К сожалению, приложение остановлено

Question

Я пытаюсь сделать регистрационное приложение, но когда я открываю активность регистра, он падает. Я не могу понять, в чем проблема, я выполнил те же шаги в серии уроков https://www.youtube.com/watch?v=M4VTi5-Aw20 следующий мой код: Register.java: package com.mohd.loginre;

import android.content.Intent; 
     import android.os.Bundle; 
     import android.support.v7.app.ActionBarActivity; 
     import android.view.View; 
     import android.widget.Button; 
     import android.widget.EditText; 


     public class Register extends ActionBarActivity implements View.OnClickListener { 

     EditText user=(EditText)findViewById(R.id.rusername); 
     EditText pass=(EditText)findViewById(R.id.rpassword); 
     EditText ag=(EditText)findViewById(R.id.rage); 
     Button rsubmit; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_register); 
      rsubmit=(Button)findViewById(R.id.rsubmit); 
      rsubmit.setOnClickListener(this); 
     } 


     @Override 
     public void onClick(View v) { 
      if(v.getId()==R.id.rsubmit){ 
       String username=user.getText().toString(); 
       String password=pass.getText().toString(); 
       int age=Integer.parseInt(ag.getText().toString()); 
       User user=new User(username,password,age); 
       registerhim(user); 
      } 
     } 

     private void registerhim(User user) { 
      ServerRequests serverRequest=new ServerRequests(this); 
      serverRequest.storeUserDataInBackground(user, new GetUserCallback() { 
       @Override 
       public void done(User returnedUser) { 
        Intent loginIntent = new Intent(Register.this, Login.class); 
        startActivity(loginIntent); 
       } 
      }); 


     } 
    } 




    ServerRequests.java 

    package com.mohd.loginre; 

    import android.app.ProgressDialog; 
    import android.content.Context; 
    import android.os.AsyncTask; 
    import android.util.Log; 

    import org.apache.http.HttpEntity; 
    import org.apache.http.HttpResponse; 
    import org.apache.http.NameValuePair; 
    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 org.apache.http.params.BasicHttpParams; 
    import org.apache.http.params.HttpConnectionParams; 
    import org.apache.http.params.HttpParams; 
    import org.apache.http.util.EntityUtils; 
    import org.json.JSONObject; 

    import java.util.ArrayList; 

    public class ServerRequests { 
     ProgressDialog progressDialog; 
     public static final int Timeout = 1000 * 15; 
     public static final String server = "http://mohdgadi.netai.net/"; 
    public ServerRequests(Context context) { 
     progressDialog = new ProgressDialog(context); 
     progressDialog.setCancelable(false); 
     progressDialog.setTitle("Processing..."); 
     progressDialog.setMessage("Please wait..."); 
    } 

    public void storeUserDataInBackground(User user, 
              GetUserCallback userCallBack) { 
     progressDialog.show(); 
     new StoreUserDataAsyncTask(user, userCallBack).execute(); 
    } 

    public void fetchUserDataAsyncTask(User user, GetUserCallback userCallBack) { 
     progressDialog.show(); 
     new fetchUserDataAsyncTask(user, userCallBack).execute(); 
    } 

    /** 
    * parameter sent to task upon execution progress published during 
    * background computation result of the background computation 
    */ 

    public class StoreUserDataAsyncTask extends AsyncTask<Void, Void, Void> { 
     User user; 
     GetUserCallback userCallBack; 

     public StoreUserDataAsyncTask(User user, GetUserCallback userCallBack) { 
      this.user = user; 
      this.userCallBack = userCallBack; 
     } 

     @Override 
     protected Void doInBackground(Void... params) { 
      ArrayList<NameValuePair> dataToSend = new ArrayList<>(); 
      dataToSend.add(new BasicNameValuePair("username", user.username)); 
      dataToSend.add(new BasicNameValuePair("password", user.password)); 
      dataToSend.add(new BasicNameValuePair("age", user.age + "")); 

      HttpParams httpRequestParams = getHttpRequestParams(); 

      HttpClient client = new DefaultHttpClient(httpRequestParams); 
      HttpPost post = new HttpPost(server 
        + "Register.php"); 

      try { 
       post.setEntity(new UrlEncodedFormEntity(dataToSend)); 
       client.execute(post); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     private HttpParams getHttpRequestParams() { 
      HttpParams httpRequestParams = new BasicHttpParams(); 
      HttpConnectionParams.setConnectionTimeout(httpRequestParams, 
        Timeout); 
      HttpConnectionParams.setSoTimeout(httpRequestParams, 
        Timeout); 
      return httpRequestParams; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 
      progressDialog.dismiss(); 
      userCallBack.done(null); 
     } 

    } 

    public class fetchUserDataAsyncTask extends AsyncTask<Void, Void, User> { 
     User user; 
     GetUserCallback userCallBack; 

     public fetchUserDataAsyncTask(User user, GetUserCallback userCallBack) { 
      this.user = user; 
      this.userCallBack = userCallBack; 
     } 

     @Override 
     protected User doInBackground(Void... params) { 
      ArrayList<NameValuePair> dataToSend = new ArrayList<>(); 
      dataToSend.add(new BasicNameValuePair("username", user.username)); 
      dataToSend.add(new BasicNameValuePair("password", user.password)); 

      HttpParams httpRequestParams = new BasicHttpParams(); 
      HttpConnectionParams.setConnectionTimeout(httpRequestParams, 
        Timeout); 
      HttpConnectionParams.setSoTimeout(httpRequestParams, 
        Timeout); 

      HttpClient client = new DefaultHttpClient(httpRequestParams); 
      HttpPost post = new HttpPost(server 
        + "FetchUserData.php"); 

      User returnedUser = null; 

      try { 
       post.setEntity(new UrlEncodedFormEntity(dataToSend)); 
       HttpResponse httpResponse = client.execute(post); 

       HttpEntity entity = httpResponse.getEntity(); 
       String result = EntityUtils.toString(entity); 
       JSONObject jObject = new JSONObject(result); 

       if (jObject.length() != 0){ 
        Log.v("happened", "2"); 
        String name = jObject.getString("name"); 
        int age = jObject.getInt("age"); 

        returnedUser = new User(user.username, 
          user.password,age); 
       } 

      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      return returnedUser; 
     } 

     @Override 
     protected void onPostExecute(User returnedUser) { 
      super.onPostExecute(returnedUser); 
      progressDialog.dismiss(); 
      userCallBack.done(returnedUser); 
     } 
    } 
} 

я не получаю никаких ошибок во время компиляции я попробовал это на эмуляторе, так как мой андроид устройства, но тот же error.Please помощь !!

Answer 1

Move

EditText user=(EditText)findViewById(R.id.rusername); 
EditText pass=(EditText)findViewById(R.id.rpassword); 
EditText ag=(EditText)findViewById(R.id.rage); 

внутри onCreate(..) после setContentView(R.layout.activity_register);

Answer 2

Делай так:

Button rsubmit; 
EditText user,pass,ag; 

    @Override 
      protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.activity_register); 
       rsubmit=(Button)findViewById(R.id.rsubmit); 

       user=(EditText)findViewById(R.id.rusername); 
       pass=(EditText)findViewById(R.id.rpassword); 
       ag=(EditText)findViewById(R.id.rage); 


       rsubmit.setOnClickListener(this); 
      }