Android listview使用[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。

public class MainActivity extends AppCompatActivity { 
   
    private ListView listView;
    private MyAdapter adapter;
    private List<Person> list;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) { 
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView=findViewById(R.id.listview);
        //给集合赋值
        getData();
        //初始化adapter
        adapter  = new MyAdapter(this,list);
        //给listview设置适配器
        listView.setAdapter(adapter);
        //listview的item点击监听
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
   
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
   
                Person person = list.get(position);
                Toast.makeText(MainActivity.this,person.mContent,Toast.LENGTH_SHORT).show();
            }
        });
    }

	//手动给集合赋值数据
    private List<Person> getData(){ 
   
        list = new ArrayList<Person>();
        for(int i=1;i<=10;i++){ 
   
         Person p = new Person(R.drawable.ic_launcher,i+"","第"+i);
         list.add(p);
        }
        return list;
    }
}

MyAdapter

public class MyAdapter extends BaseAdapter { 
   
    private Context context;
    private List<Person> list;

	//构造函数，给集合赋值
    public MyAdapter(Context context,List<Person> list){ 
   
        this.context=context;
        this.list=list;
    }

    private class ViewHolder{ 
   
        ImageView imageView;
        TextView title;
        TextView content;
    }

    @Override
    public int getCount() { 
   
    	//listview中显示的个数
        return list.size();
    }

    @Override
    public Object getItem(int position) { 
   
        return list.get(position);
    }

    @Override
    public long getItemId(int position) { 
   
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) { 
   
        ViewHolder viewHolder;
        //判断界面是否有缓存
        if(convertView==null){ 
   
            viewHolder= new ViewHolder();
            //初始化item的控件
            convertView= LinearLayout.inflate(parent.getContext(), R.layout.item, null);
            viewHolder.imageView=convertView.findViewById(R.id.imageview);
            viewHolder.title=convertView.findViewById(R.id.title);
            viewHolder.content=convertView.findViewById(R.id.content);
            convertView.setTag(viewHolder);
        }else{ 
   
            viewHolder=(ViewHolder)convertView.getTag();
        }
        //给item控件赋值
        Person person = list.get(position);
        viewHolder.imageView.setBackgroundResource(person.mPicture);
        viewHolder.title.setText(person.mTitle);
        viewHolder.content.setText(person.mContent);

        return convertView;
    }

}

activity_main

<?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"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <!--divider属性设置item间距-->
    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:dividerHeight="10dp"></ListView>

</LinearLayout>

效果图