無法解析方法registerReceiver（android.content.BroadcastReceiver，android.content.IntentFilter）的片段類

Question

//here my code 
//used this IntentFilter 

IntentFilter filter = new IntentFilter(); 

filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); 
filter.addAction(BluetoothDevice.ACTION_FOUND); 
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 

//this method cannot be resolve 

registerReceiver(mReceiver, filter); 

Answer 1

你可以做，在片段：

getActivity().registerReceiver(receiver, filter); 

Answer 2

registerReceiver是Context類中找到的方法。 Fragment不會擴展它，但Activity會。這就是爲什麼你可以使用它像這樣：

registerReceiver.(receiver, filter); 

在活動，但你必須把它在上下文從尾數要麼是這樣的：

getActivity().registerReceiver(receiver, filter); 

甚至更​​好的onAttach

@Override 
public void onAttach(Context context) { 
     context.registerReceiver(receiver, filter); 
}