时间:2021-05-20
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< List < T>>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<List<TestEntity>> lists = new ArrayList<>(); for (int i = 0; i < 6; i++) {//页数 List<TestEntity> list1 = new ArrayList<>(); for (int j = 0; j < 9; j++) {//每页个数 TestEntity entity = new TestEntity(); 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(new RequestDataListener<TestEntity>() { @Override public void request(int position) {//分页加载 List<TestEntity> changeList =new ArrayList<>(); for (int i = 0; i < 9; i++) { TestEntity testEntity = new TestEntity(); testEntity.setText("change" + i); changeList.add(testEntity); } //数据刷新 viewPager.dataInvalidate(position,changeList); } @Override public int gridViewColumn() {//gridview列数 return 3; } @Override public View getView(LayoutInflater inflater, int position, View convertView, ViewGroup parent, List<TestEntity> list) { ViewHolder viewHolder = null; if(convertView == null){ convertView = inflater.inflate(R.layout.item_gridview,parent,false); viewHolder = new ViewHolder(); viewHolder.textView = convertView.findViewById(R.id.textview); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.textView.setText(list.get(position).getText()); return convertView; } }); viewPager.setList(lists);class ViewHolder{ private TextView textView; }注意:viewPager.setList(lists);要在最后调用
视图控件:
public class NinePagesPagination<T> extends LinearLayout { private View mView; private ViewPager viewPager; private Context context; private List<List<T>> list = new ArrayList<>(); //已经请求过的,不在重复请求 private List<Integer> hasAdded = new ArrayList<>(); //是否每次请求 private boolean isEveryRequest; //是否进行分页加载 private boolean isPagingLoad; private RequestDataListener listener; private MyViewPagerAdapter adapter; private ViewPager.OnPageChangeListener pageChangeListener; public NinePagesPagination(Context context, @Nullable AttributeSet attrs) { super(context, attrs); this.context = context; viewPager = new ViewPager(context); LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); viewPager.setLayoutParams(params); mView = viewPager; addView(mView); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if(listener!=null && listener.gridViewColumn() != 0){ int column = listener.gridViewColumn(); int row = (int) Math.ceil((double) list.get(0).size()/column); int heightMeasureSpec2 = MeasureSpec.makeMeasureSpec(row*getWidth()/column, MeasureSpec.AT_MOST); setMeasuredDimension(widthMeasureSpec,heightMeasureSpec2); } } public void setListener(RequestDataListener listener) { this.listener = listener; } public void setPageChangeListener(ViewPager.OnPageChangeListener pageChangeListener) { this.pageChangeListener = pageChangeListener; } public void setEveryRequest(boolean everyRequest) { isEveryRequest = everyRequest; } public void setPagingLoad(boolean pagingLoad) { isPagingLoad = pagingLoad; } public void setList(List<List<T>> list) { this.list = list; initView(); invalidate(); } private void initView() { adapter = new MyViewPagerAdapter(context, list,listener); viewPager.setAdapter(adapter); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if(pageChangeListener != null){ pageChangeListener.onPageScrolled(position,positionOffset,positionOffsetPixels); } } @Override public void onPageSelected(int position) { 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 public void onPageScrollStateChanged(int state) { if(pageChangeListener != null){ pageChangeListener.onPageScrollStateChanged(state); } } }); } //数据刷新 public void dataInvalidate(int position,List<T> changeList){ list.set(position, changeList); adapter.notifyDataSetChanged(); }}viewpager适配器:
public class MyViewPagerAdapter<T> extends PagerAdapter { private Context context; private List<List<T>> list; private LayoutInflater inflater; private MyGridViewAdapter adapter; private int currentPosition; private RequestDataListener listener; public MyViewPagerAdapter(Context context, List<List<T>> list,RequestDataListener listener) { this.context = context; this.list = list; this.listener = listener; inflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public boolean isViewFromObject(@NonNull View view, @NonNull Object object) { return view == object; } @NonNull @Override public Object instantiateItem(@NonNull ViewGroup container, int position) { GridView view = new GridView(context); ViewGroup.LayoutParams params = new ViewGroup.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 = new MyGridViewAdapter(context, list.get(position),listener); view.setAdapter(adapter); container.addView(view); return view; } @Override public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) { container.removeView((View) object); } @Override public int getItemPosition(@NonNull Object object) { //viewpager立即刷新页面 if (list != null && list.size() == 0) { return POSITION_NONE; } View view = (View) object; if (currentPosition == (Integer) view.getTag()) { return POSITION_NONE; } else { return POSITION_UNCHANGED; } } @Override public void notifyDataSetChanged() { super.notifyDataSetChanged(); if(adapter != null){ adapter.notifyDataSetChanged(); } } public void setCurrentPosition(int currentPosition) { this.currentPosition = currentPosition; }}gridview适配器
public class MyGridViewAdapter<T> extends BaseAdapter{ private Context context; private List<T> list; private LayoutInflater inflater; private RequestDataListener listener; public MyGridViewAdapter(Context context, List<T> list,RequestDataListener listener){ this.context = context; this.list = list; this.listener = listener; inflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { convertView = listener.getView(inflater,position,convertView,parent,list); int width; //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(new AbsListView.LayoutParams(width,width)); return convertView; }}暴露的接口
public interface RequestDataListener<T> { void request(int position); //gridView列数 int gridViewColumn(); View getView(LayoutInflater inflater, int position, View convertView, ViewGroup parent, List<T> list);}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。
声明:本页内容来源网络,仅供用户参考;我单位不保证亦不表示资料全面及准确无误,也不保证亦不表示这些资料为最新信息,如因任何原因,本网内容或者用户因倚赖本网内容造成任何损失或损害,我单位将不会负任何法律责任。如涉及版权问题,请提交至online#300.cn邮箱联系删除。
iOS7.0.4怎么设置九宫格?很多人升级iOS7.0.4之后发现没有九宫格输入法,那么iOS7.0.4有没有九宫格输入法呢?iOS7.0.4九宫格设置?跟着小
iOS7.1怎么设置九宫格?很多人升级iOS7.1之后发现没有九宫格输入法,那么iOS7.1有没有九宫格输入法呢?iOS7.1九宫格设置?跟着百事网小编一起来学
本文实例讲述了android实现九宫格(gridview中各项平分空间)的方法。分享给大家供大家参考。具体如下:项目需要做一个九宫格(也不一定是9的,4宫格、1
相信大家都有使用九宫格解锁,比如在设置手机安全项目中,可以使用九宫格解锁,提高安全性,以及在使用支付功能的时候,为了提高安全使用九宫锁,今天就为大家介绍Andr
很多朋友在问为什么ipadmini升级ios7没有九宫格呢?小编也觉得纳闷,ios7新增了九宫格功能,但是ipadmini升级ios7之后却找不到九宫格输入