make BitmapDrawable functional

src/api-impl/android/graphics/drawable/Drawable.java

@@ -1,5 +1,33 @@
 package android.graphics.drawable;
 
-public class Drawable {
+import android.graphics.Canvas;
+import android.graphics.Rect;
 
+public abstract class Drawable {
+
+	private Rect mBounds = new Rect();
+
+	public int getChangingConfigurations() {
+		return 0;
+	}
+
+	public void setChangingConfigurations(int bitmap) {}
+
+	public ConstantState getConstantState() {
+		return new ConstantState();
+	}
+	
+	public class ConstantState {
+		
+	}
+
+	public void setBounds(int left, int top, int right, int bottom) {
+		mBounds.set(left, top, right, bottom);
+	}
+
+	public final Rect getBounds() {
+		return mBounds;
+	}
+
+	public abstract void draw(Canvas canvas);
 }