listview练习
java代码
1 package com.example.myapplication.listview; 2 3 import androidx.appcompat.app.AppCompatActivity; 4 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.AdapterView; 8 import android.widget.ListView; 9 import android.widget.Toast; 10 11 import com.example.myapplication.R; 12 13 public class ListViewActivity extends AppCompatActivity { 14 private ListView List1; 15 @Override 16 protected void onCreate(Bundle savedInstanceState) { 17 super.onCreate(savedInstanceState); 18 setContentView(R.layout.activity_list_view); 19 List1=findViewById(R.id.List1); 20 List1.setAdapter(new MylistAdapter(ListViewActivity.this)); 21 List1.setOnItemClickListener(new AdapterView.OnItemClickListener() { 22 @Override 23 public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 24 Toast.makeText(ListViewActivity.this,"你选的商品为"+(i+1)+"号",Toast.LENGTH_SHORT).show(); 25 } 26 }); 27 } 28 }
适配器
1 package com.example.myapplication.listview; 2 3 import android.content.Context; 4 import android.view.LayoutInflater; 5 import android.view.View; 6 import android.view.ViewGroup; 7 import android.widget.BaseAdapter; 8 import android.widget.TextView; 9 10 import java.text.SimpleDateFormat; 11 import java.util.Date; 12 import java.util.Locale; 13 import java.util.TimeZone; 14 15 import com.example.myapplication.R; 16 17 public class MylistAdapter extends BaseAdapter{ 18 private Context context1; 19 private LayoutInflater layoutInflater1; 20 21 public MylistAdapter (Context context){ 22 this.context1=context; 23 layoutInflater1=LayoutInflater.from(context); 24 } 25 public int getCount() { 26 return 5; 27 } 28 29 @Override 30 public Object getItem(int i) { 31 return null; 32 } 33 34 @Override 35 public long getItemId(int i) { 36 return 0; 37 } 38 static class ViewHolder{ 39 public TextView tv_title,tv_wupin,tv_time; 40 } 41 @Override 42 public View getView(int i, View v, ViewGroup viewGroup) { 43 ViewHolder holder =null; 44 if (v==null){ 45 v = layoutInflater1.inflate(R.layout.activity_list_item,null); 46 holder = new ViewHolder(); 47 holder.tv_time=v.findViewById(R.id.tv_time); 48 holder.tv_wupin=v.findViewById(R.id.tv_wupin); 49 holder.tv_title=v.findViewById(R.id.tv_title); 50 v.setTag(holder); 51 }else { 52 holder= (ViewHolder) v.getTag(); 53 } 54 SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 55 String date = sDateFormat.format(new java.util.Date()); 56 holder.tv_title.setText("用户你好"); 57 holder.tv_time.setText(date); 58 holder.tv_wupin.setText("请选择你喜爱的物品"); 59 return v; 60 } 61 }
xml
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:orientation="horizontal" 6 android:padding="15dp"> 7 8 <ImageView 9 android:layout_width="100dp" 10 android:layout_height="100dp" 11 android:scaleType="fitXY" 12 android:background="@drawable/xiaohuli"/> 13 <LinearLayout 14 android:layout_width="match_parent" 15 android:layout_height="wrap_content" 16 android:orientation="vertical"> 17 <TextView 18 android:id="@+id/tv_title" 19 android:layout_width="match_parent" 20 android:layout_height="wrap_content" 21 android:text="用户你好" 22 android:gravity="center" 23 android:textSize="30dp" 24 android:textColor="#000000" 25 android:layout_marginLeft="15dp"/> 26 <TextView 27 android:id="@+id/tv_time" 28 android:layout_width="wrap_content" 29 android:layout_height="wrap_content" 30 android:layout_marginLeft="15dp" 31 android:text="现在时间为:2000-11-5" 32 android:textSize="26dp" 33 /> 34 <TextView 35 android:id="@+id/tv_wupin" 36 android:layout_width="wrap_content" 37 android:layout_height="wrap_content" 38 android:layout_marginLeft="15dp" 39 android:gravity="center" 40 android:text="请选择你喜爱的物品" 41 android:textSize="26dp" 42 /> 43 44 </LinearLayout> 45 46 </LinearLayout>
