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android九宮格可分頁加載控件使用詳解

 更新時間：2020年02月05日 10:43:27   作者：poorSir  
這篇文章主要介紹了android九宮格可分頁加載控件的使用方法，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了android九宮格可分頁加載控件的具體實現(xiàn)代碼，供大家參考，具體內容如下

github地址

基本思路是viewpager+gridview,每一頁viewpager視圖有一個gridview,gridview加載九格。所以要保證數(shù)據(jù)的準確性。數(shù)據(jù)以List< List < T>>的形式?？丶崿F(xiàn)了高度自適應，根據(jù)控件的個數(shù)，計算控件的高度。內部的viewpager和gridview視圖都以動態(tài)創(chuàng)建，無需新建一個xml文件，整個控件只需要一個item的布局文件。

使用方法

使用時可以先請求一個接口，需初始化數(shù)據(jù)，數(shù)據(jù)初始化需要根據(jù)總個數(shù)初始化所有數(shù)據(jù)，在每次分頁加載的時候，再通過請求當頁的數(shù)據(jù)，更改數(shù)據(jù)，刷新頁面。

 viewPager = findViewById(R.id.ninePages);
    //數(shù)據(jù)初始化
    List<List<TestEntity>> lists = new ArrayList<>();
    for (int i = 0; i < 6; i++) {//頁數(shù)
      List<TestEntity> list1 = new ArrayList<>();
      for (int j = 0; j < 9; j++) {//每頁個數(shù)
        TestEntity entity = new TestEntity();
        entity.setText("j=" + j + "/i=" + i);
        list1.add(entity);
      }
      lists.add(list1);
    }
    //設置不每頁重復加載
    viewPager.setEveryRequest(false);
    //設置分頁加載
    viewPager.setPagingLoad(true);
    viewPager.setListener(new RequestDataListener<TestEntity>() {
      @Override
      public void request(int position) {//分頁加載
        List<TestEntity> changeList =new ArrayList<>();
        for (int i = 0; i < 9; i++) {
          TestEntity testEntity = new TestEntity();
          testEntity.setText("change" + i);
          changeList.add(testEntity);
        }
        //數(shù)據(jù)刷新
        viewPager.dataInvalidate(position,changeList);
      }

      @Override
      public int gridViewColumn() {//gridview列數(shù)
        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);要在最后調用

視圖控件：

public class NinePagesPagination<T> extends LinearLayout {
  private View mView;
  private ViewPager viewPager;
  private Context context;
  private List<List<T>> list = new ArrayList<>();
  //已經(jīng)請求過的，不在重復請求
  private List<Integer> hasAdded = new ArrayList<>();
  //是否每次請求
  private boolean isEveryRequest;
  //是否進行分頁加載
  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) {//分頁加載
          if (isEveryRequest) {//每次都請求
            adapter.setCurrentPosition(position);
            listener.request(position);
          } else {//請求過一次將不在重復請求
            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);
        }
      }
    });
  }
  //數(shù)據(jù)刷新
  public void dataInvalidate(int position,List<T> changeList){
    list.set(position, changeList);
    adapter.notifyDataSetChanged();
  }
}

viewpager適配器：

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立即刷新頁面
    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適配器

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;
    //計算item的寬
    if(listener != null &listener.gridViewColumn() != 0){
       width = parent.getWidth()/listener.gridViewColumn();
    }else{
       width = parent.getWidth()/3;
    }
    //設置item的寬高相等
    convertView.setLayoutParams(new AbsListView.LayoutParams(width,width));
    return convertView;
  }
}

暴露的接口

public interface RequestDataListener<T> {
  void request(int position);
  //gridView列數(shù)
  int gridViewColumn();
  View getView(LayoutInflater inflater, int position, View convertView, ViewGroup parent, List<T> list);
}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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