Question

我想在运行时将所有边的边框添加到RelativeLayout。我能够获得边框，但它正在改变布局的背景颜色。如果我将背景颜色设置为white，它也会将边框颜色更改为白色。我该如何避免？

以下是我的代码：

private static void drawBorder(Context context, View layout){

    final RectShape rect = new RectShape();
    final ShapeDrawable rectShapeDrawable = new ShapeDrawable(rect);

    final Resources res = context.getResources();

    final Paint paint = rectShapeDrawable.getPaint();
    paint.setFlags(Paint.ANTI_ALIAS_FLAG);
    paint.setColor(Color.BLUE);
    paint.setStyle(Style.STROKE);
    paint.setStrokeWidth(10);

    layout.setBackgroundDrawable(rectShapeDrawable); //Testing on phone with API < 16

}

感谢。

Answer 1

只需创建一个带有以下边框描述的xml文件

<shape xmlns:android="http://schemas.android.com/apk/res/android"
   android:shape="rectangle">
<corners
  android:radius="2dp"
  android:topRightRadius="0dp"
  android:bottomRightRadius="0dp"
  android:bottomLeftRadius="0dp" />
<stroke
  android:width="1dp"
  android:color="@android:color/white" />
</shape>

并使用此drawable

为视图设置backgroundresource

Answer 2

您可以使用：

private static Bitmap drawBitmapWithBorders(int width, int height, int borderWidth,
                                     int backgroundColor, int borderColor){
    int pixels[] = new int[width*height];
    Arrays.fill(pixels, borderColor);
    for(int i=borderWidth;i<height-borderWidth;i++){
        Arrays.fill(pixels, i*width+borderWidth, (i+1)*width-borderWidth, backgroundColor);
    }
    return Bitmap.createBitmap(pixels, width, height, Bitmap.Config.ARGB_8888);
}

在Android中运行时向相对布局添加边框

2 个答案: