运行后黑屏求助，大神门谁知道问题在哪里啊 ？

Question

这是java代码：

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Adapter;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.GridView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener{

private GridView gridView;

private List<Map<String, Object>> dataList;

private int[] icon = {R.drawable.address_book,R.drawable.calendar,R.drawable.camera,

R.drawable.clock,R.drawable.games_control,R.drawable.messenger,R.drawable.ringtone,

R.drawable.settings,R.drawable.speech_balloon,R.drawable.weather,

R.drawable.world,R.drawable.youtube};

private String [] iconName = {"地址簿","日历","相机","闹铃","游戏","信息","音乐","设置","通讯录","天气","互联网","YouTube"};

private SimpleAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

gridView=(GridView) findViewById(R.id.gridView);

//1.主被数据源

//2.新建适配器（simpleAdapter）

//3.GridView加载适配器

//4.GridView配置事件监听器（OnItemClickListener）

dataList = new ArrayList<Map<String,Object>>();

getData();

adapter = new SimpleAdapter(this, getData(), R.layout.item, new String[]{"pic","text"}, new int[]{R.id.pic,R.id.text});

gridView.setAdapter(adapter);

}

private List<Map<String, Object>> getData() {

for (int i=1;i<icon.length;i++){

Map<String, Object>map= new HashMap<String, Object>();

map.put("pic", icon[i]);

map.put("text", iconName[i]);

}

return dataList;

}

@Override

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

// TODO Auto-generated method stub

Toast.makeText(this, "我是"+iconName[position], Toast.LENGTH_SHORT).show();

}

}

这是xml配置文件：

<?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"

    android:gravity="center" 

    android:background="#000000">

    

    <ImageView 

        android:id="@+id/pic"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        />

    <TextView

        android:id="@+id/text"

        android:layout_marginTop="5dp"

        android:textColor="#ffffff"

        android:text="文字"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        />

</LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.android_gridview.MainActivity" >

    

    <!--

    android:numColumns="3"         每一行显示多少列

        android:horizontalSpacing="" 两列之间的间距

        android:verticalSpacing="" 两行之间的间距

    -->

    <GridView

        android:id="@+id/gridView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:horizontalSpacing="10dp"

        android:verticalSpacing="10dp"

        android:numColumns="3" >

    </GridView>

</RelativeLayout>