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<SearchItem> sResultsArr = new ArrayList<SearchItem>();
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<?> 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() > 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 < 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<SearchItem> 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 < 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?
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.
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 < 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) {
}
});
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.
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 < 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) {
}
});
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);
}
});
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) {
}
}
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
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
}
});
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<?> 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 < DOUBLE_CLICK_TIMEOUT) {
nonDoubleClick = false;
singleClick = false;
Toast.makeText(getApplicationContext(), "Double Tap Detected", Toast.LENGTH_SHORT).show();
}
}
}
});
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 < 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();
}
My solution, may be helpful.
long lastTouchUpTime = 0;
boolean isDoubleClick = false;
private void performDoubleClick() {
long currentTime = System.currentTimeMillis();
if(!isDoubleClick && currentTime - lastTouchUpTime < DOUBLE_CLICK_TIME_INTERVAL) {
isDoubleClick = true;
lastTouchUpTime = currentTime;
Toast.makeText(context, "double click", Toast.LENGTH_SHORT).show();
}
else {
lastTouchUpTime = currentTime;
isDoubleClick = false;
}
}
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 ->
return#setOnTouchListener gestureDetector.onTouchEvent(event)
}
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++;
}
}
});
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 < 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);
}
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 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;
}
}
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
Solution by bughi & 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 < 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 = () -> {
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);}
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 <= 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
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
}
}
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!!😃
}
});
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 < 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
}
}
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 < 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) {
}
});
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
}
})
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("-1"))
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
}
});
This is the Kotlin extension function version:
fun View.setOnDoubleTapListener(action: () -> Unit) {
// instantiate GestureDetectorCompat
val gDetector = GestureDetectorCompat(
this.context,
GestureDetector.SimpleOnGestureListener()
)
// Create anonymous class extend OnTouchListener and SimpleOnGestureListener
val touchListener =
object : View.OnTouchListener, GestureDetector.SimpleOnGestureListener() {
override fun onTouch(view: View?, event: MotionEvent?): Boolean {
gDetector.onTouchEvent(event)
gDetector.setOnDoubleTapListener(this)
return true
}
override fun onDoubleTap(e: MotionEvent?): Boolean {
action()
return true
}
}
this.setOnTouchListener(touchListener)
}
Kotlin w/o extra class
override fun onCreate(savedInstanceState: Bundle?) {
// ...
var listview: ListView = findViewById(R.id.<your_listview_id>)
var itemLastClickTime: Long = 0
var singleClickHandler: Handler = Handler(Looper.getMainLooper())
// ListView item 'double click' and 'single click'
listview.setOnItemClickListener(OnItemClickListener { av, iv, pos, id ->
// if double click occurs, disable single click handler
if (System.currentTimeMillis() - itemLastClickTime < 300) {
singleClickHandler.removeCallbacksAndMessages(null)
// do double click handling
return#OnItemClickListener
}
// store the time of the item's click event
itemLastClickTime = System.currentTimeMillis()
// single click handler only fires, if no double click occured
singleClickHandler.postDelayed({
// do single click handling
}, 300)
})
// ...
}
Java w/o extra class
#Override
protected void onCreate(Bundle savedInstanceState) {
// ...
ListView listview = findViewById(R.id.<your_listview_id>);
final long[] itemLastClickTime = {0};
Handler singleClickHandler = new Handler();
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> av, View iv, int pos, long id) {
// if double click occurs, disable single click handler
if (System.currentTimeMillis() - itemLastClickTime[0] < 300) {
singleClickHandler.removeCallbacksAndMessages(null);
// do double click handling
return;
}
// store the time of the item's click event
itemLastClickTime[0] = System.currentTimeMillis();
// single click handler only fires, if no double click occured
singleClickHandler.postDelayed(new Runnable() {
#Override
public void run() {
// do single click handling
}
}, 300);
}
});
// ...
}