简单的用法
ListView是一个非常强大的控件，先看看它的简单用法。
首先，我们在主界面的xml代码中添加这段代码
<ListView
android:id="@+id/list_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ListView>
然后我们在MainActivity中使用适配器来生成界面。
package com.example.listviewtext01;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
private String[] data={
"aa","bb","cc" ,"aa","bb","cc", "aa","bb","cc",
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//第一个参数上下文环境，第二个参数默认的适配布局，第三个参数是数据
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_expandable_list_item_1,data);
ListView listView=(ListView)findViewById(R.id.list_view);
listView.setAdapter(adapter);
}
}
效果如下
自定义ListView
1.创建在ListView中的子布局界面
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
></ImageView>
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
></TextView>
</LinearLayout>
创建要添加的数据类型
package com.example.listviewtext01;
public class Fruit {
private String name;
private int imageId;
public Fruit(String name,int imageId)
{
this.imageId=imageId;
this.name=name;
}
public int getImageId()
{
return imageId;
}
public String getName()
{
return name;
}
}
创建自己的适配器
package com.example.listviewtext;
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 androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.util.List;
public class FruitAdapter extends ArrayAdapter<Fruit> {
private int resouleId;
public FruitAdapter(Context context, int textViewResouleID, List<Fruit> object)
{
super(context,textViewResouleID,object);
resouleId=textViewResouleID;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
Fruit fruit=getItem(position);//获取实例
View view= LayoutInflater.from(getContext()).inflate(resouleId,parent,false);
ImageView fruitimage=(ImageView)view.findViewById(R.id.fruit_imag);
TextView fruitName=(TextView)view.findViewById(R.id.fruit_name);
fruitimage.setImageResource(fruit.getImageid());
fruitName.setText(fruit.getName());
return view;
}
}
使用界面
package com.example.listviewtext;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private String data[]=
{
"hello","jasbd","asnbd","sdhnambd","Sdhabd","sndba"
};
private List<Fruit>fruitList=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this
,android.R.layout.simple_list_item_1,data);*/
initFruits();
FruitAdapter adapter=new FruitAdapter(MainActivity.this,R.layout.activity_fruit_layout
,fruitList);
ListView listView=(ListView)findViewById(R.id.list_View);
listView.setAdapter(adapter);
}
public void initFruits()
{
for(int i=0;i<15;i++)
{
Fruit apple=new Fruit("apple",R.drawable.ic_launcher_background);
fruitList.add(apple);
}
}
}