自定义View圆角ImageView

package com.example.a04_circular_bead_imageview.circularbead;import android.annotation.SuppressLint;import android.content.Context;import android.content.res.ColorStateList;import android.content.res.Resources;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.Path;import android.graphics.PixelFormat;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Shader;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.graphics.drawable.LayerDrawable;import android.net.Uri;import android.util.AttributeSet;import android.util.Log;import android.widget.ImageView;import com.example.a04_circular_bead_imageview.R;/** * Created by yujie on 2017/12/1. */@SuppressLint("AppCompatCustomView")public class SelectableRoundedImageView extends ImageView{    public static final String TAG = "SelectableRoundedImageView";    private int mResource = 0;    private static final ScaleType[] sScaleTypeArray = {            ScaleType.MATRIX,            ScaleType.FIT_XY,            ScaleType.FIT_START,            ScaleType.FIT_CENTER,            ScaleType.FIT_END,            ScaleType.CENTER,            ScaleType.CENTER_CROP,            ScaleType.CENTER_INSIDE    };    // Set default scale type to FIT_CENTER, which is default scale type of    // original ImageView.    private ScaleType mScaleType = ScaleType.FIT_CENTER;    private float mLeftTopCornerRadius = 0.0f;    private float mRightTopCornerRadius = 0.0f;    private float mLeftBottomCornerRadius = 0.0f;    private float mRightBottomCornerRadius = 0.0f;    private float mBorderWidth = 0.0f;    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;    private ColorStateList mBorderColor = ColorStateList.valueOf(DEFAULT_BORDER_COLOR);    private boolean isOval = false;    private Drawable mDrawable;    private float[] mRadii = new float[] { 0, 0, 0, 0, 0, 0, 0, 0 };    public SelectableRoundedImageView(Context context) {        super(context);    }    public SelectableRoundedImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public SelectableRoundedImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray a = context.obtainStyledAttributes(attrs,                R.styleable.SelectableRoundedImageView, defStyle, 0);        final int index = a.getInt(R.styleable.SelectableRoundedImageView_android_scaleType, -1);        if (index >= 0) {            setScaleType(sScaleTypeArray[index]);        }        mLeftTopCornerRadius = a.getDimensionPixelSize(                R.styleable.SelectableRoundedImageView_sriv_left_top_corner_radius, 0);        mRightTopCornerRadius = a.getDimensionPixelSize(                R.styleable.SelectableRoundedImageView_sriv_right_top_corner_radius, 0);        mLeftBottomCornerRadius = a.getDimensionPixelSize(                R.styleable.SelectableRoundedImageView_sriv_left_bottom_corner_radius, 0);        mRightBottomCornerRadius = a.getDimensionPixelSize(                R.styleable.SelectableRoundedImageView_sriv_right_bottom_corner_radius, 0);        if (mLeftTopCornerRadius < 0.0f || mRightTopCornerRadius < 0.0f                || mLeftBottomCornerRadius < 0.0f || mRightBottomCornerRadius < 0.0f) {            throw new IllegalArgumentException("radius values cannot be negative.");        }        mRadii = new float[] {                mLeftTopCornerRadius, mLeftTopCornerRadius,                mRightTopCornerRadius, mRightTopCornerRadius,                mRightBottomCornerRadius, mRightBottomCornerRadius,                mLeftBottomCornerRadius, mLeftBottomCornerRadius };        mBorderWidth = a.getDimensionPixelSize(                R.styleable.SelectableRoundedImageView_sriv_border_width, 0);        if (mBorderWidth < 0) {            throw new IllegalArgumentException("border width cannot be negative.");        }        mBorderColor = a                .getColorStateList(R.styleable.SelectableRoundedImageView_sriv_border_color);        if (mBorderColor == null) {            mBorderColor = ColorStateList.valueOf(DEFAULT_BORDER_COLOR);        }        isOval = a.getBoolean(R.styleable.SelectableRoundedImageView_sriv_oval, false);        a.recycle();        updateDrawable();    }    @Override    protected void drawableStateChanged() {        super.drawableStateChanged();        invalidate();    }    @Override    public ScaleType getScaleType() {        return mScaleType;    }    @Override    public void setScaleType(ScaleType scaleType) {        super.setScaleType(scaleType);        mScaleType = scaleType;        updateDrawable();    }    @Override    public void setImageDrawable(Drawable drawable) {        mResource = 0;        mDrawable = SelectableRoundedCornerDrawable.fromDrawable(drawable, getResources());        super.setImageDrawable(mDrawable);        updateDrawable();    }    @Override    public void setImageBitmap(Bitmap bm) {        mResource = 0;        mDrawable = SelectableRoundedCornerDrawable.fromBitmap(bm, getResources());        super.setImageDrawable(mDrawable);        updateDrawable();    }    @Override    public void setImageResource(int resId) {        if (mResource != resId) {            mResource = resId;            mDrawable = resolveResource();            super.setImageDrawable(mDrawable);            updateDrawable();        }    }    @Override    public void setImageURI(Uri uri) {        super.setImageURI(uri);        setImageDrawable(getDrawable());    }    private Drawable resolveResource() {        Resources rsrc = getResources();        if (rsrc == null) {            return null;        }        Drawable d = null;        if (mResource != 0) {            try {                d = rsrc.getDrawable(mResource);            } catch (Resources.NotFoundException e) {                Log.w("NotFound", "Unable to find resource: " + mResource, e);                // Don't try again.                mResource = 0;            }        }        return SelectableRoundedCornerDrawable.fromDrawable(d, getResources());    }    private void updateDrawable() {        if (mDrawable == null) {            return;        }        ((SelectableRoundedCornerDrawable) mDrawable).setScaleType(mScaleType);        ((SelectableRoundedCornerDrawable) mDrawable).setCornerRadii(mRadii);        ((SelectableRoundedCornerDrawable) mDrawable).setBorderWidth(mBorderWidth);        ((SelectableRoundedCornerDrawable) mDrawable).setBorderColor(mBorderColor);        ((SelectableRoundedCornerDrawable) mDrawable).setOval(isOval);    }    public float getCornerRadius() {        return mLeftTopCornerRadius;    }    /**     * Set radii for each corner.     *     * @param leftTop The desired radius for left-top corner in dip.     * @param rightTop The desired desired radius for right-top corner in dip.     * @param leftBottom The desired radius for left-bottom corner in dip.     * @param rightBottom The desired radius for right-bottom corner in dip.     *     */    public void setCornerRadiiDP(float leftTop, float rightTop, float leftBottom, float rightBottom) {        final float density = getResources().getDisplayMetrics().density;        final float lt = leftTop * density;        final float rt = rightTop * density;        final float lb = leftBottom * density;        final float rb = rightBottom * density;        mRadii = new float[] { lt, lt, rt, rt, rb, rb, lb, lb };        updateDrawable();    }    public float getBorderWidth() {        return mBorderWidth;    }    /**     * Set border width.     *     * @param width     *            The desired width in dip.     */    public void setBorderWidthDP(float width) {        float scaledWidth = getResources().getDisplayMetrics().density * width;        if (mBorderWidth == scaledWidth) {            return;        }        mBorderWidth = scaledWidth;        updateDrawable();        invalidate();    }    public int getBorderColor() {        return mBorderColor.getDefaultColor();    }    public void setBorderColor(int color) {        setBorderColor(ColorStateList.valueOf(color));    }    public ColorStateList getBorderColors() {        return mBorderColor;
    }
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