Invocation Target Exception

See more:

Mobile

Android

The following is one of the files where in I user is authenticated and logged in.
I am getting an exception when i try to start another activity after authenticating user.

import java.util.Locale;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class LoginActivity extends Activity 
{   
    String strUsername, strPassword;
    SQLiteDatabase dbCallLog;
    Intent intent;
    
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        try
        {
            super.onCreate(savedInstanceState);
                        
            //Set Content View to Login Layout
            setContentView(R.layout.login);
                
            //Call to CreateDatabase Function
            CreateDatabase();
            
            /*Check if SD Card is mounted*/
            if(!(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)))
            {
                /*If SD Card is not mounted, display an Alert and exit App. */
                ShowAlertDialog("SD Card not mounted. Please Insert SD Card and try again.");
                finish();
            }
            
            //Button Click Listener for Login button
            Button cmdLogin = (Button)findViewById(R.id.btnLogin);
            cmdLogin.setOnClickListener(new View.OnClickListener() 
            {               
                public void onClick(View v1) 
                {   
                    EditText username = (EditText)findViewById(R.id.txtLUsername);
                    EditText password = (EditText)findViewById(R.id.txtLPassword);
                    
                    String Uname = username.getEditableText().toString();
                    String UPassword = password.getEditableText().toString();
                    if(username.length()<1 || password.length()<1)
                    {
                        ShowAlertDialog("All details must be entered");
                    }
                    else
                    {
                        try
                        {
                            dbCallLog = openOrCreateDatabase("calllog.db", SQLiteDatabase.CREATE_IF_NECESSARY, null);
                            dbCallLog.setVersion(3);
                            dbCallLog.setLocale(Locale.getDefault());
                            dbCallLog.setLockingEnabled(true);              
                            
                            Cursor c = dbCallLog.query("users", null, null, null, null, null, null);     
                            
                            while(c.moveToNext())
                            {               
                                String s1 = c.getString(3);
                                String s2 = c.getString(4);
                                if((s1.equals(Uname)) && (s2.equals(UPassword)))
                                {
                                    intent = new Intent(v1.getContext(), ApplicationScreen.class);
                                    startActivityForResult(intent, 0);//Exception is being thrown when i try to start this activity
                                }       
                                else
                                {
                                    ShowAlertDialog("Incorrect login details");
                                }
                            }   
                            
                            if(c.isNull(0) == false)
                            {
                                ShowAlertDialog("Username doesn't exist");
                            }       
                        }
                        finally
                        {
                            dbCallLog.close();
                        }                       
                    }           
                }
            });
            
            //Button Click Listener for Signup button
            Button cmdSignup = (Button)findViewById(R.id.btnSignup);
            cmdSignup.setOnClickListener(new View.OnClickListener() {
                
                public void onClick(View v2) 
                {
                    Intent intent = new Intent(v2.getContext(), NewUserRegistration.class);
                    startActivityForResult(intent, 0);                  
                }
            });
        }
        catch(Exception e)
        {   
            Log.e("Error", "Error", e);
        }    
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.login, menu);
        return true;
    }
    
    public void CreateDatabase()
    {       
        /*Check if Database exists , else create a Database. */
        dbCallLog = openOrCreateDatabase("calllog.db", SQLiteDatabase.CREATE_IF_NECESSARY, null);

        /*Set the Database Version*/
        dbCallLog.setVersion(3); 
        
        /*Set the Database Locale*/
        dbCallLog.setLocale(Locale.getDefault());
        
        /*Enable Database Locking*/
        dbCallLog.setLockingEnabled(true);
        
        try
        {           
            /*Create a Table in the Database. */
            final String strCommand = "create table users (_id integer primary key autoincrement,fullname text,email text,username text not null unique,password textl);";
            dbCallLog.execSQL(strCommand);    
        }
        catch(SQLException e)
        {
            Log.d("CreateDatabase()",e.toString());
        }
        finally
        {
            dbCallLog.close();
        }
    }

    
    
    public void ShowAlertDialog(String strErrorMessage)
    {
        AlertDialog adMessage = new AlertDialog.Builder(this).create();
        adMessage.setMessage(strErrorMessage);
        adMessage.setButton("Ok", new DialogInterface.OnClickListener() {
            
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        adMessage.show();
    }
    
}