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:

[java] view plain copy 在CODE上查看代码片派生到我的代码片
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:
这里写图片描述

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