android layerlist bitmap android – 在LayerListDrawable中更改Bitmap Drawable

这是我的LayerList的简化版本.它在项目中有一个位图以防止缩放.我想以编程方式更改此位图的drawable.有没有办法做到这一点？

android:id="@+id/item"

android:left="165dp"

android:top="245dp" >

android:id="@+id/bitmap"

android:src="@drawable/tag_de_01"

android:gravity="top|left" />

我尝试了以下但没有成功：

Resources res = getResources();

LayerDrawable layerDrawable = (LayerDrawable) res.getDrawable(R.drawable.layer_list_drawable);

Drawable newDrawable = (Drawable)res.getDrawable(R.drawable.something);

// works, but scales the image because the drawable of the item is set instead the one of the bitmap

layerDrawable.setDrawableByLayerId(R.id.item, newDrawable);

// doesn't work at all

layerDrawable.setDrawableByLayerId(R.id.bitmap, newDrawable);

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