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 on

the 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 {

@Override

protected 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：