我成功启用了蓝牙并显示了附近设备的列表，但只要我点击列表中显示的设备，app就会关闭。无法弄清问题是什么，如果有人回答这个问题会很有帮助
package com.android.clickandsend;
import java.io.IOException;
import java.util.Set;
import java.util.UUID;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class Bluetooth extends Activity{
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
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 the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() );
BTArrayAdapter.notifyDataSetChanged();
}
}
};
private static final int REQUEST_ENABLE_BT = 1;
public static BluetoothAdapter myBluetoothAdapter;
private ListView myListView;
public final static UUID my_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
private ArrayAdapter<String> BTArrayAdapter;
private Set<BluetoothDevice> pairedDevices;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.bluetooth);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Button b=(Button)findViewById(R.id.button1);
if(myBluetoothAdapter == null){
Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
finish();
}
else {
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
myListView=(ListView)findViewById(R.id.listView1);
BTArrayAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
myListView.setAdapter(BTArrayAdapter);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
myBluetoothAdapter.cancelDiscovery();
Toast.makeText(getApplicationContext(), "cancel dis", Toast.LENGTH_SHORT).show();
}
else {
BTArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
Toast.makeText(getApplicationContext(), "start dis", Toast.LENGTH_SHORT).show();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
myListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
String itemValue = (String) myListView.getItemAtPosition(position);
String MAC = itemValue.substring(itemValue.length() - 17);
BluetoothDevice bluetoothDevice = myBluetoothAdapter.getRemoteDevice(MAC);
ConnectingThread t = new ConnectingThread(bluetoothDevice);
t.start();
}
});
}
});
Button c=(Button)findViewById(R.id.button2);
c.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ListeningThread t = new ListeningThread();
t.start();
}
});
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(bReceiver);
}
}
class ConnectingThread extends Thread {
private final BluetoothSocket bluetoothSocket;
private final BluetoothDevice bluetoothDevice;
public ConnectingThread(BluetoothDevice device) {
BluetoothSocket temp = null;
bluetoothDevice = device;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
temp = bluetoothDevice.createRfcommSocketToServiceRecord(Bluetooth.my_UUID);
} catch (IOException e) {
e.printStackTrace();
}
bluetoothSocket = temp;
}
public void run() {
Bluetooth.myBluetoothAdapter.cancelDiscovery();
// Cancel any discovery as it will slow down the connection
try {
// This will block until it succeeds in connecting to the device
// through the bluetoothSocket or throws an exception
bluetoothSocket.connect();
} catch (IOException connectException) {
connectException.printStackTrace();
try {
bluetoothSocket.close();
} catch (IOException closeException) {
closeException.printStackTrace();
}
}
// Code to manage the connection in a separate thread
/*
manageBluetoothConnection(bluetoothSocket);
*/
}
// Cancel an open connection and terminate the thread
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ListeningThread extends Thread {
private final BluetoothServerSocket bluetoothServerSocket;
private final static UUID uuid = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
String name="help";
public ListeningThread() {
BluetoothServerSocket temp = null;
try {
temp = Bluetooth.myBluetoothAdapter.listenUsingRfcommWithServiceRecord(name, uuid);
} catch (IOException e) {
e.printStackTrace();
}
bluetoothServerSocket = temp;
}
public void run() {
BluetoothSocket bluetoothSocket;
// This will block while listening until a BluetoothSocket is returned
// or an exception occurs
while (true) {
try {
bluetoothSocket = bluetoothServerSocket.accept();
} catch (IOException e) {
break;
}
// If a connection is accepted
if (bluetoothSocket != null) {
Toast.makeText(getApplicationContext(), "A connection has been accepted.",
Toast.LENGTH_SHORT).show();
break;
}
// Manage the connection in a separate thread
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
private Context getApplicationContext() {
// TODO Auto-generated method stub
return null;
}
// Cancel the listening socket and terminate the thread
public void cancel() {
try {
bluetoothServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
只需用下面的代码替换你的run（），问题就像当你试图连接可能已经与某些外围设备连接的特定设备，所以你必须先断开它。如果你有任何问题，请告诉我面对。
try {
bluetoothSocket.close();
bluetoothSocket.disconnect();
bluetoothSocket.connect();
} catch (IOException connectException) {
connectException.printStackTrace();
try {
bluetoothSocket.close();
} catch (IOException closeException) {
closeException.printStackTrace();
}
}