Question

我查看了许多教程并在线询问如何设置报警管理器以获取系统事件（在我的情况下是蓝牙发现）。但是，由于我还不知道的某些原因，我未能实现这一目标。

我的接收器类如下：

公共类MyBluetoothReceiver扩展了BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    Calendar call = Calendar.getInstance();
    call.setTimeInMillis(System.currentTimeMillis());
    Date date = call.getTime();

    Log.i("BlueTestm: ", "" + action);


    if(BluetoothDevice.ACTION_FOUND.equals(action)) 
    {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        Log.i("\nDevice: ",  device.getName() + ", " + device + ", T: " + date.toLocaleString() );
        String t1 = "\nDevice: "+  device.getName() + ", " + device + ", T: " + date.toLocaleString();

        Toast.makeText(context, t1, Toast.LENGTH_SHORT).show();


    } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) 
    {
        String t2 = "Discovery Started";
        Log.i("BlueTest: ", "" + t2);

        Toast.makeText(context, t2, Toast.LENGTH_SHORT).show();

    } else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) 
    {
        String t3 = "Discovery finished"; 
        Log.i("BlueTest: ", "" + t3);

        Toast.makeText(context, t3, Toast.LENGTH_SHORT).show();
    }   
}

}

我在我的主要活动上调用这个方法：

UPADTED：

public void startAlert() {
    int i = Integer.parseInt("15");
    IntentFilter filter;

    filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    filter.addAction(BluetoothDevice.ACTION_UUID);
    filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(blueReciver, filter);

    Intent intent = new Intent(this, MyBluetoothReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    long triggerAtTime = cal.getTimeInMillis()+ (i * 1000); // starts in 30 minutes
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (i * 1000), triggerAtTime, pendingIntent);

    //alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (i * 1000),  pendingIntent);
    Toast.makeText(this, "Alarm set in " + i + " seconds", Toast.LENGTH_LONG).show();
}

我在这里要做的是每隔15秒做一次蓝牙发现。在我更新了我的代码之后，现在警报工作正常但我的蓝牙接收器仅在第一次接收“动作”，然后每当警报触发接收器时，“动作”字符串在警报呼叫上返回null。根据我的理解，该应用程序没有从第二次扫描中进行任何发现。实际上，在第一次通话后它根本没有进行任何扫描。到目前为止，我试图找出为什么会发生这种情况。

任何帮助将不胜感激。谢谢。

我的蓝牙接收器仅从我的AlarmManager接收一次事件

0 个答案: