NullPointer exception while using edittext

Question

I wanna store this van values in local host database but it is unfortunately stopped working please help

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.ActionBar;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class UserOptions extends OnscreenActivity {
    protected Button subButton;
     EditText vNumber;
     InputStream is=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActionBar actionbar = getActionBar();
        actionbar.hide();
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
        vNumber = (EditText)findViewById(R.id.editText1);

        setContentView(R.layout.activity_user_options);
        Spinner Schoolspin = (Spinner) findViewById(R.id.spinner1);
        // Create an ArrayAdapter using the string array and a default spinner
        // layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.school_names,
                android.R.layout.simple_spinner_item);

        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        Schoolspin.setAdapter(adapter);

        Spinner stateSpin = (Spinner) findViewById(R.id.spinner2);
        // Create an ArrayAdapter using the string array and a default spinner
        // layout
        ArrayAdapter<CharSequence> adapterstate = ArrayAdapter
                .createFromResource(this, R.array.state,
                        android.R.layout.simple_spinner_item);
        // Specify the layout to use when the list of choices appears
        adapterstate
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        stateSpin.setAdapter(adapterstate);

        Spinner citySpin = (Spinner) findViewById(R.id.spinner3);
        // Create an ArrayAdapter using the string array and a default spinner
        // layout
        ArrayAdapter<CharSequence> cityadapter = ArrayAdapter
                .createFromResource(this, R.array.City,
                        android.R.layout.simple_spinner_item);
        // Specify the layout to use when the list of choices appears
        cityadapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        citySpin.setAdapter(cityadapter);

        subButton = (Button) findViewById(R.id.button1);
        subButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub

                String van = ""+vNumber.getText().toString();
                List<NameValuePair> nameValue = new ArrayList<NameValuePair>(1);
                nameValue.add(new BasicNameValuePair("VAN", van));
                try {
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpPost httpPost = new HttpPost(
                            "http://10.0.2.2/tutorial.php");
                    httpPost.setEntity(new UrlEncodedFormEntity(nameValue));
                    HttpResponse httpResponse = httpClient.execute(httpPost);
                    HttpEntity entity = httpResponse.getEntity();
                    is=entity.getContent();
                    String msg = "Data Entered Succesfully";
                    Toast.makeText(getApplicationContext(), msg,
                            Toast.LENGTH_LONG).show();
                } catch (ClientProtocolException e) {
                    Log.e("ClientProtocol", "Log_Tag");
                    e.printStackTrace();
                } catch (IOException e) {
                    Log.e("Log_Tag", "IOException");
                    e.printStackTrace();
                }
                Intent intent = new Intent(UserOptions.this,
                        OnscreenActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);

            }

        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.user_options, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Useroptions.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.testmap12.UserOptions" >

    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/spinner1"
        android:layout_centerHorizontal="true" />

    <Spinner
        android:id="@+id/spinner3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/spinner2"
        android:layout_centerHorizontal="true" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/spinner3"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="24dp"
        android:text="@string/submitButton" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/spinner1"
        android:layout_marginTop="20dp"
        android:hint="@string/hintSchool" >

        <requestFocus />
    </EditText>

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/spinner2"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="22dp" />

</RelativeLayout>

Logcat

07-21 13:54:52.665: E/AndroidRuntime(2965): FATAL EXCEPTION: main
07-21 13:54:52.665: E/AndroidRuntime(2965): Process: com.example.testmap12, PID: 2965
07-21 13:54:52.665: E/AndroidRuntime(2965): java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
07-21 13:54:52.665: E/AndroidRuntime(2965):     at com.example.testmap12.UserOptions$1.onClick(UserOptions.java:90)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.view.View.performClick(View.java:4756)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.view.View$PerformClick.run(View.java:19749)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.os.Handler.handleCallback(Handler.java:739)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.os.Handler.dispatchMessage(Handler.java:95)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.os.Looper.loop(Looper.java:135)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at android.app.ActivityThread.main(ActivityThread.java:5221)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at java.lang.reflect.Method.invoke(Native Method)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at java.lang.reflect.Method.invoke(Method.java:372)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
07-21 13:54:52.665: E/AndroidRuntime(2965):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Mahesh Suthar · Answer 1 · 2015-07-21T08:52:02.657

0

Change your code like this

 @Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_user_options);
    ActionBar actionbar = getActionBar();
    actionbar.hide();
    vNumber = (EditText)findViewById(R.id.editText1);
    Spinner Schoolspin = (Spinner) findViewById(R.id.spinner1); 
    //Remaining code is as it is

}

edited Jul 21 '15 at 08:52

answered Jul 21 '15 at 08:44

Mahesh Suthar

237
1
11

can u please edit the above code and tell me where i was wrong – Heman Parbhakar Jul 21 '15 at 08:46
Unable to enter data in the database – Heman Parbhakar Jul 21 '15 at 08:53

score 0 · Answer 2 · answered Jul 21 '15 at 08:45

The setContentView() needs to be before findviewbyid calls. Thats how the compiler identifies where to find your edittext.

Change the order in this:

 vNumber = (EditText)findViewById(R.id.editText1);

 setContentView(R.layout.activity_user_options);

score 0 · Answer 3 · answered Jul 21 '15 at 08:45

0

You need put:

    setContentView(R.layout.activity_user_options);
    vNumber = (EditText)findViewById(R.id.editText1);

answered Jul 21 '15 at 08:45

yshahak

4,996
1
31
37

But this is new question, no? – yshahak Jul 21 '15 at 08:50
this is my php file – Heman Parbhakar Jul 21 '15 at 08:50
Sorry, it really don't have any relation to your original question. Ask new question with the relevant code – yshahak Jul 21 '15 at 08:52

score 0 · Answer 4 · edited May 23 '17 at 11:58

onCreate(Bundle) is where you initialize your activity. Most importantly, here you will usually call setContentView(view) with a layout resource defining your UI, and using findViewById(int) to retrieve the widgets in that UI that you need to interact with programmatically.

Why findViewById() is returning null if setcontentview() is not called?

But error in "id",is it possible to get ids if widget from a java class without set as contentview ?? '

You have to create dynamic view then you do not have need to call setcontentview.

setContentView(R.layout.activity_user_options);
vNumber = (EditText)findViewById(R.id.editText1);

NullPointer exception while using edittext

4 Answers4