当我尝试通过从配对设备列表中选择蓝牙设备来建立连接时，应用程序崩溃并返回主要活动。
PairingList.java
public class PairingList extends Activity implements AdapterView.OnItemClickListener {
private static final int SUCCESS_CONNECT = 0;
private static final int MESSAGE_READ = 1;
ListView lview;
String[] paires;
ArrayAdapter<String> adapter;
Set<BluetoothDevice> devicesarray;
BluetoothAdapter mBluetoothAdapter;
ArrayList<BluetoothDevice> devices;
public BluetoothSocket socket;
public final UUID MY_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg)
{
super.handleMessage(msg);
switch (msg.what){
case SUCCESS_CONNECT:
ConnectedThread connectedThread=new ConnectedThread((BluetoothSocket) msg.obj);
String s="Successfully Connected";
connectedThread.write(s.getBytes());
break;
case MESSAGE_READ:
byte[] readBuf=(byte[])msg.obj;
String s1=new String(readBuf);
Toast.makeText(getBaseContext(),"Connect",Toast.LENGTH_SHORT).show();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pairinglist_layout);
lview= (ListView) findViewById(R.id.listviewid);
mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
Bundle bn1=getIntent().getExtras();
paires=bn1.getStringArray("paires");
adapter= new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,paires);
lview.setAdapter(adapter);
lview.setOnItemClickListener(this);
devices=new ArrayList<BluetoothDevice>();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_pairinglist_layout, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
BluetoothDevice selectedDevice=devices.get(position);
ConnectThread connect=new ConnectThread(selectedDevice);
connect.start();
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
// Use a temporary object that is later assigned to mmSocket,because mmSocket is final
BluetoothSocket tmp = null;
mmDevice = device;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
// MY_UUID is the app's UUID string, also used by the server code
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
mBluetoothAdapter.cancelDiscovery(); // Cancel discovery because it will slow down the connection
try {
// Connect the device through the socket. This will block until it succeeds or throws an exception
mmSocket.connect();
} catch (IOException connectException) {
// 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) { }
}
}
}
调用此方法时，应用程序崩溃：
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
BluetoothDevice selectedDevice=devices.get(position);
ConnectThread connect=new ConnectThread(selectedDevice);
connect.start();
}
我甚至试图在其中放入一个祝酒词，但它没有被执行。