javaandroidbackgrounddrawable

How set background drawable programmatically in Android

To set Background:

RelativeLayout layout = (RelativeLayout) findViewById(R.id.background);
layout.setBackgroundResource(R.drawable.ready);

Is the best way to do it?

Solution

  • layout.setBackgroundResource(R.drawable.ready); is correct.
    Another way to achieve it is to use the following:

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

    But I think the problem occur because you are trying to load big images.
    Here is a good tutorial how to load large bitmaps.

    UPDATE:
    getDrawable(int ) deprecated in API level 22

    getDrawable(int ) is now deprecated in API level 22. You should use the following code from the support library instead:

    ContextCompat.getDrawable(context, R.drawable.ready)

    If you refer to the source code of ContextCompat.getDrawable, it gives you something like this:

    /**
 * Return a drawable object associated with a particular resource ID.
 * <p>
 * Starting in {@link android.os.Build.VERSION_CODES#LOLLIPOP}, the returned
 * drawable will be styled for the specified Context's theme.
 *
 * @param id The desired resource identifier, as generated by the aapt tool.
 *            This integer encodes the package, type, and resource entry.
 *            The value 0 is an invalid identifier.
 * @return Drawable An object that can be used to draw this resource.
 */
public static final Drawable getDrawable(Context context, int id) {
    final int version = Build.VERSION.SDK_INT;
    if (version >= 21) {
        return ContextCompatApi21.getDrawable(context, id);
    } else {
        return context.getResources().getDrawable(id);
    }
}

    More details on ContextCompat

    As of API 22, you should use the getDrawable(int, Theme) method instead of getDrawable(int).

    UPDATE:
    If you are using the support v4 library, the following will be enough for all versions.

    ContextCompat.getDrawable(context, R.drawable.ready)

    You will need to add the following in your app build.gradle

    compile 'com.android.support:support-v4:23.0.0' # or any version above

    Or using ResourceCompat, in any API like below: 

    import android.support.v4.content.res.ResourcesCompat;
ResourcesCompat.getDrawable(getResources(), R.drawable.name_of_drawable, null);