=========================
MainActivity：
package com.example.listview;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.baseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import org.w3c.dom.Text;
public class MainActivity extends AppCompatActivity{
public ListView listView;
// 定义需要的适配器数据
// textview名称
public String[] names = new String[]{"Dave", "SteelBlue", "LightSkyBlue", "SkyBlue", "DeepSkyBlue", "LightBLue", "PowDerBlue", "CadetBlue", "Azure", "LightCyan", "PaleTurquoise", "Cyan", "Aqua", "DarkTurquoise", "DarkSlateGray", "DarkCyan", "Teal", "MediumTurquoise", "LightSeaGreen", "Turquoise", "Auqamarin"};
// 图片数据
public Integer[] icons = new Integer[]{R.drawable.pic_0, R.drawable.pic_1, R.drawable.pic_2,
R.drawable.pic_3, R.drawable.pic_4, R.drawable.pic_5, R.drawable.pic_6,
R.drawable.pic_7, R.drawable.pic_8, R.drawable.pic_9, R.drawable.pic_10,
R.drawable.pic_11, R.drawable.pic_12, R.drawable.pic_13, R.drawable.pic_14,
R.drawable.pic_15, R.drawable.pic_16, R.drawable.pic_17, R.drawable.pic_18,
R.drawable.pic_19, R.drawable.pic_20};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.lv);
// listView 展示数据需要适配器
MybaseAdapter mybaseAdapter = new MybaseAdapter();
// 设置adapter
listView.setAdapter(mybaseAdapter);
}
class MybaseAdapter extends baseAdapter{
// 返回item总数
@Override
public int getCount() {
return icons.length;
}
@Override
public Object getItem(int position) {
return icons[position];
}
@Override
public long getItemId(int position) {
return position;
}
// 得到item的View视图
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// 把list_item文件转化为View对象返回
// View view = View.inflate(MainActivity.this, R.layout.list_item, null);
// ImageView imageView = (ImageView) view.findViewById(R.id.item_image);
// TextView textView = (TextView) view.findViewById(R.id.item_text);
// imageView.setImageResource(icons[position]);
// textView.setText(names[position]);
// 优化 convertView复用
ViewHolder viewHolder;
if (convertView == null){
// 把list_item文件转化为View对象
convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.list_item, null);
viewHolder = new ViewHolder();
viewHolder.imageView = (ImageView) convertView.findViewById(R.id.item_image);
viewHolder.textView = (TextView) convertView.findViewById(R.id.item_text);
convertView.setTag(viewHolder);
}else{
// 如果convertView不为空
viewHolder = (ViewHolder)convertView.getTag();
}
viewHolder.textView.setText(names[position]);
viewHolder.imageView.setImageResource(icons[position]);
return convertView;
}
}
class ViewHolder{
TextView textView;
ImageView imageView;
}
}
=========================
activity_main.xml:
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
android:layout_width="match_parent"
android:layout_margin="10dp"
android:divider="#4682B4"
android:dividerHeight="1dp"
android:layout_height="match_parent">
=========================
list_item.xml:
android:layout_gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
android:layout_width="300dp"
android:layout_height="180dp"
android:layout_margin="8dp"/>
android:layout_marginLeft="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="你过来啊"
android:textStyle="bold"
android:textSize="20dp"/>
