08-25 convertView、ViewHolder、MyfruitPractice、divider、Header

convertView、ViewHolder

//convertView爲了避免重複創建id，減少了加載的時間，佔用內存比較少
//如果不用，每條數據都會生成一個view，使用兩者，如果屏幕顯示10個，生成14個左右的view，循環使用
 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Student student=mDate.get(position);
        ViewHolder vh=null;
        if(convertView==null){
            vh=new ViewHolder();
            convertView=mInflater.inflate(R.layout.layout_simple,null);
            vh.imageView= (ImageView) convertView.findViewById(R.id.imageview_head);
            vh.teview_name= (TextView) convertView.findViewById(R.id.textview_name);
            vh.textview_sex= (TextView) convertView.findViewById(R.id.textview_sex);
            vh.textview_age= (TextView) convertView.findViewById(R.id.textview_age);
            vh.texview_hobby= (TextView) convertView.findViewById(R.id.textview_hobby);
            convertView.setTag(vh);
            Log.d("converView","countview爲空的加載"+(count));
        }else{
            vh= (ViewHolder) convertView.getTag();
            Log.d("converView","countview不爲空的加載"+(count));
        }
        count++;
        vh.imageView.setImageResource(student.getImp());
        vh.teview_name.setText(student.getName());
        vh.textview_sex.setText(student.getSex());
        vh.textview_age.setText(student.getAge());
        vh.texview_hobby.setText(student.getHobby());
        return convertView;
    }
    class ViewHolder {
        ImageView imageView;
        TextView teview_name;
        TextView textview_sex;
        TextView textview_age;
        TextView texview_hobby;
    }
}

MyfruitPractice、divider、Header

//**activity_fruit.xml**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/lisiview_fruit"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="@color/pink"
        android:dividerHeight="1dp"></ListView>
</LinearLayout>
![這裏寫圖片描述](http://img.blog.csdn.net/20150825201018577)

//**fruit.xml**   view的模板
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical">

    <CheckBox
        android:id="@+id/checkbox_fruit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:text="選擇水果"/>
    <ImageView
        android:id="@+id/imageview_fruit"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@mipmap/cherry"/>
    <TextView
        android:id="@+id/textview_cherry"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="櫻桃"/>
</LinearLayout>
![這裏寫圖片描述](http://img.blog.csdn.net/20150825201224514)

//**Header 全選按鈕**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button_checkAll"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="全選"/>
</LinearLayout>

//**Foot  反選按鈕**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button_fanxuan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="反選"/>
</LinearLayout>

//**Fruit類**
package com.example.administrator.homework.model;

import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by Administrator on 2015/8/25.
 */
public class Fruit {
    private int  imageView;
    private String textView;
    private boolean isChecked;
    public Fruit(int imageView, String textView) {
        this.imageView = imageView;
        this.textView = textView;
    }



    public int getImageView() {
        return imageView;
    }

    public void setImageView(int imageView) {
        this.imageView = imageView;
    }

    public String getTextView() {
        return textView;
    }

    public void setTextView(String textView) {
        this.textView = textView;
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setIsChecked(boolean isChecked) {
        this.isChecked = isChecked;
    }

}

//**FruitAdapter類**
package com.example.administrator.homework.adapter;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.administrator.homework.MyFruit;
import com.example.administrator.homework.R;
import com.example.administrator.homework.model.Fruit;


import java.util.List;

/**
 * Created by Administrator on 2015/8/25.
 */
public class FruitAdapter extends BaseAdapter{
    private List<Fruit> mFruit;
    private LayoutInflater mInflater;
    private boolean[] mMangerALLCheckBox;

    public FruitAdapter(List<Fruit> mFruit, LayoutInflater mInflater) {
        this.mFruit = mFruit;
        this.mInflater = mInflater;
        mMangerALLCheckBox=new boolean[mFruit.size()];
    }

    //全選的方法
    public void checkAll(){
        for(int i=0;i<mMangerALLCheckBox.length;i++){
            mMangerALLCheckBox[i]=true;
            notifyDataSetChanged();
        }
    }
    //反選的方法
    public void fanxuan(){
        for (int i = 0; i <mMangerALLCheckBox.length ; i++) {
            mMangerALLCheckBox[i]=!mMangerALLCheckBox[i];
            notifyDataSetChanged();
        }
    }

    public void itemSeleck(int posotion){
        mMangerALLCheckBox[posotion]=!mMangerALLCheckBox[posotion];
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {

        return mFruit.size();
    }

    @Override


    public Object getItem(int position) {
        return position;
    }

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        Fruit fruit=mFruit.get(position);
        ViewHolder viewHolder=null;
        if(convertView==null){
            viewHolder=new ViewHolder();
            convertView=mInflater.inflate(R.layout.fruit,null);
            viewHolder.imageView= (ImageView) convertView.findViewById(R.id.imageview_fruit);
            viewHolder.textView= (TextView) convertView.findViewById(R.id.textview_cherry);
            viewHolder.checkBox= (CheckBox) convertView.findViewById(R.id.checkbox_fruit);
            convertView.setTag(viewHolder);
        }else{
            viewHolder= (ViewHolder) convertView.getTag();
        }
        viewHolder.imageView.setImageResource(fruit.getImageView());
        viewHolder.textView.setText(fruit.getTextView());
        viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Log.d("Myfruit","選擇框發生變化"+isChecked);
//                mFruit.get(position).setIsChecked(isChecked);
                mMangerALLCheckBox[position]=isChecked;
                notifyDataSetChanged();
            }
        });
//        viewHolder.checkBox.setChecked(fruit.isChecked());
        viewHolder.checkBox.setChecked(mMangerALLCheckBox[position]);
        return convertView;
    }
    class ViewHolder{
        ImageView imageView;
        TextView textView;
        CheckBox checkBox;
    }
}

//**MyFruitActivity類**
package com.example.administrator.homework;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;

import com.example.administrator.homework.adapter.FruitAdapter;
import com.example.administrator.homework.adapter.StudentAdapter;
import com.example.administrator.homework.model.Fruit;
import com.example.administrator.homework.model.Student;

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

/**
 * Created by Administrator on 2015/8/25.
 */
public class MyFruit extends Activity{
    private ListView mListView;
    private List<Fruit> mFruit;
    private FruitAdapter mAdapter;
    LayoutInflater mInflater;
    private View mHeaderView;
    private Button mBtnCheckAll;
    private View mFootView;
    private Button mBtnFan;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_myfruit);
        mListView= (ListView) findViewById(R.id.lisiview_fruit);
        mInflater=getLayoutInflater();
        initDate();
        //全選按鈕
        mHeaderView=mInflater.inflate(R.layout.fruit_header,null);
        mBtnCheckAll= (Button) mHeaderView.findViewById(R.id.button_checkAll);
        mBtnCheckAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAdapter.checkAll();
            }
        });
        mListView.addHeaderView(mHeaderView);

        //反選按鈕
        mFootView=mInflater.inflate(R.layout.fruit_foot,null);
        mBtnFan= (Button) mFootView.findViewById(R.id.button_fanxuan);
        mBtnFan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAdapter.fanxuan();
            }
        });
        mListView.addFooterView(mFootView);

        mAdapter=new FruitAdapter(mFruit,mInflater);
        mListView.setAdapter(mAdapter);
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Log.d("MyFruit","選中的水果是："+mFruit.get(position-1).getTextView());
                mAdapter.itemSeleck(position-1);
            }
        });

    }
    private void initDate() {
        mFruit = new ArrayList<>();
        for (int i=0;i<5;i++){
            Fruit apple = new Fruit(R.mipmap.apple,"蘋果");
            Fruit banana = new Fruit(R.mipmap.banana,"香蕉");
            Fruit cherry = new Fruit(R.mipmap.cherry,"櫻桃");
            Fruit peach = new Fruit(R.mipmap.peach,"桃子");
            mFruit.add(apple);
            mFruit.add(banana);
            mFruit.add(cherry);
            mFruit.add(peach);
        }

    }
}
![這裏寫圖片描述](http://img.blog.csdn.net/20150825202316242)