android九宫格可分页加载控件使用详解

2023-08-02 03:51:05 75

本文实例为大家分享了android九宫格可分页加载控件的具体实现代码，供大家参考，具体内容如下

github地址

基本思路是viewpager+gridview,每一页viewpager视图有一个gridview,gridview加载九格。所以要保证数据的准确性。数据以List>的形式。控件实现了高度自适应，根据控件的个数，计算控件的高度。内部的viewpager和gridview视图都以动态创建，无需新建一个xml文件，整个控件只需要一个item的布局文件。

使用方法

使用时可以先请求一个接口，需初始化数据，数据初始化需要根据总个数初始化所有数据，在每次分页加载的时候，再通过请求当页的数据，更改数据，刷新页面。

viewPager=findViewById(R.id.ninePages);
//数据初始化
List>lists=newArrayList<>();
for(inti=0;i<6;i++){//页数
Listlist1=newArrayList<>();
for(intj=0;j<9;j++){//每页个数
TestEntityentity=newTestEntity();
entity.setText("j="+j+"/i="+i);
list1.add(entity);
}
lists.add(list1);
}
//设置不每页重复加载
viewPager.setEveryRequest(false);
//设置分页加载
viewPager.setPagingLoad(true);
viewPager.setListener(newRequestDataListener(){
@Override
publicvoidrequest(intposition){//分页加载
ListchangeList=newArrayList<>();
for(inti=0;i<9;i++){
TestEntitytestEntity=newTestEntity();
testEntity.setText("change"+i);
changeList.add(testEntity);
}
//数据刷新
viewPager.dataInvalidate(position,changeList);
}

@Override
publicintgridViewColumn(){//gridview列数
return3;
}

@Override
publicViewgetView(LayoutInflaterinflater,intposition,ViewconvertView,ViewGroupparent,Listlist){
ViewHolderviewHolder=null;
if(convertView==null){
convertView=inflater.inflate(R.layout.item_gridview,parent,false);
viewHolder=newViewHolder();
viewHolder.textView=convertView.findViewById(R.id.textview);
convertView.setTag(viewHolder);
}else{
viewHolder=(ViewHolder)convertView.getTag();
}
viewHolder.textView.setText(list.get(position).getText());
returnconvertView;
}
});
viewPager.setList(lists);
classViewHolder{
privateTextViewtextView;
}

注意：viewPager.setList(lists);要在最后调用

视图控件：

publicclassNinePagesPaginationextendsLinearLayout{
privateViewmView;
privateViewPagerviewPager;
privateContextcontext;
privateList>list=newArrayList<>();
//已经请求过的，不在重复请求
privateListhasAdded=newArrayList<>();
//是否每次请求
privatebooleanisEveryRequest;
//是否进行分页加载
privatebooleanisPagingLoad;
privateRequestDataListenerlistener;
privateMyViewPagerAdapteradapter;
privateViewPager.OnPageChangeListenerpageChangeListener;
publicNinePagesPagination(Contextcontext,@NullableAttributeSetattrs){
super(context,attrs);
this.context=context;
viewPager=newViewPager(context);
LayoutParamsparams=newLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
viewPager.setLayoutParams(params);
mView=viewPager;
addView(mView);
}

@Override
protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
if(listener!=null&&listener.gridViewColumn()!=0){
intcolumn=listener.gridViewColumn();
introw=(int)Math.ceil((double)list.get(0).size()/column);
intheightMeasureSpec2=MeasureSpec.makeMeasureSpec(row*getWidth()/column,
MeasureSpec.AT_MOST);
setMeasuredDimension(widthMeasureSpec,heightMeasureSpec2);
}
}

publicvoidsetListener(RequestDataListenerlistener){
this.listener=listener;
}

publicvoidsetPageChangeListener(ViewPager.OnPageChangeListenerpageChangeListener){
this.pageChangeListener=pageChangeListener;
}

publicvoidsetEveryRequest(booleaneveryRequest){
isEveryRequest=everyRequest;
}

publicvoidsetPagingLoad(booleanpagingLoad){
isPagingLoad=pagingLoad;
}

publicvoidsetList(List>list){
this.list=list;
initView();
invalidate();
}

privatevoidinitView(){
adapter=newMyViewPagerAdapter(context,list,listener);
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(newViewPager.OnPageChangeListener(){
@Override
publicvoidonPageScrolled(intposition,floatpositionOffset,intpositionOffsetPixels){
if(pageChangeListener!=null){
pageChangeListener.onPageScrolled(position,positionOffset,positionOffsetPixels);
}
}

@Override
publicvoidonPageSelected(intposition){
if(pageChangeListener!=null){
pageChangeListener.onPageSelected(position);
}
if(isPagingLoad){//分页加载
if(isEveryRequest){//每次都请求
adapter.setCurrentPosition(position);
listener.request(position);
}else{//请求过一次将不在重复请求
if(!hasAdded.contains(position)){
hasAdded.add(position);
adapter.setCurrentPosition(position);
listener.request(position);
}
}
}
}


@Override
publicvoidonPageScrollStateChanged(intstate){
if(pageChangeListener!=null){
pageChangeListener.onPageScrollStateChanged(state);
}
}
});
}
//数据刷新
publicvoiddataInvalidate(intposition,ListchangeList){
list.set(position,changeList);
adapter.notifyDataSetChanged();
}
}

viewpager适配器：

publicclassMyViewPagerAdapterextendsPagerAdapter{
privateContextcontext;
privateList>list;
privateLayoutInflaterinflater;
privateMyGridViewAdapteradapter;
privateintcurrentPosition;
privateRequestDataListenerlistener;
publicMyViewPagerAdapter(Contextcontext,List>list,RequestDataListenerlistener){
this.context=context;
this.list=list;
this.listener=listener;
inflater=LayoutInflater.from(context);
}

@Override
publicintgetCount(){
returnlist.size();
}

@Override
publicbooleanisViewFromObject(@NonNullViewview,@NonNullObjectobject){
returnview==object;
}

@NonNull
@Override
publicObjectinstantiateItem(@NonNullViewGroupcontainer,intposition){
GridViewview=newGridView(context);
ViewGroup.LayoutParamsparams=newViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
view.setLayoutParams(params);
view.setTag(position);
if(listener!=null&&listener.gridViewColumn()!=0){
view.setNumColumns(listener.gridViewColumn());
}
adapter=newMyGridViewAdapter(context,list.get(position),listener);
view.setAdapter(adapter);
container.addView(view);
returnview;
}

@Override
publicvoiddestroyItem(@NonNullViewGroupcontainer,intposition,@NonNullObjectobject){
container.removeView((View)object);
}

@Override
publicintgetItemPosition(@NonNullObjectobject){
//viewpager立即刷新页面
if(list!=null&&list.size()==0){
returnPOSITION_NONE;
}
Viewview=(View)object;
if(currentPosition==(Integer)view.getTag()){
returnPOSITION_NONE;
}else{
returnPOSITION_UNCHANGED;
}
}

@Override
publicvoidnotifyDataSetChanged(){
super.notifyDataSetChanged();
if(adapter!=null){
adapter.notifyDataSetChanged();
}
}

publicvoidsetCurrentPosition(intcurrentPosition){
this.currentPosition=currentPosition;
}
}

gridview适配器

publicclassMyGridViewAdapterextendsBaseAdapter{
privateContextcontext;
privateListlist;
privateLayoutInflaterinflater;
privateRequestDataListenerlistener;
publicMyGridViewAdapter(Contextcontext,Listlist,RequestDataListenerlistener){
this.context=context;
this.list=list;
this.listener=listener;
inflater=LayoutInflater.from(context);
}
@Override
publicintgetCount(){
returnlist.size();
}

@Override
publicObjectgetItem(intposition){
returnlist.get(position);
}

@Override
publiclonggetItemId(intposition){
returnposition;
}

@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
convertView=listener.getView(inflater,position,convertView,parent,list);
intwidth;
//计算item的宽
if(listener!=null&listener.gridViewColumn()!=0){
width=parent.getWidth()/listener.gridViewColumn();
}else{
width=parent.getWidth()/3;
}
//设置item的宽高相等
convertView.setLayoutParams(newAbsListView.LayoutParams(width,width));
returnconvertView;
}
}

暴露的接口

publicinterfaceRequestDataListener{
voidrequest(intposition);
//gridView列数
intgridViewColumn();
ViewgetView(LayoutInflaterinflater,intposition,ViewconvertView,ViewGroupparent,Listlist);
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

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android九宫格可分页加载控件使用详解

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