Question

我的应用正在尝试同时连接蓝牙模块和发送/接收数据。但有时会抛出以下错误（通常在GC调用之后发生）： -

12-15 19:06:15.559: D/dalvikvm(22875): GC_FOR_ALLOC freed 3925K, 25% free 11400K/15096K, paused 28ms, total 28ms    
12-15 19:06:15.559: E/System(22875): Uncaught exception thrown by finalizer 
12-15 19:06:15.559: E/System(22875): java.io.IOException: socket not created    
12-15 19:06:15.559: E/System(22875):    at android.net.LocalSocketImpl.shutdownInput(LocalSocketImpl.java:392)
12-15 19:06:15.559: E/System(22875):    at android.net.LocalSocket.shutdownInput(LocalSocket.java:206)
12-15 19:06:15.559: E/System(22875):    at android.bluetooth.BluetoothSocket.close(BluetoothSocket.java:462)
12-15 19:06:15.559: E/System(22875):    at android.bluetooth.BluetoothSocket.finalize(BluetoothSocket.java:229)
12-15 19:06:15.559: E/System(22875):    at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:187)
12-15 19:06:15.559: E/System(22875):    at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:170)
12-15 19:06:15.559: E/System(22875):    at java.lang.Thread.run(Thread.java:841)

这个未被捕获的异常会反复抛出几次，因此我的应用程序停止响应。

出现此错误的可能原因是什么？我试图解决它，但找不到确切的问题。请帮忙。

我还附上了我用来连接蓝牙模块的代码。我正在使用AsyncTask来执行此操作..

    //global variable
    BluetoothSocket mBSocket;

    // inside doInBackground() function
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (mBluetoothAdapter.isEnabled()) {
        try {
            for (BluetoothDevice bt : mBluetoothAdapter.getBondedDevices()) {
                if (bt.getName().equalsIgnoreCase("MY_DEVICE_BT_NAME")) {
                    BluetoothDevice device = mBluetoothAdapter
                            .getRemoteDevice(bt.getAddress());
                    mBluetoothAdapter.cancelDiscovery(); // We have named our
                                                            // device so
                                                            // cancel search
                    mBSocket = device
                            .createRfcommSocketToServiceRecord(SPP_UUID);
                    if(!mBSocket.isConnected()) {
                        mBSocket.connect();
                    }
                    return mBSocket;
                }
            }
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        } 
    } else
        return null;

Answer 1

我已修改代码以连接到我的蓝牙模块，正确处理异常，因为我没有遇到任何此类错误，正如我在问题中所描述的那样。

//global variable
BluetoothSocket mBSocket;

// inside doInBackground() function
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter.isEnabled()) {
    try {
        for(BluetoothDevice bt: mBluetoothAdapter.getBondedDevices()) {
            if(bt.getName().equalsIgnoreCase(params[0])) {
                BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(bt.getAddress());
                mBluetoothAdapter.cancelDiscovery();

                mBSocket = device.createRfcommSocketToServiceRecord(SPP_UUID);
                mBSocket.connect();
                return mBSocket;
            }
        }
    } catch(IOException e) {
        if(mBSocket != null) {
            try {
                mBSocket.close();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
            mBSocket = null;
        }
        e.printStackTrace();
        return null;
    }
} 
return null;

Android蓝牙套接字未创建

1 个答案: