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POwhy TextView can't show any data from the serial bluetooth?
 

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  1. POwhy TextView can't show any data from the serial bluetooth?
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    <p>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 dont know what's wrong.</p> <p>this is the code when application listens the inputstream while connected:</p> <pre><code>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; } } } </code></pre> <p>and <code>TextView mTextView = (TextView) findViewById(R.id.dataTerm);</code> and on the layout:</p> <pre><code>&lt;TextView android:id="@+id/dataTerm" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; </code></pre> <p>So does anyone know what went wrong? Any answers are so helpful,thanks..</p> <p><strong>The code that finally work</strong> 1. On the main file, in my case named FinalSetting: On the Activity method, declare:</p> <pre><code>//Layout View private static TextView mTextView; </code></pre> <p>On the onCreate(Bundle savedInstanceState) method declare the textview:</p> <pre><code> mTextView = (TextView) findViewById(R.id.dataTerm); </code></pre> <p>On the Handler method:</p> <pre><code>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; </code></pre> <ol> <li><p>On the BluetoothService.java file: Let's just straight to the method </p> <p>//This thread runs during a connection with a remote device. //It handles all incoming and outgoing transmissions.</p> <p>private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream;</p> <p>public ConnectedThread(BluetoothSocket socket) { Log.d(TAG, "create ConnectedThread"); mmSocket = socket; InputStream tmpIn = null; OutputStream tmpOut = null;</p> <pre><code> // 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); } } } </code></pre></li> </ol> <p>After you connect to the serial bluetooth device, the data will show up on the TextView. Hope this help :D</p>
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