MusicGridItem problem

////////////////////////
/// values > attrs.xml
////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="MusicGridItem">

        <attr name="image_source" format="reference" />
        <attr name="text" format="string" />
        <attr name="text_color" format="color" />
        <attr name="bar_color" format="color" />
        <attr name="icon_source" format="reference" />
        <attr name="checkbox_color" format="string" />
        <attr name="checkbox_gravity" format="enum">
           <enum name="left" value="0"/>
           <enum name="right" value="1"/>
        </attr>
        <attr name="extend_image" format="boolean" />

        <attr name="android:checkable" />
        <attr name="android:width" />
        <attr name="android:height" />

    </declare-styleable>

</resources>


////////////////////////////////////
/// src > ... > MusicGridItem.java
////////////////////////////////////

public class MusicGridItem extends View {

    int imageSource;
    String text;
    int textColor;
    int barColor;
    int iconSource;
    int checkboxColor;
    int checkboxGravity;
    boolean isImageExtended;

    boolean isSelectable;
    int width;
    int height;

    public MusicGridItem(Context context, AttributeSet attrs) {

        super(context, attrs);

        TypedArray attr = context.getTheme().obtainStyledAttributes(attrs, android.R.styleable.MusicGridItem, 0, 0);

        try {

            imageSource = attr.getResourceId(  R.resources.musicgriditem_image_source, 0);

        } finally {

            attr.recycle();

        }
    }

}


////////////////////////////////////////////
/// concept layout.xml example intentions
////////////////////////////////////////////

Note: it mimics Google Play Musics "music grid item" on mobile

<FrameLayout
        android:layout_width="200dp"
        android:layout_height="100dp" >

        <ImageView android:id="@+id/image"

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/black"
            android:src="@drawable/artistPhotoGeneric" >

        </ImageView>

        <CheckBox
            android:id="@+id/select"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:layout_gravity="right"
            android:layout_margin="10dp"
            android:background="@color/white">

        </CheckBox>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"

            android:orientation="horizontal"

            android:background="@color/black">

            <TextView
                android:id="@+id/description"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Artist_Name"
                android:textAppearance="?android:attr/textAppearanceMedium" >

            </TextView>

            <ImageView
                android:id="@+id/more"
                android:layout_width="24dp"
                android:layout_height="24dp"
                android:src="@drawable/ic_launcher" >

            </ImageView>

        </LinearLayout>

  </FrameLayout>