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I have created an app to fetch the contact list after getting logged in, But after Log in the app is getting stopped instead of opening ContactActivity.java
here is my LOGCAT and the ContactActivity Code. please someone help...

i tried to resolve the problem but didn't get success

LOGCAT:

W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@45289e1
I/Timeline: Timeline: Activity_launch_request time:145293352 intent:Intent cmp=com.delaroystudios.sqlitelogin/com.delaroystudios.filterContacts.activities.ContactActivity 
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.delaroystudios.sqlitelogin, PID: 26883
 java.lang.RuntimeException: Unable to instantiate activity ComponentInfocom.delaroystudios.sqlitelogin/com.delaroystudios.filterContacts.activities.ContactActivity: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2625)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2784)
 at android.app.ActivityThread.-wrap12(ActivityThread.java)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:163)
 at android.app.ActivityThread.main(ActivityThread.java:6238)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
 at android.app.Activity.findViewById(Activity.java:2401)
 at com.delaroystudios.filterContacts.activities.ContactActivity.<init>(ContactActivity.java:26)
 at java.lang.Class.newInstance(Native Method)
 at android.app.Instrumentation.newActivity(Instrumentation.java:1079)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2615)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2784) 
 at android.app.ActivityThread.-wrap12(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:163) 
 at android.app.ActivityThread.main(ActivityThread.java:6238) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823) 
I/Process: Sending signal. PID: 26883 SIG: 9
Application terminated.

contact_list_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@color/colorPrimaryDark">

<ListView
 android:id="@+id/list"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

</ListView>

</LinearLayout>

ContactActivity.java

package com.delaroystudios.filterContacts.activities;

import android.app.ListActivity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

import android.provider.ContactsContract;
import android.widget.Toast;

import com.delaroystudios.sqlitelogin.R;

import java.util.ArrayList;

public class ContactActivity extends ListActivity 

 ListView lv = (ListView) findViewById(R.id.list);
 Cursor cursor;

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


 cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
 startManagingCursor(cursor);

 String from = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.CommonDataKinds.Phone._ID;
 int to = android.R.id.text1, android.R.id.text2;

 SimpleCursorAdapter listAdapter = new SimpleCursorAdapter(this,android.R.layout.simple_expandable_list_item_2,cursor,from,to);
 setListAdapter(listAdapter);

 lv = getListView();
 lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

 

 @Override
 public long getSelectedItemId() 
 return super.getSelectedItemId();
 

 @Override
 public int getSelectedItemPosition() 
 return super.getSelectedItemPosition();
 

 @Override
 public boolean onCreateOptionsMenu(Menu menu) 
 return super.onCreateOptionsMenu(menu);