在android應(yīng)用中怎么添加一個上拉刷新下拉加載功能？針對這個問題，這篇文章詳細介紹了相對應(yīng)的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
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下拉刷新
首先我們給出如下幾個參數(shù)，后面要用：
private NestedScrollingParentHelper helper = null; private boolean IsRefresh = true; private boolean IsLoad = true; //滑動的總距離 private int totalY = 0; private LinearLayout headerLayout = null; private MyRecyclerView myRecyclerView = null; private LinearLayout footerLayout = null;
既然是刷新，我們的滾動肯定是在父view之前的。所以我們需要在onNestedPreScroll這個方法里面寫上我們所需要改動的x，y值。
我們需要用父view去攔截它。
我們需要判斷dy的值是否大于0，因為大于0是刷新操作，小于0是加載操作。然后我們需要判斷recyclerview是否是縱向的而不是橫向的。
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重慶分公司
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
if (IsRefresh) {
if (dy > 0) {
if (myRecyclerView.isOrientation(0)) {
totalY += dy;
if ((totalY / 2) <= 0) {
scrollTo(0, totalY / 2);
consumed[1] = dy;
} else {
scrollTo(0, 0);
consumed[1] = 0;
}
}
return;
}
}上拉加載
上面我也說了onNestedPreScroll這個方法中判斷dy<0才是加載操作。所以綜上所述，代碼變成了這樣：
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
if (totalY < 0 && myRecyclerView.isOrientation(0) || totalY > 0 && myRecyclerView.isOrientation(1)) {
isfling = true;
}
if (IsRefresh) {
if (dy > 0) {
if (myRecyclerView.isOrientation(0)) {
totalY += dy;
if ((totalY / 2) <= 0) {
scrollTo(0, totalY / 2);
consumed[1] = dy;
} else {
scrollTo(0, 0);
consumed[1] = 0;
}
}
return;
}
}
if (IsLoad) {
if (dy < 0) {
if (myRecyclerView.isOrientation(1)) {
totalY += dy;
if ((totalY / 2) >= 0) {
scrollTo(0, totalY / 2);
consumed[1] = dy;
} else {
scrollTo(0, 0);
consumed[1] = 0;
}
}
return;
}
}
}最后我們需要在子view滑動結(jié)束后，實行如下操作：
//子view滑動結(jié)束調(diào)用
//dyUnconsumed < 0 向下滾
//dyUnconsumed > 0 向上滾
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
if (dyUnconsumed != 0) {
totalY += dyUnconsumed;
scrollTo(0, totalY / 2);
}
}其實最主要的兩個方法已經(jīng)解決了，其他到?jīng)]什么了，這邊，我把nestedscrolling的8個接口的功能和自定義recyclerview放出來。已變大家參考。希望大家都能實現(xiàn)自己的刷新加載。告別swiperefreshlayout。
添加header和footer
這里我們參考listview自帶的addheaderview和addfooterview。代碼如下：
public void addHeaderView(View headerView, int headerHeight) {
this.headerLayout.removeAllViews();
this.headerLayout.addView(headerView);
LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, headerHeight);
layoutParams.topMargin = -headerHeight;
this.headerLayout.setLayoutParams(layoutParams);
}
public void addFooterView(View footerView, int footerHeight) {
this.footerLayout.removeAllViews();
this.footerLayout.addView(footerView);
this.footerLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, footerHeight));
}幾個接口的實現(xiàn)
public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
return true;
}
public void onNestedScrollAccepted(View child, View target, int axes) {
helper.onNestedScrollAccepted(child, target, axes);
}
//父view攔截子view的滾動
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
if (totalY < 0 && myRecyclerView.isOrientation(0) || totalY > 0 && myRecyclerView.isOrientation(1)) {
isfling = true;
}
if (IsRefresh) {
if (dy > 0) {
if (myRecyclerView.isOrientation(0)) {
totalY += dy;
if ((totalY / 2) <= 0) {
scrollTo(0, totalY / 2);
consumed[1] = dy;
} else {
scrollTo(0, 0);
consumed[1] = 0;
}
}
return;
}
}
if (IsLoad) {
if (dy < 0) {
if (myRecyclerView.isOrientation(1)) {
totalY += dy;
if ((totalY / 2) >= 0) {
scrollTo(0, totalY / 2);
consumed[1] = dy;
} else {
scrollTo(0, 0);
consumed[1] = 0;
}
}
return;
}
}
}
//子view滑動結(jié)束調(diào)用
//dyUnconsumed < 0 向下滾
//dyUnconsumed > 0 向上滾
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
if (dyUnconsumed != 0) {
totalY += dyUnconsumed;
scrollTo(0, totalY / 2);
}
}
public void onStopNestedScroll(View child) {
helper.onStopNestedScroll(child);
if (onTouchUpListener != null) {
isfling = false;
onTouchUpListener.touchUp();
}
}
public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
return isfling;
}
public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
return isfling;
}
public int getNestedScrollAxes() {
return helper.getNestedScrollAxes();
}自定義recyclerview
既然是自己寫的刷新加載框架，總不能還有自定義layout中在放個recyclerview。多麻煩，自定義一個，直接放在里面，然后分別放個header和footer 就沒必要每次有頁面用到刷新都要寫一個布局。3個布局解決整個項目的刷新和加載。話不多說，代碼如下：
private class MyRecyclerView extends RecyclerView {
private StaggeredGridLayoutManager staggeredGridLayoutManager = null;
private LinearLayoutManager linearLayoutManager = null;
private GridLayoutManager gridLayoutManager = null;
private boolean isScrollLoad = false;
private boolean isScrollRefresh = false;
public MyRecyclerView(Context context) {
super(context);
setVerticalFadingEdgeEnabled(false);
setHorizontalFadingEdgeEnabled(false);
setVerticalScrollBarEnabled(false);
setHorizontalScrollBarEnabled(false);
setOverScrollMode(OVER_SCROLL_NEVER);
setItemAnimator(new DefaultItemAnimator());
}
private void setMyLayoutManager(LayoutManager layoutManager) {
if (layoutManager instanceof StaggeredGridLayoutManager) {
staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
} else if (layoutManager instanceof GridLayoutManager) {
gridLayoutManager = (GridLayoutManager) layoutManager;
} else if (layoutManager instanceof LinearLayoutManager) {
linearLayoutManager = (LinearLayoutManager) layoutManager;
}
setLayoutManager(layoutManager);
if (!isVertical()) {
throw new NullPointerException("vertical!");
}
}
private boolean isOrientation(int orientation) {//orientation,0代表向下，1代表向上
if (orientation == 0)
return isCanPullDown();
else if (orientation == 1)
return isCanPullUp();
return false;
}
private boolean isCanPullDown() {
return !canScrollVertically(-1);
}
private boolean isCanPullUp() {
return !canScrollVertically(1);
}
// private int scrollLoad() {
// int lastItem = 0;
// int itemCount = 0;
// int spanCount = 1;
// if (staggeredGridLayoutManager != null) {
// lastItem = staggeredGridLayoutManager.findLastVisibleItemPositions(null)[0];
// itemCount = staggeredGridLayoutManager.getItemCount();
// spanCount = staggeredGridLayoutManager.getSpanCount();
// } else if (linearLayoutManager != null) {
// lastItem = linearLayoutManager.findLastVisibleItemPosition();
// itemCount = linearLayoutManager.getItemCount();
// spanCount = 1;
// } else if (gridLayoutManager != null) {
// lastItem = gridLayoutManager.findLastVisibleItemPosition();
// itemCount = gridLayoutManager.getItemCount();
// spanCount = gridLayoutManager.getSpanCount();
// }
// return ((itemCount - 1) / spanCount + 1) - (lastItem / spanCount + 1);
// }
private boolean isVertical() {
if (staggeredGridLayoutManager != null)
return staggeredGridLayoutManager.getOrientation() == StaggeredGridLayoutManager.VERTICAL;
else if (linearLayoutManager != null)
return linearLayoutManager.getOrientation() == LinearLayoutManager.VERTICAL;
else if (gridLayoutManager != null)
return gridLayoutManager.getOrientation() == GridLayoutManager.VERTICAL;
return false;
}
// public void onScrolled(int dx, int dy) {
// if (dy > 0 && !isScrollLoad) {
// if (oLior != null) {
// onScrollListener.scrollLoad(sc````````
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llLoad());//傳遞滾動到倒數(shù)第幾行
// }
// }
// }
}關(guān)于在android應(yīng)用中怎么添加一個上拉刷新下拉加載功能問題的解答就分享到這里了，希望以上內(nèi)容可以對大家有一定的幫助，如果你還有很多疑惑沒有解開，可以關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道了解更多相關(guān)知識。
