Android藍牙啓用

Question

我正在開發藍牙聊天應用程序。問題是，當我啓用藍牙應用程序啓用藍牙，但導致強制關閉。下一次我啓動相同的應用程序（啓用藍牙），它工作順利！我已經搜查，只得到了一些資料說，當我開始故意對啓用藍牙的代碼進行不等待意向的結果

 public void run() { 

     // 1. Check if Bluetooth is Enabled 
     if (!blue.isEnabled()) { 
      Intent enable_Bluetooth = new Intent(
        BluetoothAdapter.ACTION_REQUEST_ENABLE); 
      startActivityForResult(enable_Bluetooth, 1); 

     } 

     // 2. Start Bluetooth Server 
     try { 
      Server = blue.listenUsingRfcommWithServiceRecord("dhiraj", 
        MY_UUID); 

Answer 1

第一：

聲明藍牙權限（S）在你的應用清單文件。 例如：

<manifest ... > 
<uses-permission android:name="android.permission.BLUETOOTH" /> 
... 
</manifest> 

設置藍牙：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
if (mBluetoothAdapter == null) { 
// Device does not support Bluetooth 
} 

啓用藍牙：

if (!mBluetoothAdapter.isEnabled()) { 
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); 
} 

查找設備：

Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices(); 
// If there are paired devices 
if (pairedDevices.size() > 0) { 
// Loop through paired devices 
for (BluetoothDevice device : pairedDevices) { 
    // Add the name and address to an array adapter to show in a ListView 
    mArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 
} 
} 

發現設備：

// Create a BroadcastReceiver for ACTION_FOUND 
private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 
@Override 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 address to an array adapter to show in a ListView 
     mArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 
    } 
} 
}; 
// Register the BroadcastReceiver 
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy 

啓用發現

Intent discoverableIntent = new 
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); 
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); 
startActivity(discoverableIntent);