无法解决类型错误

Question

I am getting a "Registration cannot be resolved to a type error in my code and I can't figure out why. I have a strong feeling this is an Eclipse bug unless someone can see something else. I just randomly got this error while editing another page so I have no idea why I am getting this.

I tried Cleaning the project and even rebuilding the project, still getting this error.

Here is a screenshot of the error in Eclipse:

And what is even stranger is that I try to see available classes while typing the code and Registration.java is not showing up in the list of available:

Any ideas on how to get it to show up in that list?

Here is my code:

package com.smeet;

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

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 com.sencide.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;



public class AndroidLogin extends Activity implements OnClickListener {


    Button ok,back,exit;
    TextView result;




    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
       setContentView(R.layout.main);



        // Login button clicked
        ok = (Button)findViewById(R.id.btn_login);
        ok.setOnClickListener(this);


        result = (TextView)findViewById(R.id.tbl_result);



    }









    public void postLoginData() {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();


        // login.php returns true if username and password match in db 
        HttpPost httppost = new HttpPost("http://www.somewebsite.com/android/login.php");

        try {




            // Add user name and password
            EditText uname = (EditText)findViewById(R.id.txt_username);
            String username = uname.getText().toString();



            EditText pword = (EditText)findViewById(R.id.txt_password);
            String password = pword.getText().toString();

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("username", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            Log.w("SENCIDE", "Execute HTTP Post Request");
            HttpResponse response = httpclient.execute(httppost);

            String str = inputStreamToString(response.getEntity().getContent()).toString();
            Log.w("SENCIDE", str);

            if(str.toString().equalsIgnoreCase("true"))
            {
                Log.w("SENCIDE", "TRUE");
                result.setText("Login Successful! Please Wait...");   
            }else
            {
                Log.w("SENCIDE", "FALSE");
                result.setText(str);                
            }

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    } 

    private StringBuilder inputStreamToString(InputStream is) {
        String line = "";
        StringBuilder total = new StringBuilder();
        // Wrap a BufferedReader around the InputStream
        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        // Read response until the end
        try {
            while ((line = rd.readLine()) != null) { 
                total.append(line); 
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        // Return full string
        return total;
    }


    //clicking register button will start up Register xml
    public void RegisterButton(View view) {

          Intent intent = new Intent(this, Registration.class);
          startActivity(intent);

    }




    @Override
    public void onClick(View view) {
                postLoginData();




                // turns the text in the textview "Tbl_result" into a text string called "tblresult"
                TextView tblresult = (TextView) findViewById(R.id.tbl_result);




        // If "tblresult" text string matches the string "Login Successful! Please Wait..." exactly, it will switch to next activity
                if (tblresult.getText().toString().equals("Login Successful! Please Wait...")) {
                      Intent intent = new Intent(this, Homepage.class);
                      EditText uname2 = (EditText)findViewById(R.id.txt_username);
                      String username2 = uname2.getText().toString();
                      intent.putExtra("username2", username2);
                      startActivity(intent);
                   }    






    }

}

My Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sencide"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name="com.sencide.AndroidLogin"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.sencide.NextActivity"
            android:label="@string/title_activity_next" >
        </activity>
           <activity
            android:name="com.sencide.Registration"
            android:label="@string/title_activity_registration" >
        </activity>
        <activity
            android:name="com.sencide.Homepage"
            android:label="@string/title_activity_next_screen" >
        </activity>


    </application>

</manifest>

Here is my Registration.java

package com.smeet;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.sencide.R;

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;


class RequestTask extends AsyncTask<String, String, String>{
      String responseString = null;


    @Override
    protected String doInBackground(String... uri) {
        HttpClient httpclient = new DefaultHttpClient();
        HttpResponse response;

        try {
            response = httpclient.execute(new HttpGet(uri[0]));
            StatusLine statusLine = response.getStatusLine();
            if(statusLine.getStatusCode() == HttpStatus.SC_OK){
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                response.getEntity().writeTo(out);
                out.close();
                String responseString = null;
                responseString = out.toString();
                Log.d("check response", responseString);


            } else{
                //Closes the connection.
                response.getEntity().getContent().close();
                throw new IOException(statusLine.getReasonPhrase());
            }
        } catch (ClientProtocolException e) {
            //TODO Handle problems..
        } catch (IOException e) {
            //TODO Handle problems..
        }
        return responseString;
    }


    protected void onPostExecute(String result) {
        super.onPostExecute(result);


    }







String result = null;

public class Registration extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);
          TextView detail = (TextView)findViewById(R.id.resulttext);
            detail.setText(result);
    }


    public void SubmitRegistration(View view) {




           // assign text in fields to string values
           EditText first = (EditText)findViewById(R.id.first);
           String first2 = first.getText().toString();

           EditText last = (EditText)findViewById(R.id.last);
           String last2 = last.getText().toString();

           EditText display = (EditText)findViewById(R.id.display);
           String display2 = display.getText().toString();
           //calculates the number of characters in the display field
           int length2 = display2.length();


           EditText email = (EditText)findViewById(R.id.email);
           String email2 = email.getText().toString();


           EditText password = (EditText)findViewById(R.id.password);
           String password2 = password.getText().toString();


           EditText vpassword = (EditText)findViewById(R.id.vpassword);
           String vpassword2 = vpassword.getText().toString();
           //calculates the number of characters in the password field
           int length = vpassword2.length();






    // verifying the following in order:  Passwords match? A Password field is empty?  
                                        //Password and Display Name less than 6 characters long? Email contains an @ sign and a period?   
           if(!vpassword2.equals(password2))
           {
               Toast.makeText(getApplicationContext(), "Passwords do not match!", Toast.LENGTH_SHORT).show(); 


           }
           else if (password2.isEmpty() || vpassword2.isEmpty()){

               Toast.makeText(getApplicationContext(), "Password field is empty", Toast.LENGTH_SHORT).show(); 
           }
           else if (length < 6 || length2 < 6 ) {

               Toast.makeText(getApplicationContext(), "Password and Display Name must be at least 6 characters long", Toast.LENGTH_LONG).show(); 

           }

           else if (!email2.contains("@") || !email2.contains(".")){

               Toast.makeText(getApplicationContext(), "Must enter valid email address.", Toast.LENGTH_SHORT).show(); 

           }

           else {


               //send php with all the data to server for validation and insertion into table
               new RequestTask().execute("http://www.somewebsite.com/android/registercheck.php?first=" + first2 + "&last=" + last2 + "&dispname=" + display2 + "&email=" + email2 + "&password=" + password2 );                       



           }
   }







}

}

Answer 1

Based on the comments and images in your post, I suspect you have in Registration.java

public class Register ...

when you should have

public class Registration ...

Also, now that you have added the code, Registration class should be on its own and not nested in RequestTask.

Answer 2

The Registration class is located in your GCM backend module . If you use Android Studio the integration is seamless, but in Eclipse you ahve to do some tricks by hand to get it working.