android中如何使用九宫格可分页加载控件

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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);}

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