Android CircleImageView自定义圆环头像控件的使用

1：最近项目中在做一个圆形头像，之前用的只是简单的圆形，现在整理的需求是圆环，于是折腾了下，查找了资料，总结如下：

原理：先在canvas上面画一个圆形，参照圆形的起点坐标、半径，再画一个边长为圆的直径的bitmap（这个bitmap就是你想画的圆形头像），此时圆和bitmap重叠在一起，圆在下面，bitmap在上面，bitmap覆盖着圆。

public Bitmap toRoundBitmap(Bitmap bitmap) {    //圆形图片宽高    int width = bitmap.getWidth();    int height = bitmap.getHeight();    //正方形的边长    int r = 0;    //取最短边做边长    if(width > height) {    r = height;    } else {    r = width;    }    //构建一个bitmap    Bitmap backgroundBmp = Bitmap.createBitmap(width,    height, Config.ARGB_8888);    //new一个Canvas，在backgroundBmp上画图    Canvas canvas = new Canvas(backgroundBmp);    Paint paint = new Paint();    //设置边缘光滑，去掉锯齿    paint.setAntiAlias(true);    //宽高相等，即正方形    RectF rect = new RectF(0, 0, r, r);    //通过制定的rect画一个圆角矩形，当圆角X轴方向的半径等于Y轴方向的半径时，    //且都等于r/2时，画出来的圆角矩形就是圆形    canvas.drawRoundRect(rect, r/2, r/2, paint);    //设置当两个图形相交时的模式，SRC_IN为取SRC图形相交的部分，多余的将被去掉    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));    //canvas将bitmap画在backgroundBmp上    canvas.drawBitmap(bitmap, null, rect, paint);    //返回已经绘画好的backgroundBmp    return backgroundBmp;    }  

2：强烈推荐这篇文章：https://github.com/hdodenhof/CircleImageView点击打开链接，直接可以在AS上引用

Gradle配置文件中直接引用：

compile 'de.hdodenhof:circleimageview:2.0.0'

1. 在需要使用的地方直接布局：

<de.hdodenhof.circleimageview.CircleImageView    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/myinfo_user_headimg"    android:layout_width="61dp"    android:layout_height="61dp"    android:layout_centerInParent="true"    android:src="@mipmap/myinfo_un_login_icon"    app:civ_border_width="2dp"    app:civ_border_color="#FFCC9C"/>

说是支持所有类型的drawables，优点：

1：不用canvas画两次，即不用setXfermode

2：不用复制bitmap

3:不用裁剪路径，这样也就没有硬件加速开销

限制：目前用的Giide图片加载，dontAnimate()

主要的类：

<pre name="code" class="java">package com.example.user.myapplication;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;/** * Author:  Chen.yuan * Email:   [e-mail] * Date:    2016/5/24 14:20 * Description:圆形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);    }}

自定义的属性：res/values/attrs.xml

<pre name="code" class="java"><?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>

使用时的布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><RelativeLayout    android:layout_width="match_parent"    android:layout_height="0dp"    android:layout_weight="1"    android:background="#ffffff">    <com.example.user.myapplication.CircleImageView        android:layout_width="160dp"        android:layout_height="160dp"        android:layout_centerInParent="true"        android:src="@mipmap/tup"        app:border_width="2dp"        app:border_color="#FFCC9C" /></RelativeLayout><RelativeLayout    android:layout_width="match_parent"    android:layout_height="0dp"    android:layout_weight="1"    android:background="#ffffff">    <com.example.user.myapplication.CircleImageView        android:layout_width="160dp"        android:layout_height="160dp"        android:layout_centerInParent="true"        android:src="@mipmap/tup"        app:border_width="2dp"        app:border_color="#FFCC9C" /></RelativeLayout></LinearLayout>

运行效果图：