问android中intent后的空指针

EN

package com.example.uniapp;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class SplashScreen extends Activity {
Button next;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

next = (Button) findViewById(R.id.button);



next.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {

Intent intent = new Intent(SplashScreen.this,Description.class);
        startActivity(intent);
        finish();


    }
});

}
///////////////////////////////////////////////////////////////some function this functions is not use
public int testdb()
{
    int count = 0;
    SQLiteDatabase mydb;
    try {
        Toast.makeText(SplashScreen.this, "asdasddasds", Toast.LENGTH_LONG).show();
        MyDatabase MyDataBase = new MyDatabase(this);
        mydb = MyDataBase.getReadableDatabase();
        Cursor cursor = mydb.rawQuery("SELECT * FROM news",null);
        cursor.moveToFirst();
        cursor.moveToNext();
        String TempTest = cursor.getString(cursor.getColumnIndex("title"));
        if(!TempTest.equals(""))
            count = 5;
        if(cursor != null)
        {
            //cursor.moveToFirst();
            count = cursor.getInt(0);
            Toast.makeText(getApplicationContext(), "null!!!!!!!!!!"  , Toast.LENGTH_LONG).show();
        }



        cursor.close();
        mydb.close();
        Toast.makeText(getApplicationContext(), "database 11 done : " + count , Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        // TODO: exception daa base
        Toast.makeText(getApplicationContext(), "data error 1 : " + 0, Toast.LENGTH_LONG).show();
    }
    return count;
}

package com.example.uniapp;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;



public class Description extends DrawableNav implements OnItemClickListener {

int drawableposition;
MyArray myarray;
MyDatabase MyDataBase;
SQLiteDatabase mydb;
int count = 0;
ListView MyList;
TextView showInfo;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    //////////////////////////////////////////////////////////////////////////////////////////////////*inflaste layout
    LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    //inflate your activity layout here!
    View contentView = inflater.inflate(R.layout.newdescription, null, false);
    mDrawerLayout.addView(contentView, 0);


    //////////////////////////////intilitize list view
    MyList = (ListView)findViewById(R.id.list);
    showInfo = (TextView) findViewById(R.id.show_uniInfo);

    //////////////////////////////get intent
    //Intent intent = getIntent();
    //count = intent.getIntExtra("db", 0);





}
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<cases
public void SelectItem(int possition) {

    drawableposition = possition;
    if(possition != 0)
        showInfo.setVisibility(View.GONE);
    switch (possition) {

    case 0 :

        System.out.println("<<<<<<<<<<<<<<<<<<<test for exception");
        showInfo.setVisibility(View.VISIBLE); ///get null pointer here by all codes

        break;
   case 1:
          ////////////// codes work well
   break;
     }
  }
}

if (savedInstanceState == null) {
           SelectItem(0);
}