有没有监听系统时间变化的方法

有没有监听系统时间变化的方法

设置闹钟与获得当前时间，下面代码中都用
import java_text);
btn_set = (Button) findViewById(R.id.btn_set);
btn_close = (Button) findViewById(R.id.btn_close);

calendar = Calendar.getInstance();


btn_set.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//设置当前时间
calendar.setTimeInMillis(System.currentTimeMillis());
//获取小时
int hour = calendar.get(Calendar.HOUR_OF_DAY);
//获取分钟
int minute = calendar.get(Calendar.MINUTE);


new TimePickerDialog(MainActivity.this, new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
//设置当前时间
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);//设置小时
calendar.set(Calendar.MINUTE, minute); //设置分钟
calendar.set(Calendar.SECOND, 0); //设置秒数
calendar.set(Calendar.MILLISECOND, 0); //设置毫秒


Intent intent = new Intent(MainActivity.this, MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);


AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);

am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(10*1000), (24*60*60*1000), pendingIntent);

String tmps = "设置闹钟时间为"+format(hourOfDay)+":"+format(minute);

tv_text.setText(tmps);
}
}, hour, minute, true).show();
}
});


btn_close.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.cancel(pendingIntent);
tv_text.setText("闹钟已取消...");
}
});
}


private String format(int x){
String s=""+x;
if(s.length() ==1){
s="0"+s;
}
return s;
}
}

先在manifest里面注册一个广播接受者 然后在代码中实现你的逻辑： public class ****receiver extends broadcastreceiver { @override public void onreceive(context context, intent intent) { log.d("ok", "broadcast!"); } }