<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent">   <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="啟動鬧鐘"    android:id="@+id/button"    android:onClick="startAlarmClick"    android:layout_alignParentEnd="true"    android:layout_alignParentStart="true" />   <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="設(shè)置鬧鐘"    android:id="@+id/button2"    android:layout_below="@+id/button"    android:onClick="startSetAlarmClick"    android:layout_alignParentStart="true"    android:layout_alignParentEnd="true" /> </RelativeLayout>

package com.example.haige.alarmmanager; import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity{  protected void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);  }   /*  啟動鬧鐘   */  public void startAlarmClick(View view)  {    //獲取系統(tǒng)的鬧鐘服務(wù)    AlarmManager am= (AlarmManager) getSystemService(Context.ALARM_SERVICE);    //觸發(fā)鬧鐘的時間（毫秒）    long triggerTime= System.currentTimeMillis()+3000;    Intent intent=new Intent(this,Alarmctivity.class);    PendingIntent op=PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);    //啟動一次只會執(zhí)行一次的鬧鐘    am.set(AlarmManager.RTC,triggerTime,op);//    //指定時間重復(fù)執(zhí)行鬧鐘//    am.setRepeating(AlarmManager.RTC,triggerTime,2000,op);  }   /*  設(shè)置鬧鐘   */  public void startSetAlarmClick(View view)  {    //獲取系統(tǒng)的鬧鐘服務(wù)    AlarmManager am= (AlarmManager) getSystemService(Context.ALARM_SERVICE);    //觸發(fā)鬧鐘的時間（毫秒）    long triggerTime= System.currentTimeMillis()+3000;    Intent intent=new Intent(this,AlarmReceiver.class);    PendingIntent op=PendingIntent.getBroadcast(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);    //啟動一次只會執(zhí)行一次的鬧鐘    am.set(AlarmManager.RTC,triggerTime,op);//    //指定時間重復(fù)執(zhí)行鬧鐘//    am.setRepeating(AlarmManager.RTC,triggerTime,2000,op);  }}

<?xml version="1.0" encoding="utf-8"?><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"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context="com.example.haige.alarmmanager.Alarmctivity"> </RelativeLayout>

package com.example.haige.alarmmanager; import android.app.Activity;import android.app.AlarmManager;import android.app.AlertDialog;import android.app.PendingIntent;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.media.MediaPlayer;import android.net.Uri;import android.os.Bundle;import java.io.IOException; public class Alarmctivity extends Activity{  MediaPlayer mp;  protected void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_alarmctivity);    mp = new MediaPlayer();    try {      mp.setDataSource(this, Uri.parse("/storage/sdcard1/kugou/聽力/南拳媽媽-你不像她.mp3"));      mp.prepare();    } catch (IOException e) {      e.printStackTrace();    }    mp.setLooping(true);    mp.start();    alarmOialog();  }    @Override  protected void onResume() {    super.onResume();  }   @Override  protected void onDestroy() {    super.onDestroy();    if(mp!=null)    {      if(mp.isPlaying())      {        mp.stop();      }      mp.release();    }  }   public void alarmOialog() {    AlertDialog.Builder builder = new AlertDialog.Builder(this);    builder.setMessage("大哥，大妹子喊你起床啦！");    builder.setPositiveButton("再來一次", new DialogInterface.OnClickListener() {       @Override      public void onClick(DialogInterface dialogInterface, int i) {        alarm();        finish();      }    });     builder.setNegativeButton("停止", new DialogInterface.OnClickListener() {       @Override      public void onClick(DialogInterface dialogInterface, int i) {        finish();//關(guān)閉窗口      }    });    builder.show();  }   private void alarm() {    //獲取系統(tǒng)的鬧鐘服務(wù)    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);    //觸發(fā)鬧鐘的時間（毫秒）    long triggerTime = System.currentTimeMillis() + 5000;    Intent intent = new Intent(this, Alarmctivity.class);    PendingIntent op = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);    //啟動一次只會執(zhí)行一次的鬧鐘    am.set(AlarmManager.RTC, triggerTime, op);    //指定時間重復(fù)執(zhí)行鬧鐘//    am.setRepeating(AlarmManager.RTC,triggerTime,2000,op);  } }

package com.example.haige.alarmmanager; import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast; public class AlarmReceiver extends BroadcastReceiver {  public AlarmReceiver() {  }   @Override  public void onReceive(Context context, Intent intent) {    Toast.makeText(context,"起床啦，起床啦！",Toast.LENGTH_SHORT).show();  }}