getActivity（）與適配器不兼容

Question

這是我的代碼。 在itemClickListener的部分中，我有一個適配器的調用，但是我想它需要另一個參數，問題是我不知道它是什么

 public class Lista_Activity extends Activity implements OnItemClickListener { ArrayAdapter<String> listAdapter; ListView listView; BluetoothAdapter btAdapter; Set<BluetoothDevice> devicesArray; ArrayList<String> pairedDevices; ArrayList<BluetoothDevice> devices; public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); protected static final int SUCCESS_CONNECT = 0; protected static final int MESSAGE_READ = 1; IntentFilter filter; BroadcastReceiver receiver; String tag = "debugging"; Handler mHandler = new Handler(){ @Override public void handleMessage(Message msg){ // TODO Auto-generated method stub Log.i(tag, "in handler"); super.handleMessage(msg); switch(msg.what){ case SUCCESS_CONNECT: // DO something ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj); Toast.makeText(getApplicationContext(), "CONECTADO", 0).show(); String s = "Conexion realizada"; connectedThread.write(s.getBytes()); Log.i(tag, "Conectado"); break; case MESSAGE_READ: byte[] readBuf = (byte[])msg.obj; String string = new String(readBuf); Toast.makeText(getApplicationContext(), string, 0).show(); break; } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.lista); init(); if(btAdapter==null){ Toast.makeText(getApplicationContext(), "No se detectan dispositivos Bluetooth", 0).show(); finish(); } else{ if(!btAdapter.isEnabled()){ turnOnBT(); } getPairedDevices(); startDiscovery(); } } private void startDiscovery() { // TODO Auto-generated method stub btAdapter.cancelDiscovery(); btAdapter.startDiscovery(); } private void turnOnBT() { // TODO Auto-generated method stub Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(intent, 1); } private void getPairedDevices() { //AGREGAMOS LOS DISPOSITIVOS CERCANOS A LA LISTA // TODO Auto-generated method stub devicesArray = btAdapter.getBondedDevices(); if(devicesArray.size()>0){ for(BluetoothDevice device:devicesArray){ pairedDevices.add(device.getName()); } } } private void init() { // TODO Auto-generated method stub listView=(ListView)findViewById(R.id.listView); listView.setOnItemClickListener(this); listAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,0); listView.setAdapter(listAdapter); btAdapter = BluetoothAdapter.getDefaultAdapter(); pairedDevices = new ArrayList<String>(); filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); devices = new ArrayList<BluetoothDevice>(); receiver = new BroadcastReceiver(){ @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub String action = intent.getAction(); if(BluetoothDevice.ACTION_FOUND.equals(action)){ BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); devices.add(device); String s = ""; for(int a = 0; a < pairedDevices.size(); a++){ if(device.getName().equals(pairedDevices.get(a))){ //append s = "(Agregado)"; break; } } listAdapter.add(device.getName()+s+"\\n"+"Dirección MAC: ("+device.getAddress()+")"); } else if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){ // run some code } else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){ // run some code } else if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){ if(btAdapter.getState() == btAdapter.STATE_OFF){ turnOnBT(); } } } }; registerReceiver(receiver, filter); filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED); registerReceiver(receiver, filter); filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); registerReceiver(receiver, filter); filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); registerReceiver(receiver, filter); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); unregisterReceiver(receiver); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if(resultCode == RESULT_CANCELED){ Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show(); finish(); } } private void cargarLista(){ Adapter_lista adapter = new Adapter_lista(getActivity()); listView.setAdapter(adapter); listView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub if(btAdapter.isDiscovering()){ btAdapter.cancelDiscovery(); } if(listAdapter.getItem(arg2).contains("Agregado")){ BluetoothDevice selectedDevice = devices.get(arg2); ConnectThread connect = new ConnectThread(selectedDevice); connect.start(); Log.i(tag, "in click listener"); } else{ BluetoothDevice selectedDevice = devices.get(arg2); ConnectThread connect = new ConnectThread(selectedDevice); connect.start(); Log.i(tag, "in click listener"); Toast.makeText(getApplicationContext(), "Agregando dispositivo...", 0).show(); } } }); } private class ConnectThread extends Thread { private final BluetoothSocket mmSocket; private final BluetoothDevice mmDevice; public ConnectThread(BluetoothDevice device) { // Usa un objeto temporal que despues se asigna a mmSocket, BluetoothSocket tmp = null; mmDevice = device; Log.i(tag, "construct"); // Get a BluetoothSocket to connect with the given BluetoothDevice try { // MY_UUID es el UUID string de la app, tambien usado por el server code tmp = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (IOException e) { Log.i(tag, "get socket failed"); } mmSocket = tmp; } public void run() { // Cancel discovery because it will slow down the connection btAdapter.cancelDiscovery(); Log.i(tag, "connect - run"); try { // Connect the device through the socket. This will block // until it succeeds or throws an exception mmSocket.connect(); Log.i(tag, "connect - succeeded"); } catch (IOException connectException) { Log.i(tag, "connect failed"); // Unable to connect; close the socket and get out try { mmSocket.close(); } catch (IOException closeException) { } return; } // Do work to manage the connection (in a separate thread) mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget(); } /** Will cancel an in-progress connection, and close the socket */ public void cancel() { try { mmSocket.close(); } catch (IOException e) { } } } private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream; public ConnectedThread(BluetoothSocket socket) { mmSocket = socket; InputStream tmpIn = null; OutputStream tmpOut = null; // Get the input and output streams, using temp objects because // member streams are final try { tmpIn = socket.getInputStream(); tmpOut = socket.getOutputStream(); } catch (IOException e) { } mmInStream = tmpIn; mmOutStream = tmpOut; } public void run() { byte[] buffer; // buffer store for the stream int bytes; // bytes returned from read() // Keep listening to the InputStream until an exception occurs while (true) { try { // Read from the InputStream buffer = new byte[1024]; bytes = mmInStream.read(buffer); // Send the obtained bytes to the UI activity mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer) .sendToTarget(); } catch (IOException e) { break; } } } /* Call this from the main activity to send data to the remote device */ public void write(byte[] bytes) { try { mmOutStream.write(bytes); } catch (IOException e) { } } /* Call this from the main activity to shutdown the connection */ public void cancel() { try { mmSocket.close(); } catch (IOException e) { } } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub } } 

這行是Adapter_lista適配器...

Answer 1

我認為錯誤在於

Adapter_lista adapter = new Adapter_lista(getActivity());

更改為

Adapter_lista adapter = new Adapter_lista(Lista_Activity.this);

希望它能解決您的問題。 另外，請檢查您的適配器構造函數及其參數。

Answer 2

將getActivity（）更改為Lista_Activity.this

在片段中使用了getActivity（）