How can I detect multitouch events? The code im trying is:
ImageView im = (ImageView) findViewById(R.id.imageView1);
im.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
Log.e("case MotionEvent.ACTION_POINTER_DOWN","case MotionEvent.ACTION_POINTER_DOWN");
break;
case MotionEvent.ACTION_DOWN:
Log.e("case MotionEvent.ACTION_DOWN","case MotionEvent.ACTION_DOWN");
break;
case MotionEvent.ACTION_UP:
Log.e("case MotionEvent.ACTION_UP","case MotionEvent.ACTION_UP");
break;
case MotionEvent.ACTION_MOVE:
Log.e("case MotionEvent.ACTION_MOVE","case MotionEvent.ACTION_MOVE");
break;
}
return false;
}
});
It detects the first touch and the output in the log cat is MotionEvent.ACTION_POINTER_DOWN. How to know whether a second touch has taken place?
There are many ways to do it, so u can choose one of many here some link have write a complete application to handle multi touch.
multitouch
multi-touch-handling
You should add follwing line to imageView1 in your xml layout file:
android:longClickable="true"
This will enable long clicks and other events will be received too.
Related
I want a button that can detect multiple fingers. Like ı am holding with 1 finger and then 1 more finger touches that button it has to detect that.
Or
a button that when pushed, automatically release that button dont care if it actually released or not.
I use onTouchevent for multiple buttons for my drum kit project.
#Override
public boolean onTouch(View view, MotionEvent motionEvent)
{
Animation zoomIn = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.zoomin);
switch (motionEvent.getAction())
{
case MotionEvent.ACTION_DOWN:
switch(view.getId())
{
case R.id.BassL:
findViewById(R.id.bass).startAnimation(zoomIn);
sp.play(BassD,1.0f,1.0f,0,0,1.0f);
break;
case R.id.BassR:
findViewById(R.id.bass).startAnimation(zoomIn);
sp.play(BassD,1.0f,1.0f,0,0,1.0f);
break;
case R.id.SnareL:
findViewById(R.id.snare).startAnimation(zoomIn);
sp.play(SnareD,1.0f,1.0f,0,0,1.0f);
break;
case R.id.SnareR:
findViewById(R.id.snare).startAnimation(zoomIn);
sp.play(SnareD,1.0f,1.0f,0,0,1.0f);
break;
case R.id.OpenHihat:
findViewById(R.id.hihat).startAnimation(zoomIn);
sp.stop(OpenH);
sp.play(OpenH,1.0f,1.0f,0,0,1.0f);
break;
case R.id.CloseHihat:
findViewById(R.id.hihat).startAnimation(zoomIn);
sp.play(CloseH,1.0f,1.0f,0,0,1.0f);
break;
case R.id.RideSurface:
findViewById(R.id.ride).startAnimation(zoomIn);
sp.stop(RideS);
sp.play(RideS,1.0f,1.0f,0,0,1.0f);
break;
case R.id.RideTop:
findViewById(R.id.ride).startAnimation(zoomIn);
sp.play(RideT,1.0f,1.0f,0,0,1.0f);
break;
}
}
return true;
}
}
You can check the pointer id associated to the MotionEvent you've just received.
See the docs for more info:
https://developer.android.com/reference/android/view/MotionEvent.html#getPointerId(int)
I have a RelativeLayout with a single ImageView inside of it. The ImageView has an OnTouchListener attached to it which is working perfectly fine if I just press the ImageView. The problem I'm having though is that if I press and hold in the empty space outside of the ImageView and then try to press the ImageView the touch listener doesn't fire. It seems like the layout is absorbing the touch events somehow. Any ideas on how I could fix this?
The action defined by you here is a Multi-touch gesture. Go through this doc to know how to handle this type of actions.
Also take a look at the ACTION_POINTER_DOWN action define in MotionEvent. This is the event that will get called when additional fingers come down.
you mout use this code:
imageView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
//your code
break;
case MotionEvent.ACTION_UP:
//your code
break;
case MotionEvent.ACTION_MOVE:
//your code
break;
default:
//your code
break;
}
return true;
}
});
i'am using imageview on touch listener in this motion event not working why this happen any one have idea regarding this help me.
here is my code
img_View11.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
Log.i("img_View11", "img_View11 _1");
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
Log.i("img_View11", "img_View11 _2");
break;
case MotionEvent.ACTION_MOVE:
Log.i("img_View11", "img_View11 _3");
break;
case MotionEvent.ACTION_UP:
Log.i("img_View11", "img_View11 _4");
break;
}
return false;
}
});
here my out put show like this img_View11_1 and two img_View11_2
Log.i("img_View11", "img_View11 _1");
Log.i("img_View11", "img_View11 _2");
Question: Why MotionEvent.ACTION_MOVE and MotionEvent.ACTION_UP not working ?
Change "return false;" to "return true;" so that it will continue to receive calls.
Is it possible to detect anytime a user moves their finger off of a button after they have been pressing down on it?
I have determined that onTouchListener will get an action when the user moves off of the button vertically (It gives an action: ACTION_CANCEL), but I have not been able to find a way to determine when a user moves off the button horizontally.
public boolean onTouch(View arg0, MotionEvent arg1) {
switch(arg1.getAction()){
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
switch(arg0.getId()){
case R.id.my_button:
button.setBackgroundResource(R.drawable.untouched);
break;
}
break;
case MotionEvent.ACTION_DOWN:
switch(arg0.getId()){
case R.id.my_button:
button.setBackgroundResource(R.drawable.touched);
break;
}
break;
}
return false;
}
Try go next:
arg1.getX();
arg1.getY();
arg1 - is from your code
Here you can get coordinates of MotionEvent. Next you will do anything with this coordinates
Hope, it help you
I understand calling onTouchEvent from views to get the location of the last touch as a motion event. How the heck can I tell that a fingure is down on the screen and has not been lifted and when the finger is lifted?
For instance there is onKeyDown and onKeyUp for use when you are dealing with keyboard input. So how can I find out when on fingureUp happens?
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_POINTER_DOWN:
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
case MotionEvent.ACTION_MOVE:
// Etc...
}
}
Then just fill in the cases with what you want to happen on these events.
onTouchListener got a parameter which is typed MotionEvent. Where you can getAction() to know if it is UP or DOWN or else.