android中选择控件与选择界面自然过度效果的实现

package com.mikadev.test; import android.animation.ValueAnimator; import android.graphics.Rect; import android.view.View; import android.view.ViewGroup; import android.view.animation.DecelerateInterpolator; import java.util.ArrayList; import java.util.List; public class CustomAnimator extends ValueAnimator implements ValueAnimator.AnimatorUpdateListener { private final Rect mTmpRect; private boolean mIsRevert; private ViewGroup mMainContainer; private View mFocusedView; private View mFocusedViewContainer; private List<View> mFadedOutToBottomViews, mSlideToTop; private View mStickyTo; private ViewGroup mEditModeViewGroup; private int mEditModeHalfHeight; private final int ANIMATION_DURATION = 300; public CustomAnimator() { super(); mTmpRect = new Rect(); mIsRevert = false; mFadedOutToBottomViews = new ArrayList<View>(); mSlideToTop = new ArrayList<View>(); setInterpolator(new DecelerateInterpolator()); setDuration(ANIMATION_DURATION); addUpdateListener(this); } public void setAnimatorViews(ViewGroup mainContainer, View focusedView, View focusedViewContainer, List<View> fadedOutToBottomViews, View stickyTo, ViewGroup editModeView, List<View> slideToTop) { if (mainContainer == null) throw new NullPointerException(); if (focusedView == null) throw new NullPointerException(); if (focusedViewContainer == null) throw new NullPointerException(); if (editModeView == null) throw new NullPointerException(); mMainContainer = mainContainer; mFocusedView = focusedView; mFocusedViewContainer = focusedViewContainer; mFadedOutToBottomViews.clear(); if (fadedOutToBottomViews != null) mFadedOutToBottomViews.addAll(fadedOutToBottomViews); mStickyTo = stickyTo; mEditModeViewGroup = editModeView; mSlideToTop.clear(); if (slideToTop != null) mSlideToTop.addAll(slideToTop); removeAllListeners(); addListener(new LayerEnablingAnimatorListener(focusedView)); for (View v : mFadedOutToBottomViews) addListener(new LayerEnablingAnimatorListener(v)); for (View v : mSlideToTop) addListener(new LayerEnablingAnimatorListener(v)); addListener(new LayerEnablingAnimatorListener(editModeView)); } public void setEditModeHalfHeight(int editModeHalfHeight) { mEditModeHalfHeight = editModeHalfHeight; } private Positions getPositionsStart() { // focusOn float focusY = mFocusedViewContainer.getY(); // slideToTop float[] slideToTopY = new float[mSlideToTop.size()]; for (int i = 0; i < mSlideToTop.size(); i++) { slideToTopY[i] = mSlideToTop.get(i).getY(); } // fadeToBottom float[] nextContainersY = new float[mFadedOutToBottomViews.size()]; for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { nextContainersY[i] = mFadedOutToBottomViews.get(i).getY(); } float nextContainersAlpha = 1; // stickyTo float stickToY = mStickyTo == null ? 0 : mStickyTo.getY(); // fadeInToTop float editY = mEditModeViewGroup.getY(); float editAlpha = 0f; return new Positions(focusY, nextContainersY, nextContainersAlpha, stickToY, editY, editAlpha, slideToTopY); } private Positions getPositionsEnd() { // focusOn mFocusedView.getDrawingRect(mTmpRect); mMainContainer.offsetDescendantRectToMyCoords(mFocusedView, mTmpRect); float focusY = mFocusedViewContainer.getY() - mTmpRect.top; // slideToTop float[] slideToTopY = new float[mSlideToTop.size()]; for (int i = 0; i < mSlideToTop.size(); i++) { slideToTopY[i] = mSlideToTop.get(i).getY() - mTmpRect.top; } // fadeToBottom float[] nextContainersY = new float[mFadedOutToBottomViews.size()]; for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { nextContainersY[i] = mFadedOutToBottomViews.get(i).getY() + mEditModeHalfHeight; } float nextContainersAlpha = 0; // stickyTo float stickToY = 0; if (mStickyTo != null) { mStickyTo.getDrawingRect(mTmpRect); mMainContainer.offsetDescendantRectToMyCoords(mStickyTo, mTmpRect); stickToY = mStickyTo.getY() + (mStickyTo.getHeight() - mTmpRect.top); } // fadeInToTop float editY = 0; float editAlpha = 1f; return new Positions(focusY, nextContainersY, nextContainersAlpha, stickToY, editY, editAlpha, slideToTopY); } public void prepareAnimation() { mIsRevert = false; setObjectValues(getPositionsStart(), getPositionsEnd()); setEvaluator(new PositionTypeEvaluator()); } private Positions getRevertPositionsStart() { // focusOn float focusY = mFocusedViewContainer.getY(); // slideToTop float[] slideToTopY = new float[mSlideToTop.size()]; for (int i = 0; i < mSlideToTop.size(); i++) { slideToTopY[i] = mSlideToTop.get(i).getY(); } // fadeToBottom float[] nextContainersY = new float[mFadedOutToBottomViews.size()]; for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { nextContainersY[i] = mFadedOutToBottomViews.get(i).getY(); } float nextContainersAlpha = 0; // stickyTo float stickToY = mStickyTo == null ? 0 : mStickyTo.getY(); // fadeInToTop float editY = mEditModeViewGroup.getY(); float editAlpha = 1f; return new Positions(focusY, nextContainersY, nextContainersAlpha, stickToY, editY, editAlpha, slideToTopY); } private Positions getRevertPositionsEnd() { // focusOn mFocusedView.getDrawingRect(mTmpRect); mMainContainer.offsetDescendantRectToMyCoords(mFocusedView, mTmpRect); float focusY = mFocusedViewContainer.getY() + mTmpRect.top; // slideToTop float[] slideToTopY = new float[mSlideToTop.size()]; for (int i = 0; i < mSlideToTop.size(); i++) { slideToTopY[i] = mSlideToTop.get(i).getY() + mTmpRect.top; } // fadeToBottom float[] nextContainersY = new float[mFadedOutToBottomViews.size()]; for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { nextContainersY[i] = mFadedOutToBottomViews.get(i).getY() - mEditModeHalfHeight; } float nextContainersAlpha = 1; // stickyTo float stickToY = 0; if (mStickyTo != null) { mStickyTo.getDrawingRect(mTmpRect); mMainContainer.offsetDescendantRectToMyCoords(mStickyTo, mTmpRect); stickToY = mStickyTo.getY() - (mStickyTo.getHeight() - mTmpRect.top); } // fadeInToTop float editY = mEditModeHalfHeight; float editAlpha = 0f; return new Positions(focusY, nextContainersY, nextContainersAlpha, stickToY, editY, editAlpha, slideToTopY); } public void prepareRevert() { mIsRevert = true; setObjectValues(getRevertPositionsStart(), getRevertPositionsEnd()); setEvaluator(new PositionTypeEvaluator()); } @Override public void onAnimationUpdate(ValueAnimator animation) { Positions currentPos = (Positions) animation.getAnimatedValue(); if (!mIsRevert) { for (int i = 0; i < mSlideToTop.size(); i++) { mSlideToTop.get(i).setY(currentPos.getSlideToTop()[i]); } mFocusedViewContainer.setY(currentPos.getFocusY()); for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { mFadedOutToBottomViews.get(i).setY(currentPos.getNextContainersY()[i]); mFadedOutToBottomViews.get(i).setAlpha(currentPos.getNextContainersAlpha()); } if (mStickyTo != null) mStickyTo.setY(currentPos.getStickToY()); mEditModeViewGroup.setY(currentPos.getEditY()); mEditModeViewGroup.setAlpha(currentPos.getEditAlpha()); mEditModeViewGroup.setVisibility(View.VISIBLE); } else { mEditModeViewGroup.setY(currentPos.getEditY()); mEditModeViewGroup.setAlpha(currentPos.getEditAlpha()); if (mStickyTo != null) mStickyTo.setY(currentPos.getStickToY()); for (int i = 0; i < mFadedOutToBottomViews.size(); i++) { mFadedOutToBottomViews.get(i).setY(currentPos.getNextContainersY()[i]); mFadedOutToBottomViews.get(i).setAlpha(currentPos.getNextContainersAlpha()); } mFocusedViewContainer.setY(currentPos.getFocusY()); for (int i = 0; i < mSlideToTop.size(); i++) { mSlideToTop.get(i).setY(currentPos.getSlideToTop()[i]); } } } }