AlarmManager定时重复任务，发送心跳

来源：互联网发布：linux挂载ntfs分区编辑：程序博客网时间：2024/04/29 18:20

package com.example.alarm_1;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Intent intent = new Intent();intent.setClass(MainActivity.this, MyService.class);PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent,0);AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);Log.i("Alarm", "Alarm");// am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 5*1000,// pendingIntent);  ///单次不重复 am.setRepeating(AlarmManager.RTC_WAKEUP , System.currentTimeMillis(), 10*1000, pendingIntent);//////TTTT   重复//am.setInexactRepeating(AlarmManager.RTC_WAKEUP,//System.currentTimeMillis(), 10 * 1000, pendingIntent);////TTTT  重复}}

package com.example.alarm_1;import java.util.Date;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.IBinder;import android.util.Log;import android.widget.Toast;/** * @author Administrator *  */public class MyService extends Service {@Overridepublic IBinder onBind(Intent intent) {// TODO 自动生成的方法存根return null;}@Overridepublic void onCreate() {// TODO 自动生成的方法存根}@Overridepublic void onStart(Intent intent, int startId) {// TODO 自动生成的方法存根try {Thread.sleep(5000);} catch (InterruptedException e) {// TODO 自动生成的 catch 块e.printStackTrace();}// player.stop();Log.i("--------------------暂停----------------------", "暂停");Toast.makeText(this, "暂停", Toast.LENGTH_SHORT).show();}@Overridepublic void onDestroy() {// TODO 自动生成的方法存根}}// / class MyService

<RelativeLayout 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"    tools:context="${relativePackage}.${activityClass}" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.alarm_1"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="15"        android:targetSdkVersion="16" />    <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=".MyService"            android:enabled="true" >        </service>    </application></manifest>

效果是：每隔10s执行一次服务，延迟5s后显示“暂停”提示，循环发生。这个有大作用，这5s可以访问数据库，往里写数据，或者保持在线状态，

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