layer-list 加载多个图层

整理旧笔记

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1、xml 资源实现

/drawable/layer.xml
                 
    
    
    

/// 使用图层资源
ImageView.setImageDrawable(getResources().getDrawable(R.drawable.layer));```

2.代码实现
```Java
Resources res = getResources();
/// 构建 Drawable 数组
Drawable[] layers = new Drawable[3];
layers[0] = res.getDrawable(R.drawable.icon0);
layers[1] = res.getDrawable(R.drawable.icon1);
layers[2] = res.getDrawable(R.drawable.icon2);
/// 将 Drawable 数组转为 LayerDrawable 图层资源
LayerDrawable layerDrawable = new LayerDrawable(layers);
/// 使用图层资源
ImageView.setImageDrawable(layerDrawable);