nullpointerexception

[Solved] Android – java Cloud Firestore : NullPointerException when converting data toObject [duplicate]

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The UserSettings class has a constructor that looks like this: public UserSettings(ArrayList<User> mUser, ArrayList<UserAccountSettings> mSettings){ } This constructor doesn’t set the user and settings variables defined in this class and it is the constructor you use to create the return value of the getUserSettings method. return new UserSettings(mUser, mSettings ); // `mUser` and `mSettings` are … Read more

[Solved] running application it’s showing this error in android

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Use URLEncoder to encode your URL params such as student_name[k] and roll_no[k]: final String queryString = “student_name=” + URLEncoder.encode(student_name[k], “UTF-8”) + “&roll_no=”+ URLEncoder.encode(roll_no[k], “UTF-8″); Use equals() and not == or != for comparing Strings: if(!””.equals(queryString)) 2 solved running application it’s showing this error in android

[Solved] How to resolve NullPointerException in SharedPreference? [duplicate]

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The most likely cause is because the fragment has not yet attached to the activity. You need to call getActivity() in the fragment’s onActivityCreated() method. void onActivityCreated (Bundle savedInstanceState){ //call getActivity() here } solved How to resolve NullPointerException in SharedPreference? [duplicate]

[Solved] What does null pointer exception mean in error messages? [duplicate]

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Java doesn’t use pointers, but uses references. NullPointerException is a way to say that an attempt is made to send a message (invoke a method) using reference which doesn’t point to any object. It has nothing to do with pointers in the sense of C/C++. solved What does null pointer exception mean in error messages? … Read more

[Solved] android studio : findViewById return NULL Pointer [duplicate]

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<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android” xmlns:tools=”http://schemas.android.com/tools” android:layout_width=”match_parent” android:layout_height=”match_parent” android:paddingBottom=”@dimen/activity_vertical_margin” android:paddingLeft=”@dimen/activity_horizontal_margin” android:paddingRight=”@dimen/activity_horizontal_margin” android:paddingTop=”@dimen/activity_vertical_margin” tools:context=”bd2c.bd2c_appdemo.MainActivity”> <TextView android:id=”@+id/principal” android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:text=”@string/app_text” /> </RelativeLayout> This is your fixed layout select all copy that and go to your layout select all and paste this. Bingo 🙂 solved android studio : findViewById return NULL Pointer [duplicate]

[Solved] After changing the package name application giving error ” java.lang.NullPointerException: Attempt to get length of null array” [duplicate]

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After changing the package name application giving error ” java.lang.NullPointerException: Attempt to get length of null array” [duplicate] solved After changing the package name application giving error ” java.lang.NullPointerException: Attempt to get length of null array” [duplicate]

[Solved] app crashing because of ‘Caused by: java.lang.NullPointerException’ error [closed]

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Hey you are are getting exception on something like this code your_toggle_button.setChecked(true); The above code is in other class rather than your_toggle_button activity because you can’t touch your activity’s child if the activity is not running, to achieve this you will have to save your value in some variable and send it through intent when … Read more

[Solved] Null Pointer Exception on SimpleDateFormat parse [duplicate]

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String dateStr = “04/05/2010”; SimpleDateFormat curFormater = new SimpleDateFormat(“dd/MM/yyyy”); try { dateObj = curFormater.parse(dateStr); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } SimpleDateFormat postFormater = new SimpleDateFormat(“MMMM dd, yyyy”); String newDateStr = postFormater.format(dateObj); Toast.makeText(getApplicationContext(), newDateStr, 1).show(); 1 solved Null Pointer Exception on SimpleDateFormat parse [duplicate]

[Solved] Strange behavior of ItemStack

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This has tripped people up more than once. Doors are two-component items. ACACIA_DOOR represents the top-part of the door, while ACACIA_DOOR_ITEM represents the bottom-part and also the item id. Use ACACIA_DOOR_ITEM when creating an ItemStack. Tip: If you are unsure about an item id, launch Minecraft in creative mode and enable Advanced Tooltips by pressing … Read more