I am writing a program which deals with playing cards. Here, I am trying to show the player's hand. I have six imageButtons sixCard0 -- sixCard5 which will each display one card from the player's hand. Each has its default image (of a question-mark card) set in xml:
<ImageButton
android:id="@+id/sixCard0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="0dp"
android:src="@drawable/card0" />
I want to change this image to an image representing the card that is already in the player's hand when the activity starts. The cards are kept in CribbageApplication.cardList. In the activity's onCreate(...) I have:
findViewById(R.id.sixCard0).setBackgroundResource(getResources().getIdentifier(Card.getImageName(((CribbageApplication) this.getApplication()).getCardList()[0]), "drawable", getPackageName()));
findViewById(R.id.sixCard0).invalidate();
Accessing these values is not where I am having a problem. My problem is that when I run the app, the default image is still displayed on the imageButtons. See: http://s23.postimg.org/cbmxchonv/Screenshot_2014_05_28_22_15_25_1.png
In debugging, I decided to use a smaller image as the imageButton's default image. (In this case it is an icon with text that reads "Set Hand" which I sourced from elsewhere in my program.) Now when I run the app you can clearly see the default "Set Hand" icon there with the new larger card image behind it! See: http://s12.postimg.org/3ytgenaz1/Screenshot_2014_05_28_21_48_10_1.png
Can someone please tell why this is happening?
EDIT: I have fixed the problem. I should be using setImageResource(...) instead of setBackgroundResource(...). In the example above, a typecast is required to call this function:
((ImageButton) findViewById(R.id.sixCard0)).setBackgroundResource(getResources().getIdentifier(Card.getImageName(((CribbageApplication) this.getApplication()).getCardList()[0]), "drawable", getPackageName()));