Android(安卓)圆形ImageView

在Android开发中，类似于头像之类的一些有的时候会需要用到圆形的图标去显示。但是由于图片的不确定性，不可能一个个的去拿来修成圆形。下面就贴上具体代码！

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.Outline;import android.graphics.Paint;import android.graphics.Rect;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.net.Uri;import android.os.Build;import android.support.annotation.ColorInt;import android.support.annotation.ColorRes;import android.support.annotation.DrawableRes;import android.support.annotation.RequiresApi;import android.util.AttributeSet;import android.view.View;import android.view.ViewOutlineProvider;import android.widget.ImageView;   /** *  */ public class CircleImageView extends android.support.v7.widget.AppCompatImageView {     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_CIRCLE_BACKGROUND_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 mCircleBackgroundPaint = new Paint();     private int mBorderColor = DEFAULT_BORDER_COLOR;    private int mBorderWidth = DEFAULT_BORDER_WIDTH;    private int mCircleBackgroundColor = DEFAULT_CIRCLE_BACKGROUND_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;    private boolean mDisableCircularTransformation;     public CircleImageView(Context context) {        super(context);         init();    }     public CircleImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }     public CircleImageView(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);         // Look for deprecated civ_fill_color if civ_circle_background_color is not set        if (a.hasValue(R.styleable.CircleImageView_civ_circle_background_color)) {            mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_circle_background_color,                    DEFAULT_CIRCLE_BACKGROUND_COLOR);        } else if (a.hasValue(R.styleable.CircleImageView_civ_fill_color)) {            mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_fill_color,                    DEFAULT_CIRCLE_BACKGROUND_COLOR);        }         a.recycle();         init();    }     private void init() {        super.setScaleType(SCALE_TYPE);        mReady = true;         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            setOutlineProvider(new OutlineProvider());        }         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 (mDisableCircularTransformation) {            super.onDraw(canvas);            return;        }         if (mBitmap == null) {            return;        }         if (mCircleBackgroundColor != Color.TRANSPARENT) {            canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mCircleBackgroundPaint);        }        canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);        if (mBorderWidth > 0) {            canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);        }    }     @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        setup();    }     @Override    public void setPadding(int left, int top, int right, int bottom) {        super.setPadding(left, top, right, bottom);        setup();    }     @Override    public void setPaddingRelative(int start, int top, int end, int bottom) {        super.setPaddingRelative(start, top, end, bottom);        setup();    }     public int getBorderColor() {        return mBorderColor;    }     public void setBorderColor(@ColorInt int borderColor) {        if (borderColor == mBorderColor) {            return;        }         mBorderColor = borderColor;        mBorderPaint.setColor(mBorderColor);        invalidate();    }     /**     * @deprecated Use {@link #setBorderColor(int)} instead     */    @Deprecated    public void setBorderColorResource(@ColorRes int borderColorRes) {        setBorderColor(getContext().getResources().getColor(borderColorRes));    }     public int getCircleBackgroundColor() {        return mCircleBackgroundColor;    }     public void setCircleBackgroundColor(@ColorInt int circleBackgroundColor) {        if (circleBackgroundColor == mCircleBackgroundColor) {            return;        }         mCircleBackgroundColor = circleBackgroundColor;        mCircleBackgroundPaint.setColor(circleBackgroundColor);        invalidate();    }     public void setCircleBackgroundColorResource(@ColorRes int circleBackgroundRes) {        setCircleBackgroundColor(getContext().getResources().getColor(circleBackgroundRes));    }     /**     * Return the color drawn behind the circle-shaped drawable.     *     * @return The color drawn behind the drawable     *     * @deprecated Use {@link #getCircleBackgroundColor()} instead.     */    @Deprecated    public int getFillColor() {        return getCircleBackgroundColor();    }     /**     * Set a color to be drawn behind the circle-shaped drawable. Note that     * this has no effect if the drawable is opaque or no drawable is set.     *     * @param fillColor The color to be drawn behind the drawable     *     * @deprecated Use {@link #setCircleBackgroundColor(int)} instead.     */    @Deprecated    public void setFillColor(@ColorInt int fillColor) {        setCircleBackgroundColor(fillColor);    }     /**     * Set a color to be drawn behind the circle-shaped drawable. Note that     * this has no effect if the drawable is opaque or no drawable is set.     *     * @param fillColorRes The color resource to be resolved to a color and     *                     drawn behind the drawable     *     * @deprecated Use {@link #setCircleBackgroundColorResource(int)} instead.     */    @Deprecated    public void setFillColorResource(@ColorRes int fillColorRes) {        setCircleBackgroundColorResource(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();    }     public boolean isDisableCircularTransformation() {        return mDisableCircularTransformation;    }     public void setDisableCircularTransformation(boolean disableCircularTransformation) {        if (mDisableCircularTransformation == disableCircularTransformation) {            return;        }         mDisableCircularTransformation = disableCircularTransformation;        initializeBitmap();    }     @Override    public void setImageBitmap(Bitmap bm) {        super.setImageBitmap(bm);        initializeBitmap();    }     @Override    public void setImageDrawable(Drawable drawable) {        super.setImageDrawable(drawable);        initializeBitmap();    }     @Override    public void setImageResource(@DrawableRes int resId) {        super.setImageResource(resId);        initializeBitmap();    }     @Override    public void setImageURI(Uri uri) {        super.setImageURI(uri);        initializeBitmap();    }     @Override    public void setColorFilter(ColorFilter cf) {        if (cf == mColorFilter) {            return;        }         mColorFilter = cf;        applyColorFilter();        invalidate();    }     @Override    public ColorFilter getColorFilter() {        return mColorFilter;    }     private void applyColorFilter() {        if (mBitmapPaint != null) {            mBitmapPaint.setColorFilter(mColorFilter);        }    }     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 initializeBitmap() {        if (mDisableCircularTransformation) {            mBitmap = null;        } else {            mBitmap = getBitmapFromDrawable(getDrawable());        }        setup();    }     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);         mCircleBackgroundPaint.setStyle(Paint.Style.FILL);        mCircleBackgroundPaint.setAntiAlias(true);        mCircleBackgroundPaint.setColor(mCircleBackgroundColor);         mBitmapHeight = mBitmap.getHeight();        mBitmapWidth = mBitmap.getWidth();         mBorderRect.set(calculateBounds());        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);         mDrawableRect.set(mBorderRect);        if (!mBorderOverlay && mBorderWidth > 0) {            mDrawableRect.inset(mBorderWidth - 1.0f, mBorderWidth - 1.0f);        }        mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);         applyColorFilter();        updateShaderMatrix();        invalidate();    }     private RectF calculateBounds() {        int availableWidth  = getWidth() - getPaddingLeft() - getPaddingRight();        int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();         int sideLength = Math.min(availableWidth, availableHeight);         float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;        float top = getPaddingTop() + (availableHeight - sideLength) / 2f;         return new RectF(left, top, left + sideLength, top + sideLength);    }     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);    }     @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    private class OutlineProvider extends ViewOutlineProvider {         @Override        public void getOutline(View view, Outline outline) {            Rect bounds = new Rect();            mBorderRect.roundOut(bounds);            outline.setRoundRect(bounds, bounds.width() / 2.0f);        }     } }

在values下新建attrs文件

<?xml version="1.0" encoding="utf-8"?>

之后再xml布局中直接引用就好

在Android开发中，类似于头像之类的一些有的时候会需要用到圆形的图标去显示。但是由于图片的不确定性，不可能一个个的去拿来修成圆形。下面就贴上具体代码！

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