CircleImageView自定义圆形控件的使用

怼烎@ 2023-07-13 13:38 36阅读 0赞

1.自定义圆形控件github地址：https://github.com/hdodenhof/CircleImageView

package de.hdodenhof.circleimageview;
    import edu.njupt.zhb.main.R;
    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.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.util.AttributeSet;
    import android.widget.ImageView;
     
    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 = 1;
     
        private static final int DEFAULT_BORDER_WIDTH = 0;
        private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
     
        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 boolean mReady;
        private boolean mSetupPending;
     
        public CircleImageView(Context context) {
            super(context);
        }
     
        public CircleImageView(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
     
        public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            super.setScaleType(SCALE_TYPE);
     
            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);
     
            a.recycle();
     
            mReady = true;
     
            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
        protected void onDraw(Canvas canvas) {
            if (getDrawable() == null) {
                return;
            }
     
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);
        }
     
        @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(int borderColor) {
            if (borderColor == mBorderColor) {
                return;
            }
     
            mBorderColor = borderColor;
            mBorderPaint.setColor(mBorderColor);
            invalidate();
        }
     
        public int getBorderWidth() {
            return mBorderWidth;
        }
     
        public void setBorderWidth(int borderWidth) {
            if (borderWidth == mBorderWidth) {
                return;
            }
     
            mBorderWidth = borderWidth;
            setup();
        }
     
        @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(int resId) {
            super.setImageResource(resId);
            mBitmap = getBitmapFromDrawable(getDrawable());
            setup();
        }
     
        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;
            }
     
            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);
     
            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(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);
            mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);
     
            updateShaderMatrix();
            invalidate();
        }
     
        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) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);
     
            mBitmapShader.setLocalMatrix(mShaderMatrix);
        }
    }

自定义的属性：res/values/attrs.xml

<?xml version=“1.0” encoding=“utf-8”?>
    <resources>
        <declare-styleable name=“CircleImageView”>
            <attr name=“border_width” format=“dimension” />
            <attr name=“border_color” format=“color” />
        </declare-styleable>
    </resources>

使用时的布局文件：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:padding="@dimen/base_padding"
            android:background="@color/light">
     
            <de.hdodenhof.circleimageview.CircleImageView
                android:layout_width="160dp"
                android:layout_height="160dp"
                android:layout_centerInParent="true"
                android:src="@drawable/demo"
                app:border_width="2dp"
                app:border_color="@color/dark" />
     
        </RelativeLayout>
     
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:padding="@dimen/base_padding"
            android:background="@color/dark">
     
            <de.hdodenhof.circleimageview.CircleImageView
                android:layout_width="160dp"
                android:layout_height="160dp"
                android:layout_centerInParent="true"
                android:src="@drawable/lena"
                app:border_width="2dp"
                app:border_color="@color/light" />
     
        </RelativeLayout>
     
    </LinearLayout>

效果：

![Center][]

Demo下载：http://download.csdn.net/detail/nuptboyzhb/7284553

注意：有些开发者可能也发现了，如果我们需要一个圆形的ImageButton的话，其实，我们没有必要自己写。如果ImageButton的图标是固定不变的，我们完全可以让设计师给我设计一个圆形的图片，然后直接设置再ImageButton上就可以了。但是，请注意，我们这里的圆形ImageView是自定义控件，也即是：无论你设置的图片是什么样的，显示出来的就是圆的。比如：易信中用户头像的设置，无论用户拍什么的照片，显示出来都是一个圆的。

**拓展阅读**：

还有一个更加强大的RoundedImageView，还支持圆角，椭圆等等。

https://github.com/vinc3m1/RoundedImageView

[Center]: https://img-blog.csdn.net/20140502205208359?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbnVwdDEyMzQ1Njc4OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center