我要评论这几天做项目，有些地方的图片需要用到圆形图片，所以百度了一下，在github上找到一个开源项目，处理很简单，效果如下：
使用起来特别简单，一共三步，具体如下：
1、创建一个java类circleimageview把下面的代码复制过去，报错的导包
package de.hdodenhof.circleimageview;
import edu.njupt.zhb.main.r;
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);
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);
}
}
2、在values文件夹下面创建一个xlm文件attrs.xml把下面的代码复制进去
<?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>
3、接下来就是使用了，直接在布局文件中使用，具体使用如下：
直接创建一个自定义的circleimageview src属性设置你要改变成圆形的图片
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ff00ff" > <com.example.circleimageview.circleimageview android:id="@+id/imageview" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerinparent="true" android:src="@drawable/control_image" /> </relativelayout>
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移动技术网。
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