Android How to detect double-tap

Question

I have a problem with implementing double tap  Well I implemented the onGestureListener and I had the gestureDetector  but I m not sure where is the problem  here is my code    public class home extends TabActivity implements OnGestureListener           Called when the activity is first created       private EditText queryText   private ResultsAdapter m adapter   private ProgressDialog pd   final Handler h   new Handler     private TabHost mTabHost   private ArrayList lt SearchItem gt  sResultsArr   new ArrayList lt SearchItem gt      private String queryStr   private JSONObject searchResponse   private GestureDetector gestureScanner    final Runnable mUpdateResults   new Runnable             public void run              updateListUi                        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main            Button search    Button findViewById R id search           Button testButt    Button findViewById R id testbutt           queryText    EditText findViewById R id query           ListView lvr    ListView findViewById R id search results            initialise the arrayAdapter         this m adapter   new ResultsAdapter home this  R layout listrow  sResultsArr           lvr setAdapter this m adapter           lvr setOnItemClickListener new OnItemClickListener        Override    public void onItemClick AdapterView lt   gt  arg0  View arg1  int arg2       long arg3           TODO Auto-generated method stub          pd   ProgressDialog show home this  null  Loading products from server   true  false                              gestureScanner   new GestureDetector this this           gestureScanner setOnDoubleTapListener new OnDoubleTapListener                 public boolean onDoubleTap MotionEvent e                        viewA setText  -     onDoubleTap     -              pd   ProgressDialog show home this  null  Loading products from server   true  false                     return false                              public boolean onDoubleTapEvent MotionEvent e                        viewA setText  -     onDoubleTapEvent     -                      return false                              public boolean onSingleTapConfirmed MotionEvent e                        viewA setText  -     onSingleTapConfirmed     -                      return false                                        initialise tab contents         mTabHost   getTabHost            mTabHost addTab mTabHost newTabSpec  tab1   setIndicator  Home   setContent R id homepage            mTabHost addTab mTabHost newTabSpec  tab2   setIndicator  Search Results   setContent R id tab2            mTabHost setCurrentTab 0              sets the respective listeners         testButt setOnClickListener new View OnClickListener             public void onClick View arg0              if mTabHost getTabWidget   getVisibility    View GONE             mTabHost getTabWidget   setVisibility View VISIBLE                       else            mTabHost getTabWidget   setVisibility View GONE                                          search setOnClickListener new View OnClickListener             public void onClick View arg0             sResultsArr clear             queryStr    http   rose mosuma com mobile query     queryText getText   toString             pd   ProgressDialog show home this  null  Loading products from server   true  false            goSearch                               updates the listUI whenever after receiving the response from the server  public void updateListUi          if sResultsArr size    gt  0                  try       String ptypename       int count       LinearLayout ptypebar    LinearLayout findViewById R id productCat        ptypebar removeAllViews         JSONArray ptypes   searchResponse getJSONArray  ptypes          for int index  0 index  lt  ptypes length   index           JSONObject ptype   ptypes getJSONObject index         count   ptype getInt  count                ptypename   ptype getString  ptypename              add into tab 2 s UI          ImageView icon   new ImageView this         TextView t   new TextView home this         t setText ptypename          count               ptypebar addView t                    catch JSONException e               if m adapter getItems      sResultsArr       ArrayList lt SearchItem gt  a    m adapter getItems         a   sResultsArr               m adapter notifyDataSetChanged         pd dismiss         public void goSearch      mTabHost setCurrentTab 1        separate thread for making http request and updating the arraylist   Thread t   new Thread                public void run                  searchResponse   sendSearchQuery queryStr               try               JSONArray results   searchResponse getJSONArray  results                    this is stupid  i probably have to see how to make a json adapter              for int index  0 index  lt  results length   index                    JSONObject product   results getJSONObject index                    gets the searched products from the json object               URL imgUrl    new URL product getString  image                   String productname   product getString  productname                  String ptypename   product getString  ptypename                  int pid   product getInt  pid                  int positive   product getInt  pos                  int negative   product getInt  neg                  int neutral   product getInt  neu                    SearchItem item    new SearchItem imgUrl productname ptypename neutral positive negative pid                 sResultsArr add item                                            catch JSONException e                              catch Exception e                                   returns back to UI therad             h post mUpdateResults                                 t start           sends a request with qry as URL    and receives back a JSONobject as response  public JSONObject sendSearchQuery String qry     HttpRequest r   new HttpRequest      JSONObject response   r sendHttpRequest qry       return response        Override  public boolean onDown MotionEvent arg0          return gestureScanner onTouchEvent arg0          Override  public boolean onFling MotionEvent arg0  MotionEvent arg1  float arg2     float arg3         TODO Auto-generated method stub   return false        Override  public void onLongPress MotionEvent arg0         TODO Auto-generated method stub        Override  public boolean onScroll MotionEvent arg0  MotionEvent arg1  float arg2     float arg3         TODO Auto-generated method stub   return false        Override  public void onShowPress MotionEvent arg0         TODO Auto-generated method stub        Override  public boolean onSingleTapUp MotionEvent arg0         TODO Auto-generated method stub   return false       Oh  another question  if my ListView has an onItemClickListener  can android detect between single tap or double tap for it

User · Answer

I have implemented a simple custom method using kotlin coroutines  for java can be done via threads    var click   0  view setOnClickListener     click      clicksHandling      fun clicksHandling        if  click    1          launch           delay 300     custom delay duration between clicks            if user didn t double tap then click counter still 1         if  click    1                 single click handling           runOnUiThread                   whatever you wanna do on UI thread                                click   0   reset counter   this will run no matter single   double tap              double click handling    if  click    2                whatever on double click

User · Answer

Thread   Interface   DoubleTapListener   AnyTap listener etc  In this example  I have implemented the DoubleTap Listener with a Thread  You can add my listener with any View object as you do with any ClickListener  Using this approach you can easily pull off any kind of click listener       yourButton setOnClickListener new DoubleTapListener this      1  My Listrener class   public class DoubleTapListener  implements View OnClickListener      private boolean isRunning  false     private int resetInTime  500     private int counter 0     private DoubleTapCallback listener      public DoubleTapListener Context context          listener    DoubleTapCallback context         Log d  Double Tap   New              Override    public void onClick View v            if isRunning             if counter  1                listener onDoubleClick v                    counter            if  isRunning             isRunning true            new Thread new Runnable                   Override              public void run                      try                       Thread sleep resetInTime                       isRunning   false                      counter 0                     catch  InterruptedException e                        e printStackTrace                                                    start                      2  Listener Callback  public interface DoubleTapCallback          public void onDoubleClick View v        3  Implement in your Activity  public class MainActivity extends AppCompatActivity implements DoubleTapCallback   private Button button  private int counter    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main        button      Button findViewById R id button             button setOnClickListener new DoubleTapListener this        Set mt listener      Override public void onDoubleClick View v        counter        textView setText counter           Relevant link   You can see the full working code HERE

User · Answer

You can use the GestureDetector  See the following code   public class MyView extends View        GestureDetector gestureDetector       public MyView Context context  AttributeSet attrs            super context  attrs                      creating new gesture detector         gestureDetector   new GestureDetector context  new GestureListener                   skipping measure calculation and drawing             delegate the event to the gesture detector      Override     public boolean onTouchEvent MotionEvent e            return gestureDetector onTouchEvent e               private class GestureListener extends GestureDetector SimpleOnGestureListener             Override         public boolean onDown MotionEvent e                return true                       event when double tap occurs          Override         public boolean onDoubleTap MotionEvent e                float x   e getX                float y   e getY                 Log d  Double Tap    Tapped at       x         y                      return true                      You can override other methods of the listener to get single taps  flinges and so on

User · Answer

Why aren t you using a Long Press   Or are you using that already for something else   The advantages of a Long Press over a Double Touch    Long Press is a recommeded interaction in the UI Guidelines  Double Touch is not  It s what users expect  a user might not find a Double Touch action as they won t go looking for it It s already handled in the API  Implementing a Double Touch will affect handling of Single Touches  because you ll have to wait to see if every Single Touch turns into a Double Touch before you can process it

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This is a solution that wait if there is a second clic before executing any action    int init   0    myView setOnClickListener new View OnClickListener               Override         public void onClick View v                  if  init    0                    init                    new Handler   postDelayed new Runnable                          Override                     public void run                                if  init    1                                Log d  hereGoes    actionOne                              else                               Log d  hereGoes    actionTwo                                                        init   0                                           250                 else                   init

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My solution  may be helpful   long lastTouchUpTime   0  boolean isDoubleClick   false   private void performDoubleClick         long currentTime   System currentTimeMillis        if  isDoubleClick  amp  amp  currentTime - lastTouchUpTime  lt  DOUBLE CLICK TIME INTERVAL            isDoubleClick   true          lastTouchUpTime   currentTime          Toast makeText context   double click   Toast LENGTH SHORT  show              else           lastTouchUpTime   currentTime          isDoubleClick   false

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This is my solution  it uses default setOnItemClickListener    I had the same task to implement  Soon I ll post example and custom class on my github  Brief explanation is given  I m not sure if the time in milliseconds is right difference for the system  See ViewConfiguration getDoubleTapTimeout   source  to decide between single and double tap         Edit  See it here  https   github com NikolaDespotoski DoubleTapListView or https   github com NikolaDespotoski DoubleTapListViewHandler

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you can implement double-tap using the GestureDetectorCompat class  in this sample when double-tap on textview you can do your logic   public class MainActivity extends AppCompatActivity    GestureDetectorCompat gestureDetectorCompat  TextView textElement    Override protected void onCreate Bundle savedInstanceState                   textElement   findViewById R id textElement       gestureDetectorCompat   new GestureDetectorCompat this  new MyGesture         textElement setOnTouchListener onTouchListener        View OnTouchListener onTouchListener   new View OnTouchListener          Override     public boolean onTouch View v  MotionEvent event            gestureDetectorCompat onTouchEvent event           return true               class MyGesture extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true              Override     public boolean onDoubleTap MotionEvent e               whatever on double click         return true

User · Answer

If you are using Kotlin then you can do it like this   I spend a lot of time to convert this code to Kotlin hope it save someone s time        Create a gesture detector         val gestureDetector   GestureDetector this  object   GestureDetector SimpleOnGestureListener                 override fun onDoubleTap e  MotionEvent   Boolean                    Toast makeText this DemoActivity  Double Tap  Toast LENGTH LONG  show                      Show or hide Ip address on double tap                 toggleIPaddressVisibility                    return true                             override fun onLongPress e  MotionEvent                    super onLongPress e                      rotate frame on long press                 toggleFrameRotation                    Toast makeText this DemoActivity  LongClick  Toast LENGTH LONG  show                              override fun onDoubleTapEvent e  MotionEvent   Boolean                   return true                            override fun onDown e  MotionEvent   Boolean                   return true                            Assign to any of your view           IPAddress setOnTouchListener   v  event - gt            return setOnTouchListener  gestureDetector onTouchEvent event

User · Answer

As a lightweight alternative to GestureDetector you can use this class  public abstract class DoubleClickListener implements OnClickListener        private static final long DOUBLE CLICK TIME DELTA   300   milliseconds      long lastClickTime   0        Override     public void onClick View v            long clickTime   System currentTimeMillis            if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA               onDoubleClick v             else               onSingleClick v                     lastClickTime   clickTime             public abstract void onSingleClick View v       public abstract void onDoubleClick View v       Example       view setOnClickListener new DoubleClickListener               Override         public void onSingleClick View v                         Override         public void onDoubleClick View v

User · Answer

To detect the type of gesture tap one can implement something inline with this    here projectText is an EditText       projectText setOnTouchListener new View OnTouchListener             private GestureDetector gestureDetector   new GestureDetector activity  new GestureDetector SimpleOnGestureListener                  Override             public boolean onDoubleTap MotionEvent e                    projectText setInputType InputType TYPE CLASS TEXT                   activity getWindow   setSoftInputMode WindowManager LayoutParams SOFT INPUT STATE VISIBLE                   return super onDoubleTap e                              Override             public boolean onSingleTapUp MotionEvent e                        projectText setInputType InputType TYPE NULL      disable soft input                     final int itemPosition   getLayoutPosition                        if  projects get itemPosition  getProjectId   equals  quot -1 quot                            listener selectedClick projects get itemPosition                     return super onSingleTapUp e                                        Override         public boolean onTouch View v  MotionEvent event                gestureDetector onTouchEvent event               return false    true stops propagation of the event

User · Answer

if you do not wish to go for custom view then you can use following approach   e g  ImageView     class level  GestureDetector gestureDetector  boolean tapped  ImageView imageView      inside onCreate of Activity or Fragment gestureDetector   new GestureDetector context new GestureListener         --------------------------------------------------------------------------------  public class GestureListener extends         GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e             return true                event when double tap occurs      Override     public boolean onDoubleTap MotionEvent e             tapped    tapped           if  tapped                 else                         return true              --------------------------------------------------------------------------------  for ImageView  imageView setOnTouchListener new OnTouchListener               Override         public boolean onTouch View v  MotionEvent event                   TODO Auto-generated method stub             return gestureDetector onTouchEvent event

User · Answer

Equivalent C  code which i used to implement same functionality and can even customize to accept N number of Taps  public interface IOnTouchInterface       void ViewTapped       public class MultipleTouchGestureListener   Java Lang Object  View IOnTouchListener       int clickCount   0      long startTime      static long MAX DURATION   500      public int NumberOfTaps   get  set      7       readonly IOnTouchInterface interfc       public MultipleTouchGestureListener IOnTouchInterface tch                this interfc   tch             public bool OnTouch View v  MotionEvent e                switch  e Action                        case MotionEventActions Down                  clickCount                    if clickCount    1                      startTime   Utility CurrentTimeSince1970                  break              case MotionEventActions Up                  var currentTime   Utility CurrentTimeSince1970                  long time   currentTime - startTime                  if time  lt   MAX DURATION   NumberOfTaps                                        if  clickCount    NumberOfTaps                                                this interfc ViewTapped                            clickCount   0                                                          else                                       clickCount   0                                    break                    return true           public static class Utility       public static long CurrentTimeSince1970               get                       DateTime dt   new DateTime 1970  1  1  0  0  0  DateTimeKind Local               DateTime dtNow   DateTime Now              TimeSpan result   dtNow Subtract dt               long seconds    long result TotalMilliseconds              return seconds                      Currently Above code accepts 7 as number of taps before it raises the View Tapped event  But it can be customized with any number

User · Answer

combining  Bughi   DoubleClickListner  and  Jayant Arora  Timer in one contained class   public abstract class DoubleClickListener implements OnClickListener        private Timer timer   null     at class level      private int DELAY     400       private static final long DOUBLE CLICK TIME DELTA   300   milliseconds      long lastClickTime   0        Override     public void onClick View v            long clickTime   System currentTimeMillis            if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA               processDoubleClickEvent v             else               processSingleClickEvent v                     lastClickTime   clickTime               public void processSingleClickEvent final View v            final Handler handler new Handler            final Runnable mRunnable new Runnable                public void run                    onSingleClick v     Do what ever u want on single click                                    TimerTask timertask new TimerTask                 Override             public void run                    handler post mRunnable                                    timer new Timer            timer schedule timertask DELAY               public void processDoubleClickEvent View v           if timer  null                        timer cancel      Cancels Running Tasks or Waiting Tasks              timer purge       Frees Memory by erasing cancelled Tasks                    onDoubleClick v    Do what ever u want on Double Click            public abstract void onSingleClick View v        public abstract void onDoubleClick View v       and can be called as    view setOnClickListener new DoubleClickListener                   Override             public void onSingleClick View v                                 Override             public void onDoubleClick View v

User · Answer

Solution by bughi  amp  Jayant Arora for copypast   public abstract class DoubleClickListener implements View OnClickListener   private int position  private Timer timer   private static final long DOUBLE CLICK TIME DELTA   300   milliseconds  long lastClickTime   0   public DoubleClickListener  int position        this position   position      Override public void onClick View v        long clickTime   System currentTimeMillis        if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA           if  timer    null                timer cancel      Cancels Running Tasks or Waiting Tasks              timer purge       Frees Memory by erasing cancelled Tasks                    onDoubleClick v  position         else           final Handler handler   new Handler            final Runnable mRunnable      - gt                onSingleClick v  position                      TimerTask timertask   new TimerTask                  Override             public void run                     handler post mRunnable                                    timer   new Timer            timer schedule timertask  DOUBLE CLICK TIME DELTA              lastClickTime   clickTime     public abstract void onSingleClick View v  int position   public abstract void onDoubleClick View v  int position

User · Answer

In Kotlin you can try this  like i am using cardview for clicking   Example   on double click i perform like and dislike   cardviewPostCard setOnClickListener object   DoubleClickListener         override fun onDoubleClick v  View              if  holder toggleButtonLike isChecked                holder toggleButtonLike setChecked false               else               holder toggleButtonLike setChecked true                       and here is your DoubleClickListener class  abstract class DoubleClickListener   View OnClickListener       var lastClickTime  Long   0     override fun onClick v  View             val clickTime   System currentTimeMillis           if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA                onDoubleClick v                    lastClickTime   clickTime            abstract fun onDoubleClick v  View        companion object           private const val DOUBLE CLICK TIME DELTA  Long   300   milliseconds

User · Answer

Realization single and double click  public abstract class DoubleClickListener implements View OnClickListener    private static final long DOUBLE CLICK TIME DELTA   200   private long lastClickTime   0   private View view   private Handler handler   new Handler    private Runnable runnable   new Runnable          Override     public void run             onSingleClick view             private void runTimer        handler removeCallbacks runnable       handler postDelayed runnable DOUBLE CLICK TIME DELTA       Override public void onClick View view        this view   view      long clickTime   System currentTimeMillis        if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA           handler removeCallbacks runnable           lastClickTime   0          onDoubleClick view         else           runTimer            lastClickTime   clickTime           public abstract void onSingleClick View v   public abstract void onDoubleClick View v

User · Answer

GuestureDetecter Works Well on Most Devices  I would like to know how the time between two clicks can be customized on double click event  i wasn t able to do that  I updated the above code by  Bughi   DoubleClickListner   added a timer using handler that executes a code after a specific delay on single click  and if double click is performed before that delay it cancels the timer and single click task and only execute double click task  Code is working Fine Makes it perfect to use as double click listner     private Timer timer   null     at class level    private int DELAY     500     view setOnClickListener new DoubleClickListener               Override         public void onSingleClick View v         final Handler  handler            new Handler                    final Runnable mRunnable          new Runnable                         public void run                             processSingleClickEvent v     Do what ever u want on single click                                                            TimerTask timertask   new TimerTask                          Override                     public void run                             handler post mRunnable                                                            timer       new Timer                    timer schedule timertask  DELAY                               Override         public void onDoubleClick View v                    if timer  null                                     timer cancel      Cancels Running Tasks or Waiting Tasks                   timer purge       Frees Memory by erasing cancelled Tasks                                  processDoubleClickEvent v    Do what ever u want on Double Click

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public class MyView extends View    GestureDetector gestureDetector   public MyView Context context  AttributeSet attrs        super context  attrs                  creating new gesture detector     gestureDetector   new GestureDetector context  new GestureListener           skipping measure calculation and drawing         delegate the event to the gesture detector  Override public boolean onTouchEvent MotionEvent e        return gestureDetector onTouchEvent e       private class GestureListener extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true               event when double tap occurs      Override     public boolean onDoubleTap MotionEvent e            float x   e getX            float y   e getY             Log d  Double Tap    Tapped at       x         y                  return true

User · Answer

Improvised dhruvi code  public abstract class DoubleClickListener implements View OnClickListener    private static final long DOUBLE CLICK TIME DELTA   300   milliseconds  long lastClickTime   0  boolean tap   true    Override public void onClick View v        long clickTime   System currentTimeMillis        if  clickTime - lastClickTime  lt  DOUBLE CLICK TIME DELTA           onDoubleClick v           tap   false        else         tap   true       v postDelayed new Runnable              Override         public void run                 if tap                  onSingleClick                    DOUBLE CLICK TIME DELTA        lastClickTime   clickTime     public abstract void onDoubleClick View v    public abstract void onSingleClick

User · Answer

A simple way to do this in Kotlin button setOnTouchListener object   View OnTouchListener              val gestureDetector   GestureDetector object   GestureDetector SimpleOnGestureListener                    override fun onDoubleTap e  MotionEvent    Boolean                        do something here                     return super onDoubleTap e                                                override fun onTouch v  View   event  MotionEvent    Boolean                     do something here                 gestureDetector onTouchEvent event                  return true

User · Answer

I created a simple library to handle this  it can also detect more than two clicks  it all depends on you   after you import the ClickCounter class  here is how you use it to detect single and multiple clicks  ClickCounter counter   new ClickCounter      view setOnClickListener new View OnClickListener          Override     public void onClick View view            counter addClick        submits click to be counted            counter setClickCountListener new ClickCounter ClickCountListener          Override     public void onClickingCompleted int clickCount            rewardUserWithClicks clickCount      Thats All

User · Answer

While I liked the simplicity of the approach in the original answer Here is my version public abstract class OnDoubleClickListener implements View OnClickListener        private static final int TIME OUT   ViewConfiguration getDoubleTapTimeout        private TapHandler tapHandler   new TapHandler         public abstract void onSingleClick View v       public abstract void onDoubleClick View v         Override     public void onClick View v            tapHandler cancelSingleTap v           if  tapHandler isDoubleTap                 onDoubleClick v             else               tapHandler performSingleTap v                        private class TapHandler implements Runnable           public boolean isDoubleTap                 final long tapTime   System currentTimeMillis                boolean doubleTap   tapTime - lastTapTime  lt  TIME OUT              lastTapTime   tapTime              return doubleTap                    public void performSingleTap View v                view   v              v postDelayed this  TIME OUT                     public void cancelSingleTap View v                view   null              v removeCallbacks this                       Override         public void run                 if  view    null                    onSingleClick view                                   private View view          private long lastTapTime   0           Usage is same as the original view setOnClickListener new OnDoubleClickListener           Override     public void onSingleClick View v                 Override     public void onDoubleClick View v

User · Answer

Double-tap and Single-tap  Double-tap only  It is quite easy to detect a double tap on a view by using SimpleOnGestureListener  as demonstrated in Hannes Niederhausen s answer     private class GestureListener extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true              Override     public boolean onDoubleTap MotionEvent e            return true            I can t see a big advantage to re-inventing the logic for this  like bughi s answer    Double-tap and Single-tap with delay  You can also use the SimpleOnGestureListener to differentiate a single-tap and a double-tap as mutually exclusive events  To do that you just override onSingleTapConfirmed  This will delay running the single-tap code until the system is certain that the user hasn t double-tapped  ie  the delay   ViewConfiguration getDoubleTapTimeout     There is definately no reason to re-invent all the logic for that  as is done in this  this and other answers    private class GestureListener extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true              Override     public boolean onSingleTapConfirmed MotionEvent e            return true              Override     public boolean onDoubleTap MotionEvent e            return true            Double-tap and Single-tap with no delay  The potential problem with onSingleTapConfirmed is the delay  Sometimes a noticeable delay is not acceptable  In that case you can replace onSingleTapConfirmed with onSingleTapUp   private class GestureListener extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true              Override     public boolean onSingleTapUp MotionEvent e            return true              Override     public boolean onDoubleTap MotionEvent e            return true            You need to realize  though  that both onSingleTapUp and onDoubleTap will be called if there is a double-tap   This is essentially what bughi s answer does and what some of the commenters were complaining about   You either need to use the delay or call both methods  It s not possible have a single-tap with no delay and at the same time know whether the user is going to tap again    If the single-tap delay is not acceptable for you then you have a couple options    Accept that both onSingleTapUp and onDoubleTap will be called for a double-tap  Just divide up your logic appropriately so that it doesn t matter  This is essentially what I did when I implemented a double-tap for caps-lock on a custom keyboard  Don t use a double-tap  It s not an intuitive UI action for most things  As Dave Webb suggests  a long press is probably better  You can also implement that with the SimpleOnGestureListener   private class GestureListener extends GestureDetector SimpleOnGestureListener         Override     public boolean onDown MotionEvent e            return true              Override     public boolean onSingleTapUp MotionEvent e            return true              Override     public void onLongPress MotionEvent e

User · Answer

boolean nonDoubleClick   true  singleClick   false          private long firstClickTime   0L          private final int DOUBLE CLICK TIMEOUT   200           listview setOnItemClickListener new OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View v  int pos  long id                       TODO Auto-generated method stub                 Handler handler   new Handler                    handler postDelayed new Runnable                           Override                     public void run                                TODO Auto-generated method stub                         if  singleClick                                Toast makeText getApplicationContext     Single Tap Detected   Toast LENGTH SHORT  show                                                      firstClickTime   0L                          nonDoubleClick   true                          singleClick   false                                           200                   if  firstClickTime    0                        firstClickTime   SystemClock elapsedRealtime                        nonDoubleClick   true                      singleClick   true                    else                       long deltaTime   SystemClock elapsedRealtime   - firstClickTime                      firstClickTime   0                      if  deltaTime  lt  DOUBLE CLICK TIMEOUT                            nonDoubleClick   false                          singleClick   false                          Toast makeText getApplicationContext     Double Tap Detected   Toast LENGTH SHORT  show

[android] Android: How to detect double-tap?

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