Question

I have a layout (which extends a framelayout) with a gridview and an imageview. I scroll through the layout with an onTouchListener,. In my Galaxy Nexus it works fine, but in AVD and other devices (Galaxy SII for example) the view shakes and I can’t find out why.

XML

<paricio.toni.caththemole.MyFrameLayout
    android:id="@+id/campo"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/zonaMarcador" >
    <ImageView
        android:id="@+id/fondo"
        android:layout_width="800dp"
        android:layout_height="800dp"
        android:contentDescription="@android:string/untitled"
        android:src="@drawable/terrenoarena" />
    <GridView
        android:id="@+id/gridView1"
        android:layout_width="640dp"
        android:layout_height="640dp"
        android:layout_gravity="center"
        android:clickable="true"
        android:columnWidth="80dp"
        android:horizontalSpacing="0dp"
        android:numColumns="8"
        android:overScrollMode="never"
        android:scrollbars="none"
        android:stretchMode="columnWidth"
        android:verticalSpacing="0dp" >

    </GridView>

And setOnTouchListener code:

    gridview.setOnTouchListener(new OnTouchListener() { 
        public boolean onTouch(View v, MotionEvent event) {
            int desplazamiento[]={0,0};
            campo.getLocationOnScreen(desplazamiento);
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    mx = event.getX();
                    my = event.getY();
                    return false;
                case MotionEvent.ACTION_MOVE:
                    curX = event.getX();
                    curY = event.getY();
                    campo.scrollBy((int) (mx - curX), (int) (my - curY));                 
                    mx = curX;
                    my = curY;
                    return false;
                case MotionEvent.ACTION_UP:
                    curX = event.getX();
                    curY = event.getY();
                    campo.scrollBy((int) (mx - curX), (int) (my - curY));
                    return false;
            }
            return false;
        }
    });

MyFrameLayout is a FrameLayout extended to be bigger than the screen:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(0, 0);
}

I can scroll an ImageView in AVD without shake, but if I move the image and gridview (instead of the frame) the views move differently (and wrong). I have tried many things but I can’t avoid the shake. ¿Any idea?

Thanks.

Answer 1

I solved shake moving contents:

    gridview.setOnTouchListener(new OnTouchListener() { 
        public boolean onTouch(View v, MotionEvent event) {
            int desplazamiento[]={0,0};
            fondo.getLocationOnScreen(desplazamiento);
            Log.i("miTraza","touch event");
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Log.i("miTraza","touch event down");
                    mx = event.getX();
                    my = event.getY();
                    return true;
                case MotionEvent.ACTION_MOVE:
                    Log.i("miTraza","touch move");
                    curX = event.getX();
                    curY = event.getY();
                    fondo.scrollBy((int) (mx - curX), (int) (my - curY));
                    gridview.scrollBy((int) (mx - curX), (int) (my - curY));
                    mx = curX;
                    my = curY;
                    return true;
                case MotionEvent.ACTION_UP:
                    Log.i("miTraza","touch up");
                    curX = event.getX();
                    curY = event.getY();
                    fondo.scrollBy((int) (mx - curX), (int) (my - curY));
                    gridview.scrollBy((int) (mx - curX), (int) (my - curY));
                    return true;
            }
            return false;
        }
    })

Now gridview and imageview moves together without shakes, I had a problem with onItemClick with gridview but this is another history.

Thanks to android developer for your help.