How to programmatically change the background image of an Android Activity

Question

I have been able to change colour of an activity background (see this post). Now a requirement is to do the same with background image. I mean I can click a button, select an op

Answer 1

When you are setting background after selecting from Dialog then you are getting the resource id R.drawable.pix2 and retrieving the BitmapDrawable as follows...

wvContent.setBackgroundColor(0);
BitmapDrawable bg = (BitmapDrawable)getResources().getDrawable(R.drawable.pix2);
bg.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT);
wvContent.setBackgroundDrawable(bg);                    
bg_color=R.drawable.pix2;

But in onCreate() method you are just passing the resource id as below...

wvContent.setBackgroundColor(getSelectedItem());

where, getSelectedItem() returns an int value which is a resource id.

Now, set background drawable as follows in onCreate() method...

wvContent.setBackgroundColor(0);
BitmapDrawable bg = (BitmapDrawable)getResources().getDrawable(getSelectedItem());
bg.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT);
wvContent.setBackgroundDrawable(bg);

You can update background from SDCard as follows...

    String pathName = Environment.getExternalStorageDirectory().getPath() + "/folder/" + "image.jpg";
    Resources res = getResources(pathName);
    Bitmap bitmap = BitmapFactory.decodeFile(pathName);
    BitmapDrawable backgroundDrawable = new BitmapDrawable(res, bitmap);
    wvContent.setBackgroundDrawable(backgroundDrawable);