圆形的Volley.NetworkImageView控件的实现

github上有个开源项目CircleImageView，可以简单的实现一个圆形的ImageView，就像qq头像那样。

NetworkImageView是volley中的一个组件，可以方便的加载网络图片并显示出来。

CircleImageView不能自动加载网络图片，NetworkImageView不能设置成圆形，但是目前项目中就是需要这样做，这要怎么办呢？

于是去看了看两者的源码，都是继承ImagevView的，并且CircleImageView的实现要比较简单一些。于是就有了一个思路，自己把CircleImageView重写一遍，将CircleImageView的父类由ImageView改为NetworkImageView，这样的话就可以结合两者的优点。

代码如下，请先自己引入Volley依赖。

package com.mmia.widget;
 
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.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RadialGradient;
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.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.net.Uri;
import android.support.annotation.ColorInt;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.animation.Animation;
 
import com.android.volley.toolbox.NetworkImageView;
import com.mmia.client.R;
 
/**
 * csonezp
 * 圆形的NetworkImageview
 * 代码来自开源项目CircleImageView
 */
public class CircleNetworkImage extends NetworkImageView {
 
    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 = 2;
 
    private static final int DEFAULT_BORDER_WIDTH = 0;
    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
    private static final int DEFAULT_FILL_COLOR = Color.TRANSPARENT;
    private static final boolean DEFAULT_BORDER_OVERLAY = false;
 
    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 final Paint mFillPaint = new Paint();
 
    private int mBorderColor = DEFAULT_BORDER_COLOR;
    private int mBorderWidth = DEFAULT_BORDER_WIDTH;
    private int mFillColor = DEFAULT_FILL_COLOR;
 
    private Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private int mBitmapWidth;
    private int mBitmapHeight;
 
    private float mDrawableRadius;
    private float mBorderRadius;
 
    private ColorFilter mColorFilter;
 
    private boolean mReady;
    private boolean mSetupPending;
    private boolean mBorderOverlay;
 
    public CircleNetworkImage(Context context) {
        super(context);
 
        init();
    }
 
    public CircleNetworkImage(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
 
    public CircleNetworkImage(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
 
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
 
        mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);
        mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);
        mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);
        mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);
 
        a.recycle();
 
        init();
    }
 
    private void init() {
        super.setScaleType(SCALE_TYPE);
        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
    public void setAdjustViewBounds(boolean adjustViewBounds) {
        if (adjustViewBounds) {
            throw new IllegalArgumentException("adjustViewBounds not supported.");
        }
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        if (mBitmap == null) {
            return;
        }
 
        if (mFillColor != Color.TRANSPARENT) {
            canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mFillPaint);
        }
        canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mBitmapPaint);
        if (mBorderWidth != 0) {
            canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, 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(@ColorInt int borderColor) {
        if (borderColor == mBorderColor) {
            return;
        }
 
        mBorderColor = borderColor;
        mBorderPaint.setColor(mBorderColor);
        invalidate();
    }
 
    public void setBorderColorResource(@ColorRes int borderColorRes) {
        setBorderColor(getContext().getResources().getColor(borderColorRes));
    }
 
    public int getFillColor() {
        return mFillColor;
    }
 
    public void setFillColor(@ColorInt int fillColor) {
        if (fillColor == mFillColor) {
            return;
        }
 
        mFillColor = fillColor;
        mFillPaint.setColor(fillColor);
        invalidate();
    }
 
    public void setFillColorResource(@ColorRes int fillColorRes) {
        setFillColor(getContext().getResources().getColor(fillColorRes));
    }
 
    public int getBorderWidth() {
        return mBorderWidth;
    }
 
    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
        }
 
        mBorderWidth = borderWidth;
        setup();
    }
 
    public boolean isBorderOverlay() {
        return mBorderOverlay;
    }
 
    public void setBorderOverlay(boolean borderOverlay) {
        if (borderOverlay == mBorderOverlay) {
            return;
        }
 
        mBorderOverlay = borderOverlay;
        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(@DrawableRes int resId) {
        super.setImageResource(resId);
        mBitmap = getBitmapFromDrawable(getDrawable());
        setup();
    }
 
    @Override
    public void setImageURI(Uri uri) {
        super.setImageURI(uri);
        mBitmap = uri != null ? getBitmapFromDrawable(getDrawable()) : null;
        setup();
    }
 
    @Override
    public void setColorFilter(ColorFilter cf) {
        if (cf == mColorFilter) {
            return;
        }
 
        mColorFilter = cf;
        mBitmapPaint.setColorFilter(mColorFilter);
        invalidate();
    }
 
    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 (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    private void setup() {
        if (!mReady) {
            mSetupPending = true;
            return;
        }
 
        if (getWidth() == 0 && getHeight() == 0) {
            return;
        }
 
        if (mBitmap == null) {
            invalidate();
            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);
 
        mFillPaint.setStyle(Paint.Style.FILL);
        mFillPaint.setAntiAlias(true);
        mFillPaint.setColor(mFillColor);
 
        mBitmapHeight = mBitmap.getHeight();
        mBitmapWidth = mBitmap.getWidth();
 
        mBorderRect.set(0, 0, getWidth(), getHeight());
        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);
 
        mDrawableRect.set(mBorderRect);
        if (!mBorderOverlay) {
            mDrawableRect.inset(mBorderWidth, mBorderWidth);
        }
        mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);
 
        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) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);
 
        mBitmapShader.setLocalMatrix(mShaderMatrix);
    }
 
}

这样就实现了所需要的效果。