蓝牙An​​droid的RSSI值返回-32768始终？ [英] Android RSSI value of Bluetooth returns -32768 always?

问题描述

我想在点击按钮来获得一个连接的蓝牙设备的当前RSSI值。然而，它仅返回-32768永远！不知道什么是错的！不过，我能得到正确的RSSI，第一次它得到了连接。

I am trying to get the current RSSI value of a connected bluetooth device at the click of a button. However it returns only -32768 always! Don't know what is wrong! However I was able to get the correct RSSI, the first time it got connected.

private Button.OnClickListener buttonRSSIOnClickListener = new Button.OnClickListener(){
  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   Intent intent = new Intent(BluetoothDevice.ACTION_FOUND);
   short rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
   Toast.makeText(getApplicationContext(),"  RSSI: " + rssi + "dBm", Toast.LENGTH_SHORT).show();

  }};

谁能帮我吗？

推荐答案

这是不是你如何使用意向。你得到-32768因为RSSI是不是在您刚刚创建的意图，并且已指定默认的结果是Short.MIN_VALUE（-32768）。

This isn't how you use an Intent. You are getting -32768 because the RSSI isn't in that Intent that you just created, and the default result you have specified is Short.MIN_VALUE (-32768).

您需要继承广播接收器，并创建一个IntentFilter的（或使用清单），以使您获得BluetoothDevice.ACTION_FOUND意图。

You need to subclass BroadcastReceiver, and create an IntentFilter (or use the manifest) to so that you receive the BluetoothDevice.ACTION_FOUND intent.

您将无法做到这一点在点击按钮。你只把它当Android的生成ACTION_FOUND。

You won't be able to do this "at the click of a button." You'll only get it when Android generates the ACTION_FOUND.

下面是一些接近。没有运行它自己。

Here is something close. Haven't run it myself.

在的onCreate（）：

In onCreate():

registerReceiver(receiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));

在别处：

private final BroadcastReceiver receiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();
        if(BluetoothDevice.ACTION_FOUND.equals(action)) {
            short rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
            Toast.makeText(getApplicationContext(),"  RSSI: " + rssi + "dBm", Toast.LENGTH_SHORT).show();
        }
    }
};

编辑：其实，如果你在你的BluetoothAdapter从内部的onClick调用startDiscovery（）你也许可以做到这一点点播（）。这应该引起ACTION_FOUND每个它发现的设备。

Actually you might be able to do it on-demand if you call startDiscovery() on your BluetoothAdapter from within onClick(). That should trigger ACTION_FOUND for each device it discovers.

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