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PODrawing touchable layers with android
 

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    <p>I want to create a simple drawing application. I want to be able to add somme lines, circles and rectangles. And I want to select any shape and move it. I've tried this way :<br> - add a view per shape, and draw the shape in the onDraw method of the view<br> - add each views to a relative layout </p> <p>I can see all the shapes, but I can only touch the first view, because it fills all the screen. I searched in the samples an example of a "layered" app, but without success</p> <p>Thks :)</p> <p><strong>Edit</strong> : Code added.<br> If I click on the rectangle, I can see the log, but if I click on the circle, there's no log.</p> <p><strong>Edit 2</strong> : Oups, I forgot to attach the listener in the Circle... :( sorry</p> <p>The layout :</p> <pre><code>public class DrawingView extends RelativeLayout { public DrawingView(Context context) { super(context); this.setBackgroundColor(0xFFFFFFFF); this.addView(new Circle(context)); this.addView(new Rectangle(context)); } } </code></pre> <p>The Circle :</p> <pre><code>public class Circle extends View implements View.OnTouchListener { private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); public Circle(Context context) { super(context); this.paint.setStyle(Paint.Style.STROKE); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { this.setMeasuredDimension(100, 100); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawCircle(50, 50, 50, this.paint); } @Override public boolean onTouch(View v, MotionEvent event) { Log.d("myApp", "cercle"); return false; } } </code></pre> <p>And the rectangle :</p> <pre><code>public class Rectangle extends View implements View.OnTouchListener { private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); public Rectangle(Context context) { super(context); this.paint.setStyle(Paint.Style.STROKE); this.setOnTouchListener(this); this.setX(50); this.setY(50); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { this.setMeasuredDimension(100, 100); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawRect(0, 0, 100, 100, this.paint); } @Override public boolean onTouch(View v, MotionEvent event) { Log.d("myApp", "Rectangle"); return false; } } </code></pre>
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    1. COhow could android tell the difference between a touch on the top layer and "oh, this person must've really wanted to touch the 3rd from bottom layer"?
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      1. USMarc B
    2. COHmm, thks for the irony. With flash it's very easy, I juste have to add a "clip" per shape and attach a listener on it.
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    3. COWhy does the view fill the screen? If you set the dimensions correctly, it won't.
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