Android利用CircleImageView实现圆形头像的方法

circleimageview实现圆形头像代码分享，供大家参考，具体内容如下

一、创建属性文件(attrs.xml)

具体操作：
1、在项目的values文件底下创建一新的属性文件，文件名为attrs：new->xml->values xml file:

 2、补充attrs.xml代码：

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

二、添加实现类（circleimageview.java）

circleimageview.java（可以直接引用，看不懂也没事）：

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;
public class circleimageview extends imageview {
 private static final scaletype scale_type = scaletype.center_crop;
 private static final bitmap.config bitmap_config = bitmap.config.argb_8888;
 private static final int colordrawable_dimension = 1;
 private static final int default_border_width = 0;
 private static final int default_border_color = color.black;
 private final rectf mdrawablerect = new rectf();
 private final rectf mborderrect = new rectf();
 private final matrix mshadermatrix = new matrix();
 private final paint mbitmappaint = new paint();
 private final paint mborderpaint = new paint();
 private int mbordercolor = default_border_color;
 private int mborderwidth = default_border_width;
 private bitmap mbitmap;
 private bitmapshader mbitmapshader;
 private int mbitmapwidth;
 private int mbitmapheight;
 private float mdrawableradius;
 private float mborderradius;
 private boolean mready;
 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);
 typedarray a = context.obtainstyledattributes(attrs,
  r.styleable.circleimageview, defstyle, 0);
 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;
 }
 }
 @override
 public scaletype getscaletype() {
 return scale_type;
 }
 @override
 public void setscaletype(scaletype scaletype) {
 if (scaletype != scale_type) {
  throw new illegalargumentexception(string.format(
  "scaletype %s not supported.", scaletype));
 }
 }
 @override
 protected void ondraw(canvas canvas) {
 if (getdrawable() == null) {
  return;
 }
 canvas.drawcircle(getwidth() / 2, getheight() / 2, mdrawableradius,
  mbitmappaint);
 if (mborderwidth != 0) {
  canvas.drawcircle(getwidth() / 2, getheight() / 2, mborderradius,
  mborderpaint);
 }
 }
 @override
 protected void onsizechanged(int w, int h, int oldw, int oldh) {
 super.onsizechanged(w, h, oldw, oldh);
 setup();
 }
 public int getbordercolor() {
 return mbordercolor;
 }
 public void setbordercolor(int bordercolor) {
 if (bordercolor == mbordercolor) {
  return;
 }
 mbordercolor = bordercolor;
 mborderpaint.setcolor(mbordercolor);
 invalidate();
 }
 public int getborderwidth() {
 return mborderwidth;
 }
 public void setborderwidth(int borderwidth) {
 if (borderwidth == mborderwidth) {
  return;
 }
 mborderwidth = borderwidth;
 setup();
 }
 @override
 public void setimagebitmap(bitmap bm) {
 super.setimagebitmap(bm);
 mbitmap = bm;
 setup();
 }
 @override
 public void setimagedrawable(drawable drawable) {
 super.setimagedrawable(drawable);
 mbitmap = getbitmapfromdrawable(drawable);
 setup();
 }
 @override
 public void setimageresource(int resid) {
 super.setimageresource(resid);
 mbitmap = getbitmapfromdrawable(getdrawable());
 setup();
 }
 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 {
  bitmap = bitmap.createbitmap(drawable.getintrinsicwidth(),
   drawable.getintrinsicheight(), 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;
 }
 }
 private void setup() {
 if (!mready) {
  msetuppending = true;
  return;
 }
 if (mbitmap == null) {
  return;
 }
 mbitmapshader = new bitmapshader(mbitmap, shader.tilemode.clamp, shader.tilemode.clamp);
 mbitmappaint.setantialias(true);
 mbitmappaint.setshader(mbitmapshader);
 mborderpaint.setstyle(paint.style.stroke);
 mborderpaint.setantialias(true);
 mborderpaint.setcolor(mbordercolor);
 mborderpaint.setstrokewidth(mborderwidth);
 mbitmapheight = mbitmap.getheight();
 mbitmapwidth = mbitmap.getwidth();
 mborderrect.set(0, 0, getwidth(), getheight());
 mborderradius = math.min((mborderrect.height() - mborderwidth) / 2,
  (mborderrect.width() - mborderwidth) / 2);
 mdrawablerect.set(mborderwidth, mborderwidth, mborderrect.width()
  - mborderwidth, mborderrect.height() - mborderwidth);
 mdrawableradius = math.min(mdrawablerect.height() / 2,
  mdrawablerect.width() / 2);
 updateshadermatrix();
 invalidate();
 }
 private void updateshadermatrix() {
 float scale;
 float dx = 0;
 float dy = 0;
 mshadermatrix.set(null);
 if (mbitmapwidth * mdrawablerect.height() > mdrawablerect.width()
  * mbitmapheight) {
  scale = mdrawablerect.height() / (float) mbitmapheight;
  dx = (mdrawablerect.width() - mbitmapwidth * scale) * 0.5f;
 } else {
  scale = mdrawablerect.width() / (float) mbitmapwidth;
  dy = (mdrawablerect.height() - mbitmapheight * scale) * 0.5f;
 }
 mshadermatrix.setscale(scale, scale);
 mshadermatrix.posttranslate((int) (dx + 0.5f) + mborderwidth,
  (int) (dy + 0.5f) + mborderwidth);
 mbitmapshader.setlocalmatrix(mshadermatrix);
 }
}

三、circleimageview的使用

具体操作：

1、先把你想要的图片拷贝到项目的res->drawable底下：

2、直接在布局文件引用： 

 <com.example.suqh.drop.circleimageview
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:src="@drawable/img3" />

3、编译程序：

引用新建的类会出现下面这种情况的问题，直接点击build去编译程序：

 4、还是不行的话重新编译程序：

5、效果图：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。