Android Service实现闹钟

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1.MainActivity.class中开启服务

import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Intent intent = new Intent(this, LongRunningService.class);        startService(intent);    }}

2.LongRunningService.class中获取闹钟服务，并定时10s，然后启动AlarmActivity.class

import android.app.AlarmManager;import android.app.PendingIntent;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.os.SystemClock;import android.util.Log;import java.util.Date;/** * Created by admin on 16-5-31. */public class LongRunningService extends Service{    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        new Thread(new Runnable() {            @Override            public void run() {                Log.i("LongRunningService", "executed at " + new Date().toString());            }        }).start();        AlarmManager manager = (AlarmManager) getSystemService(ALARM_SERVICE);        int anHour = 10 * 1000;        long triggerAtTime = SystemClock.elapsedRealtime() + anHour;        Intent i = new Intent(this, AlarmActivity.class);        PendingIntent pi = PendingIntent.getActivity(this, 0, i, 0);        manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pi);//1min后返回执行        return super.onStartCommand(intent, flags, startId);    }}

3.AlarmActivity.class中实例化一个对话框，并播放音乐

import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class AlarmActivity extends Activity {    MediaPlayer mAlarmMusic;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mAlarmMusic = MediaPlayer.create(this,R.raw.alarm);        mAlarmMusic.setLooping(true);        mAlarmMusic.start();        new AlertDialog.Builder(AlarmActivity.this).setTitle("Alarm !!!")                .setMessage("Time Out,GO!")                .setPositiveButton("OK", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        mAlarmMusic.stop();                        AlarmActivity.this.finish();                    }                }).show();    }}

实现效果，如下图所示。

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