在Android开发中我们常常用到圆形的头像，如果每次加载之后再进行圆形裁剪特别麻烦。所以在这里写一个自定义圆形ImageView，直接去加载网络图片，这样的话就特别的方便。

先上效果图

主要的方法

1.让自定义 CircleImageView 继承ImageView

/*** 自定义圆形头像* Created by Dylan on 2015/11/26 0026.*/public class CircleImageView extends ImageView {}

2.在构造方法中获取在xml中设置的值

public CircleImageView(Context context) {super(context);}public CircleImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);super.setScaleType(SCALE_TYPE);/*** 获取在xml中声明的属性*/TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);//获取xml中的属性mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);a.recycle();mReady = true;if (mSetupPending) {setup();mSetupPending = false;}}

3.初始化各种参数设置

/*** 画圆形图的初始化工作*/private void setup() {if (!mReady) {mSetupPending = true;return;}if (mBitmap == null) {return;}/***调用这个方法来产生一个画有一个位图的渲染器（Shader）。bitmap 在渲染器内使用的位图tileX The tiling mode for x to draw the bitmap in. 在位图上X方向花砖模式tileY The tiling mode for y to draw the bitmap in. 在位图上Y方向花砖模式TileMode：（一共有三种）CLAMP ：如果渲染器超出原始边界范围，会复制范围内边缘染色。REPEAT ：横向和纵向的重复渲染器图片，平铺。MIRROR ：横向和纵向的重复渲染器图片，这个和REPEAT 重复方式不一样，他是以镜像方式平铺。*/mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);/*** 设置画圆形的画笔*/mBitmapPaint.setAntiAlias(true);//设置抗锯齿mBitmapPaint.setShader(mBitmapShader);//绘制图形时的图形变换mBorderPaint.setStyle(Paint.Style.STROKE);mBorderPaint.setAntiAlias(true);mBorderPaint.setColor(mBorderColor);mBorderPaint.setStrokeWidth(mBorderWidth);mBitmapHeight = mBitmap.getHeight();mBitmapWidth = mBitmap.getWidth();/*** 设置边框矩形的坐标*/mBorderRect.set(0, 0, getWidth(), getHeight());/*** 设置边框圆形的半径为图片的宽度和高度的一半的最大值*/mBorderRadius = Math.max((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);/*** 设置图片矩形的坐标*/mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);/*** 设置图片圆形的半径为图片的宽度和高度的一半的最大值*/mDrawableRadius = Math.max(mDrawableRect.height() / 2, mDrawableRect.width() / 2);updateShaderMatrix();/*** 调用onDraw()方法进行绘画*/invalidate();}/*** 更新位图渲染*/private void updateShaderMatrix() {float scale;float dx = 0;float dy = 0;/*** 重置*/mShaderMatrix.set(null);/***计算缩放比，因为如果图片的尺寸超过屏幕，那么就会自动匹配到屏幕的尺寸去显示。* 确定移动的xy坐标**/if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {scale = mDrawableRect.width() / (float) mBitmapWidth;dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;} else {scale = mDrawableRect.height() / (float) mBitmapHeight;dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;}mShaderMatrix.setScale(scale, scale);mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);/*** 设置shader的本地矩阵*/mBitmapShader.setLocalMatrix(mShaderMatrix);}

4.画圆

@Overrideprotected void onDraw(Canvas canvas) {if (getDrawable() == null) {return;}/*** 画圆形图片*/canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);/*** 画圆形边框*/canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);}

完整代码,有完整的注释

1.CircleImageView 主类

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.Shader;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.ColorDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;import com.kejiang.yuandl.R;import com.kejiang.yuandl.utils.ImageSizeUtil;/*** 自定义圆形头像* Created by Dylan on 2015/11/26 0026.*/public class CircleImageView extends ImageView {/*** 圆形头像默认，CENTER_CROP!=系统默认的CENTER_CROP；* 将图片等比例缩放，让图像的长边边与ImageView的边长度相同，短边不够的留空白，缩放后截取圆形部分进行显示。*/private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;/*** 图片的压缩质量* ALPHA_8就是Alpha由8位组成，------ALPHA_8 代表8位Alpha位图* ARGB_4444就是由4个4位组成即16位，------ARGB_4444 代表16位ARGB位图* ARGB_8888就是由4个8位组成即32位，------ARGB_8888 代表32位ARGB位图* RGB_565就是R为5位，G为6位，B为5位共16位，------ARGB_565 代表8位RGB位图*/private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;/*** 默认ColorDrawable的宽和高*/private static final int COLORDRAWABLE_DIMENSION = 1;/*** 默认边框宽度*/private static final int DEFAULT_BORDER_WIDTH = 0;/*** 默认边框颜色*/private static final int DEFAULT_BORDER_COLOR = Color.BLACK;/*** 画图片的矩形*/private final RectF mDrawableRect = new RectF();/*** 画边框的矩形*/private final RectF mBorderRect = new RectF();/*** 对图片进行缩放和移动的矩阵*/private final Matrix mShaderMatrix = new Matrix();/*** 画图片的画笔*/private final Paint mBitmapPaint = new Paint();/*** 画边框的画笔*/private final Paint mBorderPaint = new Paint();/*** 默认边框颜色*/private int mBorderColor = DEFAULT_BORDER_COLOR;/*** 默认边框宽度*/private int mBorderWidth = DEFAULT_BORDER_WIDTH;private Bitmap mBitmap;/*** 产生一个画有一个位图的渲染器（Shader）*/private BitmapShader mBitmapShader;/*** 图片的实际宽度*/private int mBitmapWidth;/*** 图片实际高度*/private int mBitmapHeight;/*** 图片半径*/private float mDrawableRadius;/*** 边框半径*/private float mBorderRadius;/*** 是否初始化准备好*/private boolean mReady;/*** 内边距*/private boolean mSetupPending;public CircleImageView(Context context) {super(context);}public CircleImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);super.setScaleType(SCALE_TYPE);/*** 获取在xml中声明的属性*/TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);//获取xml中的属性mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);a.recycle();mReady = true;if (mSetupPending) {setup();mSetupPending = false;}}@Overridepublic ScaleType getScaleType() {return SCALE_TYPE;}@Overrideprotected void onDraw(Canvas canvas) {if (getDrawable() == null) {return;}/*** 画圆形图片*/canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);/*** 画圆形边框*/canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);setup();}/*** 获取边框颜色** @return*/public int getBorderColor() {return mBorderColor;}/*** 设置边框颜色** @param borderColor*/public void setBorderColor(int borderColor) {if (borderColor == mBorderColor) {return;}mBorderColor = borderColor;mBorderPaint.setColor(mBorderColor);invalidate();}/*** 获取边框宽度** @return*/public int getBorderWidth() {return mBorderWidth;}/*** 设置边框宽度** @param borderWidth*/public void setBorderWidth(int borderWidth) {if (borderWidth == mBorderWidth) {return;}mBorderWidth = borderWidth;setup();}/*** 设置资源图片** @param bm*/@Overridepublic void setImageBitmap(Bitmap bm) {super.setImageBitmap(bm);mBitmap = bm;setup();}/*** 设置资源图片** @param drawable*/@Overridepublic void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable);mBitmap = getBitmapFromDrawable(drawable);setup();}/*** 设置资源id** @param resId*/@Overridepublic void setImageResource(int resId) {super.setImageResource(resId);mBitmap = getBitmapFromDrawable(getDrawable());setup();}/*** 获取资源图片** @param drawable* @return*/private Bitmap getBitmapFromDrawable(Drawable drawable) {if (drawable == null) {return null;}if (drawable instanceof BitmapDrawable) {return ((BitmapDrawable) drawable).getBitmap();}try {Bitmap bitmap;if (drawable instanceof ColorDrawable) {bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);} else {ImageSizeUtil.ImageSize imageSize = ImageSizeUtil.getImageViewSize(this);bitmap = Bitmap.createBitmap(imageSize.width,imageSize.height, BITMAP_CONFIG);}Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());drawable.draw(canvas);return bitmap;} catch (OutOfMemoryError e) {return null;}}/*** 画圆形图的方法*/private void setup() {if (!mReady) {mSetupPending = true;return;}if (mBitmap == null) {return;}/***调用这个方法来产生一个画有一个位图的渲染器（Shader）。bitmap 在渲染器内使用的位图tileX The tiling mode for x to draw the bitmap in. 在位图上X方向花砖模式tileY The tiling mode for y to draw the bitmap in. 在位图上Y方向花砖模式TileMode：（一共有三种）CLAMP ：如果渲染器超出原始边界范围，会复制范围内边缘染色。REPEAT ：横向和纵向的重复渲染器图片，平铺。MIRROR ：横向和纵向的重复渲染器图片，这个和REPEAT 重复方式不一样，他是以镜像方式平铺。*/mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);/*** 设置画圆形的画笔*/mBitmapPaint.setAntiAlias(true);//设置抗锯齿mBitmapPaint.setShader(mBitmapShader);//绘制图形时的图形变换mBorderPaint.setStyle(Paint.Style.STROKE);mBorderPaint.setAntiAlias(true);mBorderPaint.setColor(mBorderColor);mBorderPaint.setStrokeWidth(mBorderWidth);mBitmapHeight = mBitmap.getHeight();mBitmapWidth = mBitmap.getWidth();/*** 设置边框矩形的坐标*/mBorderRect.set(0, 0, getWidth(), getHeight());/*** 设置边框圆形的半径为图片的宽度和高度的一半的最大值*/mBorderRadius = Math.max((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);/*** 设置图片矩形的坐标*/mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);/*** 设置图片圆形的半径为图片的宽度和高度的一半的最大值*/mDrawableRadius = Math.max(mDrawableRect.height() / 2, mDrawableRect.width() / 2);updateShaderMatrix();/*** 调用onDraw()方法进行绘画*/invalidate();}/*** 更新位图渲染*/private void updateShaderMatrix() {float scale;float dx = 0;float dy = 0;/*** 重置*/mShaderMatrix.set(null);/***计算缩放比，因为如果图片的尺寸超过屏幕，那么就会自动匹配到屏幕的尺寸去显示。* 确定移动的xy坐标**/if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {scale = mDrawableRect.width() / (float) mBitmapWidth;dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;} else {scale = mDrawableRect.height() / (float) mBitmapHeight;dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;}mShaderMatrix.setScale(scale, scale);mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);/*** 设置shader的本地矩阵*/mBitmapShader.setLocalMatrix(mShaderMatrix);}}

2.里面所使用到的ImageSizeUtil

public class ImageSizeUtil{/*** 根据ImageView获适当的压缩的宽和高* * @param imageView* @return*/public static ImageSize getImageViewSize(ImageView imageView){ImageSize imageSize = new ImageSize();DisplayMetrics displayMetrics = imageView.getContext().getResources().getDisplayMetrics();LayoutParams lp = imageView.getLayoutParams();int width = imageView.getWidth();// 获取imageview的实际宽度if (width <= 0){if(lp!=null){width = lp.width;// 获取imageview在layout中声明的宽度}}if (width <= 0){//width = imageView.getMaxWidth();// 检查最大值width = getImageViewFieldValue(imageView, "mMaxWidth");}if (width <= 0){width = displayMetrics.widthPixels;}int height = imageView.getHeight();// 获取imageview的实际高度if (height <= 0){if(lp!=null){height = lp.height;// 获取imageview在layout中声明的宽度}}if (height <= 0){height = getImageViewFieldValue(imageView, "mMaxHeight");// 检查最大值}if (height <= 0){height = displayMetrics.heightPixels;}imageSize.width = width;imageSize.height = height;return imageSize;}public static class ImageSize{public int width;public int height;}}

用法

布局文件

<com.bulemobi.yuandl.view.CircleImageViewandroid:id="@+id/ci"android:layout_width="180dp"android:layout_height="180dp"android:scaleType="centerCrop"android:layout_gravity="center_horizontal"app:border_width="1dp"app:border_color="#FF0000"/>

Activity中的代码,用xutils3加载图片

CircleImageView circleImageView= (CircleImageView) findViewById(R.id.ci);x.image().bind(circleImageView,url,new ImageOptions.Builder().setImageScaleType(ImageView.ScaleType.CENTER_CROP).build()

以上所述是小编给大家介绍的Android 自定义圆形头像CircleImageView支持加载网络图片的实现代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！