ACTION_DISCOVERY_STARTED从来没有所谓的Android

Question

我有下面的代码：

public class AddPrinter extends ListActivity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    bluetoothAdapter.startDiscovery(); 
    filter = new IntentFilter(); 
    filter.addAction(BluetoothDevice.ACTION_FOUND); 
    filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
    filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 
    registerReceiver(receiver, filter); 
} 

BroadcastReceiver receiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     String action = intent.getAction(); 
     System.out.println(action); 
     if (BluetoothDevice.ACTION_FOUND.equals(action)) { 
      BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
      adapter.add(device); 
     } 
     else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(intent.getAction())) { 
      System.out.println("STARTED"); 
     } 
     else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(intent.getAction())) { 
      Utils.dialog.dismiss(); 
     } 
    } 
}; 

我的问题是如此怪异，由于某种原因，ACTION_DISCOVERY_STARTED永远不会被调用，但所有其他操作都很好，我失去了什么？感谢您的时间。

Answer 1

试试这个

public class AddPrinter extends ListActivity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

      filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
      registerReceiver(receiver, filter); 
      filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
      registerReceiver(receiver, filter); 
      filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 
      registerReceiver(receiver, filter); 

      // 
      bluetoothAdapter.startDiscovery(); 

} 

把bluetoothAdapter.startDiscovery();注册recevier