将边框/描边设置为矢量绘制可编程

Question

我可以通过编程方式更改矢量绘制的颜色，但我想将描边应用于矢量绘制。我需要在运行时改变矢量绘制中风的方法：

以前我用这个方法，但在我的情况下失败。

我将Vector drawable转换为位图，然后将边框与此函数一起使用，但它用黑色填充所有，则不应用笔触。

private static Bitmap getBitmap(VectorDrawable vectorDrawable) 
    { 
     Bitmap bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(), 
     vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); 
     Canvas canvas = new Canvas(bitmap); 
     vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); 
     vectorDrawable.draw(canvas); 
     return bitmap; 
    } 
    private static Bitmap getBitmap(Context context, int drawableId) 
    { 

     Drawable drawable = ContextCompat.getDrawable(context, drawableId); 
     if (drawable instanceof BitmapDrawable) 
     { 
      return ((BitmapDrawable) drawable).getBitmap(); 
     } 
     else if (drawable instanceof VectorDrawable) 
     { 
      return getBitmap((VectorDrawable) drawable); 
     } 
     else 
     { 
      throw new IllegalArgumentException("unsupported drawable type"); 
     } 
    } 
private Bitmap addWhiteBorder(Bitmap bmp, int borderSize) 
    { 
     Bitmap bmpWithBorder = Bitmap.createBitmap(bmp.getWidth() + borderSize*2 , bmp.getHeight() + borderSize*2 , bmp.getConfig()); 
     Canvas canvas = new Canvas(bmpWithBorder); 
     canvas.drawColor(Color.BLACK); 
     canvas.drawBitmap(bmp, borderSize, borderSize, null); 
     return bmpWithBorder; 
    } 

Answer 1

假设您在VectorDrawable在vectordrawable.xml定义

<vector 
    android:width="100dp" 
    android:height="100dp" 
    android:viewportWidth="100" 
    android:viewportHeight="100"> 
    <path 
     android:name="headset" 
     android:strokeColor="#FF000000" 
     android:strokeWidth="0" 
     ... 
     android:pathData="..." /> 
</vector> 

然后你就可以定义一个AnimatedVectorDrawable改变strokeWidth

<?xml version="1.0" encoding="utf-8"?> 
<animated-vector 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:drawable="@drawable/vectordrawable"> 
    <target 
     android:animation="@animator/change_stroke_width" 
     android:name="headset" /> 

</animated-vector> 

最后，定义改变strokeWidth动画in change_stroke_width.xml：

<set xmlns:android="http://schemas.android.com/apk/res/android" > 
    <objectAnimator 
     android:duration="100" 
     android:propertyName="strokeWidth" 
     android:valueFrom="0" 
     android:valueTo="10" /> 
</set>