Android2D Display size

When drawing something with Android2D, the important point is display size(canvas size).

To decide point to draw, and to arrange shapes in canvas, display size is important.

We have 2 types of size.

  • Canvas size
  • Display size

Which is better to use? Good question. But it depends on your settings.


Please check your results.

public class MultiLineDemoView extends View
    private Paint paint;
    private int screenWidth;        // width
    private int screenHeight;       // height
    private static final String TAG = "MultiLineDemoView";
    public MultiLineDemoView ( Context context )
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    protected void onSizeChanged ( int w, int h, int oldw, int oldh )
        super.onSizeChanged(w, h, oldw, oldh);
        this.screenWidth = w;
        this.screenHeight = h;
    protected void onDraw ( Canvas canvas )
        Log.d(TAG, "Width: " + screenWidth);
        Log.d(TAG, "Height: " + screenHeight); // just fit
        // Get Width and Height from canvas
        int canvasWidth = canvas.getWidth();
        int canvasHeight = canvas.getHeight();
        Log.d(TAG, "Canvas Width: " + canvasWidth);
        Log.d(TAG, "Canvas Height: " + canvasHeight);