Android 心形图片心形ImageView、带边框的的心形图片和圆形图片

CircleImageView.java

public class CircleImageView extends ImageView {
    private static final ImageView.ScaleType SCALE_TYPE = ImageView.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 int DEFAULT_IMAGE_ALPHA = 255;
    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 int mImageAlpha = DEFAULT_IMAGE_ALPHA;
    private Bitmap mBitmap;
    private Canvas mBitmapCanvas;
    private float mDrawableRadius;
    private float mBorderRadius;
    private ColorFilter mColorFilter;
    private boolean mInitialized;
    private boolean mRebuildShader;
    private boolean mDrawableDirty;
    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);
        mCircleBackgroundColor = a.getColor(R.styleable.CircleImageView_civ_circle_background_color, DEFAULT_CIRCLE_BACKGROUND_COLOR);
        a.recycle();
        init();
    }
    private void init() {
        mInitialized = true;
        super.setScaleType(SCALE_TYPE);
        mBitmapPaint.setAntiAlias(true);
        mBitmapPaint.setDither(true);
        mBitmapPaint.setFilterBitmap(true);
        mBitmapPaint.setAlpha(mImageAlpha);
        mBitmapPaint.setColorFilter(mColorFilter);
        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);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            setOutlineProvider(new OutlineProvider());
        }
    }
    @Override
    public void setScaleType(ImageView.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.");
        }
    }
    @SuppressLint("CanvasSize")
    @Override
    protected void onDraw(Canvas canvas) {
        if (mDisableCircularTransformation) {
            super.onDraw(canvas);
            return;
        }
        if (mCircleBackgroundColor != Color.TRANSPARENT) {
            canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mCircleBackgroundPaint);
        }
        if (mBitmap != null) {
            if (mDrawableDirty && mBitmapCanvas != null) {
                mDrawableDirty = false;
                Drawable drawable = getDrawable();
                drawable.setBounds(0, 0, mBitmapCanvas.getWidth(), mBitmapCanvas.getHeight());
                drawable.draw(mBitmapCanvas);
            }
            if (mRebuildShader) {
                mRebuildShader = false;
                BitmapShader bitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
                bitmapShader.setLocalMatrix(mShaderMatrix);
                mBitmapPaint.setShader(bitmapShader);
            }
            canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);
        }
        if (mBorderWidth > 0) {
            canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);
        }
    }
    @Override
    public void invalidateDrawable(@NonNull Drawable dr) {
        mDrawableDirty = true;
        invalidate();
    }
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        updateDimensions();
        invalidate();
    }
    @Override
    public void setPadding(int left, int top, int right, int bottom) {
        super.setPadding(left, top, right, bottom);
        updateDimensions();
        invalidate();
    }
    @Override
    public void setPaddingRelative(int start, int top, int end, int bottom) {
        super.setPaddingRelative(start, top, end, bottom);
        updateDimensions();
        invalidate();
    }
    public int getBorderColor() {
        return mBorderColor;
    }
    public void setBorderColor(@ColorInt int borderColor) {
        if (borderColor == mBorderColor) {
            return;
        }
        mBorderColor = borderColor;
        mBorderPaint.setColor(borderColor);
        invalidate();
    }
    public int getCircleBackgroundColor() {
        return mCircleBackgroundColor;
    }
    public void setCircleBackgroundColor(@ColorInt int circleBackgroundColor) {
        if (circleBackgroundColor == mCircleBackgroundColor) {
            return;
        }
        mCircleBackgroundColor = circleBackgroundColor;
        mCircleBackgroundPaint.setColor(circleBackgroundColor);
        invalidate();
    }
    
    @Deprecated
    public void setCircleBackgroundColorResource(@ColorRes int circleBackgroundRes) {
        setCircleBackgroundColor(getContext().getResources().getColor(circleBackgroundRes));
    }
    public int getBorderWidth() {
        return mBorderWidth;
    }
    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
        }
        mBorderWidth = borderWidth;
        mBorderPaint.setStrokeWidth(borderWidth);
        updateDimensions();
        invalidate();
    }
    public boolean isBorderOverlay() {
        return mBorderOverlay;
    }
    public void setBorderOverlay(boolean borderOverlay) {
        if (borderOverlay == mBorderOverlay) {
            return;
        }
        mBorderOverlay = borderOverlay;
        updateDimensions();
        invalidate();
    }
    public boolean isDisableCircularTransformation() {
        return mDisableCircularTransformation;
    }
    public void setDisableCircularTransformation(boolean disableCircularTransformation) {
        if (disableCircularTransformation == mDisableCircularTransformation) {
            return;
        }
        mDisableCircularTransformation = disableCircularTransformation;
        if (disableCircularTransformation) {
            mBitmap = null;
            mBitmapCanvas = null;
            mBitmapPaint.setShader(null);
        } else {
            initializeBitmap();
        }
        invalidate();
    }
    @Override
    public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
        initializeBitmap();
        invalidate();
    }
    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        initializeBitmap();
        invalidate();
    }
    @Override
    public void setImageResource(@DrawableRes int resId) {
        super.setImageResource(resId);
        initializeBitmap();
        invalidate();
    }
    @Override
    public void setImageURI(Uri uri) {
        super.setImageURI(uri);
        initializeBitmap();
        invalidate();
    }
    @Override
    public void setImageAlpha(int alpha) {
        alpha &= 0xFF;
        if (alpha == mImageAlpha) {
            return;
        }
        mImageAlpha = alpha;
        // This might be called during ImageView construction before
        // member initialization has finished on API level >= 16.
        if (mInitialized) {
            mBitmapPaint.setAlpha(alpha);
            invalidate();
        }
    }
    @Override
    public int getImageAlpha() {
        return mImageAlpha;
    }
    @Override
    public void setColorFilter(ColorFilter cf) {
        if (cf == mColorFilter) {
            return;
        }
        mColorFilter = cf;
        // This might be called during ImageView construction before
        // member initialization has finished on API level  0) {
            mDrawableRect.inset(mBorderWidth - 1.0f, mBorderWidth - 1.0f);
        }
        mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);
        updateShaderMatrix();
    }
    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() {
        if (mBitmap == null) {
            return;
        }
        float scale;
        float dx = 0;
        float dy = 0;
        mShaderMatrix.set(null);
        int bitmapHeight = mBitmap.getHeight();
        int bitmapWidth = mBitmap.getWidth();
        if (bitmapWidth * mDrawableRect.height() > mDrawableRect.width() * bitmapHeight) {
            scale = mDrawableRect.height() / (float) bitmapHeight;
            dx = (mDrawableRect.width() - bitmapWidth * scale) * 0.5f;
        } else {
            scale = mDrawableRect.width() / (float) bitmapWidth;
            dy = (mDrawableRect.height() - bitmapHeight * scale) * 0.5f;
        }
        mShaderMatrix.setScale(scale, scale);
        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);
        mRebuildShader = true;
    }
    @SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (mDisableCircularTransformation) {
            return super.onTouchEvent(event);
        }
        return inTouchableArea(event.getX(), event.getY()) && super.onTouchEvent(event);
    }
    private boolean inTouchableArea(float x, float y) {
        if (mBorderRect.isEmpty()) {
            return true;
        }
        return Math.pow(x - mBorderRect.centerX(), 2) + Math.pow(y - mBorderRect.centerY(), 2) <= Math.pow(mBorderRadius, 2);
    }
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private class OutlineProvider extends ViewOutlineProvider {
        @Override
        public void getOutline(View view, Outline outline) {
            if (mDisableCircularTransformation) {
                ViewOutlineProvider.BACKGROUND.getOutline(view, outline);
            } else {
                Rect bounds = new Rect();
                mBorderRect.roundOut(bounds);
                outline.setRoundRect(bounds, bounds.width() / 2.0f);
            }
        }
    }
}