I'm developing an Android app with GoogleMap and I need to implement a SlidingPanelLayout in this Activity.
I want to open the SlidingPanelLayout only when a certain button is clicked, because if I drag the finger
on the GoogleMap the SlindingPanelLayout appears. So if I fix the open SlidingPanelLayout only when the button is clicked, the problem will be solved.
Are there any way to block the SlidingPanelLayout opening when I drag on the map, or something like this?
If you really want the panel to open only through a button press, you should create a class that extends SlidingPaneLayout and override the onInterceptTouchEvent() method.
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(!isOpen()){
//The map panel is being shown. We don't want the SlidingPaneLayout to handle the MotionEvent.
return false;
}
else{
//The other panel is being shown... Let the SlidingPaneLayout handle the MotionEvent as normal.
return super.onInterceptTouchEvent(ev);
}
}
Remember to use the custom SlidingPaneLayout class in your code or layout and not the regular one. Also, you should, obviously, place a button that will call the openPane() method of your custom class somewhere.
====
THE APPROACH BELOW IS NOT THE ANSWER TO THE QUESTION, BUT AN ALTERNATIVE SOLUTION
Now, if you want to let the user to freely use the GoogleMap object and let the SlidingPaneLayout open if a drag event occur in a certain region of the screen/map, you can use this approach:
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
//Get the user touch event position in dp units
float xTouchPosDp = ev.getX()/getResources().getDisplayMetrics().density;
if(!isOpen()){
if(xTouchPosDp < 30){
//If the panel is closed (map pane being entirely shown)
//and the touch event occur on the first 30 horizontal dp's
//Let the SlidingPaneLayout onTouchEvent() method handle the
//motion event alone (the GoogleMap object won't receive the event
//and depending on the movement, the panel will open)
return true;
}else{
//Now, if the panel is closed, but the touch event occur
//on the rest of the screen, let the GoogleMap object handle
//the motion event.
return false;
}
}
else{
//If the panel is opened, let the SlidingPaneLayout handle the
//motion event normally.
return super.onInterceptTouchEvent(ev);
}
}
Again, remember to use your custom SlidingPaneLayout class in your code/layout.
The problem with this solution is that if both panels are opened (they together fit the entire screen), you won't be able to move the map laterally.
Related
Situation
I want to implement a timeout in my app. If the user did not touch the screen within 2 minutes an inactivity fragment will be shown.
What i got so far
I am tracking the activity lifecycle using a custom Application implementing Application.ActivityLifecycleCallbacks. This way i know which Activity is currently on top and can access its FragmentManager to show my inactivity Fragment on timeout. A background Thread constantly checks if the last detected touch was longer ago than 2 minutes.
Problem
I dont know how to detect every touch that happens on the activity. I tried adding a OnTouchListener to activity.getWindow().getDecorView().setOnTouchListener(), but it is only called if the decorview is touched. If for instance a Button on top of it is touched my listener isn't notified. activity.getContentScene()' returns null for me, so i can't access the rootViewGroup` like that either.
Question
How can i detect any touches that happen on a Activity or the whole Application?
override dispatch touch event in your activity
#Override
public boolean dispatchTouchEvent(MotionEvent ev) {
Rect viewRect = new Rect();
view.getGlobalVisibleRect(viewRect);
//or
int x= ev.getRawX();
int y= ev.getRawY();
if(/*check bounds of your view*/){
// set your views visiblity to gone or what you want.
}
//for prevent consuming the event.
return super.dispatchTouchEvent(ev);
}
I am writing an very simple application with following scenario:
1) Screen A have 3 button to move on other screen's.
2) Now if I hold one button(say Button 1) and perform rapid click on other button then it launch multiple instance of other screen. Which I think should not be happened. How can prevent this.
3) and it's more weird. After move on other screen if I don't release Button 1 which was on Screen A then it still allow to perform click for rest of two button of screen A even I can see second screen.
Here it's clear launch second screen but still first screen button event working.
Any idea how can avoid such scenario.
How you are going to disable other buttons while having 1 enabled, that's an algorhytmic problem. You can try creating a boolean or control variable in your activity (and then pass the final reference of the activity to wherever you need it), or in a static context. But to answer the title of the question - you can "Cancel Touch Event" either by adding an OnTouchListener, or if you're extending class Button, you can override onTouchEvent(MotionEvent ev) method.
Using OnTouchListener will disable any previously defined touch-event behavior. You can call the actual click event from the inside by calling performClick method from your button.
//in order to use button inside OnTouchEvent, its reference must be final
//if it's not, create a new final reference to your button, like this:
final finalButton = button;
button.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouchEvent(MotionEvent ev) {
// ... additional code if necessary
if(canBeClicked) {
finalButton.performClick();
return true;
}
else return false;
}
}
Overriding onTouchEvent in a class extending Button should look something like this.
#Override
public boolean onTouchEvent(MotionEvent ev) {
// ... additional code if necessary
//here we don't really need to call performClick(), although API recommends it
//we just send the touch event to the super-class and let it handle the situation.
if(activity.canBeClicked) return super.onTouchEvent(ev);
else return false;
}
One solution that I found is to disable click listener in onPause() and enable it in onResume() . Can we have better support for this?
I have a ViewPager that can contain two types of views. One of the view types has buttons, one of the view types does not. The buttonless view type does have to trap touches in onTouchEvent in order to pan and zoom an image. But I want to let clicks bubble to the ViewPager (that has a clickListener attached to it)
I have to return true in the view's onTouchEvent ACTION_DOWN or else it won't see future events.
I can't use onInterceptTouchEvent() in the ViewPager to capture clicks because one of the views does have buttons and those buttons need their clicks
So how can my view trap swipes, and let clicks bubble up?
proper way is probably to intercept only the events you want to intercept, by returning true in onInterceptTouchEvent only when needed.
but if you want to go with the dark side, there's a dirty alternative, that probably will lure you and you'll probably regret later: intercept all the events, then if needed pass them down.
e.g. have inside your views something like
public boolean canInterceptTouch(MotionEvent ev) {
// return true if you are interested in this touch event, e.g. it falls into
// a clickable area
}
and something that handle the touch event like
public void interceptTouch(MotionEvent ev) {
// here you react to the event
}
inside your viewpager you have
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return true;
}
thien the view pager will handle the events in a dirty way like this:
#Override
public boolean onTouchEvent(MotionEvent ev) {
if (yourView.canInterceptTouch(ev))) {
yourView.interceptTouch(ev);
return true;
} else {
return doSomethingElse();
}
}
note: although I've done something similar, with decent result, I do NOT reccomend it as a solution unless you've very simple logic in the handling of the motion events, otherwise it becomes a mess. Your future self will be happier if you spend some time now to do it properly.
EDIT: code has not been tested, just to give you an idea of what you need. Sorry for any typo.
Try using this ViewGroup.onInterceptTouchEvent(MotionEvent).This allows a ViewGroup to watch events as they are dispatched to child Views`
I have an app that overrides the onTouchEvent(MotionEvent ev) of the MainActivity to determine Two-Finger-Swipe and Pich-Open/Pinch-Close.
Everything works fine until I add the DrawerLayout to the app (like it's described in Creating a Navigation Drawer). Problem: the DrawerLayout prevents the call of onTouchEvent() in the MainActivity.
I started to write a CustomDrawerLayout, and try to override the DrawerLayout methods onInterceptTouch() and onTouchEvent().
The only way (I found) to transmit the TouchEvent to the MainActivity:
// onTouchEvent of CustomDrawerLayout
#Override
public boolean onTouchEvent(MotionEvent ev){
// super.onTouchEvent(ev); // prevent transmission of TouchEvent
return false;
}
The problem here is that the Drawer doesn't open correctly. The Drawer stucks like described in this post:
DrawerLayout getting stuck on swipe.
Is it possible to transmit the TouchEvent to MainActivity to handle the MultiTouchDetection? Or do I have to handle this in CustomDrawerLayout?
UPDATE 1
First I have to say that the Drawer only stucks, if I swipe from the left edge. By clicking on the DrawerIcon in the ActionBar the Drawer works fine.
Transmission of TouchEvent works with following code. But only if the Drawer is opend! Otherwise Activity.onTouchEvent isn't called!
// onTouchEvent of CustomDrawerLayout
#Override
public boolean onTouchEvent(MotionEvent ev){
// super.onTouchEvent(ev); // still prevents transmission of TouchEvent
activity.onTouchEvent(ev);
return true;
}
By opening the Drawer with a swipe from the edge (-> Drawer stucks) i get a really strange behaviour :
just DrawerIcon can close "stucked Drawer" (-> I wouldn't expect something different because I override the CustomDrawerLayout.onTouchEvent)
if I close the stucked Drawer by DrawersIcon the CustomDrawerLayout.onTouchEvent is still called
Thats strange! Why Activity.onTouchEvent() isn't called? And how can I prevent the stucked Drawer?
UPDATE 2
Now i override the CustomDrawerLayout.onInterceptTouch():
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
return true;
}
This has the effect that the Drawer can't be opened by a swipe from the edge -> only the DrawersIcon can open and close the Drawer. But now the TouchEvent is always transmitted to the Activity (-> that works like expected).
But what I really want is to have the possibilty to open the Drawer by a swipe from the edge AND to have my MultiGestureDetector. Is this possible?
A bit of a late update, but after having this issue for a couple of days, the solution that worked best for me was creating a CustomDrawerLayout. Then, casting the Context from the constructor as an Activity, called the Activity onTouchEvent from onInterceptTouchEvent.
#Override public boolean onInterceptTouchEvent( MotionEvent ev )
{
getActivity().onTouchEvent( ev );
return super.onInterceptTouchEvent( ev );
}
I find the code to be a lame hack... but works for me. Good luck!
I was having some issues recognizing gestures for items within the navigation drawer itself and came across requestDisallowInterceptTouchEvent. What I found was that I was getting the MotionEvent.ACTION_DOWN, but nothing after that because the NavigationDrawer was intercepting the touches. The key would be to call requestDisallowInterceptTouchEvent(true) on the down event in your touch handler in the activity so that you can handle the touch without it being intercepted.
This presentation was also extremely useful when trying to figure out the touch system in Android.
In case you or anyone else still need it, here is my implementation.
Works perfectly with the exception of the "edge" not being taken from android code but as a constant (which I set).
Please view this link:
Android Navigation Drawer Doesn't Pass onTouchEvent to Activity
I want to get x and y position of every touch point in my activity even in drag mode. When I implement onTouchEvent method of my activity, it does not get all of touch events. How can I do that?
Thanks in advance,
public class MyActivity extends Activity {
#Override
public boolean onTouchEvent(MotionEvent event) {
// my Code
return super.onTouchEvent(event);
}
}
This onTouchEvent method just rises when you touch around the activity.
Do you have any other View which handle touch events?
The documentation says:
Called when a touch screen event was not handled by any of the views
under it. This is most useful to process touch events that happen
outside of your window bounds, where there is no view to receive it.
So when you say you don't get any events when you are in drag mode, this implies that you're dragging some thing. So you already handling the events somewhere else and therefore the onTouchEvent() method won't be notified.
You can try to return false in the other TouchListener's onTouch() method so the event will bubble up further more.