CODEWITHSUNDEEP
androidnullpointerexceptionandroid-edittextsharedpreferences
VaM999
VaM999

Reputation: 471

EditText Method invocation may produce java.lang.NullpointerException

First and foremost , I have read the questions with the same title as mine here;

So please go through the question once. I am developing an application that takes values from a shared preference file and puts those values in EditText fields, for this I have used setText() method. I keep getting this warning in android studio. I realize this is just a warning , but I would like to know

  1. What causes this?
  2. How to rectify this?

Code is as follows:

    EditText sil_key = (EditText)findViewById(R.id.silent_key);
    EditText gen_key = (EditText)findViewById(R.id.general_key);
    EditText vib_key = (EditText)findViewById(R.id.vibrate_key);
    SharedPreferences sharedPreferences = getSharedPreferences(getString(R.string.preference_file_key),MODE_PRIVATE);
    sil_key.setText(sharedPreferences.getString("silent","silent"));
    gen_key.setText(sharedPreferences.getString("general","general"));
    vib_key.setText(sharedPreferences.getString("vibrate","vibrate"));

And lastly I get the same warning with getText() used with EditText;Why? and How to rectify?

Upvotes: 0

Views: 1323

Answers (2)

Naina
Naina

Reputation: 97

Declare EditText in class level and then initialize further in onCreate(). this would solve your problem.

class Test extends AppCompactActivity{

private EditText sil_key;

onCreate(){

...

sil_key = (EditText)findViewById(R.id.silent_key);

SharedPreferences sharedPreferences = getSharedPreferences(getString(R.string.preference_file_key),MODE_PRIVATE);
    sil_key.setText(sharedPreferences.getString("silent","silent"));

...
    }
 }

You can refer to this link as answer given by @Rod_Algonquin. it gives you a reason for this.

EditText.setText() Null Pointer Exception

Upvotes: 1

Max
Max

Reputation: 155

Your question is a duplicate as if you read some answers such as here (as linked by @Ironman). The warning states

This is no error, it is just a warning. The static analyzer cannot deduce that your EditText or the result from EditText.getText() isn't null. The keyword here is 'may'.

Adding a (possibly unnecessary) null-check for both instances will make the warning disappear.

As Answered by @nhaarman in the linked question.

Upvotes: 0

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