I have a ViewPager which has 3 fragments. Fragment A on the left, B in the middle and C on the right. Fragment C has a ListView which fills the whole width of the screen. I implemented a swipe listener on my ListView items using the following code:
SWIPE DETECTOR :
public class SwipeDetector implements View.OnTouchListener {
public static enum Action {
LR, // Left to Right
RL, // Right to Left
TB, // Top to bottom
BT, // Bottom to Top
None // when no action was detected
}
private static final String logTag = "SwipeDetector";
private static final int MIN_DISTANCE = 100;
private static final int VERTICAL_MIN_DISTANCE = 80;
private static final int HORIZONTAL_MIN_DISTANCE = 80;
private float downX, downY, upX, upY;
private Action mSwipeDetected = Action.None;
public boolean swipeDetected() {
return mSwipeDetected != Action.None;
}
public Action getAction() {
return mSwipeDetected;
}
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
downY = event.getY();
mSwipeDetected = Action.None;
return false; // allow other events like Click to be processed
}
case MotionEvent.ACTION_MOVE: {
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// horizontal swipe detection
if (Math.abs(deltaX) > HORIZONTAL_MIN_DISTANCE) {
// left or right
if (deltaX < 0) {
// Log.i(logTag, "Swipe Left to Right");
mSwipeDetected = Action.LR;
return true;
}
if (deltaX > 0) {
// Log.i(logTag, "Swipe Right to Left");
mSwipeDetected = Action.RL;
return true;
}
} else
// vertical swipe detection
if (Math.abs(deltaY) > VERTICAL_MIN_DISTANCE) {
// top or down
if (deltaY < 0) {
Log.i(logTag, "Swipe Top to Bottom");
mSwipeDetected = Action.TB;
return false;
}
if (deltaY > 0) {
Log.i(logTag, "Swipe Bottom to Top");
mSwipeDetected = Action.BT;
return false;
}
}
return true;
}
}
return false;
}}
I use it in the following way :
listView.setOnTouchListener(swipeDetector);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
final int position, long id) {
Log.d("CLICKED", "CLICKED");
if (swipeDetector.swipeDetected()) {
Log.d("SWIPING", "SWIPING");
Log.d("ACTION", swipeDetector.getAction().toString());
final Button del = (Button) view.findViewById(R.id.delete_button);
if (swipeDetector.getAction() == SwipeDetector.Action.LR) {
Log.d("LEFT TO RIGHT", "Left to right");
This works perfectly fine with Activities. However, the problem now is that when I swipe, it assumes I am swiping in the ViewPager and takes me back to the middle fragment. Is there a way to disable the ViewPager swiping on this ListView or change the focus so that this works?
Just like how those conveyors in some apps that you can swipe to the right to bring out (show it) and then swipe to the left to send back in, hiding it again. I tried using setOnTouchListener again on the same view with a delayed message after it's brought out, but the app receives an error and closes when you try to bring it out (show). If I am to remove the method that is supposed to make it go back in (hidden), it would be brought out just fine, but how do I make it happen that it could be sent back in and hidden through swiping to the left after it's been brought out by swiping to the right?
Here's the code I used in the activity:
ImageView conveyorWheel;
private float x1, x2;
static final int MIN_DISTANCE = 150;
RelativeLayout parentLayout;
android.os.Handler conveyorHandler;
conveyorWheel = (ImageView) findViewById(R.id.conveyerWheel);
parentLayout = (RelativeLayout) findViewById(R.id.parentLayout);
protected void onCreate(Bundle savedInstanceState) {
...
parentLayout.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
x1 = event.getX();
break;
case MotionEvent.ACTION_MOVE:
x2 = event.getX();
float deltaX = x2 - x1;
if (Math.abs(deltaX) > MIN_DISTANCE & x1 < x2) {
conveyorWheel.animate()
.x(-750)
.setDuration(150)
.start();
conveyorHandler.postDelayed(new Runnable() {
#Override
public void run() {
conveyorRevert();
}
}, 151);
break;
}
default:
return false;
}
return true;
}
});
}
private void conveyorRevert (){
parentLayout.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
x1 = event.getX();
break;
case MotionEvent.ACTION_MOVE:
x2 = event.getX();
float deltaX = x2 - x1;
if (Math.abs(deltaX) > MIN_DISTANCE){
conveyorWheel.animate()
.x(-950)
.setDuration(150)
.start();
break;
}
default: return false;
}
return true;
}
});
}
The Android Monitor displayed the error:
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.postDelayed(java.lang.Runnable, long)' on a null object reference
But I have no idea how to fix this
I have an activity which is acting like a bottom sheet. I have it set so the user can drag it with their finger and it will move accordingly. All works well except when the bottomsheet is dragged whichever icon is closest to the bottom gets resized instead of just dropping off the screen. This creates a weird and unwanted effect.
Here is a picture of what is happening:
Here is the method for resizing:
public void setAdjustableTouchListener() {
full.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mDragStartY = event.getY();
mDraggingStarted = SystemClock.elapsedRealtime();
mPointerOffset = event.getRawY() + main.getMeasuredHeight();
return true;
case MotionEvent.ACTION_UP:
if (mDragStartY < (event.getY() + TAP_DRIFT_TOLERANCE) && mDragStartY > (event.getY() - TAP_DRIFT_TOLERANCE)
&& ((SystemClock.elapsedRealtime() - mDraggingStarted) < SINGLE_TAP_MAX_TIME)) {
result = "Dismissed";
finish();
} else {
if (main.getMeasuredHeight() > (viewConversion + heightDifference)) {
ResizeAnimation a = new ResizeAnimation(main);
a.setDuration(500);
a.setParams(main.getMeasuredHeight(), extendedViewHeight);
main.startAnimation(a);
} else if (main.getMeasuredHeight() < (viewConversion + heightDifference)
&& main.getMeasuredHeight() > viewConversion) {
ResizeAnimation a = new ResizeAnimation(main);
a.setDuration(500);
a.setParams(main.getMeasuredHeight(), viewConversion);
main.startAnimation(a);
} else if (main.getMeasuredHeight() < viewConversion && main.getMeasuredHeight() > (viewConversion / 2)) {
ResizeAnimation a = new ResizeAnimation(main);
a.setDuration(500);
a.setParams(main.getMeasuredHeight(), viewConversion);
main.startAnimation(a);
} else {
result = "Dismissed";
finish();
}
}
return true;
case MotionEvent.ACTION_MOVE:
if (mPointerOffset - event.getRawY() < extendedViewHeight)
setPrimaryContentHeight((int) (mPointerOffset - event.getRawY()));
return true;
default:
return true;
}
}
});
}
try this
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
The user will touch a image and it is important that if he left his finger up in that image or not
i tried with writing a onTouchListner() and after that using swich case but i don't know how to continue
image.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
break;
}
return true;
}
});
thank's in advance
I found my answer through this link but i change it to this:
private Rect rect; // Variable rect to hold the bounds of the view
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
if (!rect.contains(v.getLeft() + (int) event.getX(), v.getTop() + (int) event.getY())) {
// User moved outside bounds
}
break;
case MotionEvent.ACTION_DOWN:
rect = new Rect(v.getLeft(), v.getTop(), v.getRight(), v.getBottom());
break;
}
return false;
}
Don't forgot MotionEvent.ACTION_CANCEL
I am currently using onTouchEvent(MotionEvent event) { } to detect when the user presses my glSurfaceView is there a way to detect when a long click is made.
I'm guessing if I can't find much in the dev docs then it will be some sort of work around method. Something like registering ACTION_DOWN and seeing how long it is before ACTION_UP.
How do you detect long presses on Android using opengl-es?
GestureDetector is the best solution.
Here is an interesting alternative. In onTouchEvent on every ACTION_DOWN schedule a Runnable to run in 1 second. On every ACTION_UP or ACTION_MOVE, cancel scheduled Runnable. If cancelation happens less than 1s from ACTION_DOWN event, Runnable won't run.
final Handler handler = new Handler();
Runnable mLongPressed = new Runnable() {
public void run() {
Log.i("", "Long press!");
}
};
#Override
public boolean onTouchEvent(MotionEvent event, MapView mapView){
if(event.getAction() == MotionEvent.ACTION_DOWN)
handler.postDelayed(mLongPressed, ViewConfiguration.getLongPressTimeout());
if((event.getAction() == MotionEvent.ACTION_MOVE)||(event.getAction() == MotionEvent.ACTION_UP))
handler.removeCallbacks(mLongPressed);
return super.onTouchEvent(event, mapView);
}
Try this:
final GestureDetector gestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
public void onLongPress(MotionEvent e) {
Log.e("", "Longpress detected");
}
});
public boolean onTouchEvent(MotionEvent event) {
return gestureDetector.onTouchEvent(event);
};
I have a code which detects a click, a long click and movement.
It is fairly a combination of the answer given above and the changes i made from peeping into every documentation page.
//Declare this flag globally
boolean goneFlag = false;
//Put this into the class
final Handler handler = new Handler();
Runnable mLongPressed = new Runnable() {
public void run() {
goneFlag = true;
//Code for long click
}
};
//onTouch code
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
handler.postDelayed(mLongPressed, 1000);
//This is where my code for movement is initialized to get original location.
break;
case MotionEvent.ACTION_UP:
handler.removeCallbacks(mLongPressed);
if(Math.abs(event.getRawX() - initialTouchX) <= 2 && !goneFlag) {
//Code for single click
return false;
}
break;
case MotionEvent.ACTION_MOVE:
handler.removeCallbacks(mLongPressed);
//Code for movement here. This may include using a window manager to update the view
break;
}
return true;
}
I confirm it's working as I have used it in my own application.
I have created a snippet - inspired by the actual View source - that reliably detects long clicks/presses with a custom delay. But it's in Kotlin:
val LONG_PRESS_DELAY = 500
val handler = Handler()
var boundaries: Rect? = null
var onTap = Runnable {
handler.postDelayed(onLongPress, LONG_PRESS_DELAY - ViewConfiguration.getTapTimeout().toLong())
}
var onLongPress = Runnable {
// Long Press
}
override fun onTouch(view: View, event: MotionEvent): Boolean {
when (event.action) {
MotionEvent.ACTION_DOWN -> {
boundaries = Rect(view.left, view.top, view.right, view.bottom)
handler.postDelayed(onTap, ViewConfiguration.getTapTimeout().toLong())
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
handler.removeCallbacks(onLongPress)
handler.removeCallbacks(onTap)
}
MotionEvent.ACTION_MOVE -> {
if (!boundaries!!.contains(view.left + event.x.toInt(), view.top + event.y.toInt())) {
handler.removeCallbacks(onLongPress)
handler.removeCallbacks(onTap)
}
}
}
return true
}
When you mean user presses, do you mean a click? A click is when the user presses down and then immediately lifts up finger. Therefore it is encompassing two onTouch Events. You should save the use of onTouchEvent for stuff that happens on the initial touch or the after release.
Thus, you should be using onClickListener if it is a click.
Your answer is analogous: Use onLongClickListener.
The solution by MSquare works only if you hold a specific pixel, but that's an unreasonable expectation for an end user unless they use a mouse (which they don't, they use fingers).
So I added a bit of a threshold for the distance between the DOWN and the UP action in case there was a MOVE action inbetween.
final Handler longPressHandler = new Handler();
Runnable longPressedRunnable = new Runnable() {
public void run() {
Log.e(TAG, "Long press detected in long press Handler!");
isLongPressHandlerActivated = true;
}
};
private boolean isLongPressHandlerActivated = false;
private boolean isActionMoveEventStored = false;
private float lastActionMoveEventBeforeUpX;
private float lastActionMoveEventBeforeUpY;
#Override
public boolean dispatchTouchEvent(MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
longPressHandler.postDelayed(longPressedRunnable, 1000);
}
if(event.getAction() == MotionEvent.ACTION_MOVE || event.getAction() == MotionEvent.ACTION_HOVER_MOVE) {
if(!isActionMoveEventStored) {
isActionMoveEventStored = true;
lastActionMoveEventBeforeUpX = event.getX();
lastActionMoveEventBeforeUpY = event.getY();
} else {
float currentX = event.getX();
float currentY = event.getY();
float firstX = lastActionMoveEventBeforeUpX;
float firstY = lastActionMoveEventBeforeUpY;
double distance = Math.sqrt(
(currentY - firstY) * (currentY - firstY) + ((currentX - firstX) * (currentX - firstX)));
if(distance > 20) {
longPressHandler.removeCallbacks(longPressedRunnable);
}
}
}
if(event.getAction() == MotionEvent.ACTION_UP) {
isActionMoveEventStored = false;
longPressHandler.removeCallbacks(longPressedRunnable);
if(isLongPressHandlerActivated) {
Log.d(TAG, "Long Press detected; halting propagation of motion event");
isLongPressHandlerActivated = false;
return false;
}
}
return super.dispatchTouchEvent(event);
}
The idea is creating a Runnable for execute long click in a future, but this execution can be canceled because of a click, or move.
You also need to know, when long click was consumed, and when it is canceled because finger moved too much. We use initialTouchX & initialTouchY for checking if the user exit a square area of 10 pixels, 5 each side.
Here is my complete code for delegating Click & LongClick from Cell in ListView to Activity with OnTouchListener:
ClickDelegate delegate;
boolean goneFlag = false;
float initialTouchX;
float initialTouchY;
final Handler handler = new Handler();
Runnable mLongPressed = new Runnable() {
public void run() {
Log.i("TOUCH_EVENT", "Long press!");
if (delegate != null) {
goneFlag = delegate.onItemLongClick(index);
} else {
goneFlag = true;
}
}
};
#OnTouch({R.id.layout})
public boolean onTouch (View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
handler.postDelayed(mLongPressed, ViewConfiguration.getLongPressTimeout());
initialTouchX = motionEvent.getRawX();
initialTouchY = motionEvent.getRawY();
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_CANCEL:
if (Math.abs(motionEvent.getRawX() - initialTouchX) > 5 || Math.abs(motionEvent.getRawY() - initialTouchY) > 5) {
handler.removeCallbacks(mLongPressed);
return true;
}
return false;
case MotionEvent.ACTION_UP:
handler.removeCallbacks(mLongPressed);
if (goneFlag || Math.abs(motionEvent.getRawX() - initialTouchX) > 5 || Math.abs(motionEvent.getRawY() - initialTouchY) > 5) {
goneFlag = false;
return true;
}
break;
}
Log.i("TOUCH_EVENT", "Short press!");
if (delegate != null) {
if (delegate.onItemClick(index)) {
return false;
}
}
return false;
}
ClickDelegateis an interface for sending click events to the handler class like an Activity
public interface ClickDelegate {
boolean onItemClick(int position);
boolean onItemLongClick(int position);
}
And all what you need is to implement it in your Activity or parent Viewif you need to delegate the behavior:
public class MyActivity extends Activity implements ClickDelegate {
//code...
//in some place of you code like onCreate,
//you need to set the delegate like this:
SomeArrayAdapter.delegate = this;
//or:
SomeViewHolder.delegate = this;
//or:
SomeCustomView.delegate = this;
#Override
public boolean onItemClick(int position) {
Object obj = list.get(position);
if (obj) {
return true; //if you handle click
} else {
return false; //if not, it could be another event
}
}
#Override
public boolean onItemLongClick(int position) {
Object obj = list.get(position);
if (obj) {
return true; //if you handle long click
} else {
return false; //if not, it's a click
}
}
}
setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
int action = MotionEventCompat.getActionMasked(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
longClick = false;
x1 = event.getX();
break;
case MotionEvent.ACTION_MOVE:
if (event.getEventTime() - event.getDownTime() > 500 && Math.abs(event.getX() - x1) < MIN_DISTANCE) {
longClick = true;
}
break;
case MotionEvent.ACTION_UP:
if (longClick) {
Toast.makeText(activity, "Long preess", Toast.LENGTH_SHORT).show();
}
}
return true;
}
});
Here is an approach, based on MSquare's nice idea for detecting a long press of a button, that has an additional feature: not only is an operation performed in response to a long press, but the operation is repeated until a MotionEvent.ACTION_UP message is received. In this case, the long-press and short-press actions are the same, but they could be different.
Note that, as others have reported, removing the callback in response to a MotionEvent.ACTION_MOVE message prevented the callback from ever getting executed since I could not keep my finger still enough. I got around that problem by ignoring that message.
private void setIncrementButton() {
final Button btn = (Button) findViewById(R.id.btn);
final Runnable repeater = new Runnable() {
#Override
public void run() {
increment();
final int milliseconds = 100;
btn.postDelayed(this, milliseconds);
}
};
btn.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent e) {
if (e.getAction() == MotionEvent.ACTION_DOWN) {
increment();
v.postDelayed(repeater, ViewConfiguration.getLongPressTimeout());
} else if (e.getAction() == MotionEvent.ACTION_UP) {
v.removeCallbacks(repeater);
}
return true;
}
});
}
private void increment() {
Log.v("Long Press Example", "TODO: implement increment operation");
}
option: custom detector class
abstract public class
Long_hold
extends View.OnTouchListener
{
public#Override boolean
onTouch(View view, MotionEvent touch)
{
switch(touch.getAction())
{
case ACTION_DOWN: down(touch); return true;
case ACTION_MOVE: move(touch);
}
return true;
}
private long
time_0;
private float
x_0, y_0;
private void
down(MotionEvent touch)
{
time_0= touch.getEventTime();
x_0= touch.getX();
y_0= touch.getY();
}
private void
move(MotionEvent touch)
{
if(held_too_short(touch) {return;}
if(moved_too_much(touch)) {return;}
long_press(touch);
}
abstract protected void
long_hold(MotionEvent touch);
}
use
private double
moved_too_much(MotionEvent touch)
{
return Math.hypot(
x_0 -touch.getX(),
y_0 -touch.getY()) >TOLERANCE;
}
private double
held_too_short(MotionEvent touch)
{
return touch.getEventTime()-time_0 <DOWN_PERIOD;
}
where
TOLERANCE is the maximum tolerated movement
DOWN_PERIOD is the time one has to press
import
static android.view.MotionEvent.ACTION_MOVE;
static android.view.MotionEvent.ACTION_DOWN;
in code
setOnTouchListener(new Long_hold()
{
protected#Override boolean
long_hold(MotionEvent touch)
{
/*your code on long hold*/
}
});
I found one solution and it does not require to define runnable or other things and it's working fine.
var lastTouchTime: Long = 0
// ( ViewConfiguration.#.DEFAULT_LONG_PRESS_TIMEOUT =500)
val longPressTime = 500
var lastTouchX = 0f
var lastTouchY = 0f
view.setOnTouchListener { v, event ->
when (event.action) {
MotionEvent.ACTION_DOWN -> {
lastTouchTime = SystemClock.elapsedRealtime()
lastTouchX = event.x
lastTouchY = event.y
return#setOnTouchListener true
}
MotionEvent.ACTION_UP -> {
if (SystemClock.elapsedRealtime() - lastTouchTime > longPressTime
&& Math.abs(event.x - lastTouchX) < 3
&& Math.abs(event.y - lastTouchY) < 3) {
Log.d(TAG, "Long press")
}
return#setOnTouchListener true
}
else -> {
return#setOnTouchListener false
}
}
}