App runs fine on avd but not on actual device

manpreet Best Answer 2 years ago

I'm kind of new to android, actually this is my first app. The app is not completed through, i wanted to test the UI, it works fine on AVD, but when I copy the .apk file from bin folder to my phone, it installs fine, but wont work ends up with force close error. I have no idea what's the problem, I saw on other post about parsing the content in edittext, i took out the layout and ran it again still not working. again, I am new to this, please help me.

Mainactivity.java

package com.example.studentapp;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;

import com.example.studentapp.ExpandableListAdapter;

import android.widget.Toast;

 public class MainActivity extends ActionBarActivity {

    DrawerLayout mDrawerLayout;
    ExpandableListView mDrawerList;
    ExpandableListAdapter listAdapter;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;
    private ActionBarDrawerToggle actionBarDrawerToggle;

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

        getfragment
                                                

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