Change activity background dynamically

Question

I am developing a weather app where I wish to change my activity background as the weather changes like night to day or day to night.I seemed unable to find answers. A little help would be deeply appreciated.

possible duplicate http://stackoverflow.com/questions/2748830/how-to-change-background-color-in-android-app — manolodewiner, Mar 31 '16 at 17:31
make a custom `Drawable` class and use it in any View by callimg `View#setBackground` — pskink, Mar 31 '16 at 17:44
psink,sorry to bother you again,I am new here and could you give me a link for guide? — hemen, Mar 31 '16 at 17:55

score 1 · Accepted Answer · answered Mar 31 '16 at 17:56

1

Try this:

final int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
layout.setBackgroundDrawable( getResources().getDrawable(R.drawable.yourimg));
} else {
layout.setBackground(R.drawable.yourimg);
}

answered Mar 31 '16 at 17:56

ashxvi

144
1
10

Did you test `layout.setBackground(R.drawable.yourimg);`? setBackground expect **Drawable**, not **int** parameter – Gueorgui Obregon Mar 31 '16 at 18:55
It did work,but I made a bit my own modification.Cheers – hemen Apr 01 '16 at 04:41
Please if you find our help valuable, mark the question as solved ;) – Gueorgui Obregon Apr 01 '16 at 04:52
Happy to help you. For getDrawable(int), it's deprecated. – ashxvi Apr 01 '16 at 12:43
Hi @Cyborg91 Can you mark my answer as accepted? Cheers – ashxvi Apr 09 '17 at 12:04

Gueorgui Obregon · Answer 2 · 2016-03-31T19:53:38.110

Add this in your Activity onCreate():

protected void onCreate(Bundle savedInstanceState) {

    //...
    Calendar cal = Calendar.getInstance();
    int hour = cal.get(Calendar.HOUR_OF_DAY);
    boolean isNight = hour < 6 || hour > 18;

    int currentDrawable = isNight ? R.drawable.night : R.drawable.day;
    View decorView = getWindow().getDecorView();
    Drawable drawable = ContextCompat.getDrawable(this, currentDrawable);
    if(Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
        decorView.setBackgroundDrawable(drawable);
    else
        decorView.setBackground(drawable);
}

Hope this helps!!

Change activity background dynamically

2 Answers2