NullPointer Exception Error When Bringing Fragment Data

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NullPointer Exception Error When Bringing Fragment Data

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#1 by (1 votes)

1

I'm having a NullPointerException error while trying to return the data from a Fragment. The NPE error is fine in this line:

String comentarioFoto = fragment_obj.campoComentarioFoto.getText().toString();

See my activity code:

public class LayoutActivity extends SherlockFragmentActivity {

     Fragment1 fragment_obj;

    private static final int SELECT_PICTURE = 1;
    private String selectedImagePath;

    public static final int MEDIA_TYPE_IMAGE = 1;
    public static final int MEDIA_TYPE_VIDEO = 2;

    private WrapData wd;
    private String answer;

    File caminhoFoto;
    File caminhoVideo;
    VideoView videoview;
    Spinner campoDepartamento;

    Button btnenviaVideo;
    Button btnenviaFoto;

    private String[] departamentoNome = new String[]{"Assistência Social", "Administração", "Agricultura", "Educação", "Finanças", 
            "Indústria Comércio e Turismo", "Planejamento e Urbanismo", "Transportes", "Obras e Serviços Públicos e Urbanos"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ActionBar ab = getSupportActionBar();
        ab.setDisplayHomeAsUpEnabled(true);

        /* Variáveis dos botões do campo foto e Video */

        btnenviaFoto = (Button) findViewById(R.id.btn_salvarFoto);
        btnenviaVideo = (Button) findViewById(R.id.btn_salvarVideo);

        /* Recupera os dados do Fragment */

        Fragment1 fragment_obj = (Fragment1)getSupportFragmentManager().findFragmentById(R.id.containerFragment);
        String comentarioFoto = fragment_obj.campoComentarioFoto.getText().toString();
        System.out.println(comentarioFoto);


    }
}

Fragment code:

package br.com.example.souprogresso;

// FRAGMENTO RESPONSAVEL PELO LAYOUT DE FOTO

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.support.v4.app.Fragment;


public class Fragment1 extends Fragment {

    EditText campoComentarioFoto;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.layout_fragment_1, container, false);

        campoComentarioFoto = (EditText) rootView.findViewById(R.id.edt_comentarioFoto);
        //String comentarioFoto = campoComentarioFoto.getText().toString();

        return rootView;
    }

}

Fragment XML:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:id="@+id/containerFragment"
     >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >

            <ImageView
                android:id="@+id/img_camera"
                android:layout_width="match_parent"
                android:layout_height="120dp"
                android:background="#000"
                android:src="@drawable/bg"/>

            <Button
                android:id="@+id/btn_tirarFoto"
                android:layout_width="match_parent"
                android:layout_height="45dp"
                android:onClick="tirarFoto"
                android:text="Tirar Foto" />

            <Button
                android:id="@+id/btn_capturaFoto"
                android:layout_width="match_parent"
                android:layout_height="45dp"
                android:onClick="selecionarFoto"
                android:text="Capturar Foto do Celular" />

            <Button
                android:id="@+id/btn_abrirMapa"
                android:layout_width="match_parent"
                android:layout_height="45dp"
                android:text="Buscar Localização" />


            <TextView
                android:text="Digite um Comentário"
                android:textSize="15sp"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:paddingLeft="15dp"
                android:textColor="#000"
                />

            <EditText
                android:id="@+id/edt_comentarioFoto"
                android:layout_width="match_parent"
                android:layout_height="72dp"
                android:background="#FFF"
                android:ems="10"
                android:inputType="textMultiLine"
                android:hint="Digite um comentário"
                 />


            <Button
                android:id="@+id/btn_salvarFoto"
                android:layout_width="match_parent"
                android:layout_height="65dp"
                android:onClick="salvarBDFoto"
                android:text="Enviar Foto"
                />

        </LinearLayout>

</ScrollView>

java android nullpointerexception

asked by anonymous 23.06.2015 / 16:26

1 answer

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score 1 · Answer 1

We're assuming you've declared the fragment in the Activity xml, okay? Because if you have not done so, the fragment is not yet added to the activity.

The second point is that the fragment may not be added to Activity in the location where you are trying to get the value of the field.

So you can override this method to know the right time to do this operation:

 @Override
    public void onAttachFragment(Fragment fragment) {
        super.onAttachFragment(fragment);

        if(fragment instanceof Fragment1){
            ((Fragment1)fragment).campoComentarioFoto.getText().toString();
        }
    }

This code does not make much sense to me, but only for you to understand what might be happening in your case.