📜  Android自定义ListView(添加图像,副标题)

📅  最后修改于: 2020-09-29 02:26:34             🧑  作者: Mango

Android自定义ListView(添加图像,副标题)

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

自定义ListView的示例

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

activity_main.xml

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。

mylist.xml

文件:mylist.xml




    

    
    
    
    


将所有需要的图像放置在可绘制文件夹中。

活动课

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();
                }

            }
        });
    }
}

自定义我们的ListView

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;

    };
}

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