ListView实现丰富的列表功能

ListView实现丰富的列表功能

1.主布局activity_main.xml

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

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

2.子项布局fruit_item.xml

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

    <ImageView
        android:id="@+id/fruit_image"
        android:layout_width="150dp"
        android:layout_height="150dp"
        />

    <TextView
        android:id="@+id/fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginLeft="10dp"/>

</LinearLayout>

3.水果实体类Fruit.java

package demo.jq.com.listviewtest;

/**
 * Created by DianDoDo on 2017/9/28.
 */

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;
    }
}

4.水果适配器FruitAdapter.java

package demo.jq.com.listviewtest;

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;

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;
    }
}

5.主体逻辑MainActivity.java

package demo.jq.com.listviewtest;

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;

import static android.R.attr.data;

public class MainActivity extends AppCompatActivity {

//    private String[] data = {"Apple","Banana","Orange","Watermelon","Apple","Banana","Orange","Watermelon","Apple","Banana","Orange","Watermelon","Apple","Banana","Orange","Watermelon"};
    private List<Fruit> fruitList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initFruits(); // 初始化水果数据
        FruitAdapter adapter = new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList);

//        ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,data);

        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.drawable.apple_pic);
            fruitList.add(apple);
            Fruit banana = new Fruit("Banana",R.drawable.banana_pic);
            fruitList.add(banana);
            Fruit orange = new Fruit("Orange",R.drawable.orange_pic);
            fruitList.add(orange);
            Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon_pic);
            fruitList.add(watermelon);
        }
    }
}

添加选项点击事件

listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int positon, long id) {
                Fruit fruit = fruitList.get(positon);
                Toast.makeText(MainActivity.this,fruit.getName(),Toast.LENGTH_SHORT).show();
            }
});