android - Android 上的蓝牙 : startDiscovery doesn't work and I have bluetooth enabled

Question

我在使用 startDiscovery() 时遇到问题。这是问题所在，我已经像这样向我的 BroadcastReceiver 注册了以下 Intents:

IntentFilter filterFound = new IntentFilter(BluetoothDevice.ACTION_FOUND);
IntentFilter filterStart = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
IntentFilter filterStop = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(myReceiver, filterFound);
registerReceiver(myReceiver, filterStart);
registerReceiver(myReceiver, filterStop);

这是我的广播接收器:

private BroadcastReceiver myReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
    Log.d(TAG, "onReceive (myReceiver)");
    String action = intent.getAction();
    // When discovery finds a device
    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
        // Get the BluetoothDevice object from the Intent
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        // Add the name and address to an array adapter to show in a ListView
        Log.d(TAG,device.getName() + " " + device.getAddress());
        deviceListAdapter.add(device.getName() + "\n" + device.getAddress());
    }
    if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
        Log.d(TAG, "Started discovery");
    }
    if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
        Log.d(TAG, "Finished discovery");
    }
}
};

当我在我的蓝牙适配器(蓝牙存在并启用)上调用 startDiscovery 时，没有任何反应，我在 logcat 中也看不到任何关于 BroadcastReceiver 的信息。

您是否遇到过此类问题？任何帮助表示赞赏:)

谢谢

Answer 1

确保您对 AndroidManifest.xml 拥有适当的权限.特别是，要执行发现，您需要 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> .