Databases
StackOverflow2013
Postsdbo
PODrawing on RelativeLayout's Canvas behind all other views?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODrawing on RelativeLayout's Canvas behind all other views?
    primarykey
    data
    text
    <p>I'm using <code>RelativeLayout</code> to absolutely position some standard views (like <code>TextView</code>).</p> <p>What I'd like to do is to draw a custom line on this <code>RelativeLayout</code>'s <code>Canvas</code> using <code>Canvas.drawLine</code> that is drawn <em>behind</em> all its other subviews.</p> <p>These other subviews are added with explicitely defining <code>RelativeLayout.LayoutParams</code>, but I'd like to leave the decision of <em>where</em> to paint itself to my custom line.</p> <p>I tried wrapping this line in a CustomView with overloaded <code>View.onDraw(Canvas canvas)</code> method and simply adding the view <em>without</em> specifying any <code>LayoutParams</code>, so:</p> <pre><code>public class CustomView extends View { public CustomView(Context context, int x0, int y0, int x1, int y1) { super(context); setClickable(false); setBackgroundColor(Color.TRANSPARENT); } public void onDraw(Canvas canvas) { Log.i("myapp", "i'm not called! :(") Paint p = new Paint(); p.setColor(Color.BLACK); canvas.drawLine(x0, y0, x1, y1, p); } } </code></pre> <p>And usage:</p> <pre><code>CustomView v = new CustomView(MyActivity.this, 0, 0, 100, 100); relativeLayout.addView(v); </code></pre> <p>... but this <code>onDraw</code> method is never called.</p> <p>Is there a way to make this work?</p> <hr> <p><strong>Edit</strong>: works if I substitute:</p> <pre><code>relativeLayout.addView(v) </code></pre> <p>with</p> <pre><code>relativeLayout.addView(v, new RelativeLayout.LayoutParams(SOME_WIDTH, SOME_HEIGHT)); </code></pre> <p>The point is, I know neither <code>SOME_WIDTH</code>, nor <code>SOME-HEIGHT</code> at that point.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMichal Rus
    1. USMichal Rus
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COextend RelativeLayout, not View
      singulars
      1. PODrawing on RelativeLayout's Canvas behind all other views?
      1. USpskink
    2. CO@pskink, this wouldn't be a good, hm, *decompositional* choice for my app's "logic". These lines are important elements on their own and their placement depends on placement of other subviews of a normal Layout.
      singulars
      1. PODrawing on RelativeLayout's Canvas behind all other views?
      1. USMichal Rus
    3. COhmmm, i dont understand, if it depends on child views then itrrate over them in RelativeLayout and get yheir positions getTop/getLeft etc
      singulars
      1. PODrawing on RelativeLayout's Canvas behind all other views?
      1. USpskink
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload