Android上的蓝牙：startDiscovery不起作用，我启用了蓝牙

问题描述：

我遇到了使用startDiscovery（）的麻烦。这是问题所在，我已经注册了以下意图，以我的广播接收器是这样的：Android上的蓝牙：startDiscovery不起作用，我启用了蓝牙

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);

这里是我的广播接收器：

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"); 
    } 
} 
};

当我打电话startDiscovery我的蓝牙适配器（蓝牙现有和已启用），没有任何反应，我也看不到有关BroadcastReceiver的logcat中的任何内容。

您是否已经遇到过这种问题？任何帮助表示赞赏:)

感谢

答

确保你有你的AndroidManifest.xml相应的权限。特别是，要执行发现，您需要<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />。

答

正如Brad Hein所说，确保AndroidManifest具有蓝牙许可。

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> 
    <uses-permission android:name="android.permission.BLUETOOTH" />

对于注册蓝牙扫描结果广播接收机请按照以下方法。

IntentFilter bluetoothFilter = new IntentFilter(); 
bluetoothFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
bluetoothFilter.addAction(BluetoothDevice.ACTION_FOUND); 
bluetoothFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 

registerReceiver(myReceiver, bluetoothFilter);

开始蓝牙发现如下。

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 

if (bluetoothAdapter == null) { 
    // No bluetooth Hardware found. 
} 
if (!bluetoothAdapter.isEnabled()) { 
    // Bluetooth is OFF 
} 

if (bluetoothAdapter.isDiscovering()) { 
    // cancel the discovery if it has already started 
    bluetoothAdapter.cancelDiscovery(); 
} 

if (bluetoothAdapter.startDiscovery()) { 
    // bluetooth has started discovery 
}

答

试图声明接收器如下：

private class SingBroadcastReceiver extends BroadcastReceiver { 
    public void onReceive(Context context, Intent intent) { 
     String action = intent.getAction(); 

     if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_STARTED)) { 
      log(getTimeStamp() + ":discovery started"); 
     }

这里是在功能所需要的顺序调用：

1- cancelDiscovery（）+ getAdapter（）

2-启动接收器如下：

 mReceiver = new SingBroadcastReceiver(); 

     IntentFilter ifilter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
     ifilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 
     ifilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
     this.registerReceiver(mReceiver, ifilter);

3- startDiscovery（）

Android上的蓝牙：startDiscovery不起作用，我启用了蓝牙

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