安卓开发基础适配器,SimpleAdapter 快速演示
第一,主视图如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ListView
android:id="@+id/demo_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
条件视图,用于列表的视图如下
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/sex"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
用于主activity, 代码
package com.example.myapplicationlf;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView demoListView = findViewById(R.id.demo_list_view);
List<Map<String, ?>> dataList = new ArrayList<>();
for(int i = 0; i<50; i++){
Map<String, String> map = new HashMap<>();
map.put("name", "1");
map.put("sex", "男");
dataList.add(map);
}
String[] from ={"name","age","sex"};
int[] to = {R.id.name,R.id.age,R.id.sex};
SimpleAdapter simpleAdapter = new SimpleAdapter(this, dataList,R.layout.item,from,to);
demoListView.setAdapter(simpleAdapter);
}
}这
这儿适配器不是自定义的,所以一个主actity 就完事,所以称简单适配器,这儿功能简单 ,不能根据不同条件显示不同的子列表
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