How to Resize the view in Android using Touch events

Question

I have drawn few concentric circles and now i wish to bring some touch events such that when i can resize(Expand / Shrink) the circles as a whole. Is it possible to do so ?..

This is the view that i have drawn..

// DrawCircles.java

class DrawCircles extends View {

 private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

public DrawCircles(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
}


protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeWidth(2);
    mPaint.setColor(0xFF000000);
    int px = getMeasuredWidth() >>1;
    int py = getMeasuredHeight()>>1 ;
    int radius = Math.min(px, py);
    int diff = radius/6;
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFFFFFFF);
    canvas.drawCircle(px, py, radius-2, mPaint);
    radius-=diff;
    mPaint.setColor(0xFF000000);
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFFFFFFF);
    canvas.drawCircle(px, py, radius-2, mPaint);
    radius-=diff;
    mPaint.setColor(0xFF000000);
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFFFFFFF);
    canvas.drawCircle(px, py, radius-2, mPaint);
    radius-=diff;
    mPaint.setColor(0xFF000000);
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFFFFFFF);
    canvas.drawCircle(px, py, radius-2, mPaint);
    radius-=diff;
    mPaint.setColor(0xFF000000);
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFFFFFFF);
    canvas.drawCircle(px, py, radius-2, mPaint);
    radius-=diff;
    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setColor(0xFFFF0000);
    canvas.drawCircle(px, py, radius, mPaint);
    radius-=(diff/2);
    mPaint.setColor(0xFFC11B17);
    canvas.drawCircle(px, py, radius, mPaint);
    mPaint.setColor(0xFFCFCFCF);

        super.onDraw(canvas);
}

}

Please let me know, whether it is possible, if so please provide some resources of the same...

Thanks in Advance

Answer 1

try this link

Programmatically resize of view depends on android version?