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new sample project
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‎HTTP/Volley/app/build.gradle‎

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apply plugin: 'com.android.application'
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dependencies {
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compile 'de.greenrobot:eventbus:2.4.0'
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compile project(':volley')
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compile 'com.google.code.gson:gson:2.5'
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compile 'com.android.support:support-v4:23.1.1'
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}
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android {
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compileSdkVersion 19
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buildToolsVersion "21.1.2"
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}

‎HTTP/Volley/app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.commonsware.android.volley"
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android:versionCode="1"
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android:versionName="1.0">
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<uses-sdk
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android:minSdkVersion="11"
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android:targetSdkVersion="17"/>
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<uses-permission android:name="android.permission.INTERNET"/>
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<application
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android:allowBackup="true"
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android:icon="@drawable/ic_launcher"
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android:label="@string/app_name"
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android:theme="@style/AppTheme">
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<activity
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android:name=".MainActivity"
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android:label="@string/app_name">
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/GsonRequest.java‎

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// from https://gist.github.com/ficusk/5474673
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package com.commonsware.android.volley;
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import com.google.gson.Gson;
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import com.google.gson.JsonSyntaxException;
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import com.android.volley.AuthFailureError;
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import com.android.volley.NetworkResponse;
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import com.android.volley.ParseError;
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import com.android.volley.Request;
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import com.android.volley.Response;
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import com.android.volley.Response.ErrorListener;
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import com.android.volley.Response.Listener;
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import com.android.volley.toolbox.HttpHeaderParser;
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import java.io.UnsupportedEncodingException;
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import java.util.Map;
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/**
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* Volley adapter for JSON requests that will be parsed into Java objects by Gson.
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*/
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public class GsonRequest<T> extends Request<T> {
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private final Gson gson = new Gson();
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private final Class<T> clazz;
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private final Map<String, String> headers;
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private final Listener<T> listener;
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/**
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* Make a GET request and return a parsed object from JSON.
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*
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* @param url URL of the request to make
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* @param clazz Relevant class object, for Gson's reflection
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* @param headers Map of request headers
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*/
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public GsonRequest(String url, Class<T> clazz, Map<String, String> headers,
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Listener<T> listener, ErrorListener errorListener) {
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super(Method.GET, url, errorListener);
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this.clazz = clazz;
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this.headers = headers;
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this.listener = listener;
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}
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@Override
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public Map<String, String> getHeaders() throws AuthFailureError {
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return headers != null ? headers : super.getHeaders();
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}
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@Override
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protected void deliverResponse(T response) {
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listener.onResponse(response);
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}
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@Override
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protected Response<T> parseNetworkResponse(NetworkResponse response) {
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try {
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String json = new String(
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response.data, HttpHeaderParser.parseCharset(response.headers));
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return Response.success(
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gson.fromJson(json, clazz), HttpHeaderParser.parseCacheHeaders(response));
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} catch (UnsupportedEncodingException e) {
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return Response.error(new ParseError(e));
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} catch (JsonSyntaxException e) {
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return Response.error(new ParseError(e));
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}
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}
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/Item.java‎

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/***
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Copyright (c) 2013 CommonsWare, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy
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of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
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by applicable law or agreed to in writing, software distributed under the
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License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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OF ANY KIND, either express or implied. See the License for the specific
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language governing permissions and limitations under the License.
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From _The Busy Coder's Guide to Android Development_
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https://commonsware.com/Android
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*/
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package com.commonsware.android.volley;
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public class Item {
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String title;
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Owner owner;
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String link;
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@Override
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public String toString() {
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return(title);
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}
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/LruBitmapCache.java‎

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// from http://developer.android.com/training/volley/request.html
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package com.commonsware.android.volley;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.support.v4.util.LruCache;
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import android.util.DisplayMetrics;
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import com.android.volley.toolbox.ImageLoader.ImageCache;
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public class LruBitmapCache extends LruCache<String, Bitmap>
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implements ImageCache {
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public LruBitmapCache(int maxSize) {
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super(maxSize);
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}
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public LruBitmapCache(Context ctx) {
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this(getCacheSize(ctx));
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}
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@Override
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protected int sizeOf(String key, Bitmap value) {
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return value.getRowBytes() * value.getHeight();
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}
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@Override
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public Bitmap getBitmap(String url) {
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return get(url);
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}
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@Override
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public void putBitmap(String url, Bitmap bitmap) {
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put(url, bitmap);
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}
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// Returns a cache size equal to approximately three screens worth of images.
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public static int getCacheSize(Context ctx) {
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final DisplayMetrics displayMetrics = ctx.getResources().
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getDisplayMetrics();
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final int screenWidth = displayMetrics.widthPixels;
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final int screenHeight = displayMetrics.heightPixels;
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// 4 bytes per pixel
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final int screenBytes = screenWidth * screenHeight * 4;
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return screenBytes * 3;
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}
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/MainActivity.java‎

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/***
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Copyright (c) 2013-2014 CommonsWare, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy
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of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
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by applicable law or agreed to in writing, software distributed under the
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License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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OF ANY KIND, either express or implied. See the License for the specific
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language governing permissions and limitations under the License.
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From _The Busy Coder's Guide to Android Development_
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https://commonsware.com/Android
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*/
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package com.commonsware.android.volley;
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import android.app.Activity;
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import android.content.Intent;
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import android.net.Uri;
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import android.os.Bundle;
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import de.greenrobot.event.EventBus;
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public class MainActivity extends Activity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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if (getFragmentManager().findFragmentById(android.R.id.content) == null) {
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getFragmentManager().beginTransaction()
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.add(android.R.id.content,
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new QuestionsFragment()).commit();
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}
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}
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@Override
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public void onResume() {
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super.onResume();
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EventBus.getDefault().register(this);
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}
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@Override
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public void onPause() {
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EventBus.getDefault().unregister(this);
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super.onPause();
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}
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public void onEventMainThread(QuestionClickedEvent event) {
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startActivity(new Intent(Intent.ACTION_VIEW,
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Uri.parse(event.item.link)));
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}
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/Owner.java‎

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/***
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Copyright (c) 2013 CommonsWare, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy
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of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
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by applicable law or agreed to in writing, software distributed under the
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License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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OF ANY KIND, either express or implied. See the License for the specific
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language governing permissions and limitations under the License.
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From _The Busy Coder's Guide to Android Development_
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https://commonsware.com/Android
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*/
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package com.commonsware.android.volley;
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import com.google.gson.annotations.SerializedName;
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public class Owner {
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@SerializedName("profile_image") String profileImage;
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/QuestionClickedEvent.java‎

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/***
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Copyright (c) 2013-2014 CommonsWare, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy
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of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
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by applicable law or agreed to in writing, software distributed under the
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License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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OF ANY KIND, either express or implied. See the License for the specific
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language governing permissions and limitations under the License.
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From _The Busy Coder's Guide to Android Development_
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https://commonsware.com/Android
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*/
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package com.commonsware.android.volley;
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public class QuestionClickedEvent {
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final Item item;
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QuestionClickedEvent(Item item) {
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this.item=item;
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}
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}

‎HTTP/Volley/app/src/main/java/com/commonsware/android/volley/QuestionsFragment.java‎

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/***
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Copyright (c) 2013-2016 CommonsWare, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy
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of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
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by applicable law or agreed to in writing, software distributed under the
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License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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OF ANY KIND, either express or implied. See the License for the specific
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language governing permissions and limitations under the License.
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From _The Busy Coder's Guide to Android Development_
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https://commonsware.com/Android
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*/
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package com.commonsware.android.volley;
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import android.app.ListFragment;
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import android.os.Bundle;
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import android.text.Html;
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import android.util.Log;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ArrayAdapter;
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import android.widget.ImageView;
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import android.widget.ListView;
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import android.widget.TextView;
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import android.widget.Toast;
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import com.android.volley.RequestQueue;
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import com.android.volley.Response;
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import com.android.volley.VolleyError;
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import com.android.volley.toolbox.Volley;
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import java.util.List;
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import de.greenrobot.event.EventBus;
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public class QuestionsFragment extends ListFragment implements
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Response.Listener<SOQuestions>, Response.ErrorListener {
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setRetainInstance(true);
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}
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@Override
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public void onViewCreated(View view,
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Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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GsonRequest<SOQuestions> request=
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new GsonRequest<SOQuestions>(getString(R.string.url),
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SOQuestions.class, null, this, this);
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VolleyManager.get(getActivity()).enqueue(request);
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}
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@Override
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public void onListItemClick(ListView l, View v, int position, long id) {
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Item item=((ItemsAdapter)getListAdapter()).getItem(position);
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EventBus.getDefault().post(new QuestionClickedEvent(item));
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}
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@Override
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public void onErrorResponse(VolleyError error) {
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Toast.makeText(getActivity(), error.getMessage(),
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Toast.LENGTH_LONG).show();
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Log.e(getClass().getSimpleName(),
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"Exception from Volley request to StackOverflow", error);
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}
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@Override
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public void onResponse(SOQuestions questions) {
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setListAdapter(new ItemsAdapter(questions.items));
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}
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class ItemsAdapter extends ArrayAdapter<Item> {
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ItemsAdapter(List<Item> items) {
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super(getActivity(), R.layout.row, R.id.title, items);
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}
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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View row=super.getView(position, convertView, parent);
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Item item=getItem(position);
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ImageView icon=(ImageView)row.findViewById(R.id.icon);
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VolleyManager
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.get(getActivity())
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.loadImage(item.owner.profileImage, icon,
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R.drawable.owner_placeholder,
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R.drawable.owner_error);
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TextView title=(TextView)row.findViewById(R.id.title);
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title.setText(Html.fromHtml(getItem(position).title));
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return(row);
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}
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}
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}

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