Could not find addContact (View) method in parent or ancestor context

Question

I have a problem while launching an Android application that throws this error:

Could not find the AddContact (View) method in the context of the parent or ancestor.

I do not see a problem since I did not write "@Override", and I correctly named the method name.

Three Java classes are involved here: UserDbHelper , UserContact and NewContactActivity .

UserDbHelper.java

 public class UserDbHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME = "USERINFO.DB"; private static final int DATABASE_VERSION = 1; private static final String CREATE_QUERY = "CREATE TABLE "+ UserContact.NewUserInfo.TABLE_NAME+"("+UserContact.NewUserInfo.USER_NAME+" TEXT,"+ UserContact.NewUserInfo.USER_MOB+" TEXT," + UserContact.NewUserInfo.USER_EMAIL+" TEXT);"; public UserDbHelper(Context context) //constructor { //superclass method constructor //pass three arguement - context object, database name, db version super(context,DATABASE_NAME,null,DATABASE_VERSION); Log.e("DATABASE OPERATIONS","Database created/opened...");//log message } @Override public void onCreate (SQLiteDatabase db) { //create table in this function //database created for the 1st time //if already exist, won't be calling this function db.execSQL(CREATE_QUERY); Log.e("DATABASE OPERATIONS","Table created...");//log message } public void addInformation(String name, String mob, String email,SQLiteDatabase db) { ContentValues contentValues = new ContentValues(); contentValues.put(UserContact.NewUserInfo.USER_NAME, name); contentValues.put(UserContact.NewUserInfo.USER_MOB, mob); contentValues.put(UserContact.NewUserInfo.USER_EMAIL, email); db.insert(UserContact.NewUserInfo.TABLE_NAME, null, contentValues); Log.e("DATABASE OPERATIONS","One row inserted..."); } 

NewContactActivity.java

 import android.app.Activity; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.Toast; public class NewContactActivity extends Activity { EditText ContactName, ContactMobile, ContactEmail; Context context = this; UserDbHelper userDbHelper; SQLiteDatabase sqLiteDatabase; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ContactName = (EditText)findViewById(R.id.user_contact_name); ContactMobile = (EditText)findViewById(R.id.user_contact_no); ContactEmail = (EditText)findViewById(R.id.user_email_add); } public void addContact(View v) { String name = ContactName.getText().toString(); String mob = ContactMobile.getText().toString(); String email = ContactEmail.getText().toString(); userDbHelper = new UserDbHelper(context); sqLiteDatabase = userDbHelper.getWritableDatabase();//get writing object userDbHelper.addInformation(name, mob, email, sqLiteDatabase); Toast.makeText(getBaseContext(), "Data Saved", Toast.LENGTH_LONG).show(); userDbHelper.close(); } } 

activity_main.xml

 <LinearLayout 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:orientation="vertical" tools:context="com.example.sqlitedatabaseex.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/contact_name" android:textSize="25sp" android:layout_marginTop="20dp" android:layout_marginLeft="10dp" /> <EditText android:id="@+id/user_contact_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="@string/contact_name_edit" android:textSize="20sp" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/contact_no" android:textSize="25sp" android:layout_marginTop="20dp" android:layout_marginLeft="10dp" /> <EditText android:id="@+id/user_contact_no" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="@string/contact_no_edit" android:textSize="20sp" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/email_add" android:textSize="25sp" android:layout_marginTop="20dp" android:layout_marginLeft="10dp" /> <EditText android:id="@+id/user_email_add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="@string/email_add_edit" android:textSize="20sp" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button" android:layout_gravity="center_horizontal" android:layout_marginTop="20dp" android:onClick="addContact" /> </LinearLayout> 

UserContact.java

 public class UserContact { public static abstract class NewUserInfo { public static final String USER_NAME = "user_name"; //column name public static final String USER_MOB = "user_mob"; public static final String USER_EMAIL = "user_email"; public static final String TABLE_NAME = "user_info";//table name } } 

The following is the error shown in Eclipse:

Answer 1

In your layout

  <Button android:id="@+id/save_user" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button" android:layout_gravity="center_horizontal" android:layout_marginTop="20dp" /> 

In your Activity ,

 public class NewContactActivity extends Activity { EditText ContactName, ContactMobile, ContactEmail; Context context = this; UserDbHelper userDbHelper; SQLiteDatabase sqLiteDatabase; Button btnSave; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ContactName = (EditText) findViewById(R.id.user_contact_name); ContactMobile = (EditText) findViewById(R.id.user_contact_no); ContactEmail = (EditText) findViewById(R.id.user_email_add); btnSave = (Button) findViewById(R.id.save_user); btnSave.setOnClickListener(new OnClickListener() { addContact(); ); } public void addContact() { -- No changes -- } }