Detect home button press in android

Question

This has been driving me nuts for a while now    Is there any way of reliably detecting if the home button has been pressed in an android application   Failing that  is there a robust way of telling what caused an activity to go into onPause  i e Can we detect if it was caused by a new activity launching or by pressing back home   One suggestion I have seen is to override onPause   and call isFinishing   but this will return false when pressing the home button just as it would if a new activity is starting so this fails to distinguish between the two   Any help much appreciated      Update     Thanks to  android-hungry for this link  https   nishandroid blogspot com   Overiding the following method    Override public void onAttachedToWindow         super onAttachedToWindow        this getWindow   setType WindowManager LayoutParams TYPE KEYGUARD                  Then the following event WILL get fired for home button presses    Override public boolean onKeyDown int keyCode  KeyEvent event              if keyCode    KeyEvent KEYCODE HOME                 The Code Want to Perform               I m not sure if there are any side effects with this line   this getWindow   setType WindowManager LayoutParams TYPE KEYGUARD        So it would seem that contrary to popular belief  you can in fact listen out for the home key  Worryingly  you can return false and have the home key do nothing   Update  As expected  there are some side affects with this - it seems that embedded videos and google maps are not visible with this mode enabled   Update  Supposedly this hack no longer works as of Android 4 0 onwards

User · Answer

It s a bad idea to change the behavior of the home key  This is why Google doesn t allow you to override the home key  I wouldn t mess with the home key generally speaking  You need to give the user a way to get out of your app if it goes off into the weeds for whatever reason   I d image any work around will have unwanted side effects

User · Answer

An option for your application would be to write a replacement Home Screen using the android intent category HOME Intent  I believe this type of Intent you can see the home button   More details    http   developer android com guide topics intents intents-filters html imatch

User · Answer

Since you only wish for the root activity to be reshown when the app is launched  maybe you can get this behavior by changing launch modes  etc  in the manifest   For instance  have you tried applying the android clearTaskOnLaunch  true  attribute to your launch activity  perhaps in tandem with android launchMode  singleInstance    Tasks and Back Stack is a great resource for fine-tuning this sort of behavior

User · Answer

You might consider a solution by Andreas Shrade in his post on How-To Create a Working Kiosk Mode in Android  It s a bit hacky  but given the reasons that interception of the home button is prevented it has to be

User · Answer

Following code works for me       HomeWatcher mHomeWatcher   new HomeWatcher this   mHomeWatcher setOnHomePressedListener new OnHomePressedListener          Override     public void onHomePressed                do something here               Override     public void onHomeLongPressed               mHomeWatcher startWatch        import android content BroadcastReceiver  import android content Context  import android content Intent  import android content IntentFilter  import android util Log   public class HomeWatcher        static final String TAG    hg       private Context mContext      private IntentFilter mFilter      private OnHomePressedListener mListener      private InnerReceiver mReceiver       public HomeWatcher Context context            mContext   context          mFilter   new IntentFilter Intent ACTION CLOSE SYSTEM DIALOGS              public void setOnHomePressedListener OnHomePressedListener listener            mListener   listener          mReceiver   new InnerReceiver               public void startWatch             if  mReceiver    null                mContext registerReceiver mReceiver  mFilter                        public void stopWatch             if  mReceiver    null                mContext unregisterReceiver mReceiver                        class InnerReceiver extends BroadcastReceiver           final String SYSTEM DIALOG REASON KEY    reason           final String SYSTEM DIALOG REASON GLOBAL ACTIONS    globalactions           final String SYSTEM DIALOG REASON RECENT APPS    recentapps           final String SYSTEM DIALOG REASON HOME KEY    homekey             Override         public void onReceive Context context  Intent intent                String action   intent getAction                if  action equals Intent ACTION CLOSE SYSTEM DIALOGS                     String reason   intent getStringExtra SYSTEM DIALOG REASON KEY                   if  reason    null                        Log e TAG   action     action     reason     reason                       if  mListener    null                            if  reason equals SYSTEM DIALOG REASON HOME KEY                                 mListener onHomePressed                              else if  reason equals SYSTEM DIALOG REASON RECENT APPS                                 mListener onHomeLongPressed                                                                                                          public interface OnHomePressedListener       void onHomePressed        void onHomeLongPressed

User · Answer

It is impossible to detect and or intercept the HOME button from within an Android app  This is built into the system to prevent malicious apps that cannot be exited

User · Answer

Since API 14 you can use the function onTrimMemory   and check for the flag TRIM MEMORY UI HIDDEN  This will tell you that your Application is going to the background   So in your custom Application class you can write something like   override fun onTrimMemory level  Int        if  level    TRIM MEMORY UI HIDDEN               Application going to background  do something           For an in-depth study of this  I invite you to read this article  http   www developerphil com no-you-can-not-override-the-home-button-but-you-dont-have-to

User · Answer

Jack s answer is perfectly working for click event while longClick is considering is as menu button click    By the way  if anyone is wondering how to do via kotlin   class HomeButtonReceiver private var context  Context private var listener  OnHomeButtonClickListener        private val mFilter  IntentFilter   IntentFilter Intent ACTION CLOSE SYSTEM DIALOGS      private var mReceiver  InnerReceiver   InnerReceiver        fun startWatch             context registerReceiver mReceiver  mFilter             fun stopWatch             context unregisterReceiver mReceiver             inner class InnerReceiver  BroadcastReceiver             private val systemDialogReasonKey    reason          private val systemDialogReasonHomeKey    homekey          override fun onReceive context  Context   intent  Intent                 val action   intent  action             if  action    Intent ACTION CLOSE SYSTEM DIALOGS                    val reason   intent getStringExtra systemDialogReasonKey                  if  reason    null  amp  amp  reason    systemDialogReasonHomeKey                        listener onHomeButtonClick

User · Answer

onUserLeaveHint     override this activity class method This will detect the home key click   This method is called right before the activity s onPause   callback But it will not be called when an activity is interrupted like a in-call activity comes into foreground  apart from that interruptions it will call when user click home key    Override protected void onUserLeaveHint         super onUserLeaveHint        Log d TAG   home key clicked

User · Answer

Override onUserLeaveHint   in the activity  There will never be any callback to the activity when a new activity comes over it or user presses back press

User · Answer

Try to create a counter for each screen  If the user touch HOME  then the counter will be zero    public void onStart       super onStart      counter       public void onStop       super onStop      counter--        if  counter    0             Do

User · Answer

I had this problem  and since overriding the onKeyDown   method didn t accomplish anything because of the underlying android system didn t call this method  I solved this with overriding onBackPressed    and I had a boolean value set there to false  because I pressed back  let me show you what I mean in code   import android util Log  public class HomeButtonActivity extends Activity       boolean homePressed   false         override onCreate   here        Override     public void onBackPressed             homePressed   false     simply set homePressed to false             Overide     public void onResume             super onResume            homePressed   true     default  other wise onBackPressed will set it to false             Override     public void onPause             super onPause            if homePressed    Log i  homePressed    yay              So the reason why this worked is because the only way to navigate outside this activity is by pressing back or home so if back was pressed then i know the cause wasn t home  but otherwise the cause was home  therefore i set the default boolean value for homePressed to be true  However this will only work with a single activity instance in your application because otherwise you have more possibilities to cause the onPause   method to be called

User · Answer

Recently I was trying to detect the home press button  because I needed it to do the same as the method  onBackPressed     In order to do this  I had to override the method  onSupportNavigateUp    like this   override fun onSupportNavigateUp    Boolean       onBackPressed       return true     It worked perfectly

User · Answer

I needed to start stop background music in my application when first activity opens and closes or when any activity is paused by home button and then resumed from task manager  Pure playback stopping resuming in Activity onPause   and Activity onResume   interrupted the music for a while  so I had to write the following code     Override public void onResume       super onResume          start playback here  if not playing already      Override public void onPause       super onPause       ActivityManager manager    ActivityManager  this getSystemService Activity ACTIVITY SERVICE     List lt ActivityManager RunningTaskInfo gt  tasks   manager getRunningTasks Integer MAX VALUE     boolean is finishing   this isFinishing      boolean is last   false    boolean is topmost   false    for  ActivityManager RunningTaskInfo task   tasks        if  task topActivity getPackageName   startsWith  cz matelier skolasmyku            is last   task numRunning    1        is topmost   task topActivity equals this getComponentName           break               if   is finishing  amp  amp  is last       is finishing  amp  amp  is topmost  amp  amp   mIsStarting         mIsStarting   false         stop playback here         which interrupts the playback only when application  all its activities  is closed or when home button is pressed  Unfortunatelly I didn t manage to change order of calls of onPause   method of the starting activity and onResume   of the started actvity when Activity startActivity   is called  or detect in onPause   that activity is launching another activity other way  so this case have to be handled specially    private boolean mIsStarting    Override public void startActivity Intent intent      mIsStarting   true    super startActivity intent       Another drawback is that this requires GET TASKS permission added to AndroidManifest xml    lt uses-permission   android name  android permission GET TASKS   gt    Modifying this code that it only reacts on home button press is straighforward

User · Answer

This works for me  You can override onUserLeaveHint method https   www tutorialspoint com detect-home-button-press-in-android  Override     protected void onUserLeaveHint                        super onUserLeaveHint

User · Answer

Android Home Key handled by the framework layer you can t able to handle this in the application layer level  Because the home button action is already defined in the below level  But If you are developing your custom ROM  then It might be possible  Google restricted the HOME BUTTON override functions because of security reasons

User · Answer

This is an old question but it might help someone    Override protected void onUserLeaveHint         Log d  onUserLeaveHint   Home button pressed        super onUserLeaveHint        According to the documentation  the onUserLeaveHint   method is called when the user clicks the home button OR when something interrupts your application  like an incoming phone call    This works for me

[android] Detect home button press in android

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