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Adds Stackoverflow example for Retrofit
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‎com.vogella.android.retrofitstackoverflow/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/workspace.xml
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/.idea/libraries
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.DS_Store
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/build
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/captures

‎com.vogella.android.retrofitstackoverflow/app/.gitignore‎

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/build

‎com.vogella.android.retrofitstackoverflow/app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 24
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buildToolsVersion "24.0.0"
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defaultConfig {
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applicationId "com.vogella.android.retrofitstackoverflow"
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minSdkVersion 23
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targetSdkVersion 24
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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compile fileTree(dir: 'libs', include: ['*.jar'])
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androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
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exclude group: 'com.android.support', module: 'support-annotations'
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})
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compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha3'
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testCompile 'junit:junit:4.12'
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compile 'com.squareup.retrofit2:retrofit:2.1.0'
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compile 'com.squareup.retrofit2:converter-gson:2.1.0'
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}

‎com.vogella.android.retrofitstackoverflow/app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# By default, the flags in this file are appended to flags specified
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# in /home/vogella/Android/Sdk/tools/proguard/proguard-android.txt
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# You can edit the include path and order by changing the proguardFiles
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# directive in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# Add any project specific keep options here:
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}

‎com.vogella.android.retrofitstackoverflow/app/src/androidTest/java/com/vogella/android/retrofitstackoverflow/ExampleInstrumentedTest.java‎

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package com.vogella.android.retrofitstackoverflow;
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import android.content.Context;
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import android.support.test.InstrumentationRegistry;
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import android.support.test.runner.AndroidJUnit4;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import static org.junit.Assert.*;
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/**
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* Instrumentation test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() throws Exception {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getTargetContext();
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assertEquals("com.vogella.android.retrofitstackoverflow", appContext.getPackageName());
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}
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}

‎com.vogella.android.retrofitstackoverflow/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.vogella.android.retrofitstackoverflow">
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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="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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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>

‎com.vogella.android.retrofitstackoverflow/app/src/main/java/com/vogella/android/retrofitstackoverflow/MainActivity.java‎

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package com.vogella.android.retrofitstackoverflow;
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import android.app.Activity;
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import android.app.ListActivity;
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import android.os.Bundle;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.Window;
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import android.widget.ArrayAdapter;
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import android.widget.Toast;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import java.util.ArrayList;
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import retrofit2.Call;
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import retrofit2.Callback;
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import retrofit2.Response;
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import retrofit2.Retrofit;
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import retrofit2.converter.gson.GsonConverterFactory;
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public class MainActivity extends ListActivity implements Callback<StackOverflowQuestions> {
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
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requestWindowFeature(Window.FEATURE_PROGRESS);
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ArrayAdapter<Question> arrayAdapter =
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new ArrayAdapter<Question>(this,
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android.R.layout.simple_list_item_1,
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android.R.id.text1,
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new ArrayList<Question>());
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setListAdapter(arrayAdapter);
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setProgressBarIndeterminateVisibility(true);
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setProgressBarVisibility(true);
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu) {
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getMenuInflater().inflate(R.menu.main_menu, menu);
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return true;
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}
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@Override
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public boolean onOptionsItemSelected(MenuItem item) {
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setProgressBarIndeterminateVisibility(true);
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Gson gson = new GsonBuilder()
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.setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
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.create();
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Retrofit retrofit = new Retrofit.Builder()
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.baseUrl("https://api.stackexchange.com")
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.addConverterFactory(GsonConverterFactory.create(gson))
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.build();
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// prepare call in Retrofit 2.0
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StackOverflowAPI stackOverflowAPI = retrofit.create(StackOverflowAPI.class);
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Call<StackOverflowQuestions> call = stackOverflowAPI.loadQuestions("android");
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//asynchronous call
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call.enqueue(this);
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// synchronous call would be with execute, in this case you
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// would have to perform this outside the main thread
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// call.execute()
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// to cancel a running request
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// call.cancel();
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// calls can only be used once but you can easily clone them
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//Call<StackOverflowQuestions> c = call.clone();
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//c.enqueue(this);
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return true;
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}
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@Override
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public void onResponse(Call<StackOverflowQuestions> call, Response<StackOverflowQuestions> response) {
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setProgressBarIndeterminateVisibility(false);
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ArrayAdapter<Question> adapter = (ArrayAdapter<Question>) getListAdapter();
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adapter.clear();
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adapter.addAll(response.body().items);
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}
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@Override
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public void onFailure(Call<StackOverflowQuestions> call, Throwable t) {
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Toast.makeText(MainActivity.this, t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
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}
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}

‎com.vogella.android.retrofitstackoverflow/app/src/main/java/com/vogella/android/retrofitstackoverflow/Question.java‎

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package com.vogella.android.retrofitstackoverflow;
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// This is used to map the JSON keys to the object by GSON
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public class Question {
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String title;
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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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}

‎com.vogella.android.retrofitstackoverflow/app/src/main/java/com/vogella/android/retrofitstackoverflow/StackOverflowAPI.java‎

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package com.vogella.android.retrofitstackoverflow;
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import retrofit2.Callback;
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import retrofit2.http.GET;
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import retrofit2.http.Query;
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import retrofit2.Call;
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public interface StackOverflowAPI {
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@GET("/2.2/questions?order=desc&sort=creation&site=stackoverflow")
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Call<StackOverflowQuestions> loadQuestions(@Query("tagged") String tags);
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}

‎com.vogella.android.retrofitstackoverflow/app/src/main/java/com/vogella/android/retrofitstackoverflow/StackOverflowQuestions.java‎

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package com.vogella.android.retrofitstackoverflow;
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import java.util.List;
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public class StackOverflowQuestions {
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List<Question> items;
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}

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