Develop Reference

To Get focus on both Listview and image button?

In a Custom ListView extending Cursoradapter, I need both Listview and image button to get focussed. How to do it?

Implement your own OnTouchListener for ListView which conditional return values. If you return TRUE from onTouch, the system will assume that the onTouch was handled and it won't handle it by itself. If you return FALSE from onTouch, system will assume that the OnTouchListener did not handle the touch events and will do further processing. This way you can manage how the touch / click should work with ImageButton in a ListView.
I don't know what exactly your implementation is. But it may give you a little idea...
boolean pressedImageButton = false;
myListView.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch(action)
{
case MotionEvent.ACTION_DOWN:
float positionX = event.getRawX();
float positionY = event.getRawY();
if(some conditions with positionX and positionY)
pressedImageButton = true;
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
if(pressedImageButton)
myImageButton.performClick(); // or whatever action you want to perform on that ImageButton
pressedImageButton = false;
break;
}
}
});
I hope this helps. :)

How do I detect if a user has touched any part of the screen other than the inside of an EditText?

I am guessing this means making the whole screen touchable. How exactly is that done?
and secondly calculating if an X,Y is within the EditText.

override the onTouchEvent in the activity you want to implement this....and get the X, Y co-ordinates using event.getX() and event.getY()
#Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int)event.getX();
int y = (int)event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
}
return false;
}
but i suggest you must search thoroughly before posting a question.

Correctly detecting a swipe on a GridView placed inside a ViewPager in Android

I have a ViewPager which uses GridViews for pages. I would like the ViewPager to switch pages when I swipe across the screen.
The problem is that swipes are not detected when they are made across the GridView. Outside of the GridView, the swipes work correctly; it seems that the GridView is trapping all touch events without passing it to ViewPager first.
While fiddling with the source code, I did this to a custom class extended from GridView:
#Override
public boolean onTouchEvent(MotionEvent event) {
return pager.onInterceptTouchEvent(event);
}
-- where pager refers to the ViewPager class. With this, ViewPager will correctly detect swipes and move pages accordingly, but it doesn't allow GridView to accept any events, so I can't click on the items.
What I would like to be able to do is correctly detect swipes in ViewPager and item clicks on GridView.

I had trouble with colig's implementation, but I was able to get it to work by subclassing ViewPager and overriding the onInterceptTouchEvent() method. I only checked for swipes in the X direction to allow for vertical scrolling if necessary.
private static final int minSwipeDistance = 30;
private float mTouchX;
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
boolean response = super.onInterceptTouchEvent(event);
float x = event.getX();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mTouchX = x;
break;
case MotionEvent.ACTION_MOVE:
float dX = Math.abs(x - mTouchX);
if (dX > minSwipeDistance)
return true;
break;
}
return response;
}

Alix is on the right track. I managed to come up with this simple-looking fix. I'm not entirely sure of how it works, but it does! And for future reference, it works for other kinds of views too -- TableLayout, for example -- not just GridView.
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
x = event.getX();
y = event.getY();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
downX = x;
downY = y;
return super.onInterceptTouchEvent(event);
}
case MotionEvent.ACTION_MOVE: {
deltaX = Math.abs(downX - x);
deltaY = Math.abs(downY - y);
return super.onTouchEvent(event);
}
case MotionEvent.ACTION_UP: {
if (deltaX > 4 && deltaY > 4) {
super.onTouchEvent(event);
}
}
}
return super.onInterceptTouchEvent(event);
}

You can override onInterceptTouchEvent for dispatch evenement where you want

Android: How do I move cursor on touch?

Here is my scenerio. Wherever you touch my screen, an circle is drawn, and when you lift your finger/stylus of the screen, the circle disappears. This is fine, but the problem now is if you touch, then move, the circle will not update to the new position of your finger/stylus. It will just stay at the original touch position regardless of movement until you lift your finger/stylus off the screen.
How am I able to get the circle(cursor) to redraw or move itself to the new position of your finger/stylus? Here is my code:
rLO.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
cursor.x = (int)event.getX() - (cursor.radius / 2);
cursor.y = (int)event.getY() - (cursor.radius / 2);
cursor.onDraw(cursor.e);
rLO.addView(cursor);
break;
case MotionEvent.ACTION_UP:
rLO.removeView(cursor);
break;
case MotionEvent.ACTION_MOVE:
}// end switch
return true;
}
});
Thanks in advance!

Is there a way in android to get the area (a collection of points) of my finger

Is there a way in android to get the area (a collection of points) of my finger when i touch the screen. Usually, the return is one point location. I need to get the several points which can represent the area of my touching. Any one knows? Thnaks

Just use View class's onTouchEvent() or implements OnTouchListener in your activity and get the X and Y co-ordinates like,
This is View class's OnTouchEvent()..
#Override
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
float x = ev.getX();
float y = ev.getY();
break;
}
case MotionEvent.ACTION_MOVE: {
float mLastTouchX = x;
float mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
break;
}
case MotionEvent.ACTION_CANCEL: {
break;
}
case MotionEvent.ACTION_POINTER_UP: {
break;
}
}
return true;
}
EDIT:
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final TextView textView = (TextView)findViewById(R.id.textView);
// this is the view on which you will listen for touch events
final View touchView = findViewById(R.id.touchView);
touchView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
textView.setText("Touch coordinates : " +
String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));
return true;
}
});
}
For more details Android - View.

Does it have to be the real shape of the finger? Otherwise you could calculate a circle around the center of the touch.

I believe this is not possible in the touch's coordinate along with it's area. It's natively unsupported by Android API.
Ref:
http://developer.android.com/guide/topics/ui/ui-events.html
http://developer.android.com/reference/android/gesture/package-summary.html

Unfortunately not. I ran in to this a while ago - you could try normalising the data over several 'frames'. May be worth trying to figure out why you need an exact point, or set of points, and find another way of doing it.