Question

I need to show data to a TextView from a serial Bluetooth. But when i connect my application with the serial device, it did connected but suddenly went forced closed. The logcat shows nothing so I don t know what s wrong.

这是在申请聆听<条码>输入<>/代码>时使用的代码。

public void run() {
    Log.i(TAG, "BEGIN mConnectedThread");
    byte[] buffer = new byte[1024];
    int bytes;

    while (true) {
        try {

            // Read from the InputStream
            bytes = mmInStream.read(buffer);

            //mEmulatorView.write(buffer, bytes);

            mTextView.append(new String(buffer));
            // Send the obtained bytes to the UI Activity
            //mHandler.obtainMessage(BlueTerm.MESSAGE_READ, bytes, -1, buffer).sendToTarget();

            String a = buffer.toString();
            mTextView.setText(a);
            a = "";
        } catch (IOException e) {
            Log.e(TAG, "disconnected", e);
            connectionLost();
            break;
        }
    }
}

and TextView mTextView = (TextView) findViewById(R.id.dataTerm);
and on the layout:

<TextView
    android:id="@+id/dataTerm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

So does anyone know what went wrong? Any answers are so helpful, thanks..

www.un.org/spanish/ecosoc 最后运作的法典

On the main file, in my case named FinalSetting:
On the Activity method, declare:

//Layout View   
private static TextView mTextView;

On the onCreate(Bundle savedInstanceState) method declare the textview:

mTextView = (TextView) findViewById(R.id.dataTerm);

在<代码>Handler上:

case MESSAGE_READ:
    byte[] readBuf = (byte[]) msg.obj;              
    //mEmulatorView.write(readBuf, msg.arg1);
    // construct a string from the valid bytes in the buffer
    String readMessage = new String(readBuf, 0, msg.arg1);
    //mConversationArrayAdapter.add(mConnectedDeviceName+":  " + readMessage);
    mTextView.setText(readMessage);
    break;

On the BluetoothService.java file:
Let s just straight to the method

//This thread runs during a connection with a remote device.
//It handles all incoming and outgoing transmissions.

private class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        Log.d(TAG, "create ConnectedThread");
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the BluetoothSocket input and output streams
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) {
            Log.e(TAG, "temp sockets not created", e);
        }
        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        Log.i(TAG, "BEGIN mConnectedThread");
        byte[] buffer = new byte[1024];
        //final byte[] buffer = new byte[1024];
        int bytes;

        // Keep listening to the InputStream while connected
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);

                //Send the obtained bytes to the UI Activity
                mHandler.obtainMessage(FinalSetting.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
            } catch (IOException e) {
                Log.e(TAG, "disconnected", e);
                connectionLost();
                break;
            }
        }
    }

    /**
    * Write to the connected OutStream.
    * @param buffer  The bytes to write
    */
    public void write(byte[] buffer) {
        try {
            mmOutStream.write(buffer);

            // Share the sent message back to the UI Activity
            mHandler.obtainMessage(FinalSetting.MESSAGE_WRITE, buffer.length, -1, buffer).sendToTarget();
        } catch (IOException e) {
            Log.e(TAG, "Exception during write", e);
        }
    }

    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) {
            Log.e(TAG, "close() of connect socket failed", e);
        }
    }    
}

After you connect to the serial Bluetooth device, the data will show up on the TextView. Hope this help :D

Answer 1

你们喜欢的种子试图在非倡议的版面上修改m Text ,这种读物是非法的,并且可能是促进委员会的原因(如果不是任何其他问题)。然而,你可以做到如下:

Change this:

mTextView.append(new String(buffer));

为此:

mTextView.post(new Runnable() {
    @Override
    public void run() {
        mTextView.append(new String(buffer));
    }
});

友情链接