BaseAdapter封装优化

逃离我推掉我的手 2022-07-11 07:14 183阅读 0赞

参照ArrayAdapter的源码，对BasAdapter进行封装。添加addAll（），remove（），clear（），sort（）等操作数据源的方法。

## 代码如下 ##

public abstract class BaseAdapterWraper<D> extends BaseAdapter {
    
      private List<D> mInfos = new ArrayList<>();
      private final Object mLock = new Object();
    
      protected LayoutInflater mInflater;
      protected Context context;
      private boolean mNotifyOnChange = true;
    
      public BaseAdapterWraper(Context context) {
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.context = context;
      }
      @Override
      public void notifyDataSetChanged() {
        super.notifyDataSetChanged();
        mNotifyOnChange = true;
      }
      public void setNotifyOnChange(boolean notifyOnChange) {
        mNotifyOnChange = notifyOnChange;
      }
    
      public Context getContext() {
        return context;
      }
    
      public int getCount() {
        return isEmpty() ? 0 : mInfos.size();
      }
    
      public D getItem(int position) {
        return isEmpty() ? null : mInfos.get(position);
      }
    
      public long getItemId(int position) {
        return position;
      }
    
      public abstract View getView(int position, View convertView, ViewGroup parent);
    
      public void setDatas(@Nullable List<D> infos) {
        mInfos = infos;
        notifyDataSetChanged();
      }
    
      public List<D> getDatas() {
        return mInfos;
      }
    
      public boolean isEmpty() {
        return mInfos == null;
      }
    
      public void add(D t) {
        synchronized (mLock) {
          if (isEmpty()) {
            return;
          }
          mInfos.add(t);
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
    
      public void addAll(List<D> list) {
        synchronized (mLock) {
          if (isEmpty()) {
            return;
          }
          if (list != null) {
            mInfos.addAll(list);
          }
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
    
      public void clear() {
        if (isEmpty()) {
          return;
        }
        synchronized (mLock) {
          mInfos.clear();
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
      public void remove(D t){
        synchronized (mLock){
          if(isEmpty()){
            return;
          }
          if(mInfos != null){
            mInfos.remove(t);
          }
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
      public void insert(D t, int index){
        synchronized (mLock){
          if(isEmpty()){
            return;
          }
          if(mInfos != null){
            mInfos.add(index,t);
          }
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
    
      public void sort(Comparator<? super D> comparator){
        synchronized (mLock){
          if(isEmpty()){
            return;
          }
          if(mInfos != null){
            Collections.sort(mInfos, comparator);
          }
        }
        if (mNotifyOnChange) notifyDataSetChanged();
      }
      public void hideLastPositionView(int position, View v) {
        v.setVisibility(position == getCount() - 1 ? View.GONE : View.VISIBLE);
      }
    
      public void lastPositionDividerFull(int position, View v, int margin) {
        LayoutParams params =
            new LayoutParams(LayoutParams.MATCH_PARENT, DensityUtil.dip2px(context, 0.6f));
        if (position == getCount() - 1) {
          params.setMargins(0, 0, 0, 0);
        } else {
          params.setMargins(margin, 0, 0, 0);
        }
        v.setLayoutParams(params);
      }
    
      @SuppressWarnings("unchecked")
      protected static <T extends View> T findViewById(View view, int id) {
        return (T) view.findViewById(id);
      }
    }

## ArrayAdapter源码如下 ##