android高级控件ListView

最新推荐文章于 2024-10-05 21:26:43 发布

原创最新推荐文章于 2024-10-05 21:26:43 发布 · 1.1k 阅读

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本文详细介绍了一个使用ListView展示书籍信息的应用案例，包括自定义布局、创建实体类、填充数据及实现自定义适配器的过程。

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高级控件ListView

这个是要用到的布局

<?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="wrap_content"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/iv_listviewitem_image"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:padding="10dp"
        android:scaleType="fitXY"
        android:src="@drawable/book1" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="6"
        android:orientation="vertical"
        android:padding="10dp" >

        <TextView
            android:id="@+id/tv_listviewitme_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="狂人摄影日记"
            android:textColor="@color/red"
            android:textSize="20sp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:text="书本作者："
                android:textColor="@color/black" />

            <TextView
                android:id="@+id/tv_listviewitme_author"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="阿刘" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:text="书本价格："
                android:textColor="@color/black" />

            <TextView
                android:id="@+id/tv_listviewitme_price"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="$123"
                android:textColor="@color/black" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:text="    出版社："
                android:textColor="@color/black" />

            <TextView
                android:id="@+id/tv_listviewitme_publish"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:text="电子出版社"
                android:textColor="@color/black" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:text="书本简介："
                android:textColor="@color/black" />

            <TextView
                android:id="@+id/tv_listviewitme_remark"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:ellipsize="end"
                android:maxLines="2"
                android:text="很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天很冷的一个冬天"
                android:textColor="@color/black" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:orientation="horizontal" >

            <ImageButton
                android:id="@+id/bt_listviewitme_btn1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_weight="1"
                android:src="@drawable/btn_shopping" />

            <ImageButton
                android:id="@+id/bt_listviewitme_btn2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_weight="1"
                android:src="@drawable/btn_accounts" />
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

一个实体类

package com.example.android_09;

public class Book {
    private Integer id;
    private String title;
    private String author;

    private Float price;
    private String publish;
    private String remark;

    private int image;

    public Book() {
        super();
    }

    public int getImage() {
        return image;
    }

    public void setImage(int image) {
        this.image = image;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public Float getPrice() {
        return price;
    }

    public void setPrice(Float price) {
        this.price = price;
    }

    public String getPublish() {
        return publish;
    }

    public void setPublish(String publish) {
        this.publish = publish;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

}

加好数据

package com.example.android_09;

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

public class BookDao {

    private int[] bookImages = new int[] { R.drawable.book1, R.drawable.book2,
            R.drawable.book3, R.drawable.book4, R.drawable.book5,
            R.drawable.book6, R.drawable.book7, R.drawable.book8,
            R.drawable.book9, R.drawable.book10 };

    public List<Book> list() {
        List<Book> list = new ArrayList<Book>();
        for (int i = 1; i <= 50; i++) {
            Book b = new Book();
            b.setId(i);
            b.setTitle("t" + i);
            b.setAuthor("a" + i);
            b.setPrice(0.0f + i);
            b.setPublish("p" + i);
            b.setRemark("r" + i);
            // ��ʵ����ͼƬӦ���Ǵ������ȡ�����Ǳ��ػ��
            b.setImage(bookImages[i % bookImages.length]);

            list.add(b);
        }

        return list;
    }
}

package com.example.android_09;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity {
    private List<Book> list;
    //自定义适配器
    private MyBaseAdapter adapter;
    private ListView lv_main_01;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv_main_01=findViewById(R.id.lv_main_01);

        list=new BookDao().list();
        adapter=new MyBaseAdapter((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE));
        lv_main_01.setAdapter(adapter);
    }
    //自定义的适配器
    public class MyBaseAdapter extends BaseAdapter{
        public class ViewHolder{
            ImageView iv_listviewitem_image;
            TextView tv_listviewitme_title;
            TextView tv_listviewitme_author;
            TextView tv_listviewitme_price;
            TextView tv_listviewitme_publish;
            TextView tv_listviewitme_remark;

        }
       private LayoutInflater inflater;


        public MyBaseAdapter(LayoutInflater inflater) {
            this.inflater = inflater;
        }
//这个是获取到的数据有多少条
        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int i) {
            return list.get(i);
        }

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

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {

            View v=view;

            if(v==null){
                ViewHolder vh=new ViewHolder();
                v=inflater.inflate(R.layout.listview_item,null);
                vh.iv_listviewitem_image=v.findViewById(R.id.iv_listviewitem_image);
                vh.tv_listviewitme_title = v.findViewById(R.id.tv_listviewitme_title);
                vh.tv_listviewitme_author = v.findViewById(R.id.tv_listviewitme_author);
                vh.tv_listviewitme_price = v.findViewById(R.id.tv_listviewitme_price);
                vh.tv_listviewitme_publish = v.findViewById(R.id.tv_listviewitme_publish);
                vh.tv_listviewitme_publish = v.findViewById(R.id.tv_listviewitme_publish);
                vh.tv_listviewitme_remark = v.findViewById(R.id.tv_listviewitme_remark);
                v.setTag(vh);
            }

            ViewHolder vh = (ViewHolder) v.getTag();
            Book book=list.get(i);
            vh.iv_listviewitem_image.setImageResource(book.getImage());
            vh.tv_listviewitme_title.setText(book.getTitle());
            vh.tv_listviewitme_author.setText(book.getAuthor());
            vh.tv_listviewitme_price.setText(book.getPrice()+"");
            vh.tv_listviewitme_publish.setText(book.getPublish());
            vh.tv_listviewitme_remark.setText(book.getRemark());
            return v;
        }
    }
}