView) findViewById(R.id.imageview1);imageview2 = (ImageView) findViewById(R.id.imageview2);networkImageView = (NetworkImageView) findViewById(R.id.networkImageview);String url = "http://img.mukewang.com/55237dcc0001128c06000338-300-170.jpg";/** * 下載圖片的另外一種方式ImageLoader+BitMapCache */// imageCache單肚使用是不到緩衝效果，須要結合lruCacheImageLoader imageLoader1 = new ImageLoader(MyApplication.getHttpRequestQueue(), new BitMapCache());networkImageView.setDefaultImageResId(R.drawable.ic_launcher);networkImageView.setErrorImageResId(R.drawable.ic_launcher);networkImageView.setImageUrl(url, imageLoader1);/** * 下載圖片的第三種種方式 */ImageLoader imageLoader2 = new ImageLoader(MyApplication.getHttpRequestQueue(), new BitMapCache());// view視圖，預設的圖片，錯誤的圖片ImageListener listener = imageLoader1.getImageListener(imageview2,R.drawable.ic_launcher, R.drawable.ic_launcher);imageLoader2.get(url, listener);/** * 下載網狀圖片的第一種方式ImageRequest */// // 0 是原圖的方式載入--Config.RGB_565原圖ImageRequest imageRequest = new ImageRequest(url,new Listener<Bitmap>() {//@Overridepublic void onResponse(Bitmap arg0) {imageview1.setImageBitmap(arg0);}}, 0, 0, Config.RGB_565, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError arg0) {imageview1.setBackgroundResource(R.drawable.ic_launcher);}});MyApplication.getHttpRequestQueue().add(imageRequest);MyApplication.getHttpRequestQueue().start();}}

Volley的Get、Post方式（JsonObjectRequest、StringRequest）以及Volley擷取圖片的3種方式