Question

I am using the android touch sample from android developers blog, but the touch is work for any location on the screen not only on the view that has the touch :
The use code is :

package pit.opensource.touch;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;

public class TouchExampleView extends View {
    private static final int INVALID_POINTER_ID = -1;

    private Drawable mIcon;
    private float mPosX;
    private float mPosY;

    private float mLastTouchX;
    private float mLastTouchY;
    private int mActivePointerId = INVALID_POINTER_ID;

    View currentView;

    private ScaleGestureDetector mScaleDetector;
    private float mScaleFactor = 1.f;

    public TouchExampleView(Context context) {
        this(context, null, 0);

        currentView = this;

    }

    public TouchExampleView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TouchExampleView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mIcon = context.getResources().getDrawable(R.drawable.ic_launcher);
        mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight());

        mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // Let the ScaleGestureDetector inspect all events.
        mScaleDetector.onTouchEvent(ev);

        final int action = ev.getAction();
        switch (action & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN: {
            final float x = ev.getX();
            final float y = ev.getY();



            int viewTop = currentView.getPaddingTop();
            int viewLeft = currentView.getPaddingLeft();

            int viewWidth = currentView.getWidth();
            int viewHeight = currentView.getHeight();

            Log.d("Top",viewTop+"");
            Log.d("Left",viewLeft+"");
            Log.d("Width",viewWidth+"");
            Log.d("Height",viewHeight+"");

            if(x>(viewLeft + viewWidth) || y>(viewTop+viewHeight)) 
            {
                return false; 
            }else{
                mLastTouchX = x;
                mLastTouchY = y;
                mActivePointerId = ev.getPointerId(0);
            }


            break;
        }

        case MotionEvent.ACTION_MOVE: {
            final int pointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(pointerIndex);
            final float y = ev.getY(pointerIndex);

            // Only move if the ScaleGestureDetector isn't processing a gesture.
            if (!mScaleDetector.isInProgress()) {
                final float dx = x - mLastTouchX;
                final float dy = y - mLastTouchY;

                mPosX += dx;
                mPosY += dy;

                invalidate();
            }

            mLastTouchX = x;
            mLastTouchY = y;

            break;
        }

        case MotionEvent.ACTION_UP: {
            mActivePointerId = INVALID_POINTER_ID;
            break;
        }

        case MotionEvent.ACTION_CANCEL: {
            mActivePointerId = INVALID_POINTER_ID;
            break;
        }

        case MotionEvent.ACTION_POINTER_UP: {
            final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                    >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
                    final int pointerId = ev.getPointerId(pointerIndex);
                    if (pointerId == mActivePointerId) {
                        // This was our active pointer going up. Choose a new
                        // active pointer and adjust accordingly.
                        final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
                        mLastTouchX = ev.getX(newPointerIndex);
                        mLastTouchY = ev.getY(newPointerIndex);
                        mActivePointerId = ev.getPointerId(newPointerIndex);
                    }
                    break;
        }
        }

        return true;
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.save();
        canvas.translate(mPosX, mPosY);
        canvas.scale(mScaleFactor, mScaleFactor);
        mIcon.draw(canvas);
        canvas.restore();
    }

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            mScaleFactor *= detector.getScaleFactor();

            // Don't let the object get too small or too large.
            mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));

            invalidate();
            return true;
        }
    }
}

Answer 1

Implement the View.OnTouchListener for the view that you want to handle the touch event.

Otherwise, call getDrawingRect(Rect outRect) to get the view bounds. Then check if this view bounds contain the touch point coordinates using outRect.contains(touchX, touchY).