I want to implement the function : if user dosen't checked the autoLogin CheckBox, clear the login user information and logout when the application is quit normally or force closed(clean the memeory).
I write the code clearAutoStart() to clear user information both in finish() and OnDestory().
When the user press back button twice, the finish() will execute, and will logout success. But as you know, if the application force closed, OnDestory() will not execute all the time. So in this situation, it will not logout success.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
exitBy2Click(); //quit normal
}
return false;
}
private static Boolean isExit = false;
private void exitBy2Click() {
Timer tExit = null;
if (isExit == false) {
isExit = true;
Toast.makeText(this, "press again to quit", Toast.LENGTH_SHORT).show();
tExit = new Timer();
tExit.schedule(new TimerTask() {
#Override
public void run() {
isExit = false;
}
}, 2000);
} else {
finish();
System.exit(0);
}
}
#Override
protected void onDestroy() {
clearAutoStart();
super.onDestroy();
}
#Override
public void finish() {
clearAutoStart();
super.finish();
}
#Override
protected void onStop() {
Log.i("ws", "---->>SmarterActivity onStop");
super.onStop();
}
public void clearAutoStart() {
RememberUser rememberUser = RememberUser.getInstance();
if (rememberUser.getIsAutoStart() == false) {
Log.i("ws", "---->>clearAutoStart getIsAutoStart false ");
UserLocalStore userLocalStore = UserLocalStore.getInstance();
userLocalStore.setUserLoggedIn(false);
userLocalStore.clearUserData();
Log.i("ws", "---->>clearAutoStart getIsAutoStart false OK ");
} else {
Log.i("ws", "---->>clearAutoStart getIsAutoStart true ");
}
}
I try to add the clearAutoStart() in onStop(), but this means if I press the HOME button , the application will logout.
When you press HOME onPause() is called and then onStop().
So you can put a member variable that keep the track of what is happening:
#Override
protected void onPause() {
mIsPause = true;
super.onPause();
}
#Override
protected void onStop() {
Log.i("ws", "---->>SmarterActivity onStop");
if(!mIsPause)
clearAutoStart();
super.onStop();
}
Related
I want to execute a function only when returning to the Application from the background.
I have included the method in onResume, and this does it to a certain extent. Problem is since onResume is fired even on creating the Activity and when returning to the activity from another activity (Ex: From pressing the back button), and the function is executed there as well.
How to avoid this and execute the function only when returning from background?
Ps: My application already has multiple places using startActivity so changing to startActivityForResult is a tedious task.
Also all my Activities are extending from a common BaseAppCompactActivity class and it's where my method is located, so this will apply to the whole application.
Edit 2:
My BaseAppCompactActivity is as below with LifecycleObserver implemented now. This doesn't seem to work though.
public class BaseAppCompactActivity extends AppCompatActivity implements LifecycleObserver {
private String TAG = BaseAppCompactActivity.class.getSimpleName();
#Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
}
#Override
protected void onPause() {
super.onPause();
stopService();
}
#Override
protected void onPostResume() {
super.onPostResume();
startService();
}
// #Override
// protected void onResume() {
// super.onResume();
//// updateLastAccessedDate();
// }
private void startService() {
startService(new Intent(this, BusinessCacheService.class));
}
private void stopService() {
stopService(new Intent(this, BusinessCacheService.class));
}
#OnLifecycleEvent(Lifecycle.Event.ON_START)
private void updateLastAccessedDate() {
//Do something
}
}
Although its a duplicate . Here is a Java implementation i am sharing for sake of help ..
public class MyApplication extends MultiDexApplication implements LifecycleObserver {
private boolean previouslyInBackground;
#Override
public void onCreate() {
super.onCreate();
ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
}
#OnLifecycleEvent(Lifecycle.Event.ON_STOP)
void onAppBackgrounded() {
previouslyInBackground=true;
}
#OnLifecycleEvent(Lifecycle.Event.ON_START)
void onAppForegrounded() {
if(previouslyInBackground){
// Do your stuff Here
}
previouslyInBackground=false;
}
}
Add the Gradle dependency from Lifecycle-aware components Documentation
You can use startActivityForResult instead of startActivity.
Then you can catch the returning inside onActivityResult method.
first set a global boolean variable like this:-
boolean isPaused = false;
now set a methods in your activity :-
#Override
protected void onUserLeaveHint() {
isPaused = true;
super.onUserLeaveHint();
}
or in your onResume method:-
#Override
protected void onResume() {
if(isPaused){
isPaused = false;
}
super.onResume();
}
Do like this
add these variable in your main activity
public static boolean isAppWentToBg = true;
public static boolean isWindowFocused = false;
public static boolean isBackPressed = false;
and also add these methods
private void applicationWillEnterForeground() {
if (isAppWentToBg) {
isAppWentToBg = false;
// Toast.makeText(getApplicationContext(), "App is in foreground", Toast.LENGTH_SHORT).show();
}
}
public void applicationdidenterbackground() {
if (!isWindowFocused) {
isAppWentToBg = true;
// Toast.makeText(getApplicationContext(), "App is Going to Background", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onBackPressed() {
isBackPressed = true;
Log.d(TAG, "onBackPressed " + isBackPressed + "" + this.getLocalClassName());
super.onBackPressed();
}
#Override
public void onWindowFocusChanged(boolean hasFocus) {
isWindowFocused = hasFocus;
if (isBackPressed && !hasFocus) {
isBackPressed = false;
isWindowFocused = true;
}
super.onWindowFocusChanged(hasFocus);
}
#Override
protected void onStart() {
Log.d(TAG, "onStart isAppWentToBg " + isAppWentToBg);
applicationWillEnterForeground();
super.onStart();
}
#Override
protected void onStop() {
super.onStop();
Log.d(TAG, "onStop ");
applicationdidenterbackground();
}
What I would suggest is create a new boolean variable which say if that is created for the first time in resume and work on it.
Boolean isForeGround = true;
#Override
public void onPause() {
super.onPause();
isForeGround = false;
}
#Override
public void onResume() {
super.onPause();
if(!isForeGround){
isForeGround = true;
// write your code here
}
}
I want to exit the app only when double tap continously. I am using fragment class. I used the below code but doesn't work
private long lastPressedTime;
private static final int PERIOD = 2000;
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
switch (event.getAction()) {
case KeyEvent.ACTION_DOWN:
if (event.getDownTime() - lastPressedTime < PERIOD) {
finish();
} else {
Toast.makeText(getApplicationContext(), "Press again to exit.",
Toast.LENGTH_SHORT).show();
lastPressedTime = event.getEventTime();
}
return true;
}
}
return false;
}
please guide me how to implement this in an app.
#Override
public void onBackPressed() {}
in your activity, because activity responsible for back button handling
Look to this question, it has not got an accepted answer, but contain some solutions
Remove your implementation inside onKeydown and try this code
#Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000);
}
try this :
private boolean doubleBackToExitPressedOnce;
#Override
public void onBackPressed() {
Log.i(tag, "Start: On Back Pressed!");
if (doubleBackToExitPressedOnce) {
Log.i(tag, "Double Back Pressed!");
super.onBackPressed();
return;
}
doubleBackToExitPressedOnce = true;
Toast.makeText(this, R.string.msg_exit, Toast.LENGTH_SHORT).show();
Timer t = new Timer();
t.schedule(new TimerTask() {
#Override
public void run() {
doubleBackToExitPressedOnce = false;
}
}, 2500);
}
dont forget to add this line in onResume:
#Override
protected void onResume() {
doubleBackToExitPressedOnce = false;
}
I have a splash activity that is displayed for 2 seconds before opening the main activity.
If the user presses the back button while the splash activity is being displayed, the splash activity closes. But a short time later, the main activity [which was triggered by the splash activity] opens up.
I don't want this to happen. I want the entire application to close if the back button is pressed while the splash screen is being displayed.
How do I accomplish this?
Edit:
below is my code for splash activity:
public class Splash2 extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// fullscreen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// fading transition between activities
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
setContentView(R.layout.activity_splash2);
Thread timer = new Thread() {
public void run() {
try {
sleep(1500);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
Intent open = new Intent(
"com.example.puzzletimer.HOMESCREEN");
startActivity(open);
}
}
};
timer.start();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
}
Just add this code to your SplashActivity...
#Override
public void onBackPressed() {
super.onBackPressed();
android.os.Process.killProcess(android.os.Process.myPid());
}
or maintain one flag to determine to start Activity or not in Thread...
public class Splash2 extends Activity {
private volatile boolean interrupt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// fullscreen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// fading transition between activities
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
setContentView(R.layout.activity_splash2);
Thread timer = new Thread() {
public void run() {
try {
sleep(1500);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
if (!interrupt) {
Intent open = new Intent(
"com.example.puzzletimer.HOMESCREEN");
startActivity(open);
}
}
}
};
timer.start();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
#Override
public void onBackPressed() {
super.onBackPressed();
interrupt = true;
}
}
Try this-
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
// do something on back.
this.finish();
return true;
}
return super.onKeyDown(keyCode, event);
}
Another way to do it is with runnable:
Declare Handler and Runnable in your Splash2 activity:
private Handler handler;
private Runnable startMain;
In onCreate(), initialize them and set the runnable to fire in 1.5 secs:
handler = new Handler();
startMain = new Runnable() {
#Override
public void run() {
Intent open = new Intent("com.example.puzzletimer.HOMESCREEN");
startActivity(open);
}
};
handler.postDelayed(startMain, 1500);
Override onBackPressed() and simply cancel runnable:
#Override
public void onBackPressed() {
handler.removeCallbacks(startMain);
super.onBackPressed();
}
That's it. If back key is pressed, it cancels runnable and your homescreen won't run.
I know this question have been asked many times around here, but i didn't find the propert answer for my issue.
this code can disable back button:
#Override
public void onBackPressed() {
// Do Here what ever you want do on back press;
}
but is there anyway that i can disable back button for a temporary time,not for the whole Activity ?
nice answer by Dixit. Just another option
public boolean onKeyDown(int keyCode, KeyEvent event) {
boolean result = false;
if (keyCode == KEYCODE_BACK) {
if (condition) {
result = true;
}
}
return result;
}
N.B ..
it will work on ancient version also
returning true from onKeyDown consumes the default behavior
You have to set on boolean flag where you have to require disable back button set flag value true;
In onBackPressed() you have to put condition as per #Dixit says
#Override
public void onBackPressed() {
if(condition to check){
// this block disable back button
}else{
// this block enable back button
super.onBackPressed();
}
}
If you want to disable backbutton for certain time use this,
//for 5 sec = 5000
countDownTimer = new CountDownTimer(5000,1000) {
#Override
public void onTick(long millisUntilFinished) {
txtWait.setTextColor(getResources().getColor(R.color.errorcolor));
txtWait.setText("Wait( " + millisUntilFinished / 1000+" sec)");
onBackPressed();
}
#Override
public void onFinish() {
YourActivityName.super.onBackPressed();
}
}.start();
And in the override method:
#Override
public void onBackPressed() {
//super.onBackPressed(); commented this to disable the back press
}
Full working code:
YourActivity extends AppCompatActivity{
boolean isBackButtonDisabled = false;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState)
setContentView(R.layout.somelayout);
disableBackButton(4000); //<--Back button is disabled
}
#Override
public void onBackPressed(){
if(!sBackButtonDisabled){
super.onBackPressed();
}
}
private void disableBackButton(final int timeInMilis){
if(!isBackButtonDisabled) {
isBackButtonDisabled = true; //<-- Keep it outside Thread code
Thread t = new Thread(new Runnable() {
#Override
public void run() {
try {
Thread.sleep(timeInMilis);
} catch (InterruptedException e) {
} finally {
isBackButtonDisabled = false;
}
}
});
t.start();
}
}
}
Note: You can use disableBackButton(time) in other scenarios as well. For example Button click. If
you click button multiple times the Thread will only run once. Because in this code
isBackButtonDisable variable is thread-safe "in a way".
In the app i m looking for the users location using gps.In the Async pre execute method i m showing a toast.I want that while i show that toast the back button should be disabled
aftr the location is found i want to enable the back button in the post execute!
to disable the back button i have used.But this is not working
OnKeyListener mainScreenKeyListener = new OnKeyListener() {
#Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
boolean disableEvent = false;
if (event.getKeyCode()==KeyEvent.KEYCODE_BACK) {
disableEvent = true;
}
return disableEvent;
}
};
You can declare global variable disableEvent by
final boolean disableEvent;
Your Preexecute method can set it to false by
disableEvent = false;
Your Postexecute method can set it to true by
disableEvent = true;
You can override onBackPressed as shown below:
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (disableEvent)
{
// do nothing
}
else
{
// do something
}
}
Here you go
Assign one static variable.and set its value to "NO" in onPreExecute.
in onPostExecute assign its value to "YES".
And write following code in your onBackPressed.
#Override
public void onBackPressed() {
if (decision.equals("NO")) { //Here no means dont allow user to go back
} else {
super.onBackPressed(); // Process Back key default behavior.
}
}
hi for disable you simply call the above function
public void onBackPressed()
{
}
for enable
public void onBackPressed()
{
super.onBackPressed();
super.finish();
//Intent
}
if you want both set flag inside the function
override onBackPress method in your activity
Class A
{
public static boolean isToastShown=false;
#Override
public void onBackPressed() {
if(isToastShown==true)
return false;
else
super.onBackPressed();
}
}
#Override
protected void onPreExecute() {
super.onPreExecute();
//Show your toast here
A.isToastShown=true;
new CountDownTimer(2000,2000) {
#Override
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
}
#Override
public void onFinish() {
A.isToastShown=false;
}
}.start();
}