Added Job Scheduler

Author: Paul Ruiz

AndroidWearDigitalWatchFace/README.md

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+### Tuts+ article: Using the Android JobScheduler
+
+### Instructor: Paul Trebilcox-Ruiz
+
+The JobScheduler API was introduced in Android Lollipop, and is used for batching and scheduling future tasks that run in the background of the device when certain conditions are met. 
+
+Available March 2015 on TutsPlus.com

JobScheduler/README.md

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+/build

JobScheduler/app/.gitignore

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 21
+    buildToolsVersion "21.1.2"
+
+    defaultConfig {
+        applicationId "com.tutsplus.jobscheduler"
+        minSdkVersion 21
+        targetSdkVersion 21
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+}

JobScheduler/app/build.gradle

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

JobScheduler/app/proguard-rules.pro

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+package com.tutsplus.jobscheduler;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

JobScheduler/app/src/androidTest/java/com/tutsplus/jobscheduler/ApplicationTest.java

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.tutsplus.jobscheduler" >
+
+    <application
+        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>
+
+        <service android:name=".JobSchedulerService"
+            android:permission="android.permission.BIND_JOB_SERVICE" />
+    </application>
+
+</manifest>

JobScheduler/app/src/main/AndroidManifest.xml

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+package com.tutsplus.jobscheduler;
+
+import android.app.job.JobParameters;
+import android.app.job.JobService;
+import android.os.Handler;
+import android.os.Message;
+import android.widget.Toast;
+
+/**
+ * Created by paulruiz on 3/7/15.
+ */
+public class JobSchedulerService extends JobService {
+
+    private Handler mJobHandler = new Handler( new Handler.Callback() {
+        @Override
+        public boolean handleMessage( Message msg ) {
+            Toast.makeText( getApplicationContext(), "JobService task running", Toast.LENGTH_SHORT ).show();
+            jobFinished( (JobParameters) msg.obj, false );
+            return true;
+        }
+    } );
+
+    @Override
+    public boolean onStartJob(JobParameters params ) {
+        mJobHandler.sendMessage( Message.obtain( mJobHandler, 1, params ) );
+        return true;
+    }
+
+    @Override
+    public boolean onStopJob( JobParameters params ) {
+        mJobHandler.removeMessages( 1 );
+        return false;
+    }
+
+}

JobScheduler/app/src/main/java/com/tutsplus/jobscheduler/JobSchedulerService.java

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+package com.tutsplus.jobscheduler;
+
+import android.app.Activity;
+import android.app.job.JobInfo;
+import android.app.job.JobScheduler;
+import android.content.ComponentName;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+
+
+public class MainActivity extends Activity {
+
+    private JobScheduler mJobScheduler;
+    private Button mScheduleJobButton;
+    private Button mCancelAllJobsButton;
+
+    @Override
+    protected void onCreate( Bundle savedInstanceState ) {
+        super.onCreate( savedInstanceState );
+        setContentView( R.layout.activity_main );
+        mJobScheduler = (JobScheduler) getSystemService( Context.JOB_SCHEDULER_SERVICE );
+        mScheduleJobButton = (Button) findViewById( R.id.schedule_job );
+        mCancelAllJobsButton = (Button) findViewById( R.id.cancel_all );
+
+        mScheduleJobButton.setOnClickListener( new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                JobInfo.Builder builder = new JobInfo.Builder( 1,
+                        new ComponentName( getPackageName(), JobSchedulerService.class.getName() ) );
+
+                builder.setPeriodic( 3000 );
+
+
+                if( mJobScheduler.schedule( builder.build() ) <= 0 ) {
+                    //If something goes wrong
+                }
+            }
+        });
+
+        mCancelAllJobsButton.setOnClickListener( new View.OnClickListener() {
+            @Override
+            public void onClick( View v ) {
+                mJobScheduler.cancelAll();
+            }
+        });
+    }
+}