Activity closes when calling the OnCreate method to create Spinner

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Activity closes when calling the OnCreate method to create Spinner

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I have a Spinner that if I invoke the method of creating it in OnCreate, the program closes abruptly. I think it should be something null or some variable from another scope, because if I call the method of creating Spinner in the submit button method, it goes normal.

Another thing, is that when the guys on youtube do the identification of some xml component by id, they do it inside the OnCreate, but if I do this and call my method to capture the values of an Editext, it closes, to bypass, I identify it within the same capture method.

I would like to know more about this OnCreate method, and whether it is important to identify the elements within it or capture within the same OnCreate.

My Code:

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    meuperfil=(Button) findViewById(R.id.button);
    avaliarcard=(Button) findViewById(R.id.button2);
    info=(Button) findViewById(R.id.button3);
    montarcard=(Button) findViewById(R.id.button4);
    submit=(Button) findViewById(R.id.submit);
    voltar=(Button) findViewById(R.id.voltar);
    idade=(EditText) findViewById(R.id.editIdade);
    addItemsOnSpinner2();
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}

 public void addItemsOnSpinner2() {
    nivel=(Spinner) findViewById(R.id.spinner);
    String[]list={"0","1","2","3","4"};
    ArrayAdapter<String> dataAdapter;
    dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
    nivel.setAdapter(dataAdapter);
}

//Se chamo o método AddItemsOnSpinner2 no método submeter ele vai normal 
public void submeter(View view){
    masculino=(CheckBox) findViewById(R.id.masculino);
    feminino=(CheckBox) findViewById(R.id.feminino);
    peso=(EditText) findViewById(R.id.editPeso);
    altura=(EditText) findViewById(R.id.edtAlt);
    /*Se não identifico os elementos aq, não é possível executar os comandos
    abaixo*/
    if(masculino.isChecked() && feminino.isChecked()) Toast.makeText(MainActivity.this,
            "Você deve selecionar somente uma opção para sexo", Toast.LENGTH_LONG).show();
    else{
        Toast.makeText(this, "seu peso eh " + peso.getText() + "sua altura eh " + altura.getText() +
                "seu esporte eh " + nivel.getSelectedItem(), Toast.LENGTH_LONG).show();
    }

Logcat:

12-26 23:05:10.330 1385-1385/com.clicks.lucas.clicks E/AndroidRuntime: FATAL EXCEPTION: main
                                                                       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.clicks.lucas.clicks/com.clicks.lucas.clicks.MainActivity}: java.lang.NullPointerException

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)

at android.app.ActivityThread.access$600(ActivityThread.java:130)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)

at android.os.Handler.dispatchMessage(Handler.java:99)

at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:4745)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

at dalvik.system.NativeStart.main(Native Method)
                                                                        Caused by: java.lang.NullPointerException

at com.clicks.lucas.clicks.MainActivity.addItemsOnSpinner2(MainActivity.java:106)

at com.clicks.lucas.clicks.MainActivity.onCreate(MainActivity.java:54)

at android.app.Activity.performCreate(Activity.java:5008)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 

at android.app.ActivityThread.access$600(ActivityThread.java:130) 

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 

 at android.os.Handler.dispatchMessage(Handler.java:99) 

at android.os.Looper.loop(Looper.java:137) 

 at android.app.ActivityThread.main(ActivityThread.java:4745) 

 at java.lang.reflect.Method.invokeNative(Native Method) 

at java.lang.reflect.Method.invoke(Method.java:511) 

 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 

                                                                           at dalvik.system.NativeStart.main(Native Method)

My xml:

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="120dp"
        android:layout_height="126dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        app:srcCompat="@drawable/icon"
        tools:layout_editor_absoluteX="103dp"
        tools:layout_editor_absoluteY="100dp" />

    <EditText
        android:id="@+id/edtAlt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editPeso"
        android:ems="10"
        android:hint="Altura em cm"
        android:inputType="number"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="35dp" />

    <EditText
        android:id="@+id/editPeso"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/masculino"
        android:ems="10"
        android:hint="Peso em kg"
        android:inputType="number"
        tools:layout_editor_absoluteX="53dp"
        tools:layout_editor_absoluteY="204dp" />

    <EditText
        android:id="@+id/editIdade"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/edtAlt"
        android:ems="10"
        android:hint="Idade"
        android:inputType="number"
        tools:layout_editor_absoluteX="53dp"
        tools:layout_editor_absoluteY="204dp" />

    <Button
        android:id="@+id/voltar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:onClick="voltar"
        android:text="Voltar" />

    <CheckBox
        android:id="@+id/masculino"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/textView2"
        android:text="Masculino" />

    <CheckBox
        android:id="@+id/feminino"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/masculino"
        android:layout_alignBottom="@+id/masculino"
        android:layout_alignEnd="@+id/editPeso"
        android:layout_alignRight="@+id/editPeso"
        android:layout_marginEnd="11dp"
        android:layout_marginRight="11dp"
        android:text="Feminino" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/imageView2"
        android:text="Qual o seu sexo?"
        android:textColor="#000000"
        android:textSize="16dp" />

    <Button
        android:id="@+id/submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/nivelexercicios"
        android:layout_marginTop="12dp"
        android:onClick="submeter"
        android:text="Enviar" />

    <CheckBox
        android:id="@+id/sim"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/perderpeso"
        android:text="Sim" />

    <CheckBox
        android:id="@+id/nao"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_below="@+id/perderpeso"
        android:layout_toLeftOf="@+id/feminino"
        android:layout_toStartOf="@+id/feminino"
        android:text="Não" />

    <TextView
        android:id="@+id/perderpeso"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editIdade"
        android:text="Deseja perder peso?"
        android:textColor="#000000"
        android:textSize="16dp" />

    <TextView
        android:id="@+id/ganharmusc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_below="@+id/editIdade"
        android:layout_marginLeft="12dp"
        android:layout_marginStart="12dp"
        android:layout_toEndOf="@+id/perderpeso"
        android:layout_toRightOf="@+id/perderpeso"
        android:text="Deseja ganhar Músculos?"
        android:textColor="#000000"
        android:textSize="16dp" />

    <TextView
        android:id="@+id/nivelexercicios"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/sim"
        android:text="Defina em uma escala de 0-4 a quantidade de esporte que pratica?"
        android:textColor="#000000"
        android:textSize="16dp" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="220dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/nivelexercicios"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="406dp" />

</RelativeLayout>

java android

asked by anonymous 26.12.2017 / 23:52

1 answer

Addressing subdomain (htaccess) to CodeIgniter error while loading a ProgressRing (Mahapps)

score 0 · Answer 1

0

The Spinner Creation Code was correct. The mistake is that it was called in a method that did not see the layout I created. It was just giving a setContentView that resolved. Problem solved.

27.12.2017 / 01:01