My requirement is that when user clicks the home button at any screen in application, he is redirected to device home screen and when he comes back to the application he will redirect to app home screen rather than at screen where he pressed the home button.
Any help would be appreciaed.
As you said that you want to go Home Screen when you press Home button from any Screen. So you better take a BaseActivity extending Activity and inside that override onKeyDown() as below.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_HOME:
// Implement starting Home Activity with Clear Top
return true;
}
}
return super.onKeyDown(keyCode, event);
}
Then Extend all your activities with BaseActivity instead of Activity. So that Every Activity get onKeyDown() Functionality so that any where you press Home Button it navigates back to HomeScreen with removing all Activities.
Here is some code you can use to detect Home-Button pushes and call appropriate functions.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_HOME:
finish();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
or
In android manifest do setting android:noHistory="true" on the activity,this will remove an activity from the stack whenever it is not there in foreground.
Related
My app is currently stuck in an endless loop with the physical back button. The program is set up to load a splash screen and then transition to a main menu. Once at the main menu the user can switch to another activity of their choice. For example: The new game activity. Once the user is at the new game activity I want them to be able to hit the back button and have it take them to the main menu. Once back at the main menu, if they hit the back button again I would like it to exit the game.
This is what I am using for each activity:
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
startActivity(new Intent(NewGameActivity.this, MenuActivity.class));
}
return super.onKeyDown(keyCode, event);
}
It works properly and takes the user back to the main menu without a problem. But if the user hits the back button again once at the main menu it will take them to the screen they just escaped from. So it just loops back to the previous screen every time.
This is how the main menu is set up:
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
stopService(new Intent(MenuActivity.this, BGMusicService.class));
MenuActivity.this.finish();
}
return super.onKeyDown(keyCode, event);
}
If I press the back button as soon as the main menu loads the first time it will work properly and close the game. It only messes up if I've hit the back button previously to get from one screen to the main menu.
Update:
Okay that kind of worked. When I hit the back button at the main screen the music stops and it acts like it's trying to close the app but it flashes back to the main screen again. I have to hit it twice every time.
You should call finish() inside the onKeyDown method of your activities so your current activity is actually removed from the stack.
Something like this should work:
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_BACK)
{
startActivity(new Intent(NewGameActivity.this, MenuActivity.class));
finish();
}
return super.onKeyDown(keyCode, event);
}
First (from comments) add return true; within the if statements (to indicate that you have handled the event), like so:
// Main menu code
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
stopService(new Intent(MenuActivity.this, BGMusicService.class));
MenuActivity.this.finish();
return true; // Add me!
}
return super.onKeyDown(keyCode, event);
}
Additionally, I believe because you're "starting" the menu activity again, you have to clear the back stack (the order of activities used so far) before opening it. You should be able to achieve this using Intent.FLAG_ACTIVITY_CLEAR_TOP (or maybe Intent.FLAG_ACTIVITY_CLEAR_TASK). Something like this:
// Other activity code
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
Intent menuIntent = new Intent(NewGameActivity.this, MenuActivity.class);
menuIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // Add me!
startActivity(menuIntent);
return true; // Add me, too!
}
return super.onKeyDown(keyCode, event);
}
You haven't called finish() in your other activities so when you call finish() on the menu it just closes itself and the other activity is exposed
How to catch event with hardware back button on android ? I need to supress user to go back and I when click on back button on phone to show message and not to go on previous activity. How to do that ?
you can do by this
override the onBackPressed() method into your Activity like this way
public void onBackPressed(){
// do something here and don't write super.onBackPressed()
}
override the onKeyDown() method
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch(keyCode){
case KeyEvent.KEYCODE_BACK:
// do something here
return true;
}
return super.onKeyDown(keyCode, event);
}
Override the method onBackPressed() in whatever Activity you want to create a different behaviour to the back button.
These question are equal to yours (and could have been found by a simple search):
how to disable back button in android
Disable back button in android
You can suppress user "back" action with onKeyDown() in your activity like this:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK))
{
//do actions like show message
return false;
}
return super.onKeyDown(keyCode, event);
}
I am creating an Android application in my application all Activities (pages) have a Back button so by pressing I can go to previous page or another page.For going on another page I use startActivity() and finish().But when I press keyboard's Back Button it goes to page which was previously pushed in Activities Stack.And I want to synchronize Keyboard's Back button and My Activities Back button.
How can I do this Please Help..
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK)
{
//start youractivity or finish();
}
return super.onKeyDown(keyCode, event);
}
override this method on your activity
Can I ignore the previous stage of application after tapping Home button in android?
So that I can get the application from initial screen.
Use like this.If now you are in LastActivity and you want to go back to the First Activity and there is more activity in between then if you want to go first from last use
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(autoSearch)
if (keyCode == KeyEvent.KEYCODE_HOME) {
Log.d("click","HOMEButtonclicked");
LastActivity.this.startActivity(new Intent(LastActivity.this, FirstActivity.class));
moveTaskToBack(false);
return true;
}
return super.onKeyDown(keyCode, event);
}
How do I have an app return to the 'Home' screen when the user is on a different class and they click the back/return button on their phone?
Right now, when they access a different class and hit the back button, it goes back to the Home screen on the Droid rather than the Home screen on the app - how do I get it to go back to the Home Screen on the app?
Thanks!
Use OnBackPressed() method of Activity class.
Make conditions like :
public void onBackPressed(){
if(conditon)
{
detailInfoList.setVisibility(View.VISIBLE);//or anything that you want to show
}
}
you can't,
the home button is the only you can't prevent form closing your app. Its done so that you can't block the user inside your applications (like a virus).
the other keys like back menu and research are possible
in your activity
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
if(keyCode == 82){
Log.i("jason","released on menu");
//change view
//return so that the other behavior (leaving the activity) is not tirggered
return false;
}
}
Log.i("jason","actual key code "+keyCode);
return super.onKeyDown(keyCode, event);
}