Getting java.lang.NullPointerException running android app

Question

I don't know what is going on, I can't run my app. What it does is take some information data from the API and list it in a listview, I think something is wrong with my ClienteActivity, but I don't know what.

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android/com.android.MainActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5086)
            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:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
     **Caused by: java.lang.NullPointerException
            at com.android.MainActivity.onCreate(MainActivity.java:40)**
            at android.app.Activity.performCreate(Activity.java:5248)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5086)
            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:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

The MainActivity:

public class MainActivity extends SherlockFragmentActivity {

    private ViewPager mViewPager;
    private TabsAdapter mTabsAdapter;
    private ActionBar barra;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        mViewPager = new ViewPager(this);
        mViewPager.setId(R.id.pager);
        setContentView(mViewPager);


        mTabsAdapter = new TabsAdapter(this, mViewPager);
        **mTabsAdapter.addTab(barra.newTab().setIcon(R.drawable.clientes).setText(" Clientes"), ClienteActivity.class, null);**


        barra = getSupportActionBar();
        barra.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);




    }
    private static final int REFRESH = 1;
    private static final int SEARCH = 2;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.main, menu);

        menu.add(0, REFRESH, 0, "Refresh")
                .setIcon(R.drawable.ic_action_view_as_grid)
                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);


        menu.add(0, SEARCH, 0, "Search")
                .setIcon(R.drawable.ic_action_search)
                .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case REFRESH:

                return true;
            case SEARCH:
                // Do search
                return true;
            case R.id.add_item:
                this.dispatchSync();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }





    private void dispatchSync() {

        SincronizarTask mSincronizarTask = new SincronizarTask(this);
        mSincronizarTask.inicia();

    }


}

The ClienteActivity:

public class ClienteActivity extends SherlockFragment {


    public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_cliente, container, false);


        try {


            ClienteViewAdapter ad = new ClienteViewAdapter(this.getActivity(), R.layout.fragment_cliente_item);
            ListView lv = (ListView) view.findViewById(R.id.listaClientes);

            lv.setVerticalFadingEdgeEnabled(true);
            lv.setVerticalScrollBarEnabled(true);

            lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                   // TextView clienteId = (TextView) view.findViewById(R.id.clienteId);
                    TextView clienteNome = (TextView) view.findViewById(R.id.clienteNome);
                    TextView clienteTipoPessoa = (TextView) view.findViewById(R.id.clienteTipo);

                    Intent intent = new Intent(getActivity(), ContatosView.class);
                    //intent.putExtra("id_cliente", clienteId.getText()); // envia o id do cliente para a tela de detalhes
                    intent.putExtra("nome", clienteNome.getText());
                    intent.putExtra("tipo_pessoa", clienteTipoPessoa.getText());

                    startActivity(intent);

                }
            });

            lv.setAdapter(ad);

        } catch (Exception e) {
            new AlertDialog.Builder(getActivity()).setTitle("Erro").setMessage(e.getMessage()).setNeutralButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {

                }
            }).show();
        }




        return view;
    }



    private void gerarToast(CharSequence message) {
        int duration = Toast.LENGTH_LONG;
        Toast toast = Toast
                .makeText(getActivity(), message, duration);
        toast.show();
    }

}

The Adapter:

public class ClienteViewAdapter extends ArrayAdapter<ClientesModel> {

    private final LayoutInflater inflater;

    private final int resourceId;

    public ClienteViewAdapter(FragmentActivity context, int resource) {
        super(context, resource);
        this.inflater = LayoutInflater.from(context);
        this.resourceId = resource;
    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {

        ClientesModel cliente = getItem(position);

        view = inflater.inflate(resourceId, parent, false);

        //TextView tvId = (TextView) view.findViewById(R.id.txtTitle);
        TextView tvNome = (TextView) view.findViewById(R.id.clienteNome);
        TextView tvTipo = (TextView) view.findViewById(R.id.clienteTipo);

        //tvId.setText(String.valueOf(cliente.ge()));
        tvNome.setText(cliente.getNome());
        tvTipo.setText(cliente.getTipo_pessoa());

        return view;
    }

}

And the Parsed Json:

public class ClientRest {
    private RequestQueue mRequestQueue;
    private ArrayList<ClientesModel> arrNews ;
    public ArrayList<ClientesContatosModel> arrContatos ;
    private Activity context;


    public ClientRest(Activity ctx) {
        this.context = ctx;
    }

    public interface ClientesRestListener {
        public void clientesReceived(List<ClientesModel> clientes);
    }

    public final void getClientes(final ClientesRestListener listener) {

        String url = "http://192.168.1.1/api/api/client/index.php";

        // filtros

        final ProgressDialog pDialog = new ProgressDialog(this.context);
        pDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        pDialog.setTitle("Sincronizando");
        pDialog.setMessage("Aguarde...");
        pDialog.show();
        arrNews = new ArrayList<ClientesModel>();
        arrContatos = new ArrayList<ClientesContatosModel>();

        mRequestQueue = Volley.newRequestQueue(this.context);

        JsonObjectRequest mJsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {

            @Override
            public void onResponse(JSONObject response) {
                List<ClientesModel> clientes = null;
                try {
                    clientes = parseJSON(response);
                    pDialog.hide();
                } catch (JSONException e) {
                    e.printStackTrace();

                }
                listener.clientesReceived(clientes);
            }

        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                if (pDialog.isShowing()) {
                    pDialog.hide();
                }
                error.printStackTrace();
            }

        }
        ) 

        mRequestQueue.add(mJsonObjectRequest);
    }

    private List<ClientesModel> parseJSON(JSONObject json) throws JSONException {
        try {


            JSONArray dados = json.getJSONArray("dados");

            for (int i = 0; i < dados.length(); i++) {

                JSONObject item = dados.getJSONObject(i);


                ClientesModel mClientesModel = new ClientesModel();
                ClientesContatosModel mClientesContatoModel = new ClientesContatosModel();

                /* cadastra os dados necessários no objeto no modelo */
                mClientesModel.setId(item.optInt("id"));
                mClientesModel.setNome(item.optString("nome"));
                mClientesModel.setTipo_pessoa(item.optString("tipo_pessoa"));
                mClientesModel.setInformacoes_adicionais(item.optString("informacoes_adicionais"));
                mClientesModel.setCpf(item.optString("cpf"));
                mClientesModel.setCnpj(item.optString("cnpj"));
                JSONArray contatos = item.getJSONArray("contatos");
                for (int j = 0; j < contatos.length(); j++) {
                    JSONObject data = contatos.getJSONObject(j);

                    mClientesContatoModel.setNome(data.optString("nome"));

                    mClientesContatoModel.setCargo(data.optString("cargo"));

                }

                arrNews.add(mClientesModel);
                arrContatos.add(mClientesContatoModel);
            }


        } catch (Exception e) {
            e.printStackTrace();
        }
        return arrNews;
    }


}

what is your line no 40 in MainActivity.class ?

i.n.e.f
– i.n.e.f

2014-07-24 12:57:21 +00:00
Commented Jul 24, 2014 at 12:57 — i.n.e.f
– i.n.e.f, Commented Jul 24, 2014 at 12:57

Blackbelt · Accepted Answer · 2014-07-24 12:57:18Z

4

private ActionBar barra;

you have to initialze it before accessing it

 barra = getActionBar()

or

 barra = getSupportActionBar()

if you are using the system ActionBar in the former case or, ActionBarCompat/ActionBarSherlock in the latter

answered Jul 24, 2014 at 12:57

Blackbelt

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3 Comments

Ridcully Over a year ago

Actually it is initialized, but after line #40.

Blackbelt Over a year ago

@Ridcully it is initalized after he tries to access it, mTabsAdapter.addTab(barra.newTab().

Ridcully Over a year ago

Exactly. It's just that you wrote "never explicity initialized".

i.n.e.f · Accepted Answer · 2014-07-24 12:59:44Z

change this code

    mViewPager = new ViewPager(this);
    mViewPager.setId(R.id.pager);
    setContentView(mViewPager);


    mTabsAdapter = new TabsAdapter(this, mViewPager);
    **mTabsAdapter.addTab(barra.newTab().setIcon(R.drawable.clientes).setText("   Clientes"), ClienteActivity.class, null);**


    barra = getSupportActionBar();
    barra.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

to

    mViewPager = new ViewPager(this);
    mViewPager.setId(R.id.pager);
    setContentView(mViewPager);

    barra = getSupportActionBar();
    barra.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    mTabsAdapter = new TabsAdapter(this, mViewPager);
    **mTabsAdapter.addTab(barra.newTab().setIcon(R.drawable.clientes).setText(" Clientes"), ClienteActivity.class, null);**

Hope this helps...

Giru Bhai · Accepted Answer · 2014-07-24 13:05:00Z

1

As @blackbelt suggested,you have to initialze barra before accessing it,So change

    **mTabsAdapter.addTab(barra.newTab().setIcon(R.drawable.clientes).setText(" Clientes"), ClienteActivity.class, null);**
barra = getSupportActionBar();
barra.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

to

barra = getSupportActionBar();
barra.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
**mTabsAdapter.addTab(barra.newTab().setIcon(R.drawable.clientes).setText(" Clientes"), ClienteActivity.class, null);**

edited Jul 24, 2014 at 13:05

answered Jul 24, 2014 at 12:59

Giru Bhai

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