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                        /Android攻城獅的第二門課（第1季）

arrayadpter有錯誤

源代碼如下：

package com.example.androidarrayadapter;

import android.support.v7.app.ActionBarActivity;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

@SuppressLint("NewApi")
public class MainActivity extends Activity {
?private ListView listView;
?private ArrayAdapter<String> arr_adapter;
?private SimpleAdapter sim_adapter;
?@Override
?protected void onCreate(Bundle savedInstanceState) {
??super.onCreate(savedInstanceState);
??setContentView(R.layout.main);
??listView=(ListView) findViewById(R.id.listView);
??//1.新建一個數據適配器
??//ArrayAdapter(上下文，當前listview加載的每一個列表項代表的布局文件，數據源?? )
??//2.適配器加載數據源
??String[]arr_data={"慕課網1","慕課網2","慕課網3","慕課網4"};
??arr_adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arr_data);
??//3.視圖加載適配器
??listView.setAdapter(arr_adapter);
?}
}