Hello,

I want to draw the android widgets like edittext, progressbar or a textview in onDraw() method.

My Test activity sets a view by setContentView(xxx). The xxx class extends View class and it has a onDraw(Canvas canvas) method. So basically when i set, setContentView(xxx) this xxx-->onDraw() method should be invoked. Which is rightly happened and all i did in the onDraw() method is shown below.



What i expect to see is this above progress.draw(canvas) should invoke the ProgressBar.onDraw(canvas) method which they will be using to draw the progressbar. But it does not work as expected.

Can anyone help me to resolve this issue?

Thanks!

gsk123 wrote:Hello,

I want to draw the android widgets like edittext, progressbar or a textview in onDraw() method.

My Test activity sets a view by setContentView(xxx). The xxx class extends View class and it has a onDraw(Canvas canvas) method. So basically when i set, setContentView(xxx) this xxx-->onDraw() method should be invoked. Which is rightly happened and all i did in the onDraw() method is shown below.

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Using java Syntax Highlighting

1. ProgressBar progress;
2.  
3. protected void onDraw(Canvas canvas)
4. {
5.     int scrW  = getWidth();
6.     int scrH = getHeight();
7.     if(progress == null)
8.     {
9.          progress = new ProgressBar(test, null, android.R.attr.progressBarStyleHorizontal);
10.          progress.setLayoutParams(new AbsoluteLayout.LayoutParams(scrW, scrH, 0, 0));
11.          progress.setProgress(50);
12.          progress.setVisibility(View.VISIBLE);
13.     }
14.  
15.    //not only for progessbar also this case is applicable to edittext, textview and all type of widgets as well
16.     progress.draw(canvas);
17. }

Parsed in 0.032 seconds, using GeSHi 1.0.8.4

What i expect to see is this above progress.draw(canvas) should invoke the ProgressBar.onDraw(canvas) method which they will be using to draw the progressbar. But it does not work as expected.

Can anyone help me to resolve this issue?

Thanks!

You should call progress.invalidate(), or YourView.invalidate() at the end.

I tried to call progress.invalidate() and also invalidate from My Custom view (xxx) at the end of the onDraw() but it doesn't work.


Thanks for your help. Any other solutions?

Not right now... it should work with invalidate()...

invalidate() will force the widget/view to draw again. Right? but in this case we directly call the widget's onDraw() method by calling widget.draw(canvas) [progress.draw(Canvas)].

Atleast it should have painted once you know? Any help?

Hi can you please try this.



I tried with tv.invalidate() also tv.draw(canvas), the TextView tv which has the text "Welcome to Android" is not shown when we run this code.

Thanks!

Hi,
have u solved this problem?
if yes then please tell me. i also need to do this.

Thanks.

gsk123 wrote:
public class TestView extends View
{
private TextView tv;

public void onDraw(Canvas canvas)
{
super.onDraw(canvas);
//tv.draw(canvas);
tv.invalidate();

what makes you think the TextView is inside the TestView ? how to group view ? layout ?