android 日历动画的实现

华为P8日历的截图

目前仅实现动画，内容没有填充，效果如下图

布局分析

承载日历网格的是一个ViewPager，每天的日历活动是一个ListView，需要实现的效果是，在listview区域向上滑动，viewpager也跟着滑动，滑动后viewpaer只留下一行，listview滑动到这一行的下面。

难点在于拦截listview的滑动事件。

实现分析

使用CalendarContainer（继承自FrameLayout）作为ViewPager和listView的父空间，在CalendarContainer的onInterceptTouchEvent中判断拦截listview的滑动事件，并处理滑动动画。

CalendarContainer类文件;

package com.example.test;import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.AnimatorSet;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.FrameLayout;/*** @author whuthm* @date 2015-6-12*/
public class CalendarContainer extends FrameLayout {/** 停止滚动 */public static final int SCROLL_STATE_IDLE = 0;/** 手指在屏幕上正在滚动 */public static final int SCROLL_STATE_TOUCH_SCROLL = 1;/** 手指离开屏幕滚动 */public static final int SCROLL_STATE_FLING = 2;private int mScrollState = SCROLL_STATE_IDLE;private VelocityTracker mVelocityTracker;private CalendarListView mListView;private CalendarViewPager mViewPager;private int mRowHeight = 150;private int mRowCount = 5;private int mSelecteRow = 2;private float mLastMotionY;private boolean mIsOnSlidablyArea = false;private int mTouchSlop;/** view是否展开 */private boolean mExpanded = true;public CalendarContainer(Context context) {this(context, null);}public CalendarContainer(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CalendarContainer(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);final ViewConfiguration configuration = ViewConfiguration.get(getContext());mTouchSlop = configuration.getScaledTouchSlop();mViewPager = new CalendarViewPager(context, attrs);// mViewPager.setBackgroundColor(Color.GREEN);mViewPager.setBackgroundResource(R.drawable.ic_launcher);LayoutParams pagerLp = new LayoutParams(0, 0);pagerLp.x = 0;pagerLp.y = 0;addView(mViewPager, pagerLp);mListView = new CalendarListView(context, attrs, defStyle);mListView.setBackgroundColor(Color.BLUE);LayoutParams listLp = new LayoutParams(0, 0);listLp.x = 0;listLp.y = mRowCount * mRowHeight;addView(mListView, listLp);}private void acquireVelocityTrackerAndAddMovement(MotionEvent ev) {if (mVelocityTracker == null) {mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(ev);}private void releaseVelocityTracker() {if (mVelocityTracker != null) {mVelocityTracker.recycle();mVelocityTracker = null;}}protected void determineScrollingStart(MotionEvent ev) {final float y = ev.getY();final float deltaY = y - mLastMotionY;final int yDiff = (int) Math.abs(deltaY);boolean xScrolled = yDiff >= mTouchSlop;if (xScrolled&& ((deltaY < 0 && mExpanded) || (deltaY > 0 && !mExpanded))) {mScrollState = SCROLL_STATE_TOUCH_SCROLL;mLastMotionY = y;}}/** 滑动动画结束时，属性改变*/private void end() {mExpanded = !mExpanded;mScrollState = SCROLL_STATE_IDLE;}/** 取消后，直接重置*/private void cancel() {mScrollState = SCROLL_STATE_IDLE;LayoutParams listLp = (LayoutParams) mListView.getLayoutParams();listLp.y = mExpanded ? mRowCount * mRowHeight : mRowHeight;LayoutParams pagerLp = (LayoutParams) mViewPager.getLayoutParams();pagerLp.y = mExpanded ? 0 : -mSelecteRow * mRowHeight;requestLayout();}/** 跟随手指滑动动画*/private void move(int distance) {boolean needRequesLayout = false;LayoutParams listLp = (LayoutParams) mListView.getLayoutParams();final int listTop = mRowHeight;final int listBottom = mRowCount * mRowHeight;int listTargetY = listLp.y + distance;if (listTargetY >= listTop && listTargetY <= listBottom) {listLp.y = listTargetY;listLp.x = 0;needRequesLayout = true;}LayoutParams pagerLp = (LayoutParams) mViewPager.getLayoutParams();final int pagerTop = -mSelecteRow * mRowHeight;final int pagerBottom = 0;int pagerTargetY = pagerLp.y + distance;if (pagerTargetY >= pagerTop && pagerTargetY <= pagerBottom) {pagerLp.y = pagerTargetY;pagerLp.x = 0;needRequesLayout = true;}if (needRequesLayout) {requestLayout();}}/** 手指松开后，滑动动画，目前只支持属性动画*/@SuppressLint("NewApi")private void fling() {mScrollState = SCROLL_STATE_FLING;final LayoutParams listLp = (LayoutParams) mListView.getLayoutParams();final int listTop = mRowHeight;final int listBottom = mRowCount * mRowHeight;if (listLp.y > listTop && listLp.y < listBottom) {final LayoutParams pagerLp = (LayoutParams) mViewPager.getLayoutParams();final int pagerTop = -mSelecteRow * mRowHeight;final int pagerBottom = 0;int listTargetY = mExpanded ? listTop : listBottom;int pagerTargetY = mExpanded ? pagerTop : pagerBottom;ValueAnimator listAnimator = ValueAnimator.ofInt(listLp.y,listTargetY);listAnimator.addUpdateListener(new AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animator) {listLp.y = (Integer) animator.getAnimatedValue();requestLayout();}});ValueAnimator pagerAnimator = ValueAnimator.ofInt(pagerLp.y,pagerTargetY);pagerAnimator.addUpdateListener(new AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animator) {pagerLp.y = (Integer) animator.getAnimatedValue();requestLayout();}});AnimatorSet set = new AnimatorSet();set.playTogether(listAnimator, pagerAnimator);set.addListener(new AnimatorListener() {@Overridepublic void onAnimationStart(Animator animator) {}@Overridepublic void onAnimationRepeat(Animator animator) {}@Overridepublic void onAnimationEnd(Animator animator) {end();}@Overridepublic void onAnimationCancel(Animator animator) {cancel();}});set.setDuration(400);set.start();} else {end();}}//处理滑动动画@SuppressLint("ClickableViewAccessibility")@Overridepublic boolean onTouchEvent(MotionEvent ev) {Log.e("whuthm2222", "onTouchEvent action = " + ev.getAction());if (mScrollState == SCROLL_STATE_FLING) {return true;}if (getChildCount() <= 0) {mScrollState = SCROLL_STATE_IDLE;return super.onTouchEvent(ev);}acquireVelocityTrackerAndAddMovement(ev);final int action = ev.getAction();final float y = ev.getY();switch (action) {case MotionEvent.ACTION_DOWN:mLastMotionY = y;break;case MotionEvent.ACTION_MOVE:if (mScrollState == SCROLL_STATE_TOUCH_SCROLL) {float deltaY = y - mLastMotionY;if (Math.abs(deltaY) >= 1.0f) {move((int) deltaY);mLastMotionY = y;}}break;case MotionEvent.ACTION_UP:if (mScrollState == SCROLL_STATE_TOUCH_SCROLL) {fling();}releaseVelocityTracker();break;case MotionEvent.ACTION_CANCEL:cancel();releaseVelocityTracker();break;}return true;}/** 拦截listview的滑动事件*/@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {Log.e("whuthm", "onInterceptTouchEvent action = " + ev.getAction()+ "  " + mScrollState);//当在滑动中时，直接拦截if (mScrollState == SCROLL_STATE_TOUCH_SCROLL|| mScrollState == SCROLL_STATE_FLING) {return true;}if (getChildCount() <= 0) {return super.onInterceptTouchEvent(ev);}//当listview的第一项不可见时不拦截if (!mListView.isTop()) {return super.onInterceptTouchEvent(ev);}acquireVelocityTrackerAndAddMovement(ev);final int action = ev.getAction();final float x = ev.getX();final float y = ev.getY();//当滑动区域不在listview中时，不 拦截if (action != MotionEvent.ACTION_DOWN && !mIsOnSlidablyArea) {return super.onInterceptTouchEvent(ev);}switch (action) {case MotionEvent.ACTION_DOWN:mIsOnSlidablyArea = isOnSlidablyArea(x, y);mScrollState = SCROLL_STATE_IDLE;mLastMotionY = y;break;case MotionEvent.ACTION_MOVE:determineScrollingStart(ev);break;case MotionEvent.ACTION_UP:end();releaseVelocityTracker();break;case MotionEvent.ACTION_CANCEL:cancel();releaseVelocityTracker();break;}return mScrollState == SCROLL_STATE_TOUCH_SCROLL|| mScrollState == SCROLL_STATE_FLING;}/** 计算可滑动区域，list在父控件中的可见区域 */private boolean isOnSlidablyArea(float x, float y) {int left = Math.max(0, mListView.getLeft());int top = Math.max(0, mListView.getTop());int right = Math.min(getWidth(), mListView.getRight());int bottom = Math.min(getHeight(), mListView.getBottom());return x >= left && x <= right && y >= top && y <= bottom;}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// super.onMeasure(widthMeasureSpec, heightMeasureSpec);int widthSize = MeasureSpec.getSize(widthMeasureSpec);int heightSize = MeasureSpec.getSize(heightMeasureSpec);if (mListView.getVisibility() != View.GONE) {LayoutParams listLp = (LayoutParams) mListView.getLayoutParams();listLp.width = widthSize;listLp.height = heightSize - mRowHeight;mListView.measure(MeasureSpec.makeMeasureSpec(listLp.width,MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(listLp.height, MeasureSpec.EXACTLY));}if (mViewPager.getVisibility() != View.GONE) {LayoutParams pagerLp = (LayoutParams) mViewPager.getLayoutParams();pagerLp.width = widthSize;pagerLp.height = mRowHeight * mRowCount;mViewPager.measure(MeasureSpec.makeMeasureSpec(pagerLp.width,MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(pagerLp.height, MeasureSpec.EXACTLY));}setMeasuredDimension(widthSize, heightSize);}@Overrideprotected void onLayout(boolean changed, int left, int top, int right,int bottom) {// super.onLayout(changed, left, top, right, bottom);if (mListView.getVisibility() != View.GONE) {LayoutParams listLp = (LayoutParams) mListView.getLayoutParams();mListView.layout(listLp.x, listLp.y, listLp.x + listLp.width,listLp.y + listLp.height);}if (mViewPager.getVisibility() != View.GONE) {LayoutParams pagerLp = (LayoutParams) mViewPager.getLayoutParams();mViewPager.layout(pagerLp.x, pagerLp.y, pagerLp.x + pagerLp.width,pagerLp.y + pagerLp.height);}}class LayoutParams extends FrameLayout.LayoutParams {int x;int y;public LayoutParams(int width, int height) {super(width, height);}}}

CalendarListView类文件

package com.example.test;import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;/*** @author whuthm* @date 2015-6-12*/
public class CalendarListView extends ListView {public CalendarListView(Context context) {super(context);}public CalendarListView(Context context, AttributeSet attrs) {super(context, attrs);}public CalendarListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);setAdapter(new SimpleAdapter());}/** 判断第一项是否可见*/boolean isTop() {return getFirstVisiblePosition() == 0;}class SimpleAdapter extends BaseAdapter {String[] datas;public SimpleAdapter() {datas = new String[100];for (int i = 0; i < 100; i++) {datas[i] = "test " + i;}}@Overridepublic int getCount() {return datas.length;}@Overridepublic Object getItem(int position) {return datas[position];}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (convertView == null) {convertView = new TextView(getContext());}((TextView) convertView).setText(datas[position]);return convertView;}}}

数据为填充，后续完善。

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