Hi,
If I want to redraw a drawable currently on screen how should I go about it?
Looking at the sample code, most seem to programaticaly define a nested
class which extends view.
The Lunar launch pad defines a separate class which extends SurfaceView and
doesn't override OnDraw();
I currently use a separate class;
In main.xml
...
<uk.ac.ic.doc.gea05.miffed.CustomView
android:id="@+id/customView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
...
public class CustomView extends View {
private Drawable droid;
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
Resources res = context.getResources();
droid = res.getDrawable(R.drawable.android);
}
@Override
protected void onDraw(Canvas canvas){
canvas.drawColor(Color.MAGENTA);
droid.draw(canvas);
}
}
The canvas gets drawn as MAGENTA but the little droid png doesn't get drawn,
I thought it might be a Z axis issue but even without the magenta line he's
still hiding. If I set the resource as the src for an ImageView in the XML
layout then it displays fine.
Ultimately I don't know if this is the right way to go about what I want
to achieve.
Imagine you were going to write an app that displayed a picture and when you
clicked the picture it changed to a different picture, or a monochrome
version of the same picture. How would you go about it?
I don't know where the responsibility lies in the code at the moment, can I
reuse ImageViews for different images? If I can change the picture
referenced how do I force a redraw? Is it possible to do this using the XML
layout to specify the Custom / Image / Surface View? Because the simpler
examples do this programaticaly.
Many thanks for your help,
Gav
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