NullPointerException on going to another activity, android studio

NullPointerException on going to another activity, android studio

I'm really new to android programming and xml and such. I wrote this
program and took a lot of help by reading other people's questions and
answers in stackoverflow. Here, I'm really stuck. As I don't have a
thorough understanding of the mechanics of this, I can't really understand
what I'm doing wrong.
I'm stuck on this for 2 days and although I understood there is something
wrong with inflation but I don't get where is wrong or what should I do,
any help is really appreciated.
package com.rocrider.foodmenue;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Done done = new Done();
Button Bdone = (Button) findViewById(R.id.Bdone);
Bdone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
done.BDone();
startActivity(new Intent(MainActivity.this, Done.class));
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
this was my main class
package com.rocrider.foodmenue;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class Done extends MainActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity);
}
public void BDone(){
EditText Tfood1amount = (EditText) findViewById(R.id.TFood1Amount);
EditText Tfood2amount = (EditText) findViewById(R.id.TFood2Amount);
ListView lvlast = (ListView) findViewById(R.id.LVfinal);
final ArrayList<String> OrderList = new ArrayList<String>();
final ArrayAdapter<String> adapter;
int food1amount = 0;
int food2amount = 0;
food1amount = Integer.parseInt(String.valueOf(Tfood1amount.getText()));
food2amount = Integer.parseInt(String.valueOf(Tfood2amount.getText()));
adapter = new ArrayAdapter<String>(this,R.id.LVfinal,OrderList);
lvlast.setAdapter(adapter);
if(food1amount != 0){
class alaki{
public void adder(View v){
OrderList.add("Food1: ");
adapter.notifyDataSetChanged();
}
}
}
if(food2amount != 0){
class alaki{
public void adder(View v){
OrderList.add("Food2: ");
adapter.notifyDataSetChanged();
}
}
}
}
}
this was my second class.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rocrider.foodmenue"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.rocrider.foodmenue.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Done"/>
</application>
</manifest>
my android manifest file and here comes the logcat
09-28 11:36:01.339 9089-9089/com.rocrider.foodmenue E/AndroidRuntime©s
FATAL EXCEPTION: main java.lang.NullPointerException at
android.app.Activity.findViewById(Activity.java:1647) at
com.rocrider.foodmenue.Done.BDone(Done.java:29) at
com.rocrider.foodmenue.MainActivity$1.onClick(MainActivity.java:35) at
android.view.View.performClick(View.java:2485) at
android.view.View$PerformClick.run(View.java:9080) at
android.os.Handler.handleCallback(Handler.java:587) at
android.os.Handler.dispatchMessage(Handler.java:92) at
android.os.Looper.loop(Looper.java:123) at
android.app.ActivityThread.main(ActivityThread.java:3687) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:507) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) at
dalvik.system.NativeStart.main(Native Method) 09-28 11:36:01.343 118-256/?
W/ActivityManager©s Force finishing activity
com.rocrider.foodmenue/.MainActivity 09-28 11:36:01.347 118-136/? E/©s
Dumpstate > /data/log/dumpstate_app_error
I really couldn't find the problem myself. Any help would be appreciated.
Thanks in advance