Android开发之制作圆形头像自定义View,直接引用工具类,加快开发速度。带有源代码学习

Wesley13
• 阅读 568

作者:程序员小冰,CSDN博客:http://blog.csdn.net/qq_21376985
QQ986945193 博客园主页:http://www.cnblogs.com/mcxiaobing/

Android开发之制作圆形头像自定义View,直接引用工具类,加快开发速度。带有源代码学习

大家都知道。现在好多头像都是圆形的,不再是以前的正方形或者长方形。
因此今天给大家带来的就是如何制作一个圆形头像。下面是效果图:
Android开发之制作圆形头像自定义View,直接引用工具类,加快开发速度。带有源代码学习
当然利用一个自定义View集成ImageView即可。

package com.qq986945193.zoomimageviewrounddemo;

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.widget.ImageView;

/** * 微博:http://weibo.com/mcxiaobing * ============================================================================ * Copyright (c) 2015-2016 QQ986945193 All rights reserved. * ---------------------------------------------------------------------------- * 类名:自定义圆形头像View * ---------------------------------------------------------------------------- * 功能描述:http://blog.csdn.net/qq_21376985 * ---------------------------------------------------------------------------- */

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;// 图片的外边界
    private int mBorderInsideColor = 0;// 图片的内边界
    // 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.RoundImageView);
        // 边界的宽度
        mBorderThickness = a.getDimensionPixelSize(
                R.styleable.RoundImageView_border_thickness, 0);
        // 外边界的颜色
        mBorderOutsideColor = a.getColor(
                R.styleable.RoundImageView_border_outside_color, defaultColor);
        // 内边界的颜色
        mBorderInsideColor = a.getColor(
                R.styleable.RoundImageView_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(Config.ARGB_8888, true);
        if (defaultWidth == 0) {
            defaultWidth = getWidth();
        }
        if (defaultHeight == 0) {
            defaultHeight = getHeight();
        }
        // 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小(针对宽、高为wrap_content布局的imageview,但会导致margin无效)
        // if (defaultWidth != 0 && defaultHeight != 0) {
        // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
        // defaultWidth, defaultHeight);
        // setLayoutParams(params);
        // }

        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 * * http://blog.csdn.net/qq_21376985 * @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);
        // bitmap回收(recycle导致在布局文件XML看不到效果)
        // bmp.recycle();
        // squareBitmap.recycle();
        // scaledSrcBmp.recycle();
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }

    /** * 边缘画圆 * * http://blog.csdn.net/qq_21376985 */
    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);
    }

}

然后我们需要在布局中引用。下面是布局的一个引用,其实很简单,就和咱们
引用自定义View一模一样。由于它继承了ImageView。所以,方法大致相同。

 <com.qq986945193.zoomimageviewrounddemo.RoundImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"
        android:scaleType="fitCenter"
        android:src="@drawable/img" />

当然还有,我们写了一个样式,所以需要在styles样式中添加:

   <!-- 圆形ImageView -->
    <declare-styleable name="RoundImageView">
        <attr name="border_thickness" format="dimension" />
        <attr name="border_inside_color" format="color" />
        <attr name="border_outside_color" format="color" />
    </declare-styleable>

OK,这样,圆形的的效果就能出来了,是不是很简单呢?当然,自定义View那一块想了解的可以深入。毕竟,你只会用,看不懂源代码也是不太好吧?是不是呢?
(Eclipse版本)源代码传送门:
http://download.csdn.net/detail/qq_21376985/9599249
(Android Studio版本)源代码传送门:
https://github.com/QQ986945193/DavidZoomImageViewRoundDemo

点赞
收藏
评论区
推荐文章
Wesley13 Wesley13
2年前
javafx实现打砖块游戏
今天学习了一下JavaFX游戏部分参考博客:http://blog.csdn.net/ml3947(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fml3947)本人源码地址:http://git.oschina.net/flyfox/Game
Wesley13 Wesley13
2年前
java freemarker遍历树形菜单(导航栏菜单)
本人本人首发为csnd:http://blog.csdn.net/qq\_32196937/article/details/78793269(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fqq_32196937%2Farticle%2Fdetails%2
Wesley13 Wesley13
2年前
MQTT
源博客地址:http://blog.csdn.net/pipinet123(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fpipinet123)MQTT交流群:221405150面向群
Stella981 Stella981
2年前
Jetson TX1开发笔记(六):V4L2+OpenCV3.1以MJPG格式读取USB摄像头图像并实时显示
转载请注明作者和出处:http://blog.csdn.net/c406495762(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fc406495762)嵌入式平台(Target):JestonTX1OpenCV:
Wesley13 Wesley13
2年前
Java Mail
转载请注明出处:http://blog.csdn.net/qq\_26525215本文源自【大学之旅\_谙忆的博客(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fqq_26525215)】JavaMailAPI简介:
Stella981 Stella981
2年前
Android Hook框架adbi的分析(2)
本文博客地址:http://blog.csdn.net/qq1084283172/article/details/74452308(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fqq1084283172%2Farticle%2Fdetails%2F744
Stella981 Stella981
2年前
Spark Streaming(3):Windows设置checkpoint目录方法
引用:http://blog.csdn.net/u012684933/article/details/46124957(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fu012684933%2Farticle%2Fdetails%2F46124957)W
Stella981 Stella981
2年前
Linux下安装rabbitmq
原文地址,转载请注明出处: http://blog.csdn.net/qq\_34021712/article/details/72567786(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fqq_34021712%2Farticle%2Fdetails%
Stella981 Stella981
2年前
ContextLoaderListener容器初始化
http://blog.csdn.net/qq924862077/article/details/52769754(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fqq924862077%2Farticle%2Fdetails%2F52769754)
Stella981 Stella981
2年前
Android开发之道(1)搭建开发环境以HelloWorld例程
转载请注明本文来自:编程艺术家Poechant的CSDN博客http://blog.csdn.net/poechant(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fblog.csdn.net%2Fpoechant)本人平日以后端开发为主业,最近对移动的应用层开发有些兴趣,