高階控制元件ListView基本運用
阿新 • • 發佈:2018-11-09
<?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 ="狂人攝影日記"
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="書本作者:"
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="阿劉" />
</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="書本價格:"
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="電子出版社"
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="書本簡介:"
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="很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天很冷的一個冬天"
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>
ListView邏輯介面
package com.example.android_08;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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> data;
private MyBaseAdapter adapter;
private ListView lv_main_bookList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv_main_bookList=findViewById(R.id.lv_main_bookList);
this.data=new BookDao().list();
adapter=new MyBaseAdapter((LayoutInflater)getSystemService(this.LAYOUT_INFLATER_SERVICE));
lv_main_bookList.setAdapter(adapter);
}
public class MyBaseAdapter extends BaseAdapter{
private LayoutInflater inflater;//解析器
public class ViewHolder{
ImageView iv_listviewitem_image;
TextView tv_listviewitme_title;
TextView tv_listviewitme_price;
TextView tv_listviewitme_publish;
TextView tv_listviewitme_remark;
}
public MyBaseAdapter(LayoutInflater inflater) {
this.inflater = inflater;
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v=convertView;
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_price=v.findViewById(R.id.tv_listviewitme_price);
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=data.get(position);
vh.iv_listviewitem_image.setImageResource(book.getImage());
vh.tv_listviewitme_title.setText(book.getTitle());
vh.tv_listviewitme_price.setText(book.getPrice()+"");
vh.tv_listviewitme_publish.setText(book.getPublish());
vh.tv_listviewitme_remark.setText(book.getRemark());
return v;
}
}
}