android空指针异常，求大神指教，已纠结好几天了。。。

Question

package com.rong.shop.myshop.home;

import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.SimpleAdapter;

import com.rong.shop.R;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**

• Created by Administrator on 2016/8/13.
  */
  public class MyFragment_home extends Fragment {

  //ViewPager
  private ViewPager vpager_one;
  private ArrayList aList;
  private Adapter_homeViewPager mAdapter;

  //GridView
  private GridView gridview;
  private ImageView imageview;
  private Context mcontext = this.getActivity();
  private List> listitem;
  private SimpleAdapter gAdapter;
  private int[] imgIds;

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  View view = inflater.inflate(R.layout.fg_home, container, false);

  //ViewPager
  vpager_one = (ViewPager) view.findViewById(R.id.vpager);
  
  aList = new ArrayList<View>();
  LayoutInflater li = getLayoutInflater(null);
  aList.add(li.inflate(R.layout.fg_home_viewpager_view_1, null, false));
  aList.add(li.inflate(R.layout.fg_home_viewpager_view_2, null, false));
  aList.add(li.inflate(R.layout.fg_home_viewpager_view_3, null, false));
  aList.add(li.inflate(R.layout.fg_home_viewpager_view_4, null, false));
  aList.add(li.inflate(R.layout.fg_home_viewpager_view_5, null, false));
  
  mAdapter = new Adapter_homeViewPager(aList);
  vpager_one.setAdapter(mAdapter);
  
  //GridView
  gridview = (GridView)view.findViewById(R.id.gridview);
  
  listitem= new ArrayList<>();
  imgIds = new int[]{
          R.drawable.fg_home_gridview_1, R.drawable.fg_home_gridview_2,
          R.drawable.fg_home_gridview_3, R.drawable.fg_home_gridview_4,
          R.drawable.fg_home_gridview_5, R.drawable.fg_home_gridview_6,
          R.drawable.fg_home_gridview_7, R.drawable.fg_home_gridview_8,
  };
  for (int i = 0; i < imgIds.length; i++) {
      Map<String, Object> showitem = new HashMap<String, Object>();这里是第七十行报错的代码
      showitem.put("image", imgIds[i]);
      listitem.add(showitem);
  }
  
  gAdapter = new SimpleAdapter(mcontext, listitem, R.layout.fg_home_gridview_item,
          new String[] { "image" }, new int[]{R.id.gridview_image});
  gridview.setAdapter(gAdapter);
  
  return view;
  

  }
  }

报错信息是
Caused by: java.lang.NullPointerException

at com.rong.shop.myshop.home.MyFragment_home.onCreateView(MyFragment_home.java:70)

Answer 1

最好把你的日志全部忒出来，Map itemMap = new HashMap();这句是没有语法错误的