Allows for an ImageView to be reset back to the original src attribute.

DefaultImageView.java

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by granta on 2/21/14.
 */
public class DefaultImageView extends ImageView {

    private int mCachedResourceId = 0;

    public DefaultImageView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mCachedResourceId = attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android", "src", mCachedResourceId);
    }

    public DefaultImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mCachedResourceId = attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android", "src", mCachedResourceId);
    }

    public int getDefaultResourceId() {
        return mCachedResourceId;
    }

    public void resetToDefault() {
        setImageResource(mCachedResourceId);
    }
}