Android高仿微信头像裁切 package com.zhy.view; import andro

文件名称: Android高仿微信头像裁切

所属分类: Android

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文件大小: 6mb

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上传时间: 2015-11-13

提供者: sinat_3*******

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详细说明： Android高仿微信头像裁切 package com.zhy.view; 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.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.GestureDetector.SimpleOnGestureListener; import android.view.MotionEvent; import android.view.ScaleGestureDetector; import android.view.ScaleGestureDetector.OnScaleGestureListen er; import android.view.View; import android.view.View.OnTouchListener; import android.view.ViewTreeObserver; import android.widget.ImageView; /** * http://blog.csdn.net/lmj623565791/article/details/39761281 * * @author zhy * */ public class ClipZoomImageView extends ImageView implements OnScaleGestureListener, OnTouchListener, ViewTreeObserver.OnGlobalLayoutListener { private static final String TAG = ClipZoomImageView.class.getSimpleName(); public static float SCALE_MAX = 4.0f; private static float SCALE_MID = 2.0f; /** * 初始化时的缩放比例，如果图片宽或高大于屏幕，此值将小于0 */ private float initScale = 1.0f; private boolean once = true; /** * 用于存放矩阵的9个值 */ private final float[] matrixValues = new float[9]; /** * 缩放的手势检测 */ private ScaleGestureDetector mScaleGestureDetector = null; private final Matrix mScaleMatrix = new Matrix(); /** * 用于双击检测 */ private GestureDetector mGestureDetector; private boolean isAutoScale; private int mTouchSlop; private float mLastX; private float mLastY; private boolean isCanDrag; private int lastPointerCount; public ClipZoomImageView(Context context) { this(context, null); } public ClipZoomImageView(Context context, AttributeSet attrs) { super(context, attrs); setScaleType(ScaleType.MATRIX); mGestureDetector = new GestureDetector(context, new SimpleOnGestureListener() { @Override public boolean onDoubleTap(MotionEvent e) { if (isAutoScale == true) return true; float x = e.getX(); float y = e.getY(); if (getScale() < SCALE_MID) { ClipZoomImageView.this.postDelayed( new AutoScaleRunnable(SCALE_MID, x, y), 16); isAutoScale = true; } else { ClipZoomImageView.this.postDelayed( new AutoScaleRunnable(initScale, x, y), 16); isAutoScale = true; } return true; } }); mScaleGestureDetector = new ScaleGestureDetector(context, this); this.setOnTouchListener(this); } /** * 自动缩放的任务 * * @author zhy * */ private class AutoScaleRunnable implements Runnable { static final float BIGGER = 1.07f; static final float SMALLER = 0.93f; private float mTargetScale; private float tmpScale; /** * 缩放的中心 */ private float x; private float y; /** * 传入目标缩放值，根据目标值与当前值，判断应该放大还是缩小 * * @param targetScale */ public AutoScaleRunnable(float targetScale, float x, float y) { this.mTargetScale = targetScale; this.x = x; this.y = y; if (getScale() < mTargetScale) { tmpScale = BIGGER; } else { tmpScale = SMALLER; } } @Override public void run() { // 进行缩放 mScaleMatrix.postScale(tmpScale, tmpScale, x, y); checkBorder(); setImageMatrix(mScaleMatrix); final float currentScale = getScale(); // 如果值在合法范围内，继续缩放 if (((tmpScale > 1f) && (currentScale < mTargetScale)) || ((tmpScale < 1f) && (mTargetScale < currentScale))) { ClipZoomImageView.this.postDelayed(this, 16); } else // 设置为目标的缩放比例 { final float deltaScale = mTargetScale / currentScale; mScaleMatrix.postScale(deltaScale, deltaScale, x, y); checkBorder(); setImageMatrix(mScaleMatrix); isAutoScale = false; } } } @Override public boolean onScale(ScaleGestureDetector detector) { float scale = getScale(); float scaleFactor = detector.getScaleFactor(); if (getDrawable() == null) return true; /** * 缩放的范围控制 */ if ((scale < SCALE_MAX && scaleFactor > 1.0f) || (scale > initScale && scaleFactor < 1.0f)) { /** * 最大值最小值判断 */ if (scaleFactor * scale < initScale) { scaleFactor = initScale / scale; } if (scaleFactor * scale > SCALE_MAX) { scaleFactor = SCALE_MAX / scale; } /** * 设置缩放比例 */ mScaleMatrix.postScale(scaleFactor, scaleFactor, detector.getFocusX(), detector.getFocusY()); checkBorder(); setImageMatrix(mScaleMatrix); } return true; } /** * 根据当前图片的Matrix获得图片的范围 * * @return */ private RectF getMatrixRectF() { Matrix matrix = mScaleMatrix; RectF rect = new RectF(); Drawable d = getDrawable(); if (null != d) { rect.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight()); matrix.mapRect(rect); } return rect; } @Override public boolean onScaleBegin(ScaleGestureDetector detector) { return true; } @Override public void onScaleEnd(ScaleGestureDetector detector) { } @Override public boolean onTouch(View v, MotionEvent event) { if (mGestureDetector.onTouchEvent(event)) return true; mScaleGestureDetector.onTouchEvent(event); float x = 0, y = 0; // 拿到触摸点的个数 final int pointerCount = event.getPointerCount(); // 得到多个触摸点的x与y均值 for (int i = 0; i < pointerCount; i++) { x += event.getX(i); y += event.getY(i); } x = x / pointerCount; y = y / pointerCount; /** * 每当触摸点发生变化时，重置mLasX , mLastY */ if (pointerCount != lastPointerCount) { isCanDrag = false; mLastX = x; mLastY = y; } lastPointerCount = pointerCount; switch (event.getAction()) { case MotionEvent.ACTION_MOVE: float dx = x - mLastX; float dy = y - mLastY; if (!isCanDrag) { isCanDrag = isCanDrag(dx, dy); } if (isCanDrag) { if (getDrawable() != null) { RectF rectF = getMatrixRectF(); // 如果宽度小于屏幕宽度，则禁止左右移动 if (rectF.width() <= getWidth() - mHorizontalPadding * 2) { dx = 0; } // 如果高度小雨屏幕高度，则禁止上下移动 if (rectF.height() <= getHeight() - mVerticalPadding * 2) { dy = 0; } mScaleMatrix.postTranslate(dx, dy); checkBorder(); setImageMatrix(mScaleMatrix); } } mLastX = x; mLastY = y; break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: lastPointerCount = 0; break; } return true; } /** * 获得当前的缩放比例 * * @return */ public final float getScale() { mScaleMatrix.getValues(matrixValues); return matrixValues[Matrix.MSCALE_X]; } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); getViewTreeObserver().addOnGlobalLayoutListener(this); } @SuppressWarnings("deprecation") @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); getViewTreeObserver().removeGlobalOnLayoutListener(this); } /** * 水平方向与View的边距 */ private int mHorizontalPadding; /** * 垂直方向与View的边距 */ private int mVerticalPadding; @Override public void onGlobalLayout() { if (once) { Drawable d = getDrawable(); if (d == null) return; // 垂直方向的边距 mVerticalPadding = (getHeight() - (getWidth() - 2 * mHorizontalPadding)) / 2; int width = getWidth(); int height = getHeight(); // 拿到图片的宽和高 int dw = d.getIntrinsicWidth(); int dh = d.getIntrinsicHeight(); float scale = 1.0f; if (dw < getWidth() - mHorizontalPadding * 2 && dh > getHeight() - mVerticalPadding * 2) { scale = (getWidth() * 1.0f - mHorizontalPadding * 2) / dw; } if (dh < getHeight() - mVerticalPadding * 2 && dw > getWidth() - mHorizontalPadding * 2) { scale = (getHeight() * 1.0f - mVerticalPadding * 2) / dh; } if (dw < getWidth() - mHorizontalPadding * 2 && dh < getHeight() - mVerticalPadding * 2) { float scaleW = (getWidth() * 1.0f - mHorizontalPadding * 2) / dw; float scaleH = (getHeight() * 1.0f - mVerticalPadding * 2) / dh; scale = Math.max(scaleW, scaleH); } initScale = scale; SCALE_MID = initScale * 2; SCALE_MAX = initScale * 4; mScaleMatrix.postTranslate((width - dw) / 2, (height - dh) / 2); mScaleMatrix.postScale(scale, scale, getWidth() / 2, getHeight() / 2); // 图片移动至屏幕中心 setImageMatrix(mScaleMatrix); once = false; } } /** * 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, mHorizontalPadding, mVerticalPadding, getWidth() - 2 * mHorizontalPadding, getWidth() - 2 * mHorizontalPadding); } /** * 边界检测 */ private void checkBorder() { RectF rect = getMatrixRectF(); float deltaX = 0; float deltaY = 0; int width = getWidth(); int height = getHeight(); Log.e(TAG, "rect.width() = " + rect.width() + " , width - 2 * mHorizontalPadding =" + (width - 2 * mHorizontalPadding)); // 如果宽或高大于屏幕，则控制范围 ; 这里的0.001是因为精度丢失会产生问题，但是误差一般很小，所以我们直接加了一个0.01 if (rect.width() + 0.01 >= width - 2 * mHorizontalPadding) { if (rect.left > mHorizontalPadding) { deltaX = -rect.left + mHorizontalPadding; } if (rect.right < width - mHorizontalPadding) { deltaX = width - mHorizontalPadding - rect.right; } } if (rect.height() + 0.01 >= height - 2 * mVerticalPadding) { if (rect.top > mVerticalPadding) { deltaY = -rect.top + mVerticalPadding; } if (rect.bottom < height - mVerticalPadding) { deltaY = height - mVerticalPadding - rect.bottom; } } mScaleMatrix.postTranslate(deltaX, deltaY); } /** * 是否是拖动行为 * * @param dx * @param dy * @return */ private boolean isCanDrag(float dx, float dy) { return Math.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop; } public void setHorizontalPadding(int mHorizontalPadding) { this.mHorizontalPadding = mHorizontalPadding; } } ...展开收缩

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