Android 定时任务

package com.example.timingtask;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
private Intent intent;

// 定时任务
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

intent = new Intent(this, TimeRunningService.class);

}

public void click(View view) {
Toast.makeText(getApplicationContext(), "定时任务已经启动", Toast.LENGTH_SHORT).show();
startService(intent);
}
}

package com.example.timingtask;

import java.util.Date;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.SystemClock;

public class TimeRunningService extends Service {

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub

new Thread() {
@Override
public void run() {
android.util.Log.i("TimeRunningService : ", new Date().toString());
super.run();
}
}.start();

AlarmManager alarmService = (AlarmManager)getSystemService(ALARM_SERVICE);
Intent intent2 = new Intent(this, AlarmBroadcastReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent2, 0);
System.out.println("*********************");
long realtime = SystemClock.elapsedRealtime();
long triggerTime = realtime + 5 * 1000;// 每隔5秒出发一次
System.out.println("realtime " + realtime);
System.out.println("triggerTime " + triggerTime);
System.out.println("*********************");
alarmService.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerTime, pendingIntent);
return super.onStartCommand(intent, flags, startId);
}
}

package com.example.timingtask;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class AlarmBroadcastReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

Log.i("AlarmBroadcastReceiver", "onReceive");
Intent intent2 = new Intent(context, TimeRunningService.class);
context.startService(intent2);
}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.timingtask"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="19"
android:targetSdkVersion="21" />

<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="com.example.timingtask.TimeRunningService" >
</service>

<receiver android:name="com.example.timingtask.AlarmBroadcastReceiver" >
</receiver>
</application>

</manifest>