简单的Drawable装饰器不起作用

Question

我在image为ImageView：

的活动中执行此操作

Drawable d = getResources().getDrawable(R.drawable.somejpeg);

//only one of the lines below               
image.setImageDrawable(d); //works
image.setImageDrawable(new DrawableDecorator(d)); //does not work - blank image

这是我的可绘装饰者：

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.drawable.Drawable;

public final class DrawableDecorator extends Drawable {

    private final Drawable drawable;

    public DrawableDecorator(Drawable drawable) {
        this.drawable = drawable;
    }

    @Override
    public void draw(Canvas canvas) {
        drawable.draw(canvas);
    }

    @Override
    public void setAlpha(int alpha) {
        drawable.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        drawable.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return drawable.getOpacity();
    }

}

我已经覆盖了我所拥有的东西，只是传递给装饰物品，但我错过了什么导致它失败？

请注意，调用draw方法。

Answer 1

我应该通过一些更重要的覆盖。

@Override
public boolean setVisible(boolean visible, boolean restart) {
    return drawable.setVisible(visible, restart);
}

@Override
public void setBounds(int left, int top, int right, int bottom) {
    drawable.setBounds(left, top, right, bottom);
}

@Override
public void setBounds(Rect bounds) {
    drawable.setBounds(bounds);
}

@Override
public int getIntrinsicHeight() {
    return drawable.getIntrinsicHeight();
}

@Override
public int getIntrinsicWidth() {
    return drawable.getIntrinsicWidth();
}