AndroidClipSquare安卓实现方形头像裁剪

jopen 10年前

安卓实现方形头像裁剪

实现思路,界面可见区域为2层View

最顶层的View是显示层,主要绘制半透明边框区域和白色裁剪区域,代码比较容易。

第二层继承ImageView,使用ImageView的Matrix实现显示部分图片,及挪动,放大缩小等操作。

比较复杂的地方在于多指操作对ImageView的影响,详见代码:

ClipSquareImageView.java
    package com.h3c.androidclipsquare;                import android.annotation.TargetApi;        import android.content.Context;        import android.graphics.Bitmap;        import android.graphics.Canvas;        import android.graphics.Matrix;        import android.graphics.RectF;        import android.graphics.drawable.Drawable;        import android.os.Build;        import android.util.AttributeSet;        import android.view.GestureDetector;        import android.view.MotionEvent;        import android.view.ScaleGestureDetector;        import android.view.VelocityTracker;        import android.view.View;        import android.view.ViewConfiguration;        import android.view.ViewTreeObserver;        import android.widget.ImageView;                /**         * Created by H3c on 12/13/14.         */        public class ClipSquareImageView extends ImageView implements View.OnTouchListener, ViewTreeObserver.OnGlobalLayoutListener {            private static final int BORDERDISTANCE = ClipSquareView.BORDERDISTANCE;                    public static final float DEFAULT_MAX_SCALE = 4.0f;            public static final float DEFAULT_MID_SCALE = 2.0f;            public static final float DEFAULT_MIN_SCALE = 1.0f;                    private float minScale = DEFAULT_MIN_SCALE;            private float midScale = DEFAULT_MID_SCALE;            private float maxScale = DEFAULT_MAX_SCALE;                    private MultiGestureDetector multiGestureDetector;            private boolean isIniting;// 正在初始化                            private Matrix defaultMatrix = new Matrix();// 初始化的图片矩阵,控制图片撑满屏幕及显示区域            private Matrix dragMatrix = new Matrix();// 拖拽放大过程中动态的矩阵            private Matrix finalMatrix = new Matrix();// 最终显示的矩阵            private final RectF displayRect = new RectF();// 图片的真实大小            private final float[] matrixValues = new float[9];                    private int borderlength;                    public ClipSquareImageView(Context context, AttributeSet attrs) {                super(context, attrs);                super.setScaleType(ScaleType.MATRIX);                setOnTouchListener(this);                multiGestureDetector = new MultiGestureDetector(context);            }                    @Override            protected void onAttachedToWindow() {                super.onAttachedToWindow();                getViewTreeObserver().addOnGlobalLayoutListener(this);            }                    @SuppressWarnings("deprecation")            @Override            protected void onDetachedFromWindow() {                super.onDetachedFromWindow();                getViewTreeObserver().removeGlobalOnLayoutListener(this);            }                    @Override            public void onGlobalLayout() {                if(isIniting) {                    return;                }                // 调整视图位置                initBmpPosition();            }                    /**             * 初始化图片位置             */            private void initBmpPosition() {                isIniting = true;                super.setScaleType(ScaleType.MATRIX);                Drawable drawable = getDrawable();                        if(drawable == null) {                    return;                }                        final float viewWidth = getWidth();                final float viewHeight = getHeight();                final int drawableWidth = drawable.getIntrinsicWidth();                final int drawableHeight = drawable.getIntrinsicHeight();                if(viewWidth < viewHeight) {                    borderlength = (int) (viewWidth - 2 * BORDERDISTANCE);                } else {                    borderlength = (int) (viewHeight - 2 * BORDERDISTANCE);                }                        float screenScale = 1f;                // 小于屏幕的图片会被撑满屏幕                if(drawableWidth <= drawableHeight) {// 竖图片                    screenScale = (float) borderlength / drawableWidth;                } else {// 横图片                    screenScale = (float) borderlength / drawableHeight;                }                        defaultMatrix.setScale(screenScale, screenScale);                        if(drawableWidth <= drawableHeight) {// 竖图片                    float heightOffset = (viewHeight - drawableHeight * screenScale) / 2.0f;                    if(viewWidth <= viewHeight) {// 竖照片竖屏幕                        defaultMatrix.postTranslate(BORDERDISTANCE, heightOffset);                    } else {// 竖照片横屏幕                        defaultMatrix.postTranslate((viewWidth - borderlength) / 2.0f, heightOffset);                    }                } else {                    float widthOffset = (viewWidth - drawableWidth * screenScale) / 2.0f;                    if(viewWidth <= viewHeight) {// 横照片,竖屏幕                        defaultMatrix.postTranslate(widthOffset, (viewHeight - borderlength) / 2.0f);                    } else {// 横照片,横屏幕                        defaultMatrix.postTranslate(widthOffset, BORDERDISTANCE);                    }                }                        resetMatrix();            }                    /**             * Resets the Matrix back to FIT_CENTER, and then displays it.s             */            private void resetMatrix() {                if(dragMatrix == null) {                    return;                }                        dragMatrix.reset();                setImageMatrix(getDisplayMatrix());            }                    private Matrix getDisplayMatrix() {                finalMatrix.set(defaultMatrix);                finalMatrix.postConcat(dragMatrix);                return finalMatrix;            }                    @Override            public boolean onTouch(View view, MotionEvent motionEvent) {                return multiGestureDetector.onTouchEvent(motionEvent);            }                    private class MultiGestureDetector extends GestureDetector.SimpleOnGestureListener implements                    ScaleGestureDetector.OnScaleGestureListener {                        private final ScaleGestureDetector scaleGestureDetector;                private final GestureDetector gestureDetector;                private final float scaledTouchSlop;                        private VelocityTracker velocityTracker;                private boolean isDragging;                        private float lastTouchX;                private float lastTouchY;                private float lastPointerCount;// 上一次是几个手指事件                        public MultiGestureDetector(Context context) {                    scaleGestureDetector = new ScaleGestureDetector(context, this);                    gestureDetector = new GestureDetector(context, this);                    gestureDetector.setOnDoubleTapListener(this);                            final ViewConfiguration configuration = ViewConfiguration.get(context);                    scaledTouchSlop = configuration.getScaledTouchSlop();                }                        @Override                public boolean onScale(ScaleGestureDetector scaleGestureDetector) {                    float scale = getScale();                    float scaleFactor = scaleGestureDetector.getScaleFactor();                    if(getDrawable() != null && ((scale < maxScale && scaleFactor > 1.0f) || (scale > minScale && scaleFactor < 1.0f))){                        if(scaleFactor * scale < minScale){                            scaleFactor = minScale / scale;                        }                        if(scaleFactor * scale > maxScale){                            scaleFactor = maxScale / scale;                        }                        dragMatrix.postScale(scaleFactor, scaleFactor, getWidth() / 2, getHeight() / 2);                        checkAndDisplayMatrix();                    }                    return true;                }                        @Override                public boolean onScaleBegin(ScaleGestureDetector scaleGestureDetector) {                    return true;                }                        @Override                public void onScaleEnd(ScaleGestureDetector scaleGestureDetector) {}                        public boolean onTouchEvent(MotionEvent event) {                    if (gestureDetector.onTouchEvent(event)) {                        return true;                    }                            scaleGestureDetector.onTouchEvent(event);                            /*                     * Get the center x, y of all the pointers                     */                    float x = 0, y = 0;                    final int pointerCount = event.getPointerCount();                    for (int i = 0; i < pointerCount; i++) {                        x += event.getX(i);                        y += event.getY(i);                    }                    x = x / pointerCount;                    y = y / pointerCount;                            /*                     * If the pointer count has changed cancel the drag                     */                    if (pointerCount != lastPointerCount) {                        isDragging = false;                        if (velocityTracker != null) {                            velocityTracker.clear();                        }                        lastTouchX = x;                        lastTouchY = y;                        lastPointerCount = pointerCount;                    }                            switch (event.getAction()) {                        case MotionEvent.ACTION_DOWN:                            if (velocityTracker == null) {                                velocityTracker = VelocityTracker.obtain();                            } else {                                velocityTracker.clear();                            }                            velocityTracker.addMovement(event);                                    lastTouchX = x;                            lastTouchY = y;                            isDragging = false;                            break;                        case MotionEvent.ACTION_UP:                        case MotionEvent.ACTION_CANCEL:                            lastPointerCount = 0;                            if (velocityTracker != null) {                                velocityTracker.recycle();                                velocityTracker = null;                            }                            break;                        case MotionEvent.ACTION_MOVE: {                            final float dx = x - lastTouchX, dy = y - lastTouchY;                                    if (isDragging == false) {                                // Use Pythagoras to see if drag length is larger than                                // touch slop                                isDragging = Math.sqrt((dx * dx) + (dy * dy)) >= scaledTouchSlop;                            }                                    if (isDragging) {                                if (getDrawable() != null) {                                    dragMatrix.postTranslate(dx, dy);                                    checkAndDisplayMatrix();                                }                                        lastTouchX = x;                                lastTouchY = y;                                        if (velocityTracker != null) {                                    velocityTracker.addMovement(event);                                }                            }                            break;                        }                    }                            return true;                }                        @Override                public boolean onDoubleTap(MotionEvent event) {                    try {                        float scale = getScale();                        float x = getWidth() / 2;                        float y = getHeight() / 2;                                if (scale < midScale) {                            post(new AnimatedZoomRunnable(scale, midScale, x, y));                        } else if ((scale >= midScale) && (scale < maxScale)) {                            post(new AnimatedZoomRunnable(scale, maxScale, x, y));                        } else {// 双击缩小小于最小值                            post(new AnimatedZoomRunnable(scale, minScale, x, y));                        }                    } catch (Exception e) {                        // Can sometimes happen when getX() and getY() is called                    }                            return true;                }            }                    private class AnimatedZoomRunnable implements Runnable {                // These are 'postScale' values, means they're compounded each iteration                static final float ANIMATION_SCALE_PER_ITERATION_IN = 1.07f;                static final float ANIMATION_SCALE_PER_ITERATION_OUT = 0.93f;                        private final float focalX, focalY;                private final float targetZoom;                private final float deltaScale;                        public AnimatedZoomRunnable(final float currentZoom, final float targetZoom,                                            final float focalX, final float focalY) {                    this.targetZoom = targetZoom;                    this.focalX = focalX;                    this.focalY = focalY;                            if (currentZoom < targetZoom) {                        deltaScale = ANIMATION_SCALE_PER_ITERATION_IN;                    } else {                        deltaScale = ANIMATION_SCALE_PER_ITERATION_OUT;                    }                }                        @Override                public void run() {                    dragMatrix.postScale(deltaScale, deltaScale, focalX, focalY);                    checkAndDisplayMatrix();                            final float currentScale = getScale();                            if (((deltaScale > 1f) && (currentScale < targetZoom))                            || ((deltaScale < 1f) && (targetZoom < currentScale))) {                        // We haven't hit our target scale yet, so post ourselves                        // again                        postOnAnimation(ClipSquareImageView.this, this);                            } else {                        // We've scaled past our target zoom, so calculate the                        // necessary scale so we're back at target zoom                        final float delta = targetZoom / currentScale;                        dragMatrix.postScale(delta, delta, focalX, focalY);                        checkAndDisplayMatrix();                    }                }            }                    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)            private void postOnAnimation(View view, Runnable runnable) {                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {                    view.postOnAnimation(runnable);                } else {                    view.postDelayed(runnable, 16);                }            }                    /**             * Returns the current scale value             *             * @return float - current scale value             */            public final float getScale() {                dragMatrix.getValues(matrixValues);                return matrixValues[Matrix.MSCALE_X];            }                    /**             * Helper method that simply checks the Matrix, and then displays the result             */            private void checkAndDisplayMatrix() {                checkMatrixBounds();                setImageMatrix(getDisplayMatrix());            }                    private void checkMatrixBounds() {                final RectF rect = getDisplayRect(getDisplayMatrix());                if (null == rect) {                    return;                }                        float deltaX = 0, deltaY = 0;                final float viewWidth = getWidth();                final float viewHeight = getHeight();                // 判断移动或缩放后,图片显示是否超出裁剪框边界                final float heightBorder = (viewHeight - borderlength) / 2;                final float weightBorder = (viewWidth - borderlength) / 2;                if(rect.top > heightBorder){                    deltaY = heightBorder - rect.top;                }                if(rect.bottom < (viewHeight - heightBorder)){                    deltaY = viewHeight - heightBorder - rect.bottom;                }                if(rect.left > weightBorder){                    deltaX = weightBorder - rect.left;                }                if(rect.right < viewWidth - weightBorder){                    deltaX = viewWidth - weightBorder - rect.right;                }                // Finally actually translate the matrix                dragMatrix.postTranslate(deltaX, deltaY);                            }                    /**             * 获取图片相对Matrix的距离             *             * @param matrix             *            - Matrix to map Drawable against             * @return RectF - Displayed Rectangle             */            private RectF getDisplayRect(Matrix matrix) {                Drawable d = getDrawable();                if (null != d) {                    displayRect.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());                    matrix.mapRect(displayRect);                    return displayRect;                }                        return null;            }                    /**             * 剪切图片,返回剪切后的bitmap对象             *             * @return             */            public Bitmap clip(){                Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);                Canvas canvas = new Canvas(bitmap);                draw(canvas);                return Bitmap.createBitmap(bitmap, (getWidth() - borderlength) / 2, (getHeight() - borderlength) / 2, borderlength, borderlength);            }        }  

代码下载:https://github.com/h3clikejava/AndroidClipSquare