Hi all,
So I have an activity which is a Canvas. I wanted to put a button on
it. I'm able to do that, but several problems happened :
1) When I want to do button.setText("name"); -> there is a force close
of the app, with the following error :
NullPointer exception on the line calling the setText() method. BUT if
I just do : button.setEnabled(false);
there is no problem..
2) When I tried to implements the click on the button, nothing
happened and I don't really understand why..
Here is the code I've done :
public class MyView extends View implements View.OnClickListener{
....
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
undo_Btn.draw(canvas);
undo_Btn.setOnClickListener(this);
invalidate();
}
......
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case 1 : Toast.makeText(this.getContext(), "Click",
Toast.LENGTH_SHORT).show();
break;
}
}
..}
This View is an inner class of my activity displaying a dialog
interface given the ability to paint things with finger.
So, I need your help to know why I can't change the name of the
button, although it is an existing button, and why the click is not
detected.
I tried to create a new view extending GroupView, to put my button
below the Canvas, but it is not really working.
I think it could be a lot better if I have my view containing only the
canvas, and a button below that view, with all these components in a
relative view, but all my attempts failed.
Hope I'm clear with my problem.
Thank you,
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