这节,就一个任务如何把上节自定义的翻页动画控件整进下拉列表中去。
由于是自定义的下拉列表控件,我们需要自定义能够上啦下滑的listview,这势必会造成这个问题,上拉刷新要响应相应touch事件,拖拽也似乎也要相应触摸事件,这势必会造成了一种事件的冲突了,怎么解决了。我这里用一个变量来区分一下,伪代码如下:
前面说了,这么多了,我们直接点评代码把:
package com.routemap_infomation.utils; import java.util.Date; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewDebug.IntToString; import android.view.ViewGroup; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import com.routemap_infomation.myfocus.R; import com.routemap_infomation.myfocus.LineFocusActivity.RouteItem; import com.routemap_infomation.utils.GestureJudgeUtils.OnGestureResult; /** * 该类主要是完成 头部部分的功能封装 * * 一个可以监听ListView是否滚动到最顶部或最底部的自定义控件 * 只能监听由触摸产生的,如果是ListView本身Flying导致的,则不能监听</br> 如果加以改进,可以实现监听scroll滚动的具体位置等 * * @author 进 */ public class ScrollOverListView extends ListView implements OnScrollListener { public static boolean canRefleash = true; private static final String TAG = "listview"; /**松开更新**/ private static final int RELEASE_TO_REFRESH = 0; /**下拉更新**/ private static final int PULL_TO_REFRESH = 1; /**更新中**/ private static final int REFRESHING = 2; /**无**/ private static final int DONE = 3; /**加载中**/ private static final int LOADING = 4; /**实际的padding的距离与界面上偏移距离的比例**/ private static final int RATIO = 3; /**是否要使用下拉刷新功能**/ public boolean showRefresh = true; public boolean isDelete; public void setIsDelete(boolean isDelete){ this.isDelete = isDelete; } private int mLastY; private int mBottomPosition; private SlideView mFocusedItemView; private LayoutInflater inflater; /**头部刷新的布局**/ private LinearLayout headView; /**头部显示下拉刷新等的控件**/ private TextView tipsTextview; /**刷新控件**/ private TextView lastUpdatedTextView; /**箭头图标**/ private ImageView arrowImageView; /**头部滚动条**/ private ProgressBar progressBar; /**显示动画**/ private RotateAnimation animation; /**头部回退显示动画**/ private RotateAnimation reverseAnimation; /** 用于保证startY的值在一个完整的touch事件中只被记录一次**/ private boolean isRecored; /**头部高度**/ private int headContentHeight; /**开始的Y坐标**/ private int startY; /**第一个item**/ private int firstItemIndex; /**状态**/ private int state; private boolean isBack; private GestureDetector gestureDetector; /** 空的 */ private OnScrollOverListener mOnScrollOverListener = new OnScrollOverListener() { @Override public boolean onListViewTopAndPullDown(int delta) { return false; } @Override public boolean onListViewBottomAndPullUp(int delta) { return false; } @Override public boolean onMotionDown(MotionEvent ev) { return false; } @Override public boolean onMotionMove(MotionEvent ev, int delta) { return false; } @Override public boolean onMotionUp(MotionEvent ev) { return false; } }; public ScrollOverListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context); } public ScrollOverListView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public ScrollOverListView(Context context, PullDownView pullDownView) { super(context); isDelete = pullDownView.getIsDelete(); init(context); } /**出事化控件**/ private void init(Context context) { mBottomPosition = 0; setCacheColorHint(0); inflater = LayoutInflater.from(context); headView = (LinearLayout) inflater.inflate(R.layout.pull_down_head, null); arrowImageView = (ImageView) headView .findViewById(R.id.head_arrowImageView); arrowImageView.setMinimumWidth(70); arrowImageView.setMinimumHeight(50); progressBar = (ProgressBar) headView .findViewById(R.id.head_progressBar); tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView); lastUpdatedTextView = (TextView) headView .findViewById(R.id.head_lastUpdatedTextView); measureView(headView); headContentHeight = headView.getMeasuredHeight(); headView.setPadding(0, -1 * headContentHeight, 0, 0); headView.invalidate(); /**列表添加头部**/ addHeaderView(headView, null, false); setOnScrollListener(this); animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); animation.setInterpolator(new LinearInterpolator()); animation.setDuration(250); animation.setFillAfter(true); reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); reverseAnimation.setInterpolator(new LinearInterpolator()); reverseAnimation.setDuration(200); reverseAnimation.setFillAfter(true); state = DONE; gestureDetector=new GestureJudgeUtils(PublicDefine.context,new GestureJudgeUtils.OnGestureResult() { @Override public void onGestureResult(int direction) { // TODO Auto-generated method stub switch (direction) { case GestureJudgeUtils.GESTURE_LEFT: case GestureJudgeUtils.GESTURE_RIGHT: PublicDefine.isDeleteTag=true; break; case GestureJudgeUtils.GESTURE_DOWN: case GestureJudgeUtils.GESTURE_UP: PublicDefine.isDeleteTag=false; default: break; } } }).Buile(); } int currentx=0; int currenty=0; /**触摸事件的处理**/ @Override public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getAction(); final int y = (int) ev.getRawY(); final int deltax=(int)ev.getRawX(); if (action==MotionEvent.ACTION_DOWN&&PublicDefine.isDeleteTag) { mFocusedItemView.move(); PublicDefine.isDeleteTag=false; return super.onTouchEvent(ev); } if (action==MotionEvent.ACTION_DOWN) { currentx=(int) ev.getRawX(); currenty=(int) ev.getRawY(); } PublicDefine.isDeleteTag=Horizontal(currentx,currenty,deltax,y); cancelLongPress(); if(PublicDefine.isDeleteTag){ switch (action) { case MotionEvent.ACTION_DOWN: { int x = (int) ev.getX(); int z = (int) ev.getY(); int position = pointToPosition(x, z); Log.e(TAG, "postion=" + position); if (position != INVALID_POSITION) { RouteItem data = (RouteItem) getItemAtPosition(position); mFocusedItemView = data.slideView; Log.e(TAG, "FocusedItemView=" + mFocusedItemView); } } default: break; } if (mFocusedItemView != null) { return mFocusedItemView.onRequireTouchEvent(ev); } return super.onTouchEvent(ev); }else{ switch (action) { case MotionEvent.ACTION_DOWN: //按下的时候 if (firstItemIndex == 0 && !isRecored) { isRecored = true; startY = (int) ev.getY(); Log.v(TAG, "在down时候记录当前位置‘"); } // =========================== mLastY = y; final boolean isHandled = mOnScrollOverListener.onMotionDown(ev); if (isHandled) { mLastY = y; return isHandled; } break; case MotionEvent.ACTION_MOVE: //手指正在移动的时候 int tempY = (int) ev.getY(); if (showRefresh) { if (!isRecored && firstItemIndex == 0) { Log.v(TAG, "在move时候记录下位置"); isRecored = true; startY = tempY; } if (state != REFRESHING && isRecored && state != LOADING) { // 保证在设置padding的过程中,当前的位置一直是在head,否则如果当列表超出屏幕的话,当在上推的时候,列表会同时进行滚动 // 可以松手去刷新了 if (state == RELEASE_TO_REFRESH) { setSelection(0); // 往上推了,推到了屏幕足够掩盖head的程度,但是还没有推到全部掩盖的地步 if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) { state = PULL_TO_REFRESH; changeHeaderViewByState(); }else if (tempY - startY <= 0) {// 一下子推到顶了 state = DONE; changeHeaderViewByState(); Log.v(TAG, "由松开刷新状态转变到done状态"); } // else {// 往下拉了,或者还没有上推到屏幕顶部掩盖head的地步 // // 不用进行特别的操作,只用更新paddingTop的值就行了 // } } // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态 if (state == PULL_TO_REFRESH) { setSelection(0); // 下拉到可以进入RELEASE_TO_REFRESH的状态 if ((tempY - startY) / RATIO >= headContentHeight) { state = RELEASE_TO_REFRESH; isBack = true; changeHeaderViewByState(); Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新"); }else if (tempY - startY <= 0) { // 上推到顶了 state = DONE; changeHeaderViewByState(); Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态"); } } // done状态下 if (state == DONE) { if (tempY - startY > 0) { state = PULL_TO_REFRESH; changeHeaderViewByState(); } } // 更新headView的size if (state == PULL_TO_REFRESH) { headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0); } // 更新headView的paddingTop if (state == RELEASE_TO_REFRESH) { headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0); } } } // ============================================== final int childCount = getChildCount(); if (childCount == 0){ return super.onTouchEvent(ev); } final int itemCount = getAdapter().getCount() - mBottomPosition; final int deltaY = y - mLastY; final int lastBottom = getChildAt(childCount - 1).getBottom(); final int end = getHeight() - getPaddingBottom(); final int firstVisiblePosition = getFirstVisiblePosition(); final boolean isHandleMotionMove = mOnScrollOverListener .onMotionMove(ev, deltaY); if (isHandleMotionMove) { mLastY = y; return true; } /** 到达底部 * 到达底部的事件在另外一个类执行**/ if (firstVisiblePosition + childCount >= itemCount && lastBottom <= end && deltaY < 0) { final boolean isHandleOnListViewBottomAndPullDown; isHandleOnListViewBottomAndPullDown = mOnScrollOverListener .onListViewBottomAndPullUp(deltaY); if (isHandleOnListViewBottomAndPullDown) { mLastY = y; return true; } } break; case MotionEvent.ACTION_UP: //手指抬起来的时候 if (state != REFRESHING && state != LOADING) { // if (state == DONE) { // // 什么都不做 // } if (state == PULL_TO_REFRESH) { state = DONE; changeHeaderViewByState(); Log.v(TAG, "由下拉刷新状态,到done状态"); } if (state == RELEASE_TO_REFRESH) { state = REFRESHING; changeHeaderViewByState(); canRefleash = true; Log.v(TAG, "由松开刷新状态,到done状态"); } } isRecored = false; isBack = false; // /====================== final boolean isHandlerMotionUp = mOnScrollOverListener .onMotionUp(ev); if (isHandlerMotionUp) { mLastY = y; return true; } break; default: break; } mLastY = y; return super.onTouchEvent(ev); } // }catch(Exception e){ // Log.i("test", e.getMessage()); // return true; // // } } private boolean Horizontal(int dx, int dy,int dx1,int dy1) { // TODO Auto-generated method stub int deltax=dx-dx1; int deltay=dy-dy1; if (Math.abs(deltax)>=Math.abs(deltay)) { return true; }else { return false; } } // =============================== public method /** * 可以自定义其中一个条目为头部,头部触发的事件将以这个为准,默认为第一个 * * @param index 正数第几个,必须在条目数范围之内 */ public void setTopPosition(int index) { if (getAdapter() == null){ throw new NullPointerException( "You must set adapter before setTopPosition!"); } if (index < 0){ throw new IllegalArgumentException("Top position must > 0"); } } /** * 可以自定义其中一个条目为尾部,尾部触发的事件将以这个为准,默认为最后一个 * * @param index 倒数第几个,必须在条目数范围之内 */ public void setBottomPosition(int index) { if (getAdapter() == null){ throw new NullPointerException( "You must set adapter before setBottonPosition!"); } if (index < 0){ throw new IllegalArgumentException("Bottom position must > 0"); } mBottomPosition = index; } /** * 设置这个Listener可以监听是否到达顶端,或者是否到达低端等事件</br> * * @see OnScrollOverListener */ public void setOnScrollOverListener( OnScrollOverListener onScrollOverListener) { mOnScrollOverListener = onScrollOverListener; } /** * 滚动监听接口 * * @see ScrollOverListView#setOnScrollOverListener(OnScrollOverListener) * */ public interface OnScrollOverListener { /** * 到达最顶部触发 * * @param delta * 手指点击移动产生的偏移量 * @return */ boolean onListViewTopAndPullDown(int delta); /** * 到达最底部触发 * * @param delta * 手指点击移动产生的偏移量 * @return */ boolean onListViewBottomAndPullUp(int delta); /** * 手指触摸按下触发,相当于{@link MotionEvent#ACTION_DOWN} * * @return 返回true表示自己处理 * @see View#onTouchEvent(MotionEvent) */ boolean onMotionDown(MotionEvent ev); /** * 手指触摸移动触发,相当于{@link MotionEvent#ACTION_MOVE} * * @return 返回true表示自己处理 * @see View#onTouchEvent(MotionEvent) */ boolean onMotionMove(MotionEvent ev, int delta); /** * 手指触摸后提起触发,相当于{@link MotionEvent#ACTION_UP} * * @return 返回true表示自己处理 * @see View#onTouchEvent(MotionEvent) */ boolean onMotionUp(MotionEvent ev); } @Override public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2, int arg3) { firstItemIndex = firstVisiableItem; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } // 此方法直接照搬自网络上的一个下拉刷新的demo,此处是“估计”headView的width以及height private void measureView(View child) { ViewGroup.LayoutParams p = child.getLayoutParams(); if (p == null) { p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); } int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width); int lpHeight = p.height; int childHeightSpec; if (lpHeight > 0) { childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); } else { childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); } child.measure(childWidthSpec, childHeightSpec); } public void onRefreshComplete() { state = DONE; lastUpdatedTextView.setText("最近更新:" + new Date().toLocaleString()); changeHeaderViewByState(); } // 当状态改变时候,调用该方法,以更新界面 private void changeHeaderViewByState() { switch (state) { case RELEASE_TO_REFRESH: arrowImageView.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.startAnimation(animation); tipsTextview.setText("松开刷新"); Log.v(TAG, "当前状态,松开刷新"); break; case PULL_TO_REFRESH: progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.setVisibility(View.VISIBLE); // 是由RELEASE_To_REFRESH状态转变来的 if (isBack) { isBack = false; arrowImageView.clearAnimation(); arrowImageView.startAnimation(reverseAnimation); tipsTextview.setText("下拉刷新"); } else { tipsTextview.setText("下拉刷新"); } Log.v(TAG, "当前状态,下拉刷新"); break; case REFRESHING: headView.setPadding(0, 0, 0, 0); progressBar.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.setVisibility(View.GONE); tipsTextview.setText("正在刷新..."); lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态,正在刷新..."); break; case DONE: headView.setPadding(0, -1 * headContentHeight, 0, 0); progressBar.setVisibility(View.GONE); arrowImageView.clearAnimation(); arrowImageView.setImageResource(R.drawable.pull_down_arrow); tipsTextview.setText("下拉刷新"); lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态,done"); break; default: break; } } public void shrinkListItem(int position) { View item = getChildAt(position); if (item != null) { try { ((SlideView) item).shrink(); } catch (ClassCastException e) { e.printStackTrace(); } } } }
①由于这个类继承与listview,因此具有了listview常见属性与方法。
②由于他要记录上拉下拉刷新的方式,因此,我们这里需要用定义一些变量来保存,并且要记录他们的状态。
③上拉刷新的状态是需要监听的了,怎么进行监听了,这里依照java中插件机制,依照相应的观察者(observer)模式,需要定义一个接口来监听了。
④为了实现动态,这里需要定义不同参数的构造函数了。
⑤这里是一个重点,我们定义了一个变量,接上面的论证,我们这里定义了一个变量来确定到底是调用那个触摸方法。
⑥一般在android中,init初始化,找到相应控件,数据加载,是一个司空见惯的方法,在这里了,我们还对相应的手势的方法进行了监听,但是后来发现在此情景下,主要是由于touch事件中,无法对手势进行监听。
⑦onTouchEvent事件,触摸事件,是这一切事件的重中之重,我这里首先要对其手势方向进行了监听,上文提到无法直接对手势的方向进行监听了,因此我这里粗略进行进行了判断,判断触摸按下与触摸抬起的时候,两点x轴之间的距离与两点y之间的距离孰大孰小。来判断他是竖向滚动,还是横向拖拽。倘若是横向的拖拽,进把触摸事件下放到slideview控件,由她将触摸事件进行处理,否则的话,就由此控件监听上拉下滑的刷新事件。
⑧与上节一样,对其滑动以后,也要对其控件的距离,控件位置进行调整,进行计算。
⑨这个控件本质是个列表控件,本质是对数据进行处理,因此,我们这里需要一个方法对其数据加以处理的。
以上的内容就把slideview整合到项目中去了,其最终的效果是这样的:
以上代码下载地址: