Question

I’m tryin to draw a shape on a canvas under all buttons.
Here’s the code:

Paint paint = new Paint();
paint.setColor(R.color.Kolor);

View view; 
LayoutInflater inflater = (LayoutInflater)
getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
view = inflater.inflate(R.layout.menu_glowne, null);

Canvas can = new Canvas(Bitmap.createBitmap(300, 300, Bitmap.Config.ARGB_8888));
can.drawRect(0, 0, 200, 200, paint);

setContentView(view);

view.draw(can);

Don’t know why I’m still getting the layout without anything drawn underneath.
Any ideas on what I’m doing wrong?

Thanx in advance!

Answer 1

In your example you are drawing the view on your canvas rather than on canvas of the view.
You should use a simple approach, don’t inflate your layout but load it normally, then find the root container and set its background. Something like this:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Paint paint = new Paint();
    paint.setColor(Color.MAGENTA);
    Bitmap bgr = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888); 
    Canvas can = new Canvas(bgr);  
    can.drawRect(50, 50, 200, 200, paint);  
    LinearLayout ll = (LinearLayout) findViewById(R.id.ll); 
    ll.setBackgroundDrawable(new BitmapDrawable(bgr));    

}

main layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:id="@+id/ll">
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>