圆角矩形“RoundRectShape”使用详解

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圆角矩形常用作一些组件的背景

构造函数：

RoundRectShape(float[] outerRadii, RectF inset, float[] innerRadii)

Specifies an outer (round)rect and an optional inner (round)rect.// 指定一个外部（圆角）矩形和一个可选的内部（圆角）矩形。

Parameters:

outerRadii

An array of 8 radius values, for the outer roundrect. The first two floats are for the top-left corner (remaining pairs correspond clockwise). For no rounded corners on the outer rectangle, pass null.

//一个包含8个弧度值，指定外部圆角矩形的 4个角部的弧度及：new float[] {l, l, t, t, r, r, b, b};

// 前2个左上角， 3 4 ，右上角， 56，右下， 78 ，左下，如果没弧度的话，传入null即可。

inset

A RectF that specifies the distance from the inner rect to each side of the outer rect. For no inner, pass null.

//指定外部矩形4条边与内部矩形的4条边的个距离，也用RectF的方式指定。

innerRadii

An array of 8 radius values, for the inner roundrect. The first two floats are for the top-left corner (remaining pairs correspond clockwise). For no rounded corners onthe inner rectangle, pass null. If inset parameter is null, this parameter is ignored.

//同第一个参数。

例子如下：

package com.example.testroundrectshape;import android.app.Activity;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.RoundRectShape;import android.os.Bundle;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);TextView test = (TextView) findViewById(R.id.test);// 外部矩形弧度float[] outerR = new float[] { 8, 8, 8, 8, 8, 8, 8, 8 };// 内部矩形与外部矩形的距离RectF inset = new RectF(100, 100, 50, 50);// 内部矩形弧度float[] innerRadii = new float[] { 20, 20, 20, 20, 20, 20, 20, 20 };RoundRectShape rr = new RoundRectShape(outerR, inset, null);ShapeDrawable drawable = new ShapeDrawable(rr);//指定填充颜色drawable.getPaint().setColor(Color.YELLOW);// 指定填充模式drawable.getPaint().setStyle(Paint.Style.FILL);test.setBackgroundDrawable(drawable);}}

效果图：

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