Android Studio [ListView]

ListViewActivity.java

package com.xdw.a122.listview;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.xdw.a122.R;

public class ListViewActivity extends Activity {
    private ListView mLv1;
    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_listview);
        mLv1 = findViewById(R.id.lv_1);
        mLv1.setAdapter(new MyListAdapter(ListViewActivity.this));
        mLv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(ListViewActivity.this, "点击 pos:" + position, Toast.LENGTH_LONG).show();
            }
        });
        mLv1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(ListViewActivity.this, "长按 pos:" + position, Toast.LENGTH_LONG).show();
                return true;
            }
        });
    }
}

MyListAdapter.java

package com.xdw.a122.listview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.xdw.a122.R;

public class MyListAdapter extends BaseAdapter {
    private Context mContext;
    private LayoutInflater mLayoutInflater;

    MyListAdapter(Context context){
        this.mContext=context;
        mLayoutInflater=LayoutInflater.from(context);
    }
    @Override
    public int getCount() {
        return ;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return ;
    }
    static class ViewHolder{
        public ImageView imageView;
        public TextView tvTitle,tvTime,tvContent;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder=null;
        if(convertView==null){
            convertView=mLayoutInflater.inflate(R.layout.layout_list_item,null);
            holder=new ViewHolder();
            holder.imageView=convertView.findViewById(R.id.iv);
            holder.tvTitle=convertView.findViewById(R.id.tv_title);
            holder.tvTime=convertView.findViewById(R.id.tv_time);
            holder.tvContent=convertView.findViewById(R.id.tv_content);
            convertView.setTag(holder);
        }
        else{
            holder=(ViewHolder) convertView.getTag();
        }
        //给控件赋值
        holder.tvTitle .setText("这是标题");
        holder.tvTime.setText("2088-08-08");
        holder.tvContent.setText("这是内容");
        Glide.with(mContext).load("https://www.baidu.com/img/bd_logo1.png?where=super").into(holder.imageView);
        return convertView;
    }
}

layout_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:paddingLeft="15dp"
    android:paddingRight="15dp"
    android:paddingTop="10dp"
    android:paddingBottom="10dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:scaleType="centerCrop"
        android:background="#000"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingLeft="10dp">
        <TextView
            android:id="@+id/tv_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello"
            android:textSize="20sp"
            android:textColor="#000"/>
        <TextView
            android:id="@+id/tv_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2019.4.14"
            android:textSize="20sp"
            android:textColor="#000"
            />
        <TextView
            android:id="@+id/tv_content"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="内容"
            android:textSize="20sp"
            android:textColor="#000"/>
    </LinearLayout>
</LinearLayout>

activity_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ListView
        android:id="@+id/lv_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:listSelector="@drawable/list_item"></ListView>
</LinearLayout>

结果：