Android -- 闹钟服务的使用（启动与停止）

public class firstActivity extends Activity {
    private static final String AM_ACTION = "iflab.test.AM_ACTION"; // ACTION常量

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn1 = (Button) findViewById(R.id.button1); // 获取对象
        Button btn2 = (Button) findViewById(R.id.button2);
        final AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);// 获取系统服务
        Intent intent = new Intent(); // Intent对象
        intent.setAction(AM_ACTION); // 设置Action
        intent.putExtra("message", "该下班啦！"); // 传递字符串
        final PendingIntent pendingIntent = PendingIntent.getBroadcast(
                firstActivity.this, 0, intent, 0);
        final long time = System.currentTimeMillis(); // 设置当前时间

        btn1.setOnClickListener(new View.OnClickListener() { // 监听器

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub //设置重复闹钟提醒
                alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, time,
                        8 * 1000, pendingIntent);
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() { // 监听器

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                alarmManager.cancel(pendingIntent); // 取消闹钟
            }
        });
    }
}

public class myReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context arg0, Intent arg1) {
        // TODO Auto-generated method stub
        String str;
        str="触发重复闹钟："+arg1.getStringExtra("message");
        Toast.makeText(arg0, str,Toast.LENGTH_LONG).show();        //显示
    }
}