重启后设置闹钟

Question

我有以下课程用于在每天的特定时间设置闹钟：

public class MainActivity extends Activity {
    private AlarmManager alarmMgr;
    private PendingIntent alarmIntent;
    BroadcastReceiver br;
    TextView t; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setup(); 
        t = (TextView)findViewById(R.id.textView1);
        // Set the alarm to start at approximately 2:00 p.m.
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 18);
        calendar.set(Calendar.MINUTE, 10); // Particular minute
        calendar.set(Calendar.SECOND, 0);
         alarmMgr = (AlarmManager)getApplicationContext().getSystemService(Context.ALARM_SERVICE);
         alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                    1000*60*60*24, alarmIntent);
    }


    public void setup() {
        br = new BroadcastReceiver() {
            @Override
            public void onReceive(Context c, Intent i) {
                Toast.makeText(c, "Rise and Shine!", Toast.LENGTH_LONG).show();
                //Invoke the service here Put the wake lock and initiate bind service
                t.setText("Hello Alarm set");
            }
        };
        registerReceiver(br, new IntentFilter("com.testrtc") );
        alarmIntent = PendingIntent.getBroadcast( this, 0, new Intent("com.testrtc"),
                0 );
        alarmMgr = (AlarmManager)(this.getSystemService( Context.ALARM_SERVICE ));
    }
   }

以上工作正常，但是要在重启后再次设置警报，我使用以下内容：

public class SampleBootReceiver extends BroadcastReceiver {
    private AlarmManager alarmMgr;
    private PendingIntent alarmIntent;
    BroadcastReceiver br;
    TextView t; 

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            Toast.makeText(context, "Hello from Bootloader", 10000).show();
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 18);
            calendar.set(Calendar.MINUTE, 10); // Particular minute
            calendar.set(Calendar.SECOND, 0);
             alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
             alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                        1000*60*60*24, alarmIntent);


        }
    }
}

我得到了祝酒词，但闹钟没有重置。否则我会得到原始的吐司消息（在MainActivity 的onRecieve 中设置），我做得对还是有更多？

Answer 1

你的代码是 100% 正确的，但问题出在下面一行，

calendar.set(Calendar.HOUR_OF_DAY, 18);

这将允许在下次执行时执行警报。这意味着明天的 18:00 PM。相反，如果你使用它，

calendar.set(Calendar.HOUR, 18);

那么它将在今天晚上 18:00 执行。