无法弄清楚如何创建响铃警报的取消按钮

Question

即使我按下了停止警报按钮，我仍然无法阻止闹钟响起。我不知道如何访问同一个 Ringtone 实例并调用 stop()。

这是我在MainActivity中的启动闹钟开关javaclass.

public void switchClicked(View view) {
    if (((Switch) view).isChecked()) {
        Log.d("MainActivity", "Alarm On");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, alarmTimePicker.getHour());
        calendar.set(Calendar.MINUTE, alarmTimePicker.getMinute());
        Intent myIntent = new Intent(MainActivity.this, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, 0);
        alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);
        setAlarmText("ON");


    } else {
        alarmManager.cancel(pendingIntent);
        setAlarmText("OFF");
        Log.d("MainActivity", "Alarm Off");
    }
}

public void setAlarmText(String alarmText) {
    alarmTextView.setText(alarmText);
}

这是我在 MainActivity 中的 StopAlarm 按钮 java class。

public void stopAlarm(View view) {
        setAlarmText("Alarm stopped");
        Intent myIntent = new Intent(MainActivity.this, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager.cancel(pendingIntent);
    }

这是 AlarmReciver java class。

public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {

    MainActivity inst = MainActivity.instance();
    inst.setAlarmText("Alarm! Wake up! Wake up!");
    Uri alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
    if (alarmUri == null) {
        alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    }
    Ringtone ringtone = RingtoneManager.getRingtone(context, alarmUri);
    ringtone.play();
}
}

Answer 1

步数：

将 RingtonePlayingService 添加到您的项目中（不要忘记在清单中声明它）

public class RingtonePlayingService extends Service{

    private Ringtone ringtone = null;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
        Uri alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        if (alarmUri == null) 
            alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        this.ringtone = RingtoneManager.getRingtone(this, alarmUri);
        ringtone.play();

        return START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent){
        return null;
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        shutUpRingtone();
    }

    private void shutUpRingtone(){
        if(ringtone != null)
            ringtone.stop();
        ringtone = null;
    }
}

删除您在 onReceive 中的代码并放入：

@Override
public void onReceive(final Context context, Intent intent) {
    Intent startIntent = new Intent(context, RingtonePlayingService.class);
    context.startService(startIntent);
}

现在 RingtonePlayingService 正在处理铃声播放并保持对它的引用。您的 stopAlarm 方法只是取消潜在的未决警报，因此如果它在单击停止按钮之前尚未触发，则它永远不会触发。但是当它已经开始响铃时，您应该停止启动服务持有的 ringtone 实例。在您的方法末尾添加：

public void stopAlarm(View view) {
    ...
    Intent stopIntent = new Intent(context, RingtonePlayingService.class);
    stopService(stopIntent);
}

现在stopAlarm两者都做：取消挂起的警报（如果有）和停止服务（如果还活着），这可能正在播放铃声

也删除 MainActivity.instance() 模式，这太糟糕了......当你设置未来警报（例如现在+1h）并且系统（或用户）在它被触发之前从内存中删除应用程序然后你会获取 NullPointerException，因为 .instance() 是 null，并且您立即尝试访问 inst.setAlarmText 方法。相反，您可以使用 Local Broadcasting or service binding 来更新您的 UI - 将 broadcasts/messages 从工作状态 RingtonePlayingService 发送到您的 Activity，状态 start/stop/current

无法弄清楚如何创建响铃警报的取消按钮

Cannot figure out how to create the cancel button for ringing alarm

java

android

alarm

android-intent

android-alarms