Pass String from thread to UI for display - multithreading

Question

I am new to android and java programming. I am try to write a program to read data via bluetooth.
I trying to pass a String apple which I decipher from my bluetooth input data from my thread to my UI for display CalibrationActivity.
I am using handler for the passing.
I keep getting force quit. Can anyone please advice me how can I solve this problem.
Below is my entire code of my extend Thread.
package com.android.backend.data.bluetooth;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.android.AutoActivity;
import com.android.CalibrationActivity;
import com.android.ui.UIManager;
public class Connection extends Thread {
final Connection tt = this;
private final String TAG = "Connection"; // Class name for logging
public boolean connected = false;
public BluetoothSocket bSocket = null;
public InputStream mmInStream = null;
public OutputStream mmOutStream = null;
public ArrayList<String> message = new ArrayList<String>();
public BluetoothDevice currentDevice = null;
public UIManager mgr;
public boolean connectFailure = false;
public boolean stopAutoConnect = false;
public String type = null;
public AutoActivity ff;
public void bsocketcancel() {
try {
bSocket.close();
} catch (IOException e) { }
}
public Connection(UIManager mgr, BluetoothDevice device, String message,
String type) {
this.mgr = mgr;
currentDevice = device;
this.message.add(message);
this.type = type;
}
public Connection(UIManager mgr, BluetoothDevice device, ArrayList<String> message,
String type) {
this.mgr = mgr;
currentDevice = device;
this.message = message;
this.type = type;
}
#Override
public void run() {
if (type.compareToIgnoreCase("Manual") == 0) {
Log.d("thread", "manual");
if (!connected)
connect(currentDevice);
if (bSocket != null){
for(String msg : message)
write(msg.getBytes());
}
mgr.hideConnectingProgressBox();
if(connected){
mgr.connectedDialog();
System.out.println("Maunal connected");
}
Log.d("thread", "hideprogressBox");
if (!connected)
mgr.showConnectionErrBox();
}
if (type.compareToIgnoreCase("auto") == 0){
Log.d("thread", "auto");
stopConnection();
int i = 0;
while (true) { //Set to 5 second
if (!connected)
connect(currentDevice);
if (bSocket != null){
for(String msg : message)
write(msg.getBytes());
}
mgr.hideConnectingProgressBox();
Log.d("thread", "hideprogressBox");
if (!connected) {
mgr.connecting();
}
if (connected) {
mgr.connectedDialog();
bsocketcancel();
System.out.println("Auto connected");
//BluetoothManager.getInstance().disconnectAll(); // cut all connection after transmit
break;
}
if(stopAutoConnect){
mgr.cancelconnecting();
break;
}
}
}
if (type.compareToIgnoreCase("calibrate") == 0) {
Log.d("thread", "calibrate");
if (!connected)
connect(currentDevice);
if (bSocket != null){
for(String msg : message)
write(msg.getBytes());
}
mgr.hideConnectingProgressBox();
if(connected){
mgr.connectedDialog();
mgr.msgsent();
System.out.println("Calibration connected");
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int bytes;
String apple = "";
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
if ( bytes != -1){
while ((bytes==bufferSize)&&(buffer[bufferSize-1] != 0)){
apple = apple + "_" + new String(buffer, 0, bytes);
bytes = mmInStream.read(buffer);
}
apple = apple + new String(buffer, 0, bytes -1);
System.out.println("message " + apple);
//pass data to UI CalibrationActivity
System.out.println("message out " + apple);
Message msga = mhandler.obtainMessage();
Bundle bundle = new Bundle();
bundle.putString("key", apple);
msga.setData(bundle);
mhandler.sendMessage(msga);
}
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
break;
}
}
}
Log.d("thread", "hideprogressBox");
if (!connected){
mgr.showConnectionErrBox();
}
}
}
public void connect(BluetoothDevice device) {
currentDevice = device;
BluetoothSocket tmp = null;
BluetoothManager.getInstance().getBluetoothAdapter().cancelDiscovery();
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
// tmp = device
// .createRfcommSocketToServiceRecord(BluetoothManager.SerialPortServiceClass_UUID);
Method m = device.getClass().getMethod("createRfcommSocket",
new Class[] { int.class });
tmp = (BluetoothSocket) m.invoke(device, 1);
// } catch (IOException e) {
// Log.e(TAG, "create() failed", e);
// return;
} catch (Exception e) {
Log.e(TAG, "Socket connection failed", e);
return;
}
bSocket = tmp;
try {
bSocket.connect();
} catch (IOException e1) {
Log.e(TAG, "Connection err", e1);
connectFailure = true;
return;
}
if (tmp != null) {
// Get Input/output stream for Socket
try {
mmInStream = bSocket.getInputStream();
mmOutStream = bSocket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
return;
}
}
connected = true;
connectFailure = false;
}
private Handler mhandler;
public void read(){
Log.i(TAG, "Read is running");
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int bytes;
String a = "";
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
if ( bytes != -1){
while ((bytes==bufferSize)&&(buffer[bufferSize-1] != 0)){
a = a + new String(buffer, 0, bytes);
bytes = mmInStream.read(buffer);
}
a = a + new String(buffer, 0, bytes -1);
System.out.println("message " + a);
}
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
break;
}
}
}
public void write(byte[] buffer) {
if (mmOutStream != null) {
try {
mmOutStream.write(buffer);
Log.d(TAG, "Message Sent");
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
} else {
//mgr.showConnectionErrBox();
}
}
public void stopConnection() {
try {
if(bSocket != null)
bSocket.close();
Log.e(TAG, "Connection closed");
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
public BluetoothDevice getCurrentDevice() {
return currentDevice;
}
public void setCurrentDevice(BluetoothDevice currentDevice) {
this.currentDevice = currentDevice;
}
public ArrayList<String> getMessage() {
return message;
}
public void setMessage(ArrayList<String> message) {
this.message = message;
}
}
Below is the affect portion
if(connected){
mgr.connectedDialog();
mgr.msgsent();
System.out.println("Calibration connected");
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int bytes;
String apple = "";
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
if ( bytes != -1){
while ((bytes==bufferSize)&&(buffer[bufferSize-1] != 0)){
apple = apple + "_" + new String(buffer, 0, bytes);
bytes = mmInStream.read(buffer);
}
apple = apple + new String(buffer, 0, bytes -1);
System.out.println("message " + apple);
//pass data to UI CalibrationActivity
System.out.println("message out " + apple);
Message msga = mhandler.obtainMessage();
Bundle bundle = new Bundle();
bundle.putString("key", apple);
msga.setData(bundle);
mhandler.sendMessage(msga);
}
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
break;
}
}
}
Below is the code for my Calibration Activity
package com.android;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import com.android.SimpleGestureFilter.SimpleGestureListener;
import com.android.backend.data.Playlist;
import com.android.backend.data.PlaylistManager;
import com.android.backend.data.SwitchBar;
import com.android.backend.data.bluetooth.BluetoothManager;
import com.android.backend.data.bluetooth.Connection;
import com.android.ui.UIManager;
import com.android.ui.playlist.PlaylistEntryList;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Editable;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager.LayoutParams;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
//public class CalibrationActivity extends Activity{
public class CalibrationActivity extends Activity implements SimpleGestureListener{
String gotBread;
public void handleMessage(Message msg)
{ switch(msg.what){
case 2:
Bundle got = getIntent().getExtras();
gotBread = got.getString("key");
TextView aa = (TextView) this.findViewById(R.id.stringinput);
aa.setText(gotBread);
break;
}
}
private SimpleGestureFilter detector;
#Override
public boolean dispatchTouchEvent(MotionEvent me){
this.detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
#Override
public void onSwipe(int direction) {
// TODO Auto-generated method stub
//final MainActivity tt = this;
String str = "";
switch (direction) {
//case SimpleGestureFilter.SWIPE_RIGHT : str = "Swipe Right";
case SimpleGestureFilter.SWIPE_RIGHT : this.finish();
break;
case SimpleGestureFilter.SWIPE_LEFT : str = "Swipe Left";
break;
case SimpleGestureFilter.SWIPE_DOWN : str = "Swipe Down";
break;
case SimpleGestureFilter.SWIPE_UP : str = "Swipe Up";
break;
}
//Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
#Override
public void onDoubleTap() {
// TODO Auto-generated method stub
//Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show();
//Do Nothing for now future development
}
private PlaylistManager playlistMgr;
private PlaylistEntryList playlistView; // Data for listview, stores current
// playlist in memory
public String createdNameList; // Indicated the name of currently Name of
// playlist that is being created
public Dialog dialog_customizePL, dialog_createPL, dialog_customizePLms; // Dialog boxes for
// Playlist creation
public UIManager uiMgr = new UIManager();
public String CONNECTED_DEVICE_MAC;
public String dialogboxtext;
public Connection Conn;
int i = 0;
protected void onPause() {
super.onPause();
//BluetoothManager.getInstance().disconnectAll();
unregisterReceiver(mRvcau); //Sequence is important
System.exit(0); // Kill off all thread to prevent connectiong lost popup
// I use system because is a calibration so I want user not to leave the activity else cannot calibrate
}
protected void onResume() { //restart bluetooth is accidently off it
super.onResume();
BluetoothManager.getInstance().init();
BluetoothManager.getInstance().getBluetoothAdapter().enable();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED); // IntentFilter class is important to declare for below filter
registerReceiver(mRvcau,filter); // mRvcau is the location of logic, filter is message identify by android
filter = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED); // Future deveploment
registerReceiver(mRvcau,filter);
filter = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED); // Future deveploment
registerReceiver(mRvcau,filter);
filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED); // Future deveploment
registerReceiver(mRvcau,filter);
}
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.remotedevicecalibration);
detector = new SimpleGestureFilter(this,this); ////////////////// For Gesture
playlistMgr = PlaylistManager.getInstance();
initUI();
uiMgr.initPlayListUI(this);
}
int connect = 0; // Check connection
int disconnect = 0; // Check disconnection
int requestdisconnect = 0;
int connectstatuschanges = 0;
public BroadcastReceiver mRvcau = new BroadcastReceiver(){ // The new is instantiate the class **always read from the back
// The line from the back is creating an instantiate of this class
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
//AutoActivity.this.finish();
connect = 1; // prevent activity from exiting
System.out.println("ACTION_ACL_CONNECTED " + connect);
}
else
{
connect = 0;
System.out.println("ACTION_ACL_CONNECTED " + connect);
}
if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) { //future development
disconnect = 1;
System.out.println("ACTION_ACL_DISCONNECTED " + disconnect);
}
else
{
disconnect = 0;
System.out.println("ACTION_ACL_DISCONNECTED " + disconnect);
}
if (BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED.equals(action)) { //future development
requestdisconnect = 1;
System.out.println("ACTION_ACL_DISCONNECT_REQUESTED " + requestdisconnect);
}
else
{
requestdisconnect = 0;
System.out.println("ACTION_ACL_DISCONNECT_REQUESTED " + requestdisconnect);
}
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) { //future development
connectstatuschanges = 1;
System.out.println("ACTION_BOND_STATE_CHANGED " + connectstatuschanges);
}
else
{
connectstatuschanges = 0;
System.out.println("ACTION_BOND_STATE_CHANGED " + connectstatuschanges);
}
}
};
/**
* Init layout component. Define Listener for Buttons and Dataset for
* ListViews
*/
#SuppressLint("ParserError")
public void initUI() {
Button Orange = (Button) findViewById(R.id.CalibrationOrange); // new method on test using image
Orange.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v){
// TODO Auto-generated method stub
activiteSingleConnection(20);
}
});
Button Blue = (Button) findViewById(R.id.CalibrationBlue); // new method on test using image icon to on the switch
Blue.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v){
// TODO Auto-generated method stub
activiteSingleConnection(21);
}
});
Button Green = (Button) findViewById(R.id.CalibrationGreen); // new method on test using image icon to on the switch
Green.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v){
// TODO Auto-generated method stub
activiteSingleConnection(22);
}
});
loadDataToMem();
}
public void activiteSingleConnection(int i) {
BluetoothManager btMgr = BluetoothManager.getInstance();
BluetoothDevice device = btMgr.getBluetoothAdapter().getRemoteDevice(
CONNECTED_DEVICE_MAC);
ArrayList<String> msg = new ArrayList<String>();
if(i == 20){
msg.add("N");
}
if(i == 21){
msg.add("J");
}
if(i == 22){
msg.add("I");
}
CharSequence fruit = null;
TextView aa = (TextView) this.findViewById(R.id.stringinput);
aa.setText(fruit);
btMgr.calibratesentMessage(uiMgr, device, msg);
}
public void loadDataToMem() {
try {
String str = "";
//StringBuffer buf = new StringBuffer();
FileInputStream input = this.openFileInput("bone.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(
input));
if (input != null) {
while ((str = reader.readLine()) != null) {
String[] buff = str.split(",");
TextView topView = (TextView) this
.findViewById(R.id.remotedevicecalibrationtextview1);
TextView bottomView = (TextView) this
.findViewById(R.id.remotedevicecalibrationtextView2);
topView.setText("Name : " + buff[0]);
bottomView.setText("Mac : " + buff[2]);
this.CONNECTED_DEVICE_MAC = buff[2];
Log.d("loadDataToMem", str);
}
}
input.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Below are my log cat error message
09-13 10:50:33.640: W/dalvikvm(2086): threadid=9: thread exiting with uncaught exception (group=0x40015560)
09-13 10:50:33.667: E/AndroidRuntime(2086): FATAL EXCEPTION: Thread-10
09-13 10:50:33.667: E/AndroidRuntime(2086): java.lang.NullPointerException
09-13 10:50:33.667: E/AndroidRuntime(2086): at com.android.backend.data.bluetooth.Connection.run(Connection.java:196)
Hope someone can advice me how to solve. Thank You.