Android圆形图片--自定义控件

转自：http://blog.csdn.net/android_dong/article/details/41989499

Android圆形图片控件效果图如下：



代码如下:

RoundImageView.java

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package com.dxd.roundimageview;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.PorterDuff.Mode;

import android.graphics.PorterDuffXfermode;

import android.graphics.Rect;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.NinePatchDrawable;

import android.util.AttributeSet;

import android.util.Log;

import android.widget.ImageView;

import com.alan.myimageview.R;

/**

* 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。

* 设置颜色在xml布局文件中由自定义属性配置参数指定

*/

public class RoundImageView extends ImageView {

private int mBorderThickness = 0;

private Context mContext;

private int defaultColor = 0xFFFFFFFF;

// 如果只有其中一个有值，则只画一个圆形边框

private int mBorderOutsideColor = 0;

private int mBorderInsideColor = 0;

// 控件默认长、宽

private int defaultWidth = 0;

private int defaultHeight = 0;

public RoundImageView(Context context) {

super(context);

mContext = context;

}

public RoundImageView(Context context, AttributeSet attrs) {

super(context, attrs);

mContext = context;

setCustomAttributes(attrs);

}

public RoundImageView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

mContext = context;

setCustomAttributes(attrs);

}

private void setCustomAttributes(AttributeSet attrs) {

TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.roundedimageview);

mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);

mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color,defaultColor);

mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);

}

@Override

protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable() ;

if (drawable == null) {

return;

}

if (getWidth() == 0 || getHeight() == 0) {

return;

}

this.measure(0, 0);

if (drawable.getClass() == NinePatchDrawable.class)

return;

Bitmap b = ((BitmapDrawable) drawable).getBitmap();

Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

if (defaultWidth == 0) {

defaultWidth = getWidth();

}

if (defaultHeight == 0) {

defaultHeight = getHeight();

}

int radius = 0;

if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;

// 画内圆

drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);

// 画外圆

drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);

} else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);

} else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);

} else {// 没有边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;

}

Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);

canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);

}

/**

* 获取裁剪后的圆形图片

* @param radius半径

*/

public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {

Bitmap scaledSrcBmp;

int diameter = radius * 2;

// 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片

int bmpWidth = bmp.getWidth();

int bmpHeight = bmp.getHeight();

int squareWidth = 0, squareHeight = 0;

int x = 0, y = 0;

Bitmap squareBitmap;

if (bmpHeight > bmpWidth) {// 高大于宽

squareWidth = squareHeight = bmpWidth;

x = 0;

y = (bmpHeight - bmpWidth) / 2;

// 截取正方形图片

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);

} else if (bmpHeight < bmpWidth) {// 宽大于高

squareWidth = squareHeight = bmpHeight;

x = (bmpWidth - bmpHeight) / 2;

y = 0;

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);

} else {

squareBitmap = bmp;

}

if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {

scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,diameter, true);

} else {

scaledSrcBmp = squareBitmap;

}

Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),

scaledSrcBmp.getHeight(),

Config.ARGB_8888);

Canvas canvas = new Canvas(output);

Paint paint = new Paint();

Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),scaledSrcBmp.getHeight());

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

canvas.drawARGB(0, 0, 0, 0);

canvas.drawCircle(scaledSrcBmp.getWidth() / 2,

scaledSrcBmp.getHeight() / 2,

scaledSrcBmp.getWidth() / 2,

paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);

bmp = null;

squareBitmap = null;

scaledSrcBmp = null;

return output;

}

/**

* 边缘画圆

*/

private void drawCircleBorder(Canvas canvas, int radius, int color) {

Paint paint = new Paint();

/* 去锯齿 */

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

paint.setColor(color);

/* 设置paint的　style　为STROKE：空心 */

paint.setStyle(Paint.Style.STROKE);

/* 设置paint的外框宽度 */

paint.setStrokeWidth(mBorderThickness);

canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);

}

}

1、定义自己的属性配置文件：attr.xml

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<?xml version="1.0" encoding="utf-8"?>

<resources>

<declare-styleable name="roundedimageview">

<attr name="border_thickness" format="dimension" />

<attr name="border_inside_color" format="color" />

<attr name="border_outside_color" format="color"></attr>

</declare-styleable>

</resources>

2、在xml配置中使用控件：activity_main.xml

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal"

>

<!-- 没有指定圆形ImageView属性时，默认没有外边圆颜色 -->

<!-- 需要将图片资源自定为src ，或在程序中setImageResource(res) 不能设置background为图片，这样不能达到圆形效果-->

<com.dxd.roundimageview.RoundImageView

android:layout_width="100dp"

android:layout_height="100dp"

android:src="@drawable/img"

/>

<!-- border_outside_color 外部圆圈的颜色 -->

<!-- border_inside_color 内部部圆圈的颜色 -->

<!-- border_thickness 外圆和内圆的宽度 -->

<com.dxd.roundimageview.RoundImageView

android:layout_width="100dp"

android:layout_height="100dp"

android:src="@drawable/img"

imagecontrol:border_inside_color="#bc0978"

imagecontrol:border_outside_color="#ba3456"

imagecontrol:border_thickness="1dp"

/>

</LinearLayout>

3、主Activity中没有相关代码，直接加载布局文件即可。