CODEWITHSUNDEEP
androidtextview
DavidOli
DavidOli

Reputation: 105

getLineStart() always return null for my TextView?

I have a TextView and I want to get some specific line's text of it but when I use txt.getLayout.getLineStart(1) it returns null and crashes the app, what is the reason?

TextView txt = (TextView)mRootView.findViewById(R.id.txt);
int start = txt.getLayout().getLineStart(1);
int end =  txt.getLayout().getLineEnd(1);
String first = txt.getText().subSequence(start,end).toString();

Crash log

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.sattva.animalsencyclopedia, PID: 11244
                  java.lang.NullPointerException
                      at com.sattva.animalsencyclopedia.fragments.FragmentInformation.onViewCreated(FragmentInformation.java:110)
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
                      at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
                      at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
                      at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
                      at android.os.Handler.handleCallback(Handler.java:808)
                      at android.os.Handler.dispatchMessage(Handler.java:103)
                      at android.os.Looper.loop(Looper.java:193)
                      at android.app.ActivityThread.main(ActivityThread.java:5333)
                      at java.lang.reflect.Method.invokeNative(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:515)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
                      at dalvik.system.NativeStart.main(Native Method)

Upvotes: 0

Views: 838

Answers (1)

kostyabakay
kostyabakay

Reputation: 1689

Probably you didn't find this view using findViewById() method in correct way. You are using fragment and probable you have something like getActivity().findViewById(). Try in your onCreateView() method do something like this view.findViewById(), where view is the result of inflating.

As @pskink mentioned from the docs: returns Layout the Layout that is currently being used to display the text. This can be null if the text or width has recently changes. Try to call this code in onStart or onCreate method, but you should make a txt as a class member variable.

int start = txt.getLayout().getLineStart(1);
int end =  txt.getLayout().getLineEnd(1);
String first = txt.getText().subSequence(start,end).toString();

Upvotes: 1

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