Question

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？

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item 
        android:id="@+id/item" 
        android:left="165dp" 
        android:top="245dp" >
        <bitmap
            android:id="@+id/bitmap" 
            android:src="@drawable/tag_de_01"
            android:gravity="top|left" />
    </item>

</layer-list>

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);

Answer 1

将newDrawable转换为BitmapDrawable（当然，假设它是一个），你可以像使用xml中的android：gravity属性一样使用BitmapDrawable.setGravity来防止缩放

在LayerListDrawable中更改Bitmap Drawable

1 个答案: