Multiple Rectangle drawing programmatically

Question

enter image description here

I am trying to draw this kind of rectangle but i am unable to do it. I tried to put inside of a loop but id does not show anything. My code snippet is below:

 public class MainActivity extends ActionBarActivity {
    DrawView drawView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    drawView = new DrawView(this);
    drawView.setBackgroundColor(Color.WHITE);
    setContentView(R.layout.activity_main);


    }
 }

DrawView class:

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


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

@Override
public void onDraw(Canvas canvas) {
    int l=50;
    int t=50;
    int r=100;
    int b=100;

    for(int i=0;i<1;i++){
        paint.setColor(Color.BLACK);
        paint.setStrokeWidth(3);
        canvas.drawRect(l, t, r, b, paint);
        paint.setColor(Color.WHITE);
        canvas.drawRect(l+3, t+3, r-3, b-3, paint);

        t=t+150;
        b=b+150;
        invalidate(l, t, r, b);
    }

Let me see if it works – Omar Faroque Anik Dec 10 '14 at 17:30 — Omar Faroque Anik, Dec 10 '14 at 17:30

score 1 · Answer 1 · answered Dec 10 '14 at 17:24

1

Your DrawView instance is not added to your activity layout.

Try:

setContentView(drawView);

answered Dec 10 '14 at 17:24

hasan

23,815
10
63
101

I just figure noticed that issue. Thanks anyway. I am accepting your answer – Omar Faroque Anik Dec 10 '14 at 17:29

score 1 · Answer 2 · answered Dec 10 '14 at 18:01

1

Your version of onDraw() will not work. You call invalidate() in the loop. invalidate() results in a call to onDraw(). So your onDraw() call is effectively recursive.

answered Dec 10 '14 at 18:01

griffinjm

493
2
10

Multiple Rectangle drawing programmatically

2 Answers2