CODEWITHSUNDEEP
androidandroid-canvas
Vivek Kalkur
Vivek Kalkur

Reputation: 2186

In my Android app,how do I move the images from their position?

I have a class Panel which overrides onDraw() method as below.I have two images mentioned in canvas.drawBitmap(),as of now their position is fixed. Is it possible for me to move these two images from bottom to top on my emulator? Code is:

class Panel extends View {
    public Panel(Context context) {
        super(context);
    }

    @Override
    public void onDraw(Canvas canvas) {
        Bitmap image1 = BitmapFactory.decodeResource(getResources(), R.drawable.btnpre);
        canvas.drawColor(Color.CYAN);
        canvas.drawBitmap(Image1, 10, 10, null);
        Bitmap Image2 = BitmapFactory.decodeResource(getResources(), R.drawable.btnpre);
        canvas.drawBitmap(Image2, 100, 100, null);

    }
 }

Upvotes: 1

Views: 593

Answers (2)

Madhusudhan
Madhusudhan

Reputation: 156

use variables in onDraw call for values of x,y where you want to draw. I modified your code to redraw itself to new coordinates after 10 seconds of first draw call. It will give you an idea to use variables inside draw call to dynamically change where you draw. Hope I have answered your question

class Panel extends View {
    public Panel(Context context) {
        super(context);
    }

    Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            x1 = 20;
            y1 = 20;

            x2 = 120;
            y2 = 120;
            invalidate();
        }
    }
    private int x1 = 10;
    private int y1 = 10;

    private int x2 = 100;
    private int y2 = 100;
    private boolean drawAfterTenSecs = false;


    @Override
    public void onDraw(Canvas canvas) {
        Bitmap image1 = BitmapFactory.decodeResource(getResources(), R.drawable.btnpre);
        canvas.drawColor(Color.CYAN);
        canvas.drawBitmap(Image1, x1, y1, null);
        Bitmap Image2 = BitmapFactory.decodeResource(getResources(), R.drawable.btnpre);
        canvas.drawBitmap(Image2, x2, y2, null);
        if(!drawAfterTenSecs) {
            handler.sendEmptyMessageDelayed (-1, 10000)
            drawAfterTenSecs = true;
        }
    }

 }

Upvotes: 0

Jett Hsieh
Jett Hsieh

Reputation: 3159

Re-write your code like this canvas.drawBitmap(Image1, x, y, null);.

And write a thread to change the value of x or y over time.

Once you change the value of x or y, please call invalidate in your Panel.java to redraw the view.

Upvotes: 1

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