问题描述

android开的简单闹钟，模仿教程，出现问题求助

MainActivity.java如下
public class MainActivity extends ActionBarActivity {
private Button bt=null;
private AlarmManager am=null;
Calendar cal=Calendar.getInstance();
final int DIALOD_TIME=0;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    am=(AlarmManager)getSystemService(ALARM_SERVICE);    bt=(Button)findViewById(R.id.bt);    bt.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            showDialog(DIALOD_TIME);        }    });}@Overrideprotected Dialog onCreateDialog(int id) {    // TODO Auto-generated method stub    Dialog dialog=null;    switch(id){    case DIALOD_TIME:        dialog=new TimePickerDialog(thisnew OnTimeSetListener() {            @Override            public void onTimeSet(TimePicker view int hourOfDay int minute) {                Calendar c=Calendar.getInstance();                //设置Calendar对象                c.setTimeInMillis(System.currentTimeMillis());                //设置时分秒毫秒                c.set(Calendar.HOUR_OF_DAYhourOfDay);                c.set(Calendar.MINUTEminute);                c.set(Calendar.SECOND0);                c.set(Calendar.MILLISECOND0);                Intent intent=new Intent(MainActivity.thisAlarmReceiver.class);                PendingIntent pi=PendingIntent.getBroadcast(MainActivity.this0 intent 0);                am.set(AlarmManager.RTC_WAKEUPc.getTimeInMillis() pi);                Toast.makeText(MainActivity.this闹钟设置成功""Toast.LENGTH_SHORT).show();            }        }  Calendar.HOUR_OF_DAY Calendar.MINUTEtrue);        break;    }    return dialog;}

}

主要在这两句，
Intent intent=new Intent(MainActivity.thisAlarmReceiver.class);
PendingIntent pi=PendingIntent.getBroadcast(MainActivity.this0 intent 0);
am.set(AlarmManager.RTC_WAKEUPc.getTimeInMillis() pi);
不知道为什么有时候闹钟会好，现在彻底不行了。。

AlarmReceiver.java如下
public class AlarmReceiver extends BroadcastReceiver {

@Overridepublic void onReceive(Context context Intent intent) {    Intent i=new Intent(contextAlarmActivity.class);    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    context.startActivity(i);    MediaPlayer mp = new MediaPlayer();    try {        mp.setDataSource(context RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE));    } catch (IllegalArgumentException | SecurityException            | IllegalStateException | IOException e) {        e.printStackTrace();    }    try {        mp.prepare();    } catch (IllegalStateException | IOException e) {        e.printStackTrace();    }    mp.start();}   

}
求高手解答，菜鸟一枚。。