Spinner.setadapter on a null Object Reference

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The array of players is filled with the dice but gives error in the method setadapter. 

Spinner spinnerJogador1;

   ArrayList<JogadorModel> jogadores = jogadorRepository.SelecionarDisponiveis();

dataAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, jogadores);

        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);    
        // attaching data adapter to spinner
        spinnerJogador1.setAdapter(dataAdapter);
java android sql spinners
  • 1

    Hello, probably your spinner is null, please can post the error log ?

  • @Ultraseven put the Spinner code for easy help! D

  • 07-04 06:39:39.512 4198 4198 E Androidruntime FATAL EXCEPTION: main 07-04 06:39:39.512 4198 4198 E Androidruntime Process: com.mycompany.Marcatimevolei, PID: 4198 java.lang.Runtimeexception: Unable to start activity Log do erro: ComponentInfo{com.mycompany.MarcaTimeVolei/com.mycompany.MarcaTimeVolei.MontarDuplaActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Spinner.setAdapter(android.widget.SpinnerAdapter)' on a null Object Reference

  • Hello @Arthurcordovastapassoli, the error log is in the previous comment.

  • Hello @mauriciocaserta. The code is complete, I have not yet entered the code to capture the user’s choice.

  • @Ultraseven referred to the code referring to the "spinnerJogador1", could paste the code in which it assigns value to this variable?

  • @Ultraseven verified in debug whether the variable spinnerJogador1 is null ?

  • I entered the spinner declaration in the question.

  • @Rthur spinner is null.

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1 answer

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@Ultrasenven vc need to assign the spinnerGood1 the Spinner component you put in the view, so try:

sua_view.xml

<Spinner
    android:id="@+id/id_do_seu_spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

Suaactivity.java

Spinner spinnerJogador1 = (Spinner) findViewById(R.id.id_do_seu_spinner);

  • It worked! Thank you very much. I’m now searching how to capture the selected player id.

  • Cool, if you use a list can do inside his Adpter. Hug, if you can score the answer I thank you, hug!

  • Thank you. I use Adapter based on examples, but I confess that this subject is still very confusing for me, and unfortunately not only this but several others.

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