What is the difference between a view's onTouchEvent
:
public class MyCustomView extends View {
// THIS :
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
}
and its onTouchListener
:
MyCustomView myView = (MyCustomView) findViewById(R.id.customview);
myView.setOnTouchListener(new View.OnTouchListener() {
@Override
public void onClick(View arg0) {
// do something
}
});
or
public class MyCustomView extends View {
public MyCustomView(Context context, AttributeSet attrs) {
// THIS :
setOnTouchListener(new View.OnTouchListener() {
@Override
public void onClick(View arg0) {
// do something
}
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
}
If this two is different,
Do we need to implement both ?
Which one is invoked first ?
If I have some scrolling and zooming functionality, should I implement them inside onTouchEvent
or onTouchListener
?
Answer by LeeYiHong is correct, and the other very important thing is what is written at http://developer.android.com/reference/android/view/View.OnTouchListener.html:
I am not sure if you had found your answer. But I found related questions similar to yours.
"onTouch works everywhere you want (whether it is in activity or view) as long as you have declared the interface and put the Listener right! On the other hand, onTouchEvent only works inside a View!"
For scrolling and zooming functionality, I guess onTouchListener will be enough to complete both function (and many more like rotation etc).