Android(安卓)圆形图圆形ImageView

package com.example.mywhaleai.view;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.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.util.AttributeSet;import android.widget.ImageView;import androidx.annotation.ColorInt;import androidx.annotation.ColorRes;import androidx.annotation.DrawableRes;import com.example.mywhaleai.R;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 = 2;    /*默认参数*/    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;    private boolean mDisableCircularTransformation;    public CircleImageView(Context context) {        super(context);        init();    }    /*构造函数*/    public CircleImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    /*构造函数，从xml中获取参数自定义的参数信息*/    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);//        mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);        mFillColor=a.getColor(R.styleable.CircleImageView_civ_border_color,DEFAULT_FILL_COLOR);        a.recycle();        init();    }    /*初始化*/    private void init() {        super.setScaleType(SCALE_TYPE);        mReady = true;        if (mSetupPending) {            setup();            mSetupPending = false;        }    }    @Override    public ScaleType getScaleType() {        return SCALE_TYPE;    }    /*非SCALE_TYPE就报错*/    @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 (mFillColor != Color.TRANSPARENT) {            canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mFillPaint);//底色 mFillColor --> 画笔 mFillPaint        }        canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint); //画圆形图片        if (mBorderWidth > 0) {            canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);//画边框，如果边框的宽度大于0才走进这里面        }    }    @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();    }    /**     * @deprecated Use {@link #setBorderColor(int)} instead     */    @Deprecated    public void setBorderColorResource(@ColorRes int borderColorRes) {        setBorderColor(getContext().getResources().getColor(borderColorRes));    }    /**     * Return the color drawn behind the circle-shaped drawable.     *     * @return The color drawn behind the drawable     *     * @deprecated Fill color support is going to be removed in the future     */    @Deprecated    public int getFillColor() {        return mFillColor;    }    /**     * 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 Fill color support is going to be removed in the future     */    @Deprecated    public void setFillColor(@ColorInt int fillColor) {        if (fillColor == mFillColor) {            return;        }        mFillColor = fillColor;        mFillPaint.setColor(fillColor);        invalidate();    }    /**     * 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 Fill color support is going to be removed in the future     */    @Deprecated    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();    }    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();    }    /*这是个非常关键的方法，每次重绘都需要调用setup，需要在这里面转换bitmap计算圆形的半径和边框的半径长度，调用invalidate 重绘。*/    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);// 这里就把我们设置下去的图片放到了mBitmapShader当中，在ondraw里面直接drawcircle是就已经带图片的圆形了        mBitmapPaint.setAntiAlias(true);        mBitmapPaint.setShader(mBitmapShader);  //设置shader 给mBitmapPaint        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(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);    }}
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