Develop Reference

Forward touch event to dynamically attached view, without lifting finger

I have a problem I am struggling with a while now.
I have a Layout with a Button and a container in it.
<FrameLayout ... >
<Button
android:id="#+id/button"
...
/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/overlayContainer"/>
</FrameLayout>
My goal is that as I long-press the button, I attach a custom view MyCustomViewto the container and keep the finger pressed.
All the following (ACTION_MOVE, ACTION_UP) events should then ideally be dispatched to and evaluated by MyCustomView.
MyCustomView works like a circular flyout menu: it overlays, dims the background, and shows some options. You then slide your pressed finger to the option, lift it up, and it triggers a result.
mButton.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// attach custom view to overlayContainer
// simplified code for demonstration
overlayContainer.addView(new MyCustomView());
return true;
}
});
Right now I don't see any option to "steal" the ACTION_DOWN-Event (which is required to start the event flow to a view) from the Button as I'm above it.
Nor does it work to manually generate and dispatch a ACTION_DOWN-Event in MyCustomView as I attach it.
While researching I found this post here, it basically is the same requirement, but for iOS (also does not provide an elegant solution, other that an click capturing overlay view) ): How to preserve touch event after new view is added by long press
Note that I want to avoid some kind of global overlay over the main view, I would like the solution to be as pluggable and portable as possible.
Thanks for any suggestions.

To answer my own question after the hint in the comments:
I solved it using a bare stripped version of TouchDelegate (had to extend it, since it unfortunetaly is no interface - setTouchDelegate only accepts TouchDelegate (sub)classes. Not 100% clean, but works great.
public class CustomTouchDelegate extends TouchDelegate {
private View mDelegateView;
public CustomTouchDelegate(View delegateView) {
super(new Rect(), delegateView);
mDelegateView = delegateView;
}
public boolean onTouchEvent(MotionEvent event) {
return mDelegateView.dispatchTouchEvent(event);
}
}
Then in my onLongClick method:
mButton.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// attach custom view to overlayContainer, simplified for demonstration
MyCustomView myMenuView = new MyCustomView()
mButton.setTouchDelegate(new CustomTouchDelegate(myMenuView));
// What's left out here is to mButton.setTouchDelegate = null,
// as soon as the temporary Overlay View is removed
overlayContainer.addView(myMenuView);
return true;
}
});
This way, all my ACTION_MOVE events from the Button are delegated to MyCustomView (and may or may not need some translation of the coordinates) - et voilà.
Thanks to pskink for the hint.

Android Touch event with selected frame

I have a view animator that has a lot Button on it. I've a OnTouchEvent for the view . codes works fine if I touch on space, but if I touch the button the code doesn't work. how can i fix it?
final View frame = (View)findViewById(R.id.viewAnimator1);
frame.setOnTouchListener(new OnSwipeTouchListener() {
public void onSwipeRight() {
viewAnimator.showPrevious();
}
public void onSwipeLeft() {
viewAnimator.showNext();
}}

You need to set on click listener for buttons, if all of them makes the same work, you can extend button class and implement on click listener and use it instead of normal button

How other buttons disable when I press the button?

I have a few imageview which have onclicklistener. If I press one (not release), I can press click others or I can click them same time. I do not want it. Everytime when I press one of them others should be disable to click.
imageview1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getMethod();
}
});
I guess, I tried setClickable(false); but it did not work properly, if I clicked one button after that it worked.

Try using onTouchListener instead of onClickListener and calling setEnabled(false); on the other views there. Here's a fairly basic example:
OnTouchListener onTouchListener = new OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
imageView1.setEnabled(false);
imageView2.setEnabled(false);
}
return true;
}
};
And then apply it to the image views with:
imageView1.setOnTouchListener(onTouchListener);
That should work. One thing is, though, that while you'll only be able to push one button no matter what, you also won't be able to push anything after you let go - but, you can fix that by adding some logic to see if the view actually got clicked or if the user touched it, changed their mind and slid away. The (event.getAction() == MotionEvent.ACTION_DOWN) check will be true even if the user is just scrolling.

//button on which press u want to disable others
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
button2.setEnabled(false); //button which u want to disable
button3.setEnabled(false); //button which u want to disable
}
});
//update fixed a spelling error

try to disable the button and
button.setEnable(false);
enable the button
button1.setEnable(true);

Handling touch events in order

I want to write a program that handles touch events in a specific order within a single activity.
For example:
A few views are shown.
If the user doesn't tap on the first view, I will show another activity.
If the user taps on it however, I want to detect a tap on the second, then the third, etc.
How can I handle multiple touch events?
I think I need an onTouchEvent method and in it I need an if-else statement for the first click but I don't know how I can monitor for the subsequent touch events.

It may help you.I always do like this
public void onClick(View v){
if(v==imageView1){
//do ssomething
}
if(v== imageView2){
//do something
}
if(v==imageView3){
//do something
}
like this u can do according to different button or imageview

I'm assuming the picture is an ImageView inside the main view. Why not just append touchlisteners to each view?

Set the onClickListener for the n+1 view only when nth view is clicked.
Like this
view1.setOnClickListener(new OnClickListener() {
void onClick(View v) {
view2.setOnclickListner(new Onclicklistener() {
void onClick(View v) {
// add further view's click listeners else do what ever if this
// is the last view.
}
});
}
});
Not an elegant solution but should work IMHO.

From your problem statement it seems you have an ordered list of views, each should have a touch listener, but the listener for the second view should not fire unless the listener for the first view has fired first.
This can easily be done by keeping a counter in your activity:
private int highestIndexTapped. When a view is tapped, check whether its index is such that index == highestIndexTapped + 1.
If it is, increase highestIndexTapped by 1 and fire the listener. Otherwise either eat the touch event or pass it on to the next part of your pipeline.

Android: long click on a button -> perform actions

I want to use the same button to perform 2 different methods.
One method when user single clicks it and a second method (different) when the user LONG clicks it.
I use this for the single short click (which works great):
Button downSelected = (Button) findViewById(R.id.downSelected);
downSelected.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
method();
}
}
});
I've tried to add a longClickListener but it didn't work.
Appreciate any ideas on how to solve this.
Thanks!

I've done it before, I just used:
down.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
return true;
}
});
Per documentation:
public void setOnLongClickListener
(View.OnLongClickListener l)
Since: API Level 1 Register a callback
to be invoked when this view is
clicked and held. If this view is not
long clickable, it becomes long
clickable.
Notice that it requires to return a boolean, this should work.

To get both functions working for a clickable image that will respond to both short and long clicks, I tried the following that seems to work perfectly:
image = (ImageView) findViewById(R.id.imageViewCompass);
image.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
shortclick();
}
});
image.setOnLongClickListener(new View.OnLongClickListener() {
public boolean onLongClick(View v) {
longclick();
return true;
}
});
//Then the functions that are called:
public void shortclick()
{
Toast.makeText(this, "Why did you do that? That hurts!!!", Toast.LENGTH_LONG).show();
}
public void longclick()
{
Toast.makeText(this, "Why did you do that? That REALLY hurts!!!", Toast.LENGTH_LONG).show();
}
It seems that the easy way of declaring the item in XML as clickable and then defining a function to call on the click only applies to short clicks - you must have a listener to differentiate between short and long clicks.

Initially when i implemented a longClick and a click to perform two separate events the problem i face was that when i had a longclick , the application also performed the action to be performed for a simple click . The solution i realized was to change the return type of the longClick to true which is normally false by default . Change it and it works perfectly .

Change return false; to return true; in longClickListener
You long click the button, if it returns true then it does the work. If it returns false then it does it's work and also calls the short click and then the onClick also works.

Try using an ontouch listener instead of a clicklistener.
http://developer.android.com/reference/android/view/View.OnTouchListener.html

The simplest and updated method is using a long click listener like
someView.setOnLongClickListener {
//do your work
true
}