onBackPressed to hide Not destroy activity

Question

i know how to cancel back keypress, so that the activity / main window stays visible:

public void onBackPressed() {     return;              } 

my aim is to hide the activity, however, without finishing it, how do you do that in the onBackPressed event?

i.e. I would like to get as far as onPause(), but not evoke the onBackPressed() default behaviour that essentially calls finish(). another way to put it is that i would like to mimic onUserLeaveHint() ?

any help appreciated!

Answer 1

If you want to mimic the "Home" button on specific Activities just do this:

Below API 5:

@Override public boolean onKeyDown(int keyCode, KeyEvent event) {     if (keyCode == KeyEvent.KEYCODE_BACK) {         moveTaskToBack(true);         return true;     }     return super.onKeyDown(keyCode, event); } 

Above and on API 5:

@Override public void onBackPressed() {   moveTaskToBack(true); } 

It will move the Task to background.. when you return, it will be as it was.

You can see more information about this here: Override back button to act like home button

Answer 2

If you want to mimic the "Home" button on specific Activities :

1st Method :

@Override public void onBackPressed() {    Log.d("CDA", "onBackPressed Called");    Intent setIntent = new Intent(Intent.ACTION_MAIN);    setIntent.addCategory(Intent.CATEGORY_HOME);    setIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    startActivity(setIntent); } 

2nd Method :

@Override public void onBackPressed() {    moveTaskToBack(true); } 

And if you want to move to the previous activity without destroying current :

@Override public void onBackPressed() {     startActivity(new Intent(CurrentActivity.this, DestinationActivity.class); } 

And now from any activity if you want to open the activity which is in Background . I name CurrentActivity. you could call it form anywhere..like..it wil take that actvity and put it to top of stack . and open it where you left off.

Intent intent = new Intent(FromAnyActivity.this, CurrentActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); startActivity(intent); 

Flags :

FLAG_ACTIVITY_REORDER_TO_FRONT : To reorder the activity from stack

FLAG_ACTIVITY_CLEAR_TOP : To remove all the activities from the top