在主类中找到listview并setadapter并监听事件

package com.lingzhuo.test4;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.widget.AdapterView;import android.widget.Button;import android.widget.ListView;import com.lingzhuo.test4.adapter.FruitAdapter;import com.lingzhuo.test4.modle.Fruit;import java.util.ArrayList;public class FriutActivity extends Activity {    private ArrayList fruits;    private LayoutInflater inflater;    private ListView mListViewFruit;    private FruitAdapter fruitAdapter;    private View mHeaderView;    private Button mBtnAllSelect;    private Button mBtnAllRevrse;    private View mFootView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_friut);        mListViewFruit = (ListView) findViewById(R.id.mListViewFruit);        inflater = getLayoutInflater();   //只有activity才有getLayoutInflater()方法        fruits = initFruits();        fruitAdapter = new FruitAdapter(inflater,fruits);        mHeaderView = inflater.inflate(R.layout.all_select_button,null);        mListViewFruit.addHeaderView(mHeaderView);                          //会导致position加一        mBtnAllSelect = (Button) mHeaderView.findViewById(R.id.mBtnAllSelect);        mBtnAllSelect.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                fruitAdapter.allSelect();            }        });        mFootView = inflater.inflate(R.layout.all_revrse_button,null);        mListViewFruit.addFooterView(mFootView);        mBtnAllRevrse = (Button) mFootView.findViewById(R.id.mBtnAllRevrse);        mBtnAllRevrse.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                fruitAdapter.allRevrse();            }        });        mListViewFruit.setAdapter(fruitAdapter);        mListViewFruit.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                fruits.get(position-1).setIsChecked(fruits.get(position-1).changeChecked());    //当点击item                fruitAdapter.notifyDataSetChanged();                     //刷新数据            }        });    }    private ArrayList initFruits() {        fruits = new ArrayList();        for(int i =0;i<10;i++) {            fruits.add(new Fruit("apple", R.mipmap.apple));            fruits.add(new Fruit("pineapple", R.mipmap.pineapple));            fruits.add(new Fruit("strawberry", R.mipmap.strawberry));            fruits.add(new Fruit("watermelon", R.mipmap.watermelon));            fruits.add(new Fruit("apple", R.mipmap.apple));        }        return fruits;    }}

性能优化的具体分析

package com.lingzhuo.test4.adapter;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.lingzhuo.test4.R;import com.lingzhuo.test4.modle.Student;import java.util.List;/** * Created by Heinika on 2015/8/24. */public class StudentAdapter extends BaseAdapter{    private List mData;    private LayoutInflater mInflater;    //将inflater和数据传到适配器中    public StudentAdapter(LayoutInflater inflater,List data){        this.mInflater = inflater;        this.mData = data;    }    @Override    public int getCount() {        return mData.size();    }    @Override    public Object getItem(int position) {        return position;    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Student student = mData.get(position);        ViewHold viewHold=null;        if(convertView==null){                                                            //只有充满的的时候才不为空            viewHold = new ViewHold();            convertView = mInflater.inflate(R.layout.item_simple_adapter,null);      //避免每次重复加载            viewHold.mImageViewPhoto = (ImageView) convertView.findViewById(R.id.mImageViewPhoto);  //findviewbyid为耗时操作            viewHold.textView_name = (TextView) convertView.findViewById(R.id.tv_name);              //只当convertView为空时才需要findviewbyid            viewHold.textView_age = (TextView) convertView.findViewById(R.id.tv_age);            viewHold.textView_sex = (TextView) convertView.findViewById(R.id.tv_sex);            convertView.setTag(viewHold);                                                  //将viewHold存到convertView        }else{                                                                          //convertView不为空的加载，convertView创建到一定个数就不再创建            viewHold = (ViewHold) convertView.getTag();        }        viewHold.mImageViewPhoto.setImageResource(student.getImgId());        viewHold.textView_name.setText(student.getName());        viewHold.textView_age.setText(student.getAge()+"");        viewHold.textView_sex.setText(student.getSex());        return convertView;    }    class ViewHold{        ImageView mImageViewPhoto;        TextView textView_name;        TextView textView_age;        TextView textView_sex;    }}

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