listview列表视图的使用
分类: Android 标签: listview的使用
2022-08-22 11:32:19 553浏览
listview的使用
1.使用适配器
package s.jf3q.listview2; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; 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); List<Map<String,Object>> li=new ArrayList<Map<String,Object>>(); Map<String,Object> m=new HashMap<String,Object>(); m.put("nickname","六三"); m.put("faceimg",R.drawable.img1); li.add(m); Map<String,Object> m2=new HashMap<String,Object>(); m2.put("nickname","六三2"); m2.put("faceimg",R.drawable.img2); li.add(m2); Map<String,Object> m3=new HashMap<String,Object>(); m3.put("nickname","六三3"); m3.put("faceimg",R.drawable.img3); li.add(m3); Map<String,Object> m4=new HashMap<String,Object>(); m4.put("nickname","六三4"); m4.put("faceimg",R.drawable.img4); li.add(m4); Map<String,Object> m5=new HashMap<String,Object>(); m5.put("nickname","六三5"); m5.put("faceimg",R.drawable.img5); li.add(m5); Map<String,Object> m6=new HashMap<String,Object>(); m6.put("nickname","六三6"); m6.put("faceimg",R.drawable.img6); li.add(m6); ListView lv=findViewById(R.id.lv2); SimpleAdapter sp=new SimpleAdapter(this,li,R.layout.list,new String []{"nickname","faceimg"},new int[]{R.id.nickname,R.id.faceimg}); lv.setAdapter(sp); lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Map<String,Object> mm=(Map<String,Object>)parent.getItemAtPosition(position); Toast.makeText(MainActivity.this,mm.get("nickname").toString(),Toast.LENGTH_SHORT).show(); } }); } }
main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <ListView android:id="@+id/lv2" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
list.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content"> <ImageView android:id="@+id/faceimg" android:scaleType="centerCrop" android:layout_width="50dp" android:layout_height="50dp"/> <TextView android:id="@+id/nickname" android:padding="10dp" android:text="123" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>
2.简单的数组和数组适配器两种方法
package s.jf3q.listview; import android.widget.ArrayAdapter; import android.widget.ListView; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String[] tt=new String[]{"1","2","3"}; ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,tt); ListView lv=findViewById(R.id.lv); lv.setAdapter(aa); } }
main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <ListView android:entries="@array/tt" android:layout_width="match_parent" android:layout_height="wrap_content"/> <ListView android:layout_alignParentBottom="true" android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="wrap_content"/> </RelativeLayout>
array.xml放在values目录下
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="tt"> <item>1</item> <item>2</item> <item>3</item> <item>4</item> <item>5</item> </string-array> </resources>
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