Zoom and Pinch RelativeLayout

Question

I am new to android development, sorry if I ask some stupid question please try to help me. I am trying to implement the Zoom and pinch in RelativeLayout. I want to make my own map view in which I'll get the image of floor map and draw the pins(ImageVIew) on it. I've tried it out but i am currently unable to click on the pins. I've done the code with the help of these posts

Extending RelativeLayout, and overriding dispatchDraw() to create a zoomable ViewGroup

and

Android - zoom in/out RelativeLayout with spread/pinch

My Code is

public class TempView extends RelativeLayout {
private static final int INVALID_POINTER_ID = -1;

private Drawable mIcon;
private float mPosX;
private float mPosY;
TempView temp;
private float mLastTouchX;
private float mLastTouchY;
private int mActivePointerId = INVALID_POINTER_ID;

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

public TempView(Context context) {
    this(context, null, 0);
    temp = this;
}

public TempView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
    temp = this;
}

public TempView(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());
    temp = this;
    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();

        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
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
    int count = getChildCount();
    Log.d("onLayout", ""+count);
    for(int i=0;i<count;i++){
        View child = getChildAt(i); 
        if(child.getVisibility()!=GONE ){
            RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)child.getLayoutParams();
            child.layout(
                (int)(params.leftMargin * mScaleFactor), 
                (int)(params.topMargin * mScaleFactor), 
                (int)((params.leftMargin + child.getMeasuredWidth()) * mScaleFactor), 
                (int)((params.topMargin + child.getMeasuredHeight()) * mScaleFactor) 
                );


                child.setLayoutParams(params);
        }
    }
}




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

    canvas.save(Canvas.MATRIX_SAVE_FLAG);
    canvas.translate(mPosX, mPosY);
    canvas.scale(mScaleFactor, mScaleFactor);
    Log.d("onDraw", ""+mScaleFactor);
    int count = getChildCount();
    for(int i=0;i<count;i++){
        View child = getChildAt(i); 
        if(child.getVisibility()!=GONE){
            child.draw(canvas);
            Log.d("onDraw", ""+mScaleFactor);
        }
    }

    canvas.restore();
}
@Override
protected void dispatchDraw(Canvas canvas) {
    canvas.save(Canvas.MATRIX_SAVE_FLAG);

    canvas.translate(mPosX, mPosY);
    canvas.scale(mScaleFactor, mScaleFactor);

    super.dispatchDraw(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(1.0f, Math.min(mScaleFactor, 5.0f));
       // Log.d("onScale", ""+mScaleFactor);
        temp.invalidate();
        invalidate();
        return true;
    }
}
}

Questions:

• How to make Only Floor Map Image to zoom?
• Keep Pins non-zoom but Move Relatively?
• Get Accurate Click Event when clicked on a pin

Any Suggestions and Answers will be very much appriciated!

Thanks in Advance,

Qamar

Answer 1

An implementation of an HTML map like element in an Android View:

• Supports images as drawable or bitmap in layout
• Allows for a list of area tags in xml
• Enables use of cut and paste HTML area tags to a resource xml (ie, the ability to take an HTML map - and image and use it with minimal editing)
• Supports panning if the image is larger than the device screen
• Supports pinch-zoom
• Supports callbacks when an area is tapped.
• Supports showing annotations as bubble text and provide callback if the bubble is tapped

see this link you will got your solution https://github.com/catchthecows/AndroidImageMap