Comment ajouter le contenu dans ListView en utilisant ListView et ArrayAdapter?

Question

Je développe une application où je dois me connecter à un périphérique Bluetooth.

Lorsque je clique sur le btn_discover Button, il va appeler BroadcastReceiver et scanner le nouveau périphérique bluetooth et afficher sur le TextView. Lorsque j'utilise le TextView, je peux voir le périphérique bluetooth sur Textview. Je veux maintenant changer le TextView en ListView.

Mais il plante toujours. Lorsqu'en BroadcastReceiver « s onReceive(), j'écris:

newDevicelistArrayAdapter.add(device.getName()); 

Ceci est mon code Java:

package com.example.bttest; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Set; 

import com.example.bttest.R.menu; 

import android.os.Bundle; 
import android.app.Activity; 
import android.bluetooth.BluetoothAdapter; 
import android.bluetooth.BluetoothDevice; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class Main extends Activity { 


    public BluetoothAdapter mBluetoothAdapter; 
    private static final int REQUEST_SELECT_DEVICE = 1; 
    public Button btn_scan; 
    public Button btn_discover; 
    public TextView pair_list; 
    public TextView scan_list; 
    public ListView scan_list_1; 
    public Set<BluetoothDevice> pairedDevices; 
    public ArrayAdapter<String> newDevicelistArrayAdapter; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 


     btn_scan = (Button)findViewById(R.id.btn_scan); 
     btn_discover = (Button)findViewById(R.id.btn_discover); 
     pair_list = (TextView)findViewById(R.id.pair_list); 
     scan_list = (TextView)findViewById(R.id.scan_list); 


     newDevicelistArrayAdapter = new ArrayAdapter<String>(this, R.layout.main); 
     scan_list_1 = (ListView)findViewById(R.id.scan_list_1); 
     scan_list_1.setAdapter(newDevicelistArrayAdapter); 



     mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
     if (mBluetoothAdapter == null) 
     { 
      Toast.makeText(this, "No support bluetooth", Toast.LENGTH_SHORT).show(); 
      return; 
     }else if(mBluetoothAdapter != null)  { 
      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
      startActivityForResult(enableBtIntent, REQUEST_SELECT_DEVICE); 
     } 


     //******************scan按鈕動作-將已配對過的藍芽裝置列出來 
     btn_scan.setOnClickListener(new OnClickListener() {  
      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       pairedDevices = mBluetoothAdapter.getBondedDevices(); 
       if(pairedDevices.size()>0) { 
        for(BluetoothDevice bDevice : pairedDevices) { 
         pair_list.append(bDevice.getName() + "\n" + bDevice.getAddress() + "\n" + bDevice.getBondState() + "\n"); 
        } 
       } 
      } 
     }); 
     //******************scan按鈕動作結束 


     btn_discover.setOnClickListener(new OnClickListener() {  
      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
       registerReceiver(mReceiver, filter); 
       filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 
       registerReceiver(mReceiver, filter); 
       mBluetoothAdapter.startDiscovery(); 

      } 
     }); 




    } 





    private final BroadcastReceiver mReceiver = 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); 
       scan_list.append(device.getName() + "\n" + device.getAddress() + "\n"); 
       newDevicelistArrayAdapter.add(device.getName()); 

      } 
     } 
    }; 

    protected void onDestroy() { 

     super.onDestroy(); 
     if (mBluetoothAdapter != null) { 
      mBluetoothAdapter.cancelDiscovery(); 
     } 
     unregisterReceiver(mReceiver); 
    } 




    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

-t-il tout mal quand j'utilise le ListView et ArrayAdapter?

Answer 1

Remplacer le onReceive() de votre BroadcastReceiver avec ceci:

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); 
     scan_list.append(device.getName() + "\n" + device.getAddress() + "\n"); 
     newDevicelistArrayAdapter.notifyDataSetChanged(); 
    } 
}