ListView_ArrayAdapter学习笔记

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学习了该书籍的ListView的用法总结出学习笔记还望指正

ListView的简单用法

1，在布局文件中添加listView文件 id为list_view

2，声明全局变量 ArrayAdapter<String>、ListView

3，添加数组 data

4，创建适配器

上下文 this

listView子项布局的id android.R.layout.simple_list_item_1

数据 data

5， Listview找到ID

6， Lisiview找到适配器

代码：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.air1997.mylistviewtest1.MainActivity">    <ListView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/list_view"        ></ListView></RelativeLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.ListView;public class MainActivity extends AppCompatActivity {    private ArrayAdapter<String> arrayAdapter;    private ListView listView;    private String[] data={"apple","banana","orange"};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        arrayAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data);        listView=(ListView)findViewById(R.id.list_view);        listView.setAdapter(arrayAdapter);    }}

输出效果如下：

定制ListView 的界面

1，定制适配器的适配类型即新建一个类如Fruit类

public class Fruit {    private String name;    public int getImageId() {        return imageId;    }    public void setImageId(int imageId) {        this.imageId = imageId;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    private int imageId;}

2，创建一个定制的布局如fruit_item.xml并添加Image、TextView 且有各自的id

3，定制一个适配器继承ArrayAdapter适配器例如FruitAdapter

4，声明全局变量resourId

5，在MainActivity.java中使用适配器

代码如下：

activity.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.air1997.mylistviewtest1.MainActivity">    <ListView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/list_view"        ></ListView></RelativeLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.ListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ArrayAdapter<String> arrayAdapter;    private ListView listView;    private String[] data={"apple","banana","orange"};    private List<Fruit> fruitList=new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initFruits();        FruitAdapter adapter=new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList);        ListView listView=(ListView)findViewById(R.id.list_view);        listView.setAdapter(adapter);    }    private void initFruits(){        for (int i=0;i<2;i++){            Fruit apple=new Fruit("Apple",R.mipmap.ic_launcher);            fruitList.add(apple);            Fruit banana=new Fruit("Banana",R.mipmap.ic_launcher);            fruitList.add(banana);            Fruit orange=new Fruit("Orange",R.mipmap.ic_launcher);            fruitList.add(orange);        }    }}

fruit_item.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"><ImageView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/fruit_image"    />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/fruit_name"        /></LinearLayout>

FruitAdapter.java

import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;/** * Created by AIR1997 on 2017/3/9. */public class FruitAdapter extends ArrayAdapter<Fruit> {    private int resourceId;    public FruitAdapter(Context context, int textViewResourceId, List<Fruit> objects){        super(context,textViewResourceId,objects);        resourceId=textViewResourceId;    }    @Override    public View getView(int position , View convertView, ViewGroup parent){        Fruit fruit=getItem(position);        View view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);        ImageView fruitImage=(ImageView)view.findViewById(R.id.fruit_image);        TextView fruitName=(TextView)view.findViewById(R.id.fruit_name);        fruitImage.setImageResource(fruit.getImageId());        fruitName.setText(fruit.getName());        return view;    }}

Fruit.java

public class Fruit {    private String name;    private int imageId;    public Fruit(String name,int imageId){        this.name=name;        this.imageId=imageId;    }    public String getName(){        return name;    }    public int getImageId(){        return imageId;    }}

效果如下：

说明：关于书籍3.5.3及3.5.4 的内容不做笔记

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