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PONull pointer exception in SharedPreferences Android
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copied!<p>This is my SharedPreference class : </p> <pre><code>public class MySharedPrefs { private static final String APP_SHARED_PREFS = "com.astroved.Horawatch"; private SharedPreferences appSharedPrefs; private Editor prefsEditor; public MySharedPrefs(Context context) { this.appSharedPrefs = context.getSharedPreferences(APP_SHARED_PREFS, Activity.MODE_PRIVATE); this.prefsEditor = appSharedPrefs.edit(); } public String getPrefsValue(String value) { return appSharedPrefs.getString(value, ""); } public void savePrefsValue(String key , String Value) { prefsEditor.putString(key, Value); prefsEditor.commit(); } public Boolean checkKey(String Key) { if(appSharedPrefs.contains(Key)) return true; else return false; } </code></pre> <p>}</p> <p>MyFunctionClass : </p> <pre><code>public class Functions_class extends Activity{ AstroVedTime tz,lat,lon; TimeZone tz1; protected MySharedPrefs appPrefs; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);{ appPrefs = new MySharedPrefs(Functions_class.this); } } public void user_informations(int myear,int mMonth, int mDay){ int year = myear,month = mMonth+1,day = mDay; Moment mn = new Moment(year,month,day,user_device_time()); //appPrefs = new MySharedPrefs(Functions_class.this); if(appPrefs.checkKey("City_name1")){ TimeZone.setDefault(TimeZone.getTimeZone(appPrefs.getPrefsValue("selected_time_zone"))); Log.v("LOG_TAG"+"here the error is : ", appPrefs.getPrefsValue("selected_lat")+""); Log.v("LOG_TAG", appPrefs.getPrefsValue("selected_longi")+""); tz1 = TimeZone.getDefault(); lat = new AstroVedTime(Double.parseDouble(appPrefs.getPrefsValue("selected_lat")));// Latitude lon = new AstroVedTime(Double.parseDouble(appPrefs.getPrefsValue("selected_longi")));// Longitude } </code></pre> <p>This is my <code>logcat</code> :</p> <pre><code> 08-10 14:07:14.947: E/AndroidRuntime(475): FATAL EXCEPTION: Thread-13 08-10 14:07:14.947: E/AndroidRuntime(475): java.lang.NullPointerException 08-10 14:07:14.947: E/AndroidRuntime(475): at com.astroved.horawatch.Functions_class.user_informations(Functions_class.java:46) 08-10 14:07:14.947: E/AndroidRuntime(475): at com.astroved.horawatch.HoraWatchActivity$13$1.run(HoraWatchActivity.java:1106) 08-10 14:07:16.628: E/WindowManager(475): Activity com.astroved.horawatch.HoraWatchActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@407f1950 that was originally added here 08-10 14:07:16.628: E/WindowManager(475): android.view.WindowLeaked: Activity com.astroved.horawatch.HoraWatchActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@407f1950 that was originally added here 08-10 14:07:16.628: E/WindowManager(475): at android.view.ViewRoot.<init>(ViewRoot.java:258) 08-10 14:07:16.628: E/WindowManager(475): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 08-10 14:07:16.628: E/WindowManager(475): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 08-10 14:07:16.628: E/WindowManager(475): at android.view.Window$LocalWindowManager.addView(Window.java:424) 08-10 14:07:16.628: E/WindowManager(475): at android.app.Dialog.show(Dialog.java:241) 08-10 14:07:16.628: E/WindowManager(475): at com.astroved.horawatch.HoraWatchActivity$13.onClick(HoraWatchActivity.java:1103) 08-10 14:07:16.628: E/WindowManager(475): at android.view.View.performClick(View.java:2485) 08-10 14:07:16.628: E/WindowManager(475): at android.view.View$PerformClick.run(View.java:9080) 08-10 14:07:16.628: E/WindowManager(475): at android.os.Handler.handleCallback(Handler.java:587) 08-10 14:07:16.628: E/WindowManager(475): at android.os.Handler.dispatchMessage(Handler.java:92) 08-10 14:07:16.628: E/WindowManager(475): at android.os.Looper.loop(Looper.java:123) 08-10 14:07:16.628: E/WindowManager(475): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-10 14:07:16.628: E/WindowManager(475): at java.lang.reflect.Method.invokeNative(Native Method) 08-10 14:07:16.628: E/WindowManager(475): at java.lang.reflect.Method.invoke(Method.java:507) 08-10 14:07:16.628: E/WindowManager(475): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-10 14:07:16.628: E/WindowManager(475): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-10 14:07:16.628: E/WindowManager(475): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I am getting the above error. I am doing some mistake in calling the <code>SharedPreference</code> values. I am not able to figure it out. Previously I get this error</p> <pre><code>at android.content.contextwrapper.getsharedpreferences contextwrapper.java 146 </code></pre> <p>I cleared the above error by calling <code>SharedPreferences</code> in <code>OnCreate</code>. How to clear the <code>Logcat</code> error shown above.Where I am wrong?</p> <p>I am calling the method in the MyFunctionClass during the onclick of my Another activity.Its shown below</p> <p>HoraWatchActivity :</p> <pre><code>public Functions_class func_cls = new Functions_class(); private OnClickListener show_panchang_page = new OnClickListener(){ public void onClick(View v) { pbarDialog = new ProgressDialog( HoraWatchActivity.this ); pbarDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); pbarDialog.setMessage("Loading Panchang..."); pbarDialog.show(); Thread t = new Thread(){ public void run(){ func_cls.user_informations(mYear, mMonth, mDay); Message myMessage=new Message(); Bundle resBundle = new Bundle(); resBundle.putString("status", "SUCCESS"); myMessage.obj=resBundle; handler.sendMessage(myMessage); } }; t.start(); } }; </code></pre> <p>Quicker response will helps me a Lot.Thanks.</p>

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