Android一个Adapter的写法

public class NewsListAdapter extends BaseAdapter {



    private Context mContext;

    private LinkedList<NewsModel> newsList;



    public NewsListAdapter(Context mContext, LinkedList<NewsModel> newsList) {

        this.mContext = mContext;

        this.newsList = newsList == null ? new LinkedList<NewsModel>() : new LinkedList<>(newsList);

    }



    @Override

    public int getCount() {

        return newsList != null ? newsList.size() : 0;

    }



    @Override

    public Object getItem(int position) {

        return position >= newsList.size() ? null : newsList.get(position);

    }



    @Override

    public long getItemId(int position) {

        return position;

    }



    @Override

    public View getView(int position, View convertView, ViewGroup parent) {



        if (convertView == null) {

            convertView = LayoutInflater.from(mContext).inflate(R.layout.newslist_item, parent, false);

        }



        TextView newsTitleView = (TextView) convertView.findViewById(R.id.titleView);

        TextView newsAuthorView = (TextView) convertView.findViewById(R.id.authorView);

        TextView newsDateView = (TextView) convertView.findViewById(R.id.dateView);



        final NewsModel mNewsModel = newsList.get(position);

        newsTitleView.setText(mNewsModel.getTitle());

        newsAuthorView.setText("发布人：" + mNewsModel.getAuthor());

        newsDateView.setText("发布日期：" + new SimpleDateFormat("yyyy.MM.dd HH:mm:ss").format(mNewsModel.getDate()));



        return convertView;

    }



    public void updateData(LinkedList<NewsModel> dataList) {

        this.newsList = dataList;

        this.notifyDataSetChanged();

    }

}

package android.widget;



import android.database.DataSetObserver;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ListAdapter;

import android.widget.SpinnerAdapter;



public abstract class BaseAdapter implements ListAdapter, SpinnerAdapter {

    public BaseAdapter() {

        throw new RuntimeException("Stub!");

    }



    public boolean hasStableIds() {

        throw new RuntimeException("Stub!");

    }



    public void registerDataSetObserver(DataSetObserver observer) {

        throw new RuntimeException("Stub!");

    }



    public void unregisterDataSetObserver(DataSetObserver observer) {

        throw new RuntimeException("Stub!");

    }



    public void notifyDataSetChanged() {

        throw new RuntimeException("Stub!");

    }



    public void notifyDataSetInvalidated() {

        throw new RuntimeException("Stub!");

    }



    public boolean areAllItemsEnabled() {

        throw new RuntimeException("Stub!");

    }



    public boolean isEnabled(int position) {

        throw new RuntimeException("Stub!");

    }



    public View getDropDownView(int position, View convertView, ViewGroup parent) {

        throw new RuntimeException("Stub!");

    }



    public int getItemViewType(int position) {

        throw new RuntimeException("Stub!");

    }



    public int getViewTypeCount() {

        throw new RuntimeException("Stub!");

    }



    public boolean isEmpty() {

        throw new RuntimeException("Stub!");

    }

}

package android.widget;



import android.widget.Adapter;



public interface ListAdapter extends Adapter {

    boolean areAllItemsEnabled();



    boolean isEnabled(int var1);

}

package android.widget;



import android.database.DataSetObserver;

import android.view.View;

import android.view.ViewGroup;



public interface Adapter {

    int IGNORE_ITEM_VIEW_TYPE = -1;

    int NO_SELECTION = -2147483648;



    void registerDataSetObserver(DataSetObserver var1);



    void unregisterDataSetObserver(DataSetObserver var1);



    int getCount();



    Object getItem(int var1);



    long getItemId(int var1);



    boolean hasStableIds();



    View getView(int var1, View var2, ViewGroup var3);



    int getItemViewType(int var1);



    int getViewTypeCount();



    boolean isEmpty();

}

package android.widget;



import android.view.View;

import android.view.ViewGroup;

import android.widget.Adapter;



public interface SpinnerAdapter extends Adapter {

    View getDropDownView(int var1, View var2, ViewGroup var3);

}