Develop Reference

Reading values from Arduino IDE in Android Studio(java) ? There is no mistake as I can see but ıt doesn't work

Have a healthy day. As I mentioned in title, I want to read values from Arduino IDE (ESP32) . I ınstall nRF Connect mobile app because ı want to check if ı'm getting value correctly or not . I got true value.Then I write an android studio code as a beginner and from tutorials ofc. It's pairing devices and then if its name ESP32, ı wanna communicate it with arduiono but ı m getting empty array.After watching tutorials and reading stackoverflow posts ı ve decided to ask for help here. I will be glad if you help me. Thanks.
import android.Manifest;
import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.UUID;
import pl.bclogic.pulsator4droid.library.PulsatorLayout;
public class MainActivity extends AppCompatActivity {
BluetoothAdapter myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
ArrayAdapter<String> arrayAdapter;
ArrayList<String> stringArrayList = new ArrayList<String>();
private boolean alreadyExecuted = false;
private boolean alreadyExecuted2=false;
BluetoothSocket mmSocket;
BluetoothServerSocket mmServerSocket;
BluetoothDevice mmDevice;
OutputStream mmOutputStream;
InputStream mmInputStream;
Thread workerThread;
TextView myLabel;
#SuppressLint("MissingPermission")
private void connectAndTransferDataBT(BluetoothDevice mmDevice) throws IOException{
BluetoothSocket tmp = null;
InputStream tmpIn = null;
OutputStream tmpOut = null;
Handler handler = new Handler();
UUID uuid = UUID.fromString("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
try {
tmp = mmDevice.createRfcommSocketToServiceRecord(uuid);
} catch (IOException e) {
e.printStackTrace();
}
mmSocket = tmp;
try {
mmSocket.connect();
} catch (IOException e) {
e.printStackTrace();
}
try {
tmpIn = mmSocket.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
try {
tmpOut = mmSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
mmInputStream = tmpIn;
mmOutputStream = tmpOut;
byte [] mmBuffer = new byte[1024];
int numBytes; // bytes returned from read()
assert mmInputStream != null;
numBytes = mmInputStream.read(mmBuffer);
};
private void getLocationPermission()
{
ActivityResultLauncher<String[]> locationPermissionRequest =
registerForActivityResult(new ActivityResultContracts
.RequestMultiplePermissions(), result -> {
Boolean fineLocationGranted = result.getOrDefault(
Manifest.permission.ACCESS_FINE_LOCATION, false);
Boolean coarseLocationGranted = result.getOrDefault(
Manifest.permission.ACCESS_COARSE_LOCATION,false);
if (fineLocationGranted != null && fineLocationGranted) {
} else if (coarseLocationGranted != null && coarseLocationGranted)
{
} else
{
}
}
);
locationPermissionRequest.launch(new String[] {
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
});
}
public void statusCheck() {
final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
buildAlertMessageNoGps();
}
}
private void buildAlertMessageNoGps() {
if(!alreadyExecuted) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your GPS seems to be disabled, do you want to enable it?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int id) {
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int id) {
Toast.makeText(MainActivity.this, "You have to enable your GPS for using Bluetooth!", Toast.LENGTH_SHORT).show();
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
alreadyExecuted = true;
}
}
#SuppressLint("MissingPermission")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBluetoothAdapter =BluetoothAdapter.getDefaultAdapter();
Button scanningBtn = findViewById(R.id.scanningBtn);
ListView listView = findViewById(R.id.listView);
LocationManager lm = (LocationManager)getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
boolean gps_enabled = false;
boolean network_enabled = false;
PulsatorLayout pulsator = findViewById(R.id.pulsator);
TextView myLabel = findViewById(R.id.myLabel);
if(myBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth Is Not Available on this Device!", Toast.LENGTH_SHORT).show();
}
else
{
if(!myBluetoothAdapter.isEnabled())
{
//later
}
else
{
if(myBluetoothAdapter.isEnabled() && !myBluetoothAdapter.isDiscovering())
{
Intent intent = new Intent ( BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(intent,1);
statusCheck();
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
catch(Exception ex) {}
try {
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
catch(Exception ex) {}
if(!gps_enabled) {
buildAlertMessageNoGps();
}
getLocationPermission();
BroadcastReceiver myReceiver = new BroadcastReceiver() {
#SuppressLint("MissingPermission")
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action))
{
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if(!stringArrayList.contains("Device : "+device.getName())) {
stringArrayList.add("Device : " + device.getName());
if(!alreadyExecuted2)
{if (device.getName().equals("ESP32")) {
mmDevice = device;
alreadyExecuted2=true;
}}
arrayAdapter.notifyDataSetChanged();
}
}
}
};
scanningBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//scanningBtn.setEnabled(false);
pulsator.start();
myBluetoothAdapter.startDiscovery();
if(mmDevice!=null)
{
try {
connectAndTransferDataBT(mmDevice);
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(myReceiver,intentFilter);
arrayAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,stringArrayList);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String s = listView.getItemAtPosition(position).toString();
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//startActivity(new Intent(MainActivity.this,MainScreenActivity.class));
}
});
}
}
}
}
}
xml code
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView3"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_marginTop="25dp"
/>
<Button
android:id="#+id/scanningBtn"
android:layout_width="140dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_marginTop="25dp"
android:layout_marginBottom="17dp"
android:text="SCAN" />
<TextView
android:id="#+id/myLabel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
<pl.bclogic.pulsator4droid.library.PulsatorLayout
android:id="#+id/pulsator"
android:layout_width="match_parent"
android:layout_height="150dp"
app:pulse_count="4"
app:pulse_duration="3000"
app:pulse_interpolator="Accelerate"
android:layout_marginBottom="17dp"
app:pulse_repeat="0"
app:pulse_startFromScratch="false" />
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="530dp"
android:background="#color/white"
android:cacheColorHint="#FBF8F8" />
</LinearLayout>
</ScrollView>
</LinearLayout><![CDATA[
/>
]]>
</androidx.appcompat.widget.LinearLayoutCompat>
and arduino code from examples BLE_notify
/*
Video: https://www.youtube.com/watch?v=oCMOYS71NIU
Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-
snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp
Ported to Arduino ESP32 by Evandro Copercini
updated by chegewara
Create a BLE server that, once we receive a connection, will send periodic
notifications.
The service advertises itself as: 4fafc201-1fb5-459e-8fcc-c5c9c331914b
And has a characteristic of: beb5483e-36e1-4688-b7f5-ea07361b26a8
The design of creating the BLE server is:
1. Create a BLE Server
2. Create a BLE Service
3. Create a BLE Characteristic on the Service
4. Create a BLE Descriptor on the characteristic
5. Start the service.
6. Start advertising.
A connect hander associated with the server starts a background task that performs
notification
every couple of seconds.
*/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
BLEServer* pServer = NULL;
BLECharacteristic* pCharacteristic = NULL;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint32_t value = 0;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
void setup() {
Serial.begin(115200);
// Create the BLE Device
BLEDevice::init("ESP32");
// Create the BLE Server
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *pService = pServer->createService(SERVICE_UUID);
// Create a BLE Characteristic
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);
// https://www.bluetooth.com/specifications/gatt/viewer?
attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
// Create a BLE Descriptor
pCharacteristic->addDescriptor(new BLE2902());
// Start the service
pService->start();
// Start advertising
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(false);
pAdvertising->setMinPreferred(0x0); // set value to 0x00 to not advertise this parameter
BLEDevice::startAdvertising();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
if (deviceConnected) {
float temp = 25.5;
char send[8];
dtostrf(temp,2,1,send);
pCharacteristic->setValue((uint8_t*)&send, 4);
pCharacteristic->notify();
value++;
delay(1000); // bluetooth stack will go into congestion, if too many packets are
sent, in 6 hours test i was able to go as low as 3ms
}
// disconnecting
if (!deviceConnected && oldDeviceConnected) {
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
Serial.println("start advertising");
oldDeviceConnected = deviceConnected;
}
// connecting
if (deviceConnected && !oldDeviceConnected) {
// do stuff here on connecting
oldDeviceConnected = deviceConnected;
}
}

Your ESP32 code is Bluetooth Low Energy while your Android code is Bluetooth Classic.
You have to implement BLE in your android code
https://developer.android.com/guide/topics/connectivity/bluetooth/ble-overview

How to put a progress bar with thread safety in android while hitting a server and waiting for response?

I have an application where I am recording audio in an activity. User has a start recording and stop recording button to do that. Once user clicks the stop recording button, it sends the recorded mp3 file to server (encoded string) and server process it and a response is received. I want to do the following tasks:
Since this process is long, I want to do this in a separate thread(preferably).
The process of sending and receiving response is to be shown using progress bar.
User should be able to navigate to other screens while he is waiting(i.e. current activity may be destroyed)
I tried using Toast messages before and after the function where I send mp3 to server. But there is no sync, sometimes msg comes early, sometime it's late. That's why a proper progress bar is required.How to do this? Can AsyncTask be used with what I want to achieve in (3). or should I use some other form of multithreading. Please help.Below is the activity
(Please ignore the indentations, I couldn't fix the code on stack-overflow:
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.commons.io.FileUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class RecordActivity extends AppCompatActivity {
private static final String LOG_TAG = "AudioRecordTest";
private static String msg = "default";
public final static String Result_MESSAGE = "in.innovatehub.ankita_mehta.tinyears.ResultMESSAGE";
private static final int REQUESTCODE_RECORDING = 109201;
private Button mRecorderApp = null;
private static String mFileName = "music.mp3";
private static String mFilePath = String.valueOf(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS + "/TinyEars/"));
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
private ImageButton mRecordImageButton = null;
private ImageButton mPlayImageButton = null;
boolean mStartRecording = true;
boolean mStartPlaying = true;
private Button mShowStatsButton = null;
private static final String TAG = "RecordActivity";
private Handler handler = new Handler();
final Runnable updater = new Runnable() {
public void run() {
handler.postDelayed(this, 1);
if(mRecorder!=null) {
int maxAmplitude = mRecorder.getMaxAmplitude();
if (maxAmplitude != 0) {
// visualizerView.addAmplitude(maxAmplitude);
}
}
else{
}
}
};
private void onRecord(boolean start) {
if (start) {
startRecording();
} else {
stopRecording();
}
}
private void onPlay(boolean start) {
if (start) {
startPlaying();
} else {
stopPlaying();
}
}
private void startPlaying() {
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(mFilePath+"/"+mFileName);
mPlayer.prepare();
mPlayer.start();
mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
Log.i("Completion Listener", "Song Complete");
stopPlaying();
mRecordImageButton.setEnabled(true);
}
});
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
}
private void stopPlaying() {
if (mPlayer != null) {
mPlayer.reset();
mPlayer.release();
mPlayer = null;
mPlayImageButton.setImageResource(R.drawable.playicon);
// mStartPlaying = true;
} else {
mPlayImageButton.setImageResource(R.drawable.pauseicon);
// mStartPlaying = false;
}
}
private void startRecording() {
AudioRecordTest(String.valueOf(System.currentTimeMillis()));
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mRecorder.setOutputFile(mFilePath+"/"+mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
try {
mRecorder.start();
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
} catch (Exception e) {
Log.e(LOG_TAG, "start() failed");
}
}
private void stopRecording() {
if (mRecorder != null) {
mRecorder.stop();
mRecorder.release();
Toast.makeText(getApplicationContext(), "Audio recorded successfully",Toast.LENGTH_LONG).show();
mRecorder = null;
mRecordImageButton.setImageResource(R.drawable.micicon);
// mStartRecording = true;
} else {
mRecordImageButton.setImageResource(R.drawable.stopicon);
// mStartRecording = false;
}
}
public void AudioRecordTest(String text) {
boolean exists = (new File(mFilePath+"/"+mFileName)).exists();
if (!exists) {
new File(mFileName).mkdirs();
}
// mFileName += "audiorecordtest.mp3";
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_record);
Log.d(TAG,"HERE IS FILE PATH"+mFilePath+"/"+mFileName);
mRecordImageButton = (ImageButton) findViewById(R.id.imageButton2);
mPlayImageButton = (ImageButton) findViewById(R.id.imageButton3);
mShowStatsButton = (Button) findViewById(R.id.showMeStats);
mRecorderApp = (Button) findViewById(R.id.recorderApp);
AudioRecordTest("00000");
mRecordImageButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
onRecord(mStartRecording);
if (mStartRecording) {
mRecordImageButton.setImageResource(R.drawable.stopicon);
mPlayImageButton.setEnabled(false);
//setText("Stop recording");
} else {
mRecordImageButton.setImageResource(R.drawable.micicon);
mPlayImageButton.setEnabled(true);
mShowStatsButton.setEnabled(true);
mShowStatsButton.setVisibility(View.VISIBLE);
Toast.makeText(getApplicationContext(),"Hold on... we are getting the results!",Toast.LENGTH_SHORT).show();
pressedSavBtn();
Toast.makeText(getApplicationContext(),"Parsing done ... now you may see the results!",Toast.LENGTH_SHORT).show();
//setText("Start recording");
}
mStartRecording = !mStartRecording;
}
});
mPlayImageButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
onPlay(mStartPlaying);
if (mStartPlaying) {
mPlayImageButton.setImageResource(R.drawable.pauseicon);
mRecordImageButton.setEnabled(false);
mShowStatsButton.setEnabled(false);
//setText("Stop playing");
} else {
mPlayImageButton.setImageResource(R.drawable.playicon);
mRecordImageButton.setEnabled(true);
mShowStatsButton.setEnabled(false);
//setText("Start playing");
}
mStartPlaying = !mStartPlaying;
}
});
//Calling recorder ...
mRecorderApp.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent intent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
if (isAvailable(getApplicationContext(), intent)) {
startActivityForResult(intent, REQUESTCODE_RECORDING);
}
}
});
mShowStatsButton = (Button) findViewById(R.id.showMeStats);
mShowStatsButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
sendResults(msg);
}
});
}
public void pressedSavBtn(){
try {
thread.start();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
mShowStatsButton.setVisibility(View.VISIBLE);
}
}
public void writeToFile(String data)
{
// Get the directory for the user's public pictures directory.
final File path = new File(mFilePath+"/");
// Make sure the path directory exists.
if(!path.exists())
{
// Make it, if it doesn't exit
path.mkdirs();
}
final File file = new File(path, "config.txt");
// Save your stream, don't forget to flush() it before closing it.
try
{
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(data);
myOutWriter.close();
fOut.flush();
fOut.close();
}
catch (IOException e)
{
Log.e("Exception", "File write failed: " + e.toString());
}
}
private static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append((line + "\n"));
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
try {
//THIS IS FILE ENCODING CODE
File file = new File(mFilePath+"/"+mFileName);
byte[] bytes = FileUtils.readFileToByteArray(file);
String encoded = Base64.encodeToString(bytes, 0);
Log.d("~~~~~~~~ Encoded: ", encoded);
writeToFile(encoded);
//THIS IS URL CONN CODE
String link = "http://192.168.50.0:9000/divide_result";
URL url = new URL(link);
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(link);
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("Name", "StackOverFlow"));
nameValuePairs.add(new BasicNameValuePair("Date", encoded));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
String sb = convertStreamToString(response.getEntity().getContent());
Log.d(TAG,"MESSAGE NOW"+sb);
Log.d(TAG, sb);
msg = sb.toString();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
public void sendResults(String res){
Log.d(TAG, "Inside on create, Navigating to Result Screen Activity!");
Intent intent = new Intent(getApplicationContext(), ResultsScreenActivity.class);
intent.putExtra(Result_MESSAGE, res);
startActivity(intent);
}
public static boolean isAvailable(Context ctx, Intent intent) {
final PackageManager mgr = ctx.getPackageManager();
List<ResolveInfo> list = mgr.queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
}
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == REQUESTCODE_RECORDING) {
if (resultCode == RESULT_OK) {
Uri audioUri = intent.getData();
// make use of this MediaStore uri
// e.g. store it somewhere
}
else {
// react meaningful to problems
}
}
else {
super.onActivityResult(requestCode,
resultCode, intent);
}
}
#Override
public void onPause() {
super.onPause();
if (mRecorder != null) {
mRecorder.release();
mRecorder = null;
}
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
thread.stop();
}
#Override
protected void onDestroy() {
super.onDestroy();
handler.removeCallbacks(updater);
if(mRecorder!=null) {
mRecorder.stop();
mRecorder.reset();
mRecorder.release();
}
}
#Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
handler.post(updater);
}
}
Also below is the layout-xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_record"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center|center_horizontal"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:screenOrientation="portrait"
android:orientation="vertical"
tools:context="in.innovatehub.mobile.ankita_mehta.tinyears.RecordActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/linearLayout_record"
android:orientation="vertical"
android:gravity="center">
<ImageButton
android:id="#+id/imageButton2"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:scaleType="fitXY"
android:src="#drawable/micicon" />
<ImageButton
android:id="#+id/imageButton3"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:scaleType="fitXY"
android:src="#drawable/playicon" />
<Button
android:id="#+id/showMeStats"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:visibility="gone"
android:onClick="loadStats"
android:text="#string/showMeStats" />
<Button
android:id="#+id/recorderApp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="invisible"
android:gravity="center"
android:text="#string/UseRecorderApp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/loadStatsLinearLayout"
android:gravity="center"
android:visibility="gone"
android:orientation="vertical">
<TextView
android:id="#+id/loadingMessage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/loadingMessage"
/>
<ProgressBar
android:id="#+id/downloadProgress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="true"
/>
</LinearLayout>
</LinearLayout>

You can use an IntentService to upload your content to the server. By default, it runs on a seperate thread and is not activity bound. Then use a broadcast receiver to communicate the result back to any activity. You can find an example here.
For the progress bar, you can create a notification and show the progress bar there, this will not block your application's UI.

For hitting the server at you should use AsyncTask or Runnable thread, without disturb the main tread
for custome progress dialog use the following code
xml file.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:background="#color/color_white"
android:padding="5dp" >
<ProgressBar
android:id="#+id/layCustomContentProgress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/layCustomProgressHeading"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/layCustomProgressInfo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Small Text"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
</LinearLayout>
and the method
public Dialog getCustomPogressDialog(Context context, String heading, String text) {
// Declare the customer dialog
Dialog dlgProgress = new Dialog(context);
// Set no title for the dialog
dlgProgress.requestWindowFeature(Window.FEATURE_NO_TITLE);
// Set the content view to the customer_alert layout
dlgProgress.setContentView(R.layout.layout_custom_process_progress);
// Cancel the dialog when touched outside.
dlgProgress.setCanceledOnTouchOutside(false);
// Set the main heading
TextView dlgHeading = (TextView) dlgProgress.findViewById(R.id.layCustomProgressHeading);
dlgHeading.setText(heading);
// set the info
TextView dlgInfo = (TextView) dlgProgress.findViewById(R.id.layCustomProgressInfo);
dlgInfo.setText(text);
// Return the refenrece to the dialog
return dlgProgress;
}

TextView.setText() only displays final change after sleep()

I am relatively new to Android and the finer details often result in my programme not running how I want it to.
The TextView (in this case tvQuestion) is supposed to change its contents, wait, and then change them again, however the first change is not seen, and the programme waits and displays only the last change.
Side note, all the contents are gathered from a SQLite Database and put into a custom object Question.
I believe the problem is in the onClick(View v) method, however any and all help is appreciated.
Here is my code:
package com.infernalpoison.falseorfact.util;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.infernalpoison.falseorfact.R;
public class Play extends Activity implements View.OnClickListener {
final private Context playContext = this;
private int correct = 0;
private int wrong = 0;
private TextView tvQuestion;
private ImageView btnFalse, btnFact;
private Question questionObj;
private Thread thrNewQuestion = new Thread() {
public void run() {
DatabaseConstruction dbc = new DatabaseConstruction(playContext);
try {
dbc.open();
questionObj = dbc.getRdmQ();
} catch (Exception e) {
e.printStackTrace();
} finally {
tvQuestion.setText(questionObj.getQuestion());
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);// Remove title bar
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN); // Remove notification bar
setContentView(R.layout.activity_play);
tvQuestion = (TextView) findViewById(R.id.tvQuestion);
btnFact = (ImageView) findViewById(R.id.btn_fact);
btnFact.setOnClickListener(this);
btnFalse = (ImageView) findViewById(R.id.btn_false);
btnFalse.setOnClickListener(this);
questionObj = new Question();
thrNewQuestion.run();
}
#Override
public void onClick(View v) {
switch (v.getId()) {
**case R.id.btn_fact:
factSelect();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
thrNewQuestion.run();
break;
case R.id.btn_false:
falseSelect();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
thrNewQuestion.run();
break;**
}
}
private void factSelect() {
if (questionObj.isAnswer() == true) {
correct++;
tvQuestion.setText("That is Correct! Well Done!");
} else {
wrong++;
tvQuestion.setText("That is Incorrect. " + questionObj.getFactCorrection());
//TODO ADD MECH TO EXIT
}
}
private void falseSelect() {
if (questionObj.isAnswer() == false) {
correct++;
tvQuestion.setText("That is Correct! Well Done!");
} else {
wrong++;
tvQuestion.setText("That is Incorrect. " + questionObj.getFalseCorrection());
//TODO ADD MECH TO EXIT
}
}
}
And the xml layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.infernalpoison.falseorfact.util.PlayFragment">
<ImageView
android:id="#+id/btn_false"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:adjustViewBounds="true"
android:clickable="true"
android:scaleType="fitXY"
android:src="#drawable/btn_false" />
<TextView
android:id="#+id/tvQuestion"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerInParent="true"
android:text="Empty" />
<ImageView
android:id="#+id/btn_fact"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:adjustViewBounds="true"
android:clickable="true"
android:scaleType="centerCrop"
android:src="#drawable/btn_fact" />
Thanks in advance.
PS this is my first post so please notify me if you need more info!

instead of:
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
thrNewQuestion.run();
Do something like this:
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
thrNewQuestion.run();
}
}, 2000);

Customize text inside Edittext for chatting

I want to customize the text inside the edittext of my chatting app. I want to bold the username and normal font for his message.
For example;
usernamejay: Hi This is Jay. How are you?
also make 1 space for reply after the message of usernamejay. i also want to change font color of username. Also if possible put message balloon for every message.
Example:
usernamejay: Hi This is Jay. How are you?
usernameclark: I'm Fine. Can i call you now for a meeting?
Can anyone help me how. This is the code for Java
import java.io.UnsupportedEncodingException;
import com.example.healthhelpv2.*;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import at.vcity.androidim.interfaces.IAppManager;
import at.vcity.androidim.services.IMService;
import at.vcity.androidim.tools.FriendController;
import at.vcity.androidim.tools.LocalStorageHandler;
import at.vcity.androidim.types.FriendInfo;
import at.vcity.androidim.types.MessageInfo;
public class Messaging extends Activity {
private static final int MESSAGE_CANNOT_BE_SENT = 0;
public String username;
private EditText messageText;
private EditText messageHistoryText;
private Button sendMessageButton;
private IAppManager imService;
private FriendInfo friend = new FriendInfo();
private LocalStorageHandler localstoragehandler;
private Cursor dbCursor;
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
imService = null;
Toast.makeText(Messaging.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
#Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.messaging_screen); //messaging_screen);
messageHistoryText = (EditText) findViewById(R.id.messageHistory);
messageText = (EditText) findViewById(R.id.message);
messageText.requestFocus();
sendMessageButton = (Button) findViewById(R.id.sendMessageButton);
Bundle extras = this.getIntent().getExtras();
friend.userName = extras.getString(FriendInfo.USERNAME);
friend.ip = extras.getString(FriendInfo.IP);
friend.port = extras.getString(FriendInfo.PORT);
String msg = extras.getString(MessageInfo.MESSAGETEXT);
setTitle("Messaging with " + friend.userName);
// EditText friendUserName = (EditText) findViewById(R.id.friendUserName);
// friendUserName.setText(friend.userName);
localstoragehandler = new LocalStorageHandler(this);
dbCursor = localstoragehandler.get(friend.userName, IMService.USERNAME );
if (dbCursor.getCount() > 0){
int noOfScorer = 0;
dbCursor.moveToFirst();
while ((!dbCursor.isAfterLast())&&noOfScorer<dbCursor.getCount())
{
noOfScorer++;
this.appendToMessageHistory(dbCursor.getString(2) , dbCursor.getString(3));
dbCursor.moveToNext();
}
}
localstoragehandler.close();
if (msg != null)
{
this.appendToMessageHistory(friend.userName , msg);
((NotificationManager)getSystemService(NOTIFICATION_SERVICE)).cancel((friend.userName+msg).hashCode());
}
sendMessageButton.setOnClickListener(new OnClickListener(){
CharSequence message;
Handler handler = new Handler();
public void onClick(View arg0) {
message = messageText.getText();
if (message.length()>0)
{
appendToMessageHistory(imService.getUsername(), message.toString());
localstoragehandler.insert(imService.getUsername(), friend.userName, message.toString());
messageText.setText("");
Thread thread = new Thread(){
public void run() {
try {
if (imService.sendMessage(imService.getUsername(), friend.userName, message.toString()) == null)
{
handler.post(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),R.string.message_cannot_be_sent, Toast.LENGTH_LONG).show();
//showDialog(MESSAGE_CANNOT_BE_SENT);
}
});
}
} catch (UnsupportedEncodingException e) {
Toast.makeText(getApplicationContext(),R.string.message_cannot_be_sent, Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
};
thread.start();
}
}});
messageText.setOnKeyListener(new OnKeyListener(){
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if (keyCode == 66){
sendMessageButton.performClick();
return true;
}
return false;
}
});
}
#Override
protected Dialog onCreateDialog(int id) {
int message = -1;
switch (id)
{
case MESSAGE_CANNOT_BE_SENT:
message = R.string.message_cannot_be_sent;
break;
}
if (message == -1)
{
return null;
}
else
{
return new AlertDialog.Builder(Messaging.this)
.setMessage(message)
.setPositiveButton(R.string.OK, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.create();
}
}
#Override
protected void onPause() {
super.onPause();
unregisterReceiver(messageReceiver);
unbindService(mConnection);
FriendController.setActiveFriend(null);
}
#Override
protected void onResume()
{
super.onResume();
bindService(new Intent(Messaging.this, IMService.class), mConnection , Context.BIND_AUTO_CREATE);
IntentFilter i = new IntentFilter();
i.addAction(IMService.TAKE_MESSAGE);
registerReceiver(messageReceiver, i);
FriendController.setActiveFriend(friend.userName);
}
public class MessageReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent)
{
Bundle extra = intent.getExtras();
String username = extra.getString(MessageInfo.USERID);
String message = extra.getString(MessageInfo.MESSAGETEXT);
if (username != null && message != null)
{
if (friend.userName.equals(username)) {
appendToMessageHistory(username, message);
localstoragehandler.insert(username,imService.getUsername(), message);
}
else {
if (message.length() > 15) {
message = message.substring(0, 15);
}
Toast.makeText(Messaging.this, username + " says '"+
message + "'",
Toast.LENGTH_SHORT).show();
}
}
}
};
private MessageReceiver messageReceiver = new MessageReceiver();
public void appendToMessageHistory(String username, String message) {
if (username != null && message != null) {
messageHistoryText.append(username + ":\n");
messageHistoryText.append(message + "\n");
}
}
#Override
protected void onDestroy() {
super.onDestroy();
if (localstoragehandler != null) {
localstoragehandler.close();
}
if (dbCursor != null) {
dbCursor.close();
}
}
}
The XML messaging_screen
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ccbfbf"
android:orientation="vertical"
android:padding="10dip" >
<!--
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:text="Friend:"
/>
<EditText android:id="#+id/friendUserName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:singleLine="true"
android:editable="false" />
-->
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:text="Messages:"/>
<EditText android:id="#+id/messageHistory"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:layout_weight="1"
android:editable="false"
android:gravity="top"
android:scrollbars="vertical"
android:scrollbarSize="10px"
/>
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="4">
<EditText
android:id="#+id/message"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="top"
android:hint="Type message here!" />
<Button android:id="#+id/sendMessageButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="4"
android:text="Send"/>
</LinearLayout>
</LinearLayout>

Do this way Hope this works for you
EditText editText = (EditText)findViewById(R.id.editText);
String userName = "usernamejay";
String message = "Hi This is Jay. How are you?";
String finalStr = "<b>"+userName+":</b> "+message+"";
editText.setText(Html.fromHtml(finalStr));

On Android you can use HTML to style the text inside a TextView, see here http://daniel-codes.blogspot.pt/2011/04/html-in-textviews.html

You could also use a spannable string, may be you could look at a portion of the code in this answer.
A code extract from the link
final SpannableString out0 = new SpannableString(source[position]);
StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
out0.setSpan(boldSpan, 6, 17, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
holder.tv.setText(out0);
P.S: but please read the solution in the link before you start applying things in your code.

Android Socket Client issue

I have a question regarding Android socket client application. I am suppose to use it to test the connection with a socket server software. But the application crashes everytime i press any of the button once. Does anyone know where the problem lies in my application?
package ab.2develop.Sockets;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ToggleButton;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;
import android.os.SystemClock;
public class SocketsActivity extends Activity {
static final String NICKNAME = "abc";
Button btn_start;
public static ProgressBar progressBar;//id of progressbar
public static ProgressBar lamp1; //id of progressbar
public TextView txt_percentage;
//---socket---
InetAddress serverAddress;
Socket socket;
//---all the Views---
static TextView txtMessagesReceived;
static TextView numBytesReceived;
EditText txtMessage;
//---thread for communicating on the socket---
CommsThread commsThread;
//---used for updating the UI on the main activity---
static Handler UIupdater = new Handler() {
public int value1;
public int value2;
#Override
public void handleMessage(Message msg) {
int numOfBytesReceived = msg.arg1;
byte[] buffer = (byte[]) msg.obj;
//---convert the entire byte array to string---
String strReceived = new String(buffer);
//---extract only the actual string received---
strReceived = strReceived.substring(
0, numOfBytesReceived);
String strleft = strReceived.substring(0,3);
// value1++;
if (strleft.equals("111"))
{
value1++;
progressBar.setProgress(value1);
}
if (strleft.equals("110"))
{
value1--;
progressBar.setProgress(value1);
}
if (strleft.equals("221"))
{
value2++;
lamp1.setProgress(value2);
}
if (strleft.equals("220"))
{
value2--;
lamp1.setProgress(value2);
}
//---display the text received on the TextView---
txtMessagesReceived.setText("");
txtMessagesReceived.setText(
// txtMessagesReceived.getText().toString() +
// strReceived + numOfBytesReceived + value1);
txtMessagesReceived.getText().toString() + strleft + value1);
// numBytesReceived.setText(
// numBytesReceived.getText() );
}
};
private class CreateCommThreadTask extends AsyncTask
<Void, Integer, Void> {
#Override
protected Void doInBackground(Void... params) {
try {
//---create a socket---
serverAddress =
//InetAddress.getByName("192.168.1.105");
//socket = new Socket(serverAddress, 500);
InetAddress.getByName("192.168.0.200");
socket = new Socket(serverAddress, 5000);
commsThread = new CommsThread(socket);
commsThread.start();
//---sign in for the user; sends the nick name---
sendToServer(NICKNAME);
} catch (UnknownHostException e) {
Log.d("Sockets", e.getLocalizedMessage());
} catch (IOException e) {
Log.d("Sockets", e.getLocalizedMessage());
}
return null;
}
}
private class WriteToServerTask extends AsyncTask
<byte[], Void, Void> {
protected Void doInBackground(byte[]...data) {
commsThread.write(data[0]);
return null;
}
}
private class CloseSocketTask extends AsyncTask
<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
try {
socket.close();
} catch (IOException e) {
Log.d("Sockets", e.getLocalizedMessage());
}
return null;
}
}
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//---get the views---
txtMessagesReceived = (TextView)
findViewById(R.id.txtMessagesReceived);
btn_start = (Button) findViewById(R.id.btn_start);
progressBar = (ProgressBar) findViewById(R.id.progress);
lamp1 = (ProgressBar) findViewById(R.id.lamp1);
txt_percentage= (TextView) findViewById(R.id.txt_percentage);
btn_start.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btn_start.setEnabled(false);
}
});
}
public void onClickSend(View view) {
//---send the message to the server---
sendToServer(txtMessage.getText().toString());
}
private void sendToServer(String message) {
byte[] theByteArray =
message.getBytes();
new WriteToServerTask().execute(theByteArray);
}
#Override
public void onResume() {
super.onResume();
new CreateCommThreadTask().execute();
}
#Override
public void onPause() {
super.onPause();
new CloseSocketTask().execute();
}
public void onClickLight11(View view) {
//---send the message to the server---
String str = "101".toString();
sendToServer(str);
//sendToServer(txtMessage.getText().toString());
}
public void onClickLight21(View view) {
//---send the message to the server---
String str = "201".toString();
sendToServer(str);
//sendToServer(txtMessage.getText().toString());
}
public void onClickLight31(View view) {
//---send the message to the server---
String str = "301".toString();
sendToServer(str);
//sendToServer(txtMessage.getText().toString());
}
public void onClickLight00(View view) {
//---send the message to the server---
String str = "000".toString();
sendToServer(str);
//sendToServer(txtMessage.getText().toString());
}
public void onClickLight55(View view) {
//---send the message to the server---
String str = "555".toString();
sendToServer(str);
//sendToServer(txtMessage.getText().toString());
}
public void onToggleClicked(View view) {
// Is the toggle on?
boolean on = ((ToggleButton) view).isChecked();
if (on) {
String str = "301".toString();
sendToServer(str);
} else {
String str = "000".toString();
sendToServer(str);
}
}
}
package ab.2develop.Sockets;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import android.util.Log;
public class CommsThread extends Thread {
private final Socket socket;
private final InputStream inputStream;
private final OutputStream outputStream;
public CommsThread(Socket sock) {
socket = sock;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
//---creates the inputstream and outputstream objects
// for reading and writing through the sockets---
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.d("SocketChat", e.getLocalizedMessage());
}
inputStream = tmpIn;
outputStream = tmpOut;
}
public void run() {
//---buffer store for the stream---
byte[] buffer = new byte[1024];
//---bytes returned from read()---
int bytes;
//---keep listening to the InputStream until an
// exception occurs---
while (true) {
try {
//---read from the inputStream---
bytes = inputStream.read(buffer);
//---update the main activity UI---
SocketsActivity.UIupdater.obtainMessage(
0,bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
break;
}
}
}
//---call this from the main activity to
// send data to the remote device---
public void write(byte[] bytes) {
try {
outputStream.write(bytes);
} catch (IOException e) { }
}
//---call this from the main activity to
// shutdown the connection---
public void cancel() {
try {
socket.close();
} catch (IOException e) { }
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btn_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/progress"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:minWidth="120dp"
android:text="#string/start_btn" />
<TextView
android:id="#+id/txtMessagesReceived"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:textSize="30dip"
android:text="#string/msg_received"
android:scrollbars = "vertical" />
<TextView
android:id="#+id/txt_percentage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/progress"
android:text="downloading 0%"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/numBytesReceived"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:textSize="30dip"
android:text="#string/num_msg_received"
android:scrollbars = "vertical" />
<Button
android:id="#+id/Light11"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickLight11"
android:text="#string/button_send_Light11" />
<Button
android:id="#+id/Light21"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickLight21"
android:text="#string/button_send_Light21" />
<Button
android:id="#+id/Light31"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickLight31"
android:text="#string/button_send_Light31" />
<Button
android:id="#+id/Light00"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickLight00"
android:text="#string/button_send_Light00" />
<Button
android:id="#+id/Light55"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickLight55"
android:text="#string/button_send_Light55" />
<ToggleButton
android:id="#+id/togglebutton"
android:textSize="30dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOn="Light1 on"
android:textOff="Light1 off"
android:onClick="onToggleClicked"/>
<ProgressBar
android:id="#+id/progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:layout_marginTop="34dp" />
<ProgressBar
android:id="#+id/lamp1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="34dp" />
</LinearLayout>

Check your stack trace. The exception is thrown by
commsThread.write(data[0]);
That clearly indicates that either commsThread or data is null.