Vfrdtyky

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 ComponentInfo{com.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);

    }

}