Draw Square on exist bitmap image

Question

I have a bitmap image and i want to draw a Square over this image for special position , i researched but i could not found any solution , all solutions are for create Square on empty view , please advise a i am beginner

public class DrawView extends View
{
    Paint paint = new Paint();

    public DrawView(Context context)
    {
        super(context);
    }


    @Override
    public void onDraw(Canvas canvas)
    {


        Paint myPaint = new Paint();
        myPaint.setColor(Color.WHITE);
        myPaint.setStyle(Paint.Style.STROKE);
        myPaint.setStrokeWidth(2);
        canvas.drawRect(10, 10, 100, 100, myPaint);


    }

}

should i convert my bit map image to convas?how?

http://stackoverflow.com/questions/19628797/draw-rectangle-over-imageview may be helps this — Rajan Bhavsar, May 04 '15 at 13:37

score 1 · Answer 1 · edited May 23 '17 at 12:28

Try this, It does what you want and some more:

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class DrawView extends View {
    Paint paint = new Paint();

    public DrawView(Context context) {
        super(context);            
    } 

    @Override 
    public void onDraw(Canvas canvas) {
        paint.setColor(Color.BLACK);
        paint.setStrokeWidth(3);
        canvas.drawRect(30, 30, 80, 80, paint);
        paint.setStrokeWidth(0);
        paint.setColor(Color.CYAN);
        canvas.drawRect(33, 60, 77, 77, paint );
        paint.setColor(Color.YELLOW);
        canvas.drawRect(33, 33, 77, 60, paint );

    } 

}

To draw it: import android.app.Activity; import android.graphics.Color; import android.os.Bundle;

public class StartDraw extends Activity {
    DrawView drawView;

    @Override 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        drawView = new DrawView(this);
        drawView.setBackgroundColor(Color.WHITE);
        setContentView(drawView);

    } 
}

Source: Android canvas draw rectangle

Draw Square on exist bitmap image

1 Answers1