团队博客
自定义裁剪
package com.spring.sky.image.upload; import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Rect; import android.graphics.Region; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; /** * Created by Administrator on 2017/9/22. */ public class CropImageView extends View { // 在touch重要用到的点， private float mX_1 = 0; private float mY_1 = 0; // 触摸事件判断 private final int STATUS_SINGLE = 1; private final int STATUS_MULTI_START = 2; private final int STATUS_MULTI_TOUCHING = 3; // 当前状态 private int mStatus = STATUS_SINGLE; // 默认裁剪的宽高 private int cropWidth; private int cropHeight; // 浮层Drawable的四个点 private final int EDGE_LT = 1; private final int EDGE_RT = 2; private final int EDGE_LB = 3; private final int EDGE_RB = 4; private final int EDGE_MOVE_IN = 5; private final int EDGE_MOVE_OUT = 6; private final int EDGE_NONE = 7; public int currentEdge = EDGE_NONE; protected float oriRationWH = 0; protected final float maxZoomOut = 5.0f; protected final float minZoomIn = 0.333333f; protected Drawable mDrawable; protected FloatDrawable mFloatDrawable; protected Rect mDrawableSrc = new Rect();// 图片Rect变换时的Rect protected Rect mDrawableDst = new Rect();// 图片Rect protected Rect mDrawableFloat = new Rect();// 浮层的Rect protected boolean isFrist = true; private boolean isTouchInSquare = true; protected Context mContext; public CropImageView(Context context) { super(context); init(context); } public CropImageView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public CropImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context); } @SuppressLint("NewApi") private void init(Context context) { this.mContext = context; try { if (android.os.Build.VERSION.SDK_INT >= 11) { this.setLayerType(LAYER_TYPE_SOFTWARE, null); } } catch (Exception e) { e.printStackTrace(); } mFloatDrawable = new FloatDrawable(context); } public void setDrawable(Drawable mDrawable, int cropWidth, int cropHeight) { this.mDrawable = mDrawable; this.cropWidth = cropWidth; this.cropHeight = cropHeight; this.isFrist = true; invalidate(); } @SuppressLint("ClickableViewAccessibility") @Override public boolean onTouchEvent(MotionEvent event) { if (event.getPointerCount() > 1) { if (mStatus == STATUS_SINGLE) { mStatus = STATUS_MULTI_START; } else if (mStatus == STATUS_MULTI_START) { mStatus = STATUS_MULTI_TOUCHING; } } else { if (mStatus == STATUS_MULTI_START || mStatus == STATUS_MULTI_TOUCHING) { mX_1 = event.getX(); mY_1 = event.getY(); } mStatus = STATUS_SINGLE; } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mX_1 = event.getX(); mY_1 = event.getY(); currentEdge = getTouch((int) mX_1, (int) mY_1); isTouchInSquare = mDrawableFloat.contains((int) event.getX(), (int) event.getY()); break; case MotionEvent.ACTION_UP: checkBounds(); break; case MotionEvent.ACTION_POINTER_UP: currentEdge = EDGE_NONE; break; case MotionEvent.ACTION_MOVE: if (mStatus == STATUS_MULTI_TOUCHING) { } else if (mStatus == STATUS_SINGLE) { int dx = (int) (event.getX() - mX_1); int dy = (int) (event.getY() - mY_1); mX_1 = event.getX(); mY_1 = event.getY(); // 根據得到的那一个角，并且变换Rect if (!(dx == 0 && dy == 0)) { switch (currentEdge) { case EDGE_LT: mDrawableFloat.set(mDrawableFloat.left + dx, mDrawableFloat.top + dy, mDrawableFloat.right, mDrawableFloat.bottom); break; case EDGE_RT: mDrawableFloat.set(mDrawableFloat.left, mDrawableFloat.top + dy, mDrawableFloat.right + dx, mDrawableFloat.bottom); break; case EDGE_LB: mDrawableFloat.set(mDrawableFloat.left + dx, mDrawableFloat.top, mDrawableFloat.right, mDrawableFloat.bottom + dy); break; case EDGE_RB: mDrawableFloat.set(mDrawableFloat.left, mDrawableFloat.top, mDrawableFloat.right + dx, mDrawableFloat.bottom + dy); break; case EDGE_MOVE_IN: if (isTouchInSquare) { mDrawableFloat.offset((int) dx, (int) dy); } break; case EDGE_MOVE_OUT: break; } mDrawableFloat.sort(); invalidate(); } } break; } return true; } // 根据初触摸点判断是触摸的Rect哪一个角 public int getTouch(int eventX, int eventY) { if (mFloatDrawable.getBounds().left <= eventX && eventX < (mFloatDrawable.getBounds().left + mFloatDrawable .getBorderWidth()) && mFloatDrawable.getBounds().top <= eventY && eventY < (mFloatDrawable.getBounds().top + mFloatDrawable .getBorderHeight())) { return EDGE_LT; } else if ((mFloatDrawable.getBounds().right - mFloatDrawable .getBorderWidth()) <= eventX && eventX < mFloatDrawable.getBounds().right && mFloatDrawable.getBounds().top <= eventY && eventY < (mFloatDrawable.getBounds().top + mFloatDrawable .getBorderHeight())) { return EDGE_RT; } else if (mFloatDrawable.getBounds().left <= eventX && eventX < (mFloatDrawable.getBounds().left + mFloatDrawable .getBorderWidth()) && (mFloatDrawable.getBounds().bottom - mFloatDrawable .getBorderHeight()) <= eventY && eventY < mFloatDrawable.getBounds().bottom) { return EDGE_LB; } else if ((mFloatDrawable.getBounds().right - mFloatDrawable .getBorderWidth()) <= eventX && eventX < mFloatDrawable.getBounds().right && (mFloatDrawable.getBounds().bottom - mFloatDrawable .getBorderHeight()) <= eventY && eventY < mFloatDrawable.getBounds().bottom) { return EDGE_RB; } else if (mFloatDrawable.getBounds().contains(eventX, eventY)) { return EDGE_MOVE_IN; } return EDGE_MOVE_OUT; } @Override protected void onDraw(Canvas canvas) { if (mDrawable == null) { return; } if (mDrawable.getIntrinsicWidth() == 0 || mDrawable.getIntrinsicHeight() == 0) { return; } configureBounds(); // 在画布上花图片 mDrawable.draw(canvas); canvas.save(); // 在画布上画浮层FloatDrawable,Region.Op.DIFFERENCE是表示Rect交集的补集 canvas.clipRect(mDrawableFloat, Region.Op.DIFFERENCE); // 在交集的补集上画上灰色用来区分 canvas.drawColor(Color.parseColor("#a0000000")); canvas.restore(); // 画浮层 mFloatDrawable.draw(canvas); } protected void configureBounds() { // configureBounds在onDraw方法中调用 // isFirst的目的是下面对mDrawableSrc和mDrawableFloat只初始化一次， // 之后的变化是根据touch事件来变化的，而不是每次执行重新对mDrawableSrc和mDrawableFloat进行设置 if (isFrist) { oriRationWH = ((float) mDrawable.getIntrinsicWidth()) / ((float) mDrawable.getIntrinsicHeight()); final float scale = mContext.getResources().getDisplayMetrics().density; int w = Math.min(getWidth(), (int) (mDrawable.getIntrinsicWidth() * scale + 0.5f)); int h = (int) (w / oriRationWH); int left = (getWidth() - w) / 2; int top = (getHeight() - h) / 2; int right = left + w; int bottom = top + h; mDrawableSrc.set(left, top, right, bottom); mDrawableDst.set(mDrawableSrc); int floatWidth = dipTopx(mContext, cropWidth); int floatHeight = dipTopx(mContext, cropHeight); if (floatWidth > getWidth()) { floatWidth = getWidth(); floatHeight = cropHeight * floatWidth / cropWidth; } if (floatHeight > getHeight()) { floatHeight = getHeight(); floatWidth = cropWidth * floatHeight / cropHeight; } int floatLeft = (getWidth() - floatWidth) / 2; int floatTop = (getHeight() - floatHeight) / 2; mDrawableFloat.set(floatLeft, floatTop, floatLeft + floatWidth, floatTop + floatHeight); isFrist = false; } mDrawable.setBounds(mDrawableDst); mFloatDrawable.setBounds(mDrawableFloat); } // 在up事件中调用了该方法，目的是检查是否把浮层拖出了屏幕 protected void checkBounds() { int newLeft = mDrawableFloat.left; int newTop = mDrawableFloat.top; boolean isChange = false; if (mDrawableFloat.left < getLeft()) { newLeft = getLeft(); isChange = true; } if (mDrawableFloat.top < getTop()) { newTop = getTop(); isChange = true; } if (mDrawableFloat.right > getRight()) { newLeft = getRight() - mDrawableFloat.width(); isChange = true; } if (mDrawableFloat.bottom > getBottom()) { newTop = getBottom() - mDrawableFloat.height(); isChange = true; } mDrawableFloat.offsetTo(newLeft, newTop); if (isChange) { invalidate(); } } // 进行图片的裁剪，所谓的裁剪就是根据Drawable的新的坐标在画布上创建一张新的图片 public Bitmap getCropImage() { Bitmap tmpBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.RGB_565); Canvas canvas = new Canvas(tmpBitmap); mDrawable.draw(canvas); Matrix matrix = new Matrix(); float scale = (float) (mDrawableSrc.width()) / (float) (mDrawableDst.width()); matrix.postScale(scale, scale); Bitmap ret = Bitmap.createBitmap(tmpBitmap, mDrawableFloat.left, mDrawableFloat.top, mDrawableFloat.width(), mDrawableFloat.height(), matrix, true); tmpBitmap.recycle(); tmpBitmap = null; return ret; } public int dipTopx(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } }
