github上的圆形图片框架CircleImageView使用及解析

来源：互联网发布：王宝强日本知乎编辑：程序博客网时间：2024/04/30 11:38

github一个很轻巧的圆形图片类。在https://github.com/hdodenhof/CircleImageView。

除了处理圆形还能添加边框

CircleImageView使用

该类继承于ImageView ,除了在xml定义时使用它代替,其他的跟ImageView一样.该空间定义了三个自定义属性，使用的时候可选择是否添加

<de.hdodenhof.circleimageview.CircleImageView    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/profile_image"    android:layout_width="96dp"    android:layout_height="96dp"    android:src="@drawable/profile"    app:border_width="2dp"//圆形外边长度    app:border_overlay="false"//如果设置为true，图像会扩展到外边框中，如果外边框值过大，部分图像会被遮盖    app:border_color="#FF000000"/>

CircleImageView代码

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;    private static final int DEFAULT_BORDER_WIDTH = 0;    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;    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 int mBorderColor = DEFAULT_BORDER_COLOR;    private int mBorderWidth = DEFAULT_BORDER_WIDTH;    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 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);        //设置自定义属性        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);        mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);        mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);        mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_border_overlay, DEFAULT_BORDER_OVERLAY);        a.recycle();        init();    }    private void init() {        super.setScaleType(SCALE_TYPE);        mReady = true;        if (mSetupPending) {            setup();            mSetupPending = false;        }    }    //重写ScaleType，默认为CENTER_CROP，不让修改    @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.");        }    }    //画圆    @Override    protected void onDraw(Canvas canvas) {        if (getDrawable() == null) {            return;        }        //画圆        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);        //是否设置边框        if (mBorderWidth != 0) {            canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);        }    }    //imageview大小改变时调用    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        setup();    }    //设置图片边框    public int getBorderColor() {        return mBorderColor;    }    public void setBorderColor(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 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();    }    //重写设置图片    @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 = getBitmapFromDrawable(getDrawable());        setup();    }    //设置滤镜    @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 (OutOfMemoryError e) {            return null;        }    }    private void setup() {        if (!mReady) {            mSetupPending = true;            return;        }        if (mBitmap == null) {            return;        }        //设置着色器Shader.TileMode.CLAMP为拉伸，        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);        //消除锯齿        mBitmapPaint.setAntiAlias(true);        //添加着色器，画圆的时候直接画，会自动拉伸        mBitmapPaint.setShader(mBitmapShader);        //边框画笔，也就是设置画笔宽度，然后画个圆套在原来的圆上面        mBorderPaint.setStyle(Paint.Style.STROKE);        mBorderPaint.setAntiAlias(true);        mBorderPaint.setColor(mBorderColor);        mBorderPaint.setStrokeWidth(mBorderWidth);        mBitmapHeight = mBitmap.getHeight();        mBitmapWidth = mBitmap.getWidth();        mBorderRect.set(0, 0, getWidth(), getHeight());        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);        mDrawableRect.set(mBorderRect);        if (!mBorderOverlay) {            //调用之后，imageview的大小等于图标加上边框，所以当边框设置过大时会挡住部分图片            //否则的话，边框过大，只会比例缩小图片。            mDrawableRect.inset(mBorderWidth, mBorderWidth);        }        //图片半径为imageview的长度较小的一边        mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);        updateShaderMatrix();        invalidate();    }    private void updateShaderMatrix() {        float scale;        float dx = 0;        float dy = 0;        //重置        mShaderMatrix.set(null);        //为了避免view的宽或者高大于bitmap宽或者高而导致图标被拉伸，所以要将图片缩放到至少达到宽大于view的宽且长大于view的长        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;        }        //缩放        mShaderMatrix.setScale(scale, scale);        //平移缩放后的图像使其到中间        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);        mBitmapShader.setLocalMatrix(mShaderMatrix);    }}

0 0