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In graph i plot value from calling api. I have display this graph in fragment class and when I change the orientation app will crash. How can I change orientation and display image in landscape mode without crashing an app.

Waliul Islam Alif
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user2273146
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  • Can you share the error message you get when the app crashes? – Rachit Sep 21 '16 at 04:55
  • @Rachit the terminal provide this error Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference. – user2273146 Sep 21 '16 at 04:57

2 Answers2

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When the orientation change then the state of fragment will be changed. You need to save the state of your fragment by calling

setRetainInstance(true);

in onCreate() method.

You can also use onRestoreInstanceState() method which will store your savedInstanceState 

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    onCreate(savedInstanceState);
}

The best solution is just add 

android:configChanges="orientation|screenSize|keyboardHideen"

for your activity which holds the fragment in your manifest file.

Piyush
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  • @user2273146 follow this... also One more solution make a xml in landscape and put in layout-land make sure ids are same to this layout..... – Arjun saini Sep 21 '16 at 05:04
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During orientation changes, android destroys your activity. Maybe you set something and it became invalid during that change. You can read more about it here: https://developer.android.com/guide/topics/resources/runtime-changes.html

You said you want to be able to change the orientation. Just for completeness, you can fix the orientation to landscape or portrait, see: Android - disable landscape mode?

Community
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Cubicle257
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