从可扩展列表视图适配器内启动新活动

Question

我已经将我在线上找到的自定义可扩展列表视图集成到了我正在处理的项目中。我遇到的问题是从可扩展列表视图适配器中调用新的活动。以下是适配器代码的一部分。当调用context.startActivity（）时，我得到一个空的异常错误。

如何调用一个新的活动

package com.example.apple; 

import java.util.ArrayList; 

import android.app.Activity; 
import android.content.Context; 

@SuppressWarnings("unchecked") 
public class NewAdapter extends BaseExpandableListAdapter { 

public ArrayList<String> groupItem, tempChild; 
public ArrayList<String> childDateTime; 
public ArrayList<Object> Childtem = new ArrayList<Object>(); 
public LayoutInflater minflater; 
public Activity activity; 
private Context context; 

public NewAdapter(ArrayList<String> grList, ArrayList<Object> childItem, ArrayList<String> childDT) { 
    groupItem = grList; 
    this.Childtem = childItem; 

    childDateTime = childDT; 
} 

public NewAdapter(Context context) { 
    this.context = context;  
} 

public void setInflater(LayoutInflater mInflater, Activity act) { 
    this.minflater = mInflater; 
    activity = act; 
} 

@Override 
public Object getChild(int groupPosition, int childPosition) { 
    return null; 
} 

@Override 
public long getChildId(int groupPosition, int childPosition) { 
    return 0; 
} 

@Override 
public View getChildView(int groupPosition, final int childPosition, 
    boolean isLastChild, View convertView, ViewGroup parent) { 
    tempChild = (ArrayList<String>) Childtem.get(groupPosition); 
    TextView text = null; 
    if (convertView == null) { 
    convertView = minflater.inflate(R.layout.activity_main_child, null); 
    } 
    text = (TextView) convertView.findViewById(R.id.textView1); 
    text.setText(tempChild.get(childPosition)); 

    TextView dateTime = null; 
    dateTime = (TextView) convertView.findViewById(R.id.textDateTime); 
    dateTime.setText(childDateTime.get(groupPosition)); 

    convertView.setOnClickListener(new OnClickListener() { 

@Override 
    public void onClick(View v) { 

     Intent intent= new Intent(context, ViewSomeStuff.class); 

     context.startActivity(intent); 
    } 
    }); 
    return convertView; 
} 

Answer 1

public NewAdapter(Context context, ArrayList<String> grList, ArrayList<Object> childItem, ArrayList<String> childDT) { 
    groupItem = grList; 
    this.Childtem = childItem; 

    childDateTime = childDT; 
    this.context = context; 
}