Android圆形头像控件

1、自定义控件方式

自定义类：

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
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;
 
import com.iruiyou.pet.R;
 
/**
 *
 * @author sgf
 * 自定义圆形头像
 *
 */
public class RoundImageView extends ImageView {
    private int mBorderThickness = 0;
    private Context mContext;
    private int defaultColor = 0xFFFFFFFF;
    // 外圆边框颜色
    private int mBorderOutsideColor = 0;
    // 内圆边框颜色
    private int mBorderInsideColor = 0;
    // RoundImageView控件默认的长、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;
        // 设置RoundImageView的属性值，比如颜色，宽度等
        setRoundImageViewAttributes(attrs);
    }
 
    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
        setRoundImageViewAttributes(attrs);
    }
 
    // 从attr.xml文件中获取属性值，并给RoundImageView设置
    private void setRoundImageViewAttributes(AttributeSet attrs) {
        TypedArray a = mContext.obtainStyledAttributes(attrs,
                R.styleable.round_image_view);
        mBorderThickness = a.getDimensionPixelSize(
                R.styleable.round_image_view_border_width, 0);
        mBorderOutsideColor = a.getColor(
                R.styleable.round_image_view_border_outcolor, defaultColor);
        mBorderInsideColor = a.getColor(
                R.styleable.round_image_view_border_incolor, defaultColor);
        a.recycle();
    }
 
    // 具体解释：比如我自定义一个控件，怎么实现呢，以RoundImageView为例，首先是继承ImageView,然后实现其构造函数，在构造函数中，获取attr中的属性值（再次解释：这里获取的具体的这个属性的值是怎么来的呢？比如颜色和宽度，这个在attr.xml中定义了相关的名字，而在使用RoundImageView的xml布局文件中，我们会设置其值，这里需要用的值，就是从那里设置的），并设置在本控件中，然后继承onDraw方法，画出自己想要的图形或者形状即可
    /**
     * 这个是继承的父类的onDraw方法
     *
     * onDraw和下面的方法不用管，基本和学习自定义没关系，就是实现怎么画圆的，你可以改变下面代码试着画三角形头像，哈哈
     */
    @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;
        // 这里的判断是如果内圆和外圆设置的颜色值不为空且不是默认颜色，就定义画两个圆框，分别为内圆和外圆边框
        if (mBorderInsideColor != defaultColor
                && mBorderOutsideColor != defaultColor) {
            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) {// 这里的是如果内圆边框不为空且颜色值不是默认值，就画一个内圆的边框
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2,
                    mBorderInsideColor);
        } else if (mBorderInsideColor == defaultColor
                && mBorderOutsideColor != defaultColor) {// 这里的是如果外圆边框不为空且颜色值不是默认值，就画一个外圆的边框
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2,
                    mBorderOutsideColor);
        } else {// 这种情况是没有设置属性颜色的情况下，即没有边框的情况
            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 bmp
     * @param radius
     *            半径
     * @return
     */
    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(), Bitmap.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(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }
 
    /**
     * 画边缘的圆，即内圆或者外圆
     */
    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);
    }
}

属性文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <declare-styleable name="round_image_view">
        <attr name="border_width" format="dimension" />
        <attr name="border_incolor" format="color" />
        <attr name="border_outcolor" format="color"></attr>
    </declare-styleable>
 
</resources>

用法：

<com.iruiyou.pet.utils.RoundImageView
      android:id="@+id/headIv"
      android:layout_width="125dp"
      android:layout_height="125dp"
      android:layout_marginTop="92dp"
      android:src="@drawable/head_home"
      loonggg:border_incolor="#000fff"
      loonggg:border_outcolor="#fff000"
      loonggg:border_width="10dp"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toTopOf="parent"/>

2、使用开源库

见下方网页

参考：https://blog.csdn.net/shenggaofei/article/details/83793536