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。