AndroidClipSquare安卓实现方形头像裁剪

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

 

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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);     } }

 

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