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PONullpointerException and getWritable()error on my sqlite databse
 

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  1. PONullpointerException and getWritable()error on my sqlite databse
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    <p>i want to save some data into sqlite databse but it occurred error NullpointerException,i unable to find this error please tell me</p> <p>DBHandler.java</p> <pre><code>public class DBHandler extends SQLiteOpenHelper{ /*public static final String TABLE_USER = "USERTABLE"; public static final String USER_NAME = "username"; public static final String PASSWORD = "password"; public static final String CONFIRM_PASSWORD = "confirm_password"; public static final String MOBILE_NO = "mobile_no"; */ // DataBase Name public final static String DATABASE = "UserDetails"; // DataBase Table Name's public final static String USER_TABLE = "TABLE_USER"; // Field names of MALLS Table public static final String USER_NAME = "username"; public static final String PASSWORD = "password"; public static final String CONFIRM_PASSWORD = "confirmpassword"; public static final String USER_MOBILE_NUMBER = "mobilenumber"; public static final String USER_EMAIL = "email"; private static final String LOGCAT=null; public DBHandler(Context context) { super(context, "androidsqlite.db",null, 1); // TODO Auto-generated constructor stub Log.d(LOGCAT,"Created"); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub String CREATE_TABLE_USER; CREATE_TABLE_USER = "CREATE TABLE IF NOT EXISTS " + USER_TABLE+ " (" + USER_NAME + " VARCHAR," + PASSWORD + " VARCHAR," + CONFIRM_PASSWORD + " VARCHAR," + USER_MOBILE_NUMBER + " VARCHAR," + USER_EMAIL+ " VARCHAR," + ")"; Log.d(LOGCAT,"CREATE_TABLE_USER Created"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub String query; query = "DROP TABLE IF EXISTS CREATE_TABLE_USER"; db.execSQL(query); onCreate(db); } public void insertUserDetails(HashMap&lt;String, String&gt; queryValues){ SQLiteDatabase database = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(USER_NAME, queryValues.get("username")); values.put(PASSWORD, queryValues.get("password")); values.put(CONFIRM_PASSWORD, queryValues.get("confirmPwd")); values.put(USER_MOBILE_NUMBER, queryValues.get("mobileNo")); database.insert("CREATE_TABLE_USER ", null, values); database.close(); } } </code></pre> <p>RegistrationActivity</p> <pre><code>public class RegistrationActivity extends Activity { private Context context; private EditText userNameEdt; private EditText passwordEdt; private EditText cnfrmPwdEdt; private EditText contactEdt; private Button submitBtn; private Button cancelBtn; private String userName; private String pswd; private String cnfrmPwd; private String contactNo; DBHandler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_registration); userNameEdt = (EditText)findViewById(R.id.userNameedt); passwordEdt = (EditText)findViewById(R.id.paswordEdit); cnfrmPwdEdt = (EditText)findViewById(R.id.confirmPaswordEdit); contactEdt = (EditText)findViewById(R.id.mobileNoedt); submitBtn = (Button)findViewById(R.id.submitbtn); cancelBtn = (Button)findViewById(R.id.cancel); handler = new DBHandler(context); submitBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub userName = userNameEdt.getText().toString(); pswd = passwordEdt.getText().toString(); cnfrmPwd = cnfrmPwdEdt.getText().toString(); contactNo= contactEdt.getText().toString(); HashMap&lt;String, String&gt; queryValues = new HashMap&lt;String,String&gt;(); queryValues.put("username", userName); queryValues.put("password", pswd); queryValues.put("confrmPwd", cnfrmPwd); queryValues.put("contact", contactNo); handler.insertUserDetails(queryValues); } }); } } </code></pre> <p>error</p> <pre><code>12-31 11:52:43.867: E/AndroidRuntime(820): at com.example.esecuresystrem.database.DBHandler.insertUserDetails(DBHandler.java:68) 12-31 11:53:54.908: E/AndroidRuntime(867): FATAL EXCEPTION: main 12-31 11:53:54.908: E/AndroidRuntime(867): java.lang.NullPointerException 12-31 11:53:54.908: E/AndroidRuntime(867): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157) 12-31 11:53:54.908: E/AndroidRuntime(867): at com.example.esecuresystrem.database.DBHandler.insertUserDetails(DBHandler.java:68) 12-31 11:53:54.908: E/AndroidRuntime(867): at com.example.esecuresystrem.RegistrationActivity$1.onClick(RegistrationActivity.java:68) 12-31 11:53:54.908: E/AndroidRuntime(867): at android.view.View.performClick(View.java:3480) </code></pre>
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