Android ListView简单使用

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.jokey.listview.adapter.CommonAdapter;
import com.jokey.listview.adapter.CommonViewHolder;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ImageView ivImageViewNoData;
    private ListView lvListView;
    private MyAdapter mAdapter;
    private List<String> mList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init() {
        ivImageViewNoData = (ImageView) findViewById(R.id.iv_imageView_noData);
        lvListView = (ListView) findViewById(R.id.lv_listView);
        mList = new ArrayList<>();
        lvListView.setAdapter(mAdapter = new MyAdapter(this, mList, R.layout.item_listview));
        // 无数据时显示该View
        lvListView.setEmptyView(ivImageViewNoData = (ImageView) findViewById(R.id.iv_imageView_noData));
        addItem();
    }

    private void addItem() {
        for (char i = 'a'; i <= 'z'; i++) {
            mList.add("" + i);
        }
        mAdapter.notifyDataSetChanged();
    }

    private class MyAdapter extends CommonAdapter<String> {

        private List<String> mListData;

        public MyAdapter(Context context, List<String> listDatas, int layoutId) {
            super(context, listDatas, layoutId);
            this.mListData = listDatas;
        }

        @Override
        protected void fillData(CommonViewHolder holder, int position) {
            String text = mListData.get(position);
            ((TextView)holder.getView(R.id.textView)).setText(text);
        }
    }
}

import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class CommonAdapter<T> extends BaseAdapter {

   private Context context;
   private List<T> listDatas;
   private int layoutId;

   public CommonAdapter(Context context, List<T> listDatas, int layoutId) {
      super();
      this.context = context;
      this.listDatas = listDatas;
      this.layoutId = layoutId;
   }

   @Override
   public int getCount() {
      return this.listDatas == null ? 0 : this.listDatas.size();
   }

   @Override
   public Object getItem(int position) {
      return this.listDatas.get(position);
   }

   @Override
   public long getItemId(int position) {
      return position;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
      // TODO Auto-generated method stub
      CommonViewHolder holder = CommonViewHolder.getViewHolder(this.context, convertView, parent, this.layoutId);
      this.fillData(holder, position);
      return holder.getMConvertView();
   }

   /**
    * 抽象方法，用于子类实现，填充数据
    * 
    * @param holder
    * @param position
    */
   protected abstract void fillData(CommonViewHolder holder, int position);
   
}

import android.content.Context;
import android.util.Log;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class CommonViewHolder {

   private SparseArray<View> mViews;
   private View mConvertView;

   public CommonViewHolder(Context context, ViewGroup parent, int layoutId) {
      mViews = new SparseArray<View>();
      mConvertView = LayoutInflater.from(context).inflate(layoutId, null);
      mConvertView.setTag(this);
   }

   public static CommonViewHolder getViewHolder(Context context,
         View convertView, ViewGroup parent, int layoutId) {
      if (convertView == null)
         return new CommonViewHolder(context, parent, layoutId);
      return (CommonViewHolder) convertView.getTag();
   }

   @SuppressWarnings("unchecked")
   public <T extends View> T getView(int viewId) {
      View item = mViews.get(viewId);
      if (item == null) {
         item = mConvertView.findViewById(viewId);
         mViews.put(viewId, item);
      }
      return (T) item;
   }

   public View getMConvertView() {
      return mConvertView;
   }
}