In my application,it requires to start the application from the starting activity or the first activity;as the application is authenticated by a login section..
So,whenever the application gets exit;say,via pressing BACK or HOME button,i need to start the application from the login itself...Is there any method to do the same?
I tried a simple technique by overriding the KEYEVENT,and implementing the finish() method inside.It works for the the BACK button;but its not working for the HOME button...
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_HOME) {
finish();
}
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return false;
}
take a look at this:
activity lifecycle
basically, everytime your application gets paused, you close the activity so it has to be restarted again. You can do this by overriding the onPause method and closing the activity there
If I'm not mistaken, one can not override the HOME-button, as it should enable the user to back out of an app at any given point.
when HOME Key Pressed onStop is called so you can add finish(); in onStop() for destory Activity and you can try to use onUserLeaveHint() this method also called when user press Home key
Ya got the answer...
I just included the following attribute for the first activity to be displayed all the time,as i said in my question...
android:launchMode="singleTask"
android:clearTaskOnLaunch="true"
also include this attribute for the other activities...
android:finishOnTaskLaunch="true"
Just try......
Related
In my app, when I click on the home button, I wish to clear the activity stack if the home button is pressed. Could anyone please help me. Lets say there are 2 activities Activity A and Activity B.
If we click the home button from Activity B, and relaunch app, I wish to launch the app from Activity A but it is resuming from Activity B. Could anyone please help me resolving this issue.
Just call finish() in your Acitivity B onPause() method.
Try Adding the tag android:clearTaskOnLaunch="true" in your manifest for activity A to have the launcher always go to that activity.
Care with the accepted answer, if you rotate your device or another app takes foreground, your View will be destroyed because onPause() method will be called. If you want to destroy your activity by only tapping Home button I recommend this:
#Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.KEYCODE_HOME){
finish();
} else
return super.onKeyDown(keyCode, event);
}
I am developing an application in API level 2.2. In my application whenever I press Home button it forces my app to exit, and when I relaunch that app by clicking on its icon, it starts from where it exited. I have tried to change/ override functionality of Home button but it does not works.
I have tried as
`
public boolean onKeyDown (int keyCode, KeyEvent event){
if (keyCode == KeyEvent.KEYCODE_BACK)
{
startActivity(new Intent(CategoryFirstActivity.this,LastActivity.class));
finish();
}
else if (keyCode == KeyEvent.KEYCODE_HOME)
{
startActivity(new Intent(CategoryFirstActivity.this,LastActivity.class));
finish();
}
return false;
}`
But it works for Back button only and not for Home button.
I have also tried to get keyCode of Home key but I didn't get it.
I need solution to change Home Button functionality.
Simply put: better you do not change the behavior of your home button...
Instead of trying to reprogram your Home button, you could try using some of the Activity callbacks that Android provides. You can take a look at the Activity lifecycle here:
http://developer.android.com/reference/android/app/Activity.html
For example, you could try overriding the onPause callback in an effort to achieve the effect you're going for.
#Override
public void onPause() { /* do stuff */ }
In your case, do stuff might be returning the application to its initial state or forcing it to exit. I've never attempted a force quit myself, but there are some answers on this StackOverflow post:
How to exit from the application and show the home screen?
Best of luck!
I'd like to destroy my application when the user touches the home button of Android device and begin the MainActivity when the user touches the "back" button of Android.
Does any ones knows how to do that?
For close app on Back
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK :
finish();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
And You can't get click event of Home Button so you want to code onStop method.
#Override
protected void onStop() {
finish();
super.onStop();
}
System.exit(0)
But it's best not to use it. Android isn't designed for this purpose.
Close application and launch home screen on Android
You can do this by calling the finish() and finishActivity() methods. checkout the details on API guide Shutting down an Activity. From where to call these methods is based on how your application is implemented, but I guess you can do this from the current focused activity by listening to KeyEvent and filtering on Home button key event.
However you need to consider that once you have killed your activities pressing the back button will not get you back to your application activity since killing the activities will wipe them out of memory stack.
Also check out the Activity life cycle diagram and detailed description given on Android Developers site.
You can close an Activity by calling finish(), but you'll have to do that for each Activity that is open. To have this happen upon pushing the HOME button, you'll have to register a KeyEvent. I'm not too clear on how to do this, but you can find documentation here.
call finish() in your onStop() method. Or use android:noHistory="true" in your manifest.
we used back key by calling
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
moveTaskToBack(true);
return true;
}
return super.onKeyDown(keyCode, event);
}
but,we used 4 classes in our application.if we gives back button,its working well and returning to application home page.but wen we go next time its in same class.(we used above back key coding in 3 rd class,its remains same page).
is there any alternative method.if anybody knows pls reply.
moveTaskToBack() only moves the Activity to the back of the activity stack, it doesn't actually close the Activity. What you want is finish(), which will close the Activity and Android will automatically take you back to the previous Activity in the stack.
For more information, see the documentation: http://developer.android.com/guide/topics/fundamentals.html#acttask
Try overriding onBackPressed()
use this...
onBackPressed not close Current Activity In Android
I having problem in my application.. I am pressing back button in my third activity but its running in running in background(i noticed by used Log statement). If again load application its starts from first activity instead of third activity. please suggest some idea to do this..
This is my back button coding
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_BACK)
{
moveTaskToBack(true);
}
return true;
}
Thanks in advance..
The back button pauses your current activity and pop it from the activity stack, so the previous activity will be shown. You don't have and in most cases you just shouldn't override this behaviour.
Basicly, if you're in your third activity and you press the home button, then relaunch the application the third activtiy will be shown.
Please, refer to Activity lifecycle.
When you are in your third activity and then press home button. The next time if you want your activity to start from the third activity, Long press the home button and then invoke the application from this list rather than launching it from launcher activity.