📅  最后修改于: 2020-09-29 02:26:34             🧑  作者: Mango
创建简单的ListView之后,android还提供了自定义ListView的功能。
作为简单的ListView,自定义ListView还使用Adapter类,该类添加了数据源中的内容(例如字符串数组,数组,数据库等)。适配器在AdapterView和其他视图之间桥接数据
在此自定义listview示例中,我们将添加图像,带有标题及其副标题的文本。
自定义listview项目的结构
在布局文件夹中创建一个activity_main.xml文件。
文件:activity_main.xml
在布局文件夹中创建一个额外的mylist.xml文件,其中包含在listview中显示的视图组件。
文件:mylist.xml
将所有需要的图像放置在可绘制文件夹中。
文件:MainActivity.java
package com.example.test.listviewwithimage;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
ListView list;
String[] maintitle ={
"Title 1","Title 2",
"Title 3","Title 4",
"Title 5",
};
String[] subtitle ={
"Sub Title 1","Sub Title 2",
"Sub Title 3","Sub Title 4",
"Sub Title 5",
};
Integer[] imgid={
R.drawable.download_1,R.drawable.download_2,
R.drawable.download_3,R.drawable.download_4,
R.drawable.download_5,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyListAdapter adapter=new MyListAdapter(this, maintitle, subtitle,imgid);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView> parent, View view,int position, long id) {
// TODO Auto-generated method stub
if(position == 0) {
//code specific to first list item
Toast.makeText(getApplicationContext(),"Place Your First Option Code",Toast.LENGTH_SHORT).show();
}
else if(position == 1) {
//code specific to 2nd list item
Toast.makeText(getApplicationContext(),"Place Your Second Option Code",Toast.LENGTH_SHORT).show();
}
else if(position == 2) {
Toast.makeText(getApplicationContext(),"Place Your Third Option Code",Toast.LENGTH_SHORT).show();
}
else if(position == 3) {
Toast.makeText(getApplicationContext(),"Place Your Forth Option Code",Toast.LENGTH_SHORT).show();
}
else if(position == 4) {
Toast.makeText(getApplicationContext(),"Place Your Fifth Option Code",Toast.LENGTH_SHORT).show();
}
}
});
}
}
创建另一个扩展ArrayAdapter类的Java类MyListView.java。此类自定义我们的列表视图。
MyListView.java
package com.example.test.listviewwithimage;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyListAdapter extends ArrayAdapter {
private final Activity context;
private final String[] maintitle;
private final String[] subtitle;
private final Integer[] imgid;
public MyListAdapter(Activity context, String[] maintitle,String[] subtitle, Integer[] imgid) {
super(context, R.layout.mylist, maintitle);
// TODO Auto-generated constructor stub
this.context=context;
this.maintitle=maintitle;
this.subtitle=subtitle;
this.imgid=imgid;
}
public View getView(int position,View view,ViewGroup parent) {
LayoutInflater inflater=context.getLayoutInflater();
View rowView=inflater.inflate(R.layout.mylist, null,true);
TextView titleText = (TextView) rowView.findViewById(R.id.title);
ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
TextView subtitleText = (TextView) rowView.findViewById(R.id.subtitle);
titleText.setText(maintitle[position]);
imageView.setImageResource(imgid[position]);
subtitleText.setText(subtitle[position]);
return rowView;
};
}
输出量