// 通过Activity获取

LayoutInflaterinflater=getLayoutInflater();



// 通过静态方法获取

LayoutInflaterinflater=LayoutInflater.from(context);



// 通过系统服务获取

LayoutInflaterinflater= (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

<?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:gravity="center_vertical">

    <ImageView
        android:id="@+id/letter_img"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:padding="5dp"
        android:src="@mipmap/ic_launcher"/>

    <TextView
        android:id="@+id/content_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:textColor="#b6400e"/>
</LinearLayout>

package com.jinyu.cqkxzsxy.android.listviewsample.adapter;

import android.app.Activity;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.jinyu.cqkxzsxy.android.listviewsample.R;

/**
 * @创建者 鑫鱻
 * @描述 Android零基础入门到精通系列教程，欢迎关注微信公众号ShareExpert
 */
public class MyArrayAdapter extends ArrayAdapter {
    private Activity mContext = null; // 上下文环境
    private int mResourceId; // 列表项布局资源ID
    private String[] mItems; // 列表内容数组

    public MyArrayAdapter(Activity context, int resId, String[] items){
        super(context, resId, items);
        // 保存参数
        mContext = context;
        mResourceId = resId;
        mItems = items;
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // 获取LayoutInflater对象
        LayoutInflater inflater = mContext.getLayoutInflater();
        // 装载列表项视图
        View itemView = inflater.inflate(mResourceId, null);

        // 获取列表项之组件
        TextView contentTv = (TextView) itemView.findViewById(R.id.content_tv);
        ImageView letterImg = (ImageView) itemView.findViewById(R.id.letter_img);

        // 取出要显示的数据
        String content = mItems[position].trim();

        // 给TextView设置显示值
        contentTv.setText(content);
        // 根据内容首字母判断要显示的图标
        if(content.startsWith("a") || content.startsWith("A")) {
            letterImg.setImageResource(R.drawable.letter_a);
        } else if(content.startsWith("b") || content.startsWith("B")) {
            letterImg.setImageResource(R.drawable.letter_b);
        } else if(content.startsWith("c") || content.startsWith("C")) {
            letterImg.setImageResource(R.drawable.letter_c);
        } else if(content.startsWith("d") || content.startsWith("D")) {
            letterImg.setImageResource(R.drawable.letter_d);
        } else if(content.startsWith("e") || content.startsWith("E")) {
            letterImg.setImageResource(R.drawable.letter_e);
        }

        // 返回列表项视图
        return itemView;
    }
}

package com.jinyu.cqkxzsxy.android.listviewsample;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;

import com.jinyu.cqkxzsxy.android.listviewsample.adapter.MyArrayAdapter;

public class CustomArrayAdapterActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.custom_arrayadapter_layout);

        // 获取界面组件
        ListView listView = (ListView) findViewById(R.id.listview);

        // 定义要显示的数组
        String[] contents = {"Android", "demo", "Edit", "APP", "excel",
                "dota", "Button", "Circle", "excel", "back"};

        // 将数组包装为自定义MyArrayAdapter
        MyArrayAdapter adapter = new MyArrayAdapter(this, R.layout.custom_arrayadapter_item, contents);

        // 为ListView设置Adapter
        listView.setAdapter(adapter);
    }
}