Android ShapeDrawable程序化设置背景和边框

Question

我有一个ShapeDrawable：

final ShapeDrawable drawable = new ShapeDrawable(shape);
drawable.getPaint().setStyle(Paint.Style.FILL);
drawable.getPaint().setColor(0xFFffffff);

我希望为这个可绘制对象设置边框颜色和宽度。我尝试使用 setStyle(Paint.Style.FILL_AND_STROKE)，但它会将背景和边框设置为相同的颜色。

- Hossain Khademian

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你找到了一种方法来做那件事吗？ - Alvaro Rivoir

Answer 1

如果你有一个视图，如TextView，需要设置背景和边框，你可以使用以下Kotlin代码实现：

val view = findViewById(R.id.miTextView) as TextView
val borderColor : Int = Color.GRAY,
val backgroundColor : Int = Color.GRAY,
val borderWidth : Float = 5F,
val borderRadius : Float = 15F
val borderShape = ShapeDrawable().apply {
    shape = RoundRectShape(floatArrayOf(borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius), null, null)
    paint.color = borderColor
    paint.style = Paint.Style.STROKE;
    paint.strokeWidth = borderWidth;
}
val backgroundShape = ShapeDrawable().apply {
    shape = RoundRectShape(floatArrayOf(borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius, borderRadius), null, null)
    paint.color = backgroundColor
    paint.style = Paint.Style.FILL_AND_STROKE;
}
val composite = LayerDrawable(arrayOf<Drawable>(backgroundShape, borderShape))
view.background = composite

- Tlacaelel Ramon Luis

Answer 2

使用

drawable.getPaint().setStyle(Paint.Style.STROKE);
drawable.getPaint().setStrokeWidth(2); // in pixel

- Richard Chang

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那么缺失的边框颜色呢？这个回答不应该被点赞，因为它没有回答主要问题。 - d.aemon