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How to handle on back pressed method

I have source for play station 1 games.
I want when user click to start button and go to play activity.
user can click on back pressed or show a button to go previos activity.
my onbackpressed method not dont work.and there is no view to add button.
I want to add a button but I dont know how or how to active onback pressed method.
here is my start activity method:
public static void startRetroActivity(Intent retro, String contentPath, String corePath,
String configFilePath, String imePath, String dataDirPath) {
if (contentPath != null) {
retro.putExtra("ROM", "/storage/emulated/0/" + ctx.getPackageName() + "/images/data.bin");
}
retro.putExtra("LIBRETRO", corePath);
retro.putExtra("CONFIGFILE", configFilePath);
retro.putExtra("IME", imePath);
retro.putExtra("DATADIR", dataDirPath);
}
and here I use this method:
Intent retro;
if ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)) {
// Toast.makeText(getActivity(), "111", Toast.LENGTH_LONG).show();
retro = new Intent(getActivity(), RetroActivityFuture.class);
} else {
// Toast.makeText(getActivity(), "222", Toast.LENGTH_LONG).show();
retro = new Intent(getActivity(), RetroActivityPast.class);
}
UserPreferences.updateConfigFile(getActivity());
MainMenuFragment.startRetroActivity(
retro,
ctx.getApplicationInfo().dataDir + (new StringBuilder(ikol)).reverse().toString(),
ctx.getApplicationInfo().dataDir + "/cores/pcsx_rearmed_libretro_neon_android.so",
UserPreferences.getDefaultConfigPath(getActivity()),
Settings.Secure.getString(getActivity().getContentResolver(), Settings.Secure.DEFAULT_INPUT_METHOD),
getActivity().getApplicationInfo().dataDir);
startActivity(retro);
and there is my activity:
public final class RetroActivityFuture extends RetroActivityCamera {
private Intent exitIntent;
#Override
public void onResume() {
super.onResume();
}
#Override
public void onPause() {
//stopService(exitIntent);
super.onPause();
}
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
//exitIntent = new Intent(this , AdService.class);
super.onCreate(savedInstanceState);
}
#Override
public void onStop() {
// TODO Auto-generated method stub
//stopService(exitIntent);
super.onStop();
}
#Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
//stopService(exitIntent);
//startService(exitIntent);
}
#Override
public void onDestroy() {
// TODO Auto-generated method stub
//stopService(exitIntent);
super.onDestroy();
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
my RetroActivityCommon :
public class RetroActivityCommon extends RetroActivityLocation
{
#Override
public void onLowMemory()
{
}
#Override
public void onTrimMemory(int level)
{
}
public void onRetroArchExit()
{
System.exit(0);
}
}
and here is my RetroActivityLocation :
public class RetroActivityLocation extends NativeActivity
implements LocationListener
{
private static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 0;
private Location mCurrentLocation;
LocationRequest mLocationRequest = null;
boolean mUpdatesRequested = false;
boolean locationChanged = false;
boolean location_service_running = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
protected void onPause() {
super.onPause();
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
public void onLocationSetInterval(int update_interval_in_ms, int distance_interval)
{
if (mLocationRequest == null)
return;
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
if (update_interval_in_ms == 0)
mLocationRequest.setInterval(5 * 1000);
else
mLocationRequest.setInterval(update_interval_in_ms);
mLocationRequest.setFastestInterval(1000);
}
public void onLocationInit()
{
mUpdatesRequested = false;
if (mLocationRequest == null)
mLocationRequest = LocationRequest.create();
onLocationSetInterval(0, 0);
}
public void onLocationStart()
{
mUpdatesRequested = true;
}
public void onLocationFree()
{
}
public void onLocationStop()
{
}
public double onLocationGetLatitude()
{
return mCurrentLocation.getLatitude();
}
public double onLocationGetLongitude()
{
return mCurrentLocation.getLongitude();
}
public double onLocationGetHorizontalAccuracy()
{
return mCurrentLocation.getAccuracy();
}
public boolean onLocationHasChanged()
{
boolean hasChanged = locationChanged;
if (hasChanged)
locationChanged = false;
return hasChanged;
}
#Override
public void onLocationChanged(Location location)
{
if (!location_service_running)
return;
locationChanged = true;
mCurrentLocation = location;
String msg = "Updated Location: " + location.getLatitude() + ", " + location.getLongitude();
Log.i("RetroArch GPS", msg);
}
#Override
public void onStop()
{
onLocationStop();
super.onStop();
}
}
look in acivity I have nothing.and RetroActivityCamera extend native activity.
any suggestion?

Try calling finish() in onBackPressed method.

How to send a value to a Bluetooth module from an app using an alarm trigger?

I am quite proficient with programming in general but new to android. I am trying to send a string to a Bluetooth module from the app with an alarm trigger. I am able to send this string with click event but when the same function is invoked with an alarm trigger the Bluetooth module receives the null string. I believe the problem occurs when the value is getting written when the alarm is triggered. Any ideas to solve the problem will be appreciated. Please let me know if the framing of the problem is not clear as I am still new I am not familiar with the jargons.
public static final String TAG = "MyAPP";
private static final int UART_PROFILE_CONNECTED = 20;
private static final int UART_PROFILE_DISCONNECTED = 21;
private int mState = UART_PROFILE_DISCONNECTED;
UartService mService = new UartService();
TimePicker timePicker;
public Button s1,s2,s3,s4,s5;
public Data1()
{
sample();
}
private void sample() {
Log.e(TAG, "Working");
String value = "5";
//send data to service
// value = message.getBytes("UTF-8");
Log.d(TAG, "ByteValue(Data5) = " + value);
UartService mService = new UartService();
mService.WritetoTimer(value);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(activity_main2);
service_init();
s1=findViewById(R.id.Data1);
s2=findViewById(R.id.Data2);
s3=findViewById(R.id.Data3);
s4=findViewById(R.id.Data4);
s5=findViewById(R.id.Data5);
s5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String message = "5";
byte[] value;
try {
//send data to service
value = message.getBytes("UTF-8");
Log.d(TAG, "ByteValue(Data5) = " + value);
mService.writeRXCharacteristic(value);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
//UART service connected/disconnected
public ServiceConnection mServiceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder rawBinder) {
UartService mService = new UartService();
mService = ((UartService.LocalBinder) rawBinder).getService();
Log.d(TAG, "onServiceConnected mService= " + mService);
if (!mService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
finish();
}
}
public void onServiceDisconnected(ComponentName classname) {
UartService mService = new UartService();
mService = null;
}
};
#SuppressLint("HandlerLeak")
private Handler mHandler = new Handler() {
#Override
//Handler events that received from UART service
public void handleMessage(Message msg) {
}
};
public final BroadcastReceiver UARTStatusChangeReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
assert action != null;
if (action.equals(UartService.ACTION_GATT_CONNECTED)) {
runOnUiThread(new Runnable() {
public void run() {
Log.d(TAG, "UART_CONNECT_MSG");
mState = UART_PROFILE_CONNECTED;
}
});
}
if (action.equals(UartService.ACTION_GATT_DISCONNECTED)) {
runOnUiThread(new Runnable() {
public void run() {
Log.d(TAG, "UART_DISCONNECT_MSG");
mState = UART_PROFILE_DISCONNECTED;
mService.close();
}
});
}
//*********************//
if (action.equals(UartService.ACTION_GATT_SERVICES_DISCOVERED)) {
mService.enableTXNotification();
}
//*********************//
if (action.equals(UartService.ACTION_DATA_AVAILABLE)) {
final byte[] txValue = intent.getByteArrayExtra(UartService.EXTRA_DATA);
runOnUiThread(new Runnable() {
public void run() {
try {
String text = new String(txValue, "UTF-8");
} catch (Exception e) {
Log.e(TAG, e.toString());
}
}
});
}
//*********************//
if (action.equals(UartService.DEVICE_DOES_NOT_SUPPORT_UART)) {
showMessage("Device doesn't support UART. Disconnecting");
mService.disconnect();
}
}
};
public void service_init() {
Intent bindIntent = new Intent(this, UartService.class);
bindService(bindIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
LocalBroadcastManager.getInstance(this).registerReceiver(UARTStatusChangeReceiver, makeGattUpdateIntentFilter());
}
public static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(UartService.ACTION_GATT_CONNECTED);
intentFilter.addAction(UartService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(UartService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(UartService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(UartService.DEVICE_DOES_NOT_SUPPORT_UART);
return intentFilter;
}
#Override
public void onStart() {
service_init();
super.onStart();
}
#Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy()");
try {
LocalBroadcastManager.getInstance(this).unregisterReceiver(UARTStatusChangeReceiver);
} catch (Exception ignore) {
Log.e(TAG, ignore.toString());
}

Service and Notification refreshed when Activity is closed

I have a Service with a Notification with a Progress Bar inside. This Service is started when i open the Main Activity and works fine. But, when i close Main Activity (onDestroy() is called) the Notification is like refreshed. This is the code of my Service.
#Override
public void onCreate() {
super.onCreate();
Mypreferences prefs = new Mypreferences(this);
String minutes = prefs.getStringValueOf("Minutes");
final NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
final NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
d = Integer.valueOf(minutes)*60;
builder.setSmallIcon(R.drawable.ic_action_about);
builder.setContentTitle(getString(R.string.app_name));
new Thread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<d;i++) {
builder.setProgress(d, d-i, false);
builder.setContentInfo(d-i+"/"+d);
notificationManager.notify(0, builder.build());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}).start();
Integer d it's 60 and countdown works fine but when i close MainActivity if for example ProgressBar is at 40, return to 60. Why? How can i solve?
Service code
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
super.onCreate();
pref = new SharedPref(this);
map = pref.getAllPrefs();
boolean delay = pref.loadBooleanPref("delay");
String delayTime = pref.loadStringValue("DelayTime");
if(delay && delayTime != null) {
new CountDownTimer(TimeUnit.MINUTES.toMillis(Long.valueOf(delayTime)), 1000) {
#Override
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
}
#Override
public void onFinish() {
// TODO Auto-generated method stub
getInfo();
}
}.start();
} else {
getInfo();
}
}

How to use AIDL services for updating counter value?

I am new to android. I am trying using AIDL.
What I am tryng is take initial value i.e 0 from the Textview and tryng to increment its value by calling a method defined in aidl file(using service.)
But the TextView is not updating on button click.
Kindly Help.
Here is my code.
CounterService.aidl
package com.example.counter;
interface CounterService {
int updateCounter(in int var);
}
CounterServ.java (Exposing service)
package com.example.counter;
public class CounterServ extends Service {
#Override
public void onCreate() {
super.onCreate();
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return new CounterService.Stub() {
#Override
public int updateCounter(int var) throws RemoteException {
// TODO Auto-generated method stub
return var + 1;
}
};
}
#Override
public void onDestroy() {
super.onDestroy();
}
}
User Activity using service.
public class MainActivity extends Activity {
CounterService myservice;
AdditionServiceConnection connection;
class AdditionServiceConnection implements ServiceConnection {
public void onServiceConnected(ComponentName name, IBinder Service) {
myservice = CounterService.Stub.asInterface(Service);
Toast.makeText(MainActivity.this, "Service connected", Toast.LENGTH_LONG)
.show();
}
public void onServiceDisconnected(ComponentName name) {
myservice = null;
Toast.makeText(MainActivity.this, "Service connected", Toast.LENGTH_LONG)
.show();
}
}
private void initService() {
connection = new AdditionServiceConnection();
Intent i = new Intent();
i.setClassName("com.example",com.example.counter.MainActivity.class.getName());
boolean ret = bindService(i, connection, Context.BIND_AUTO_CREATE);
}
private void releaseService() {
unbindService(connection);
connection = null;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initService();
Button update = (Button)findViewById(R.id.button1);
update.setOnClickListener(new View.OnClickListener() {
TextView value=(TextView)findViewById(R.id.textView1);
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
int val,res=-1;
val=Integer.parseInt(value.getText().toString());
try{
res=myservice.updateCounter(val);
}
catch(Exception e)
{e.printStackTrace();}
value.setText(res);
}
});
}
protected void onDestroy() {
releaseService();
}
}

Convert res into text format by applying following code and try
String str = String.valueOf(res);
value.setText(str);

I got where I was lacking. I didnt register this service in the menifest file and therefore was not able to use it.

Application is repeatedly opened

I'm developing an application. When i exit from the application, it will be opened again (The first activity is called again and again). So i couldn't able to exit from it.
In some other activities I use EXIT button and proper code to exit. Even when I click the EXIT button on those activities, it will start login activity. (login page is opened)
In my application, I use
1) Main
2) ScreenActivity
3) Login
flow: (from main->screenActivity->login)
The start page (1st activity) is posted below
public class main extends Activity {
static ConnectivityManager conMgr;
BackgroundThread backgroundThread;
TextView myText;
boolean myTextOn = true;
Cursor cursor;
String response="";
public SQLiteAdapter mySQLiteAdapter;
private SQLiteDatabase sqLiteDatabase;
SimpleCursorAdapter cursorAdapter;
public class BackgroundThread extends Thread {
boolean running = false;
void setRunning(boolean b){
running = b;
}
#Override
public void run() {
// TODO Auto-generated method stub
//super.run();
while(running){
try {
sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch(Exception e)
{
}
handler.sendMessage(handler.obtainMessage());
}
}
}
Handler handler = new Handler(){
#Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
//super.handleMessage(msg);
if (myTextOn){
myTextOn = false;
myText.setVisibility(View.GONE);
}
else{
myTextOn = true;
myText.setVisibility(View.VISIBLE);
}
}
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.thread);
myText = (TextView)findViewById(R.id.mytext);
}
#Override
protected void onStart() {
conMgr = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
// TODO Auto-generated method stub
super.onStart();
if(isInternetAvailable())
{
Toast.makeText(this, "online", Toast.LENGTH_LONG).show();
startActivity(new Intent(main.this, ScreenActivity.class));
}
else{
startActivity(new Intent(main.this, splashscreen.class));
Toast.makeText(this, "offline", Toast.LENGTH_LONG).show();
}
backgroundThread = new BackgroundThread();
backgroundThread.setRunning(true);
backgroundThread.start();
}
private boolean isInternetAvailable() {
ConnectivityManager cm=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
boolean retry = true;
backgroundThread.setRunning(false);
while(retry){
try {
backgroundThread.join();
retry = false;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch(Exception e)
{
}
}
}
public void onDEstroy()
{
super.onDestroy();
}
}
ScreenActivity:
public class ScreenActivity extends Activity implements AnimationListener {
private TextView animatedView3;
//ImageView image;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
/* Animation animation1 = AnimationUtils.loadAnimation(this,
R.anim.anima);
animation1.setAnimationListener(this);
View animatedView1 = findViewById(R.id.aet1);
animatedView1.startAnimation(animation1);
/** set time to splash out */
final int welcomeScreenDisplay = 9000;
/** create a thread to show splash up to splash time */
Thread welcomeThread = new Thread() {
int wait = 0;
#Override
public void run() {
try {
super.run();
/**
* use while to get the splash time. Use sleep() to increase
* the wait variable for every 100L.
*/
while (wait < welcomeScreenDisplay) {
sleep(100);
wait += 100;
}
} catch (Exception e) {
System.out.println("EXc=" + e);
} finally {
/**
* Called after splash times up. Do some action after splash
* times up. Here we moved to another main activity class
*/
startActivity(new Intent(ScreenActivity.this,
login.class));
}
}
};
welcomeThread.start();
}
public void onAnimationStart(Animation animation) {
}
public void onAnimationEnd(Animation animation) {
//Toast.makeText(this, "Animation ended", Toast.LENGTH_SHORT).show();
if (animatedView3.getVisibility() == View.VISIBLE) {
animatedView3.setVisibility(View.INVISIBLE);
} else {
animatedView3.setVisibility(View.VISIBLE);
}
}
public void onAnimationRepeat(Animation animation) {
// Toast.makeText(this, "Animation rep", Toast.LENGTH_SHORT).show();
}
}
Please can anyone explain about the problem and how to solve it? I didn't understand.

Place finish() in your loginActivity and for other Activities as well else stack will store the list of visited Activities.