add bunch of new java APIs: mostly stubs or copied from AOSP

Many of these classes are only needed to be subclassed by androidx
support library, which is used in many android apps

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

@@ -0,0 +1,5 @@
+package android.graphics.drawable;
+
+public interface Animatable {
+	
+}

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

@@ -0,0 +1,13 @@
+package android.graphics.drawable;
+
+import android.graphics.Canvas;
+
+public class ColorDrawable extends Drawable {
+
+	@Override
+	public void draw(Canvas canvas) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'draw'");
+	}
+	
+}

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

@@ -1,11 +1,15 @@
 package android.graphics.drawable;
 
+import android.content.res.Resources;
 import android.graphics.Canvas;
+import android.graphics.PorterDuff;
 import android.graphics.Rect;
 
 public abstract class Drawable {
+	public static interface Callback {}
 
 	private Rect mBounds = new Rect();
+	private int[] mStateSet = new int[0];
 
 	public int getChangingConfigurations() {
 		return 0;
@@ -14,11 +18,12 @@ public abstract class Drawable {
 	public void setChangingConfigurations(int bitmap) {}
 
 	public ConstantState getConstantState() {
-		return new ConstantState();
+		return null;
 	}
 	
-	public class ConstantState {
-		
+	public abstract class ConstantState {
+
+	public abstract Drawable newDrawable(Resources res);
 	}
 
 	public void setBounds(int left, int top, int right, int bottom) {
@@ -30,4 +35,38 @@ public abstract class Drawable {
 	}
 
 	public abstract void draw(Canvas canvas);
+
+	public boolean setState(int[] stateSet) {
+		this.mStateSet = stateSet;
+		return false;
+	}
+
+	public int[] getState() {
+		return mStateSet;
+	}
+
+	public void invalidateSelf() {}
+
+	public void setCallback(Callback callback) {}
+
+	public boolean isVisible() {
+		return false;
+	}
+
+	public boolean setVisible (boolean visible, boolean restart) {
+		return false;
+	}
+
+	public void clearColorFilter() {}
+
+	public final int getLevel() {return 0;}
+	public final boolean setLevel(int level) {return false;}
+
+	public void setBounds(Rect bounds) {}
+
+	public void setColorFilter(int color, PorterDuff.Mode mode) {}
+
+	public Drawable mutate() {
+		return this;
+	}
 }

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

@@ -0,0 +1,17 @@
+package android.graphics.drawable;
+
+import android.graphics.Canvas;
+
+public class GradientDrawable extends Drawable {
+
+	@Override
+	public void draw(Canvas canvas) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'draw'");
+	}
+
+	public void setColor(int color) {}
+
+	public void setCornerRadius(float cornerRadius) {}
+	
+}

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

@@ -0,0 +1,14 @@
+package android.graphics.drawable;
+
+import android.graphics.Canvas;
+
+public class LayerDrawable extends Drawable {
+
+	public LayerDrawable(Drawable[] drawables) {
+	}
+
+	@Override
+	public void draw(Canvas canvas) {
+	}
+	
+}