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I am creating a application with preference activity where the listpreference entries are problematically assigned. This application works fine on my emulator but while i test my application in mobile it shows error like this FATAL EXCEPTION: main java.lang.NullPointerException at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) at android.widget.AbsListView.obtainView(AbsListView.java:2033) This problem arises when i click that listpreference in my mobile. here this is my code prference.xml <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <PreferenceCategory android:title="@string/settings"> <ListPreference android:key="@string/resolution" android:title="@string/imageres" android:summary="@string/summaryres" android:dialogTitle="@string/resFormat" /> </PreferenceCategory> </PreferenceScreen> settings.java package com.example; import android.database.Cursor; import android.os.Bundle; import android.preference.ListPreference; import android.preference.PreferenceActivity; public class Settings extends PreferenceActivity { private SQLiteoperations SQLiteAdapter; DTO get; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); get = (DTO) getIntent().getExtras().get("obj"); SQLiteAdapter = new SQLiteoperations(this); SQLiteAdapter.openToWrite(); addPreferencesFromResource(R.xml.preferences); ListPreference pref = (ListPreference) findPreference("resolution"); pref.setEntries(getEntries()); pref.setEntryValues(getEntries()); System.out.println("after set entries"); System.

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