java.lang.RuntimeException: Невозможно начать работу, переходя к другому действию

Question

Я пытался сделать все, кроме ничего, что не работал, я хочу перейти от LogInActivity к RegisterUserActivity, нажав кнопку, но это не так Работа.

я получаю java.lang.RuntimeException, помогите пожалуйста, вот мой код:

LoginActivity:

public class LoginActivity extends Activity implements View.OnClickListener{ 
    private static final String LOGIN_URL = "http://ucwm.co.nf/UsuarioLogin_app.php"; 


    // Email, password edittext 
    EditText txtUsername; 
    EditText txtPassword; 

    Button btnReg; 

    // login button 
    Button btnLogin; 

    // Alert Dialog Manager 
    AlertDialogManager alert = new AlertDialogManager(); 

    // Session Manager Class 
    SessionManager session; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.login_layout); 

     // Session Manager 
     session = new SessionManager(getApplicationContext()); 

     // Email, Password input text 
     txtUsername = (EditText) findViewById(R.id.userName); 
     txtPassword = (EditText) findViewById(R.id.passwordUser); 

     Toast.makeText(getApplicationContext(), "User Login Status: " + session.isLoggedIn(), Toast.LENGTH_LONG).show(); 

     if(session.isLoggedIn()){ 
      Intent i = new Intent(getApplicationContext(), MainActivity.class); 
      startActivity(i); 
      finish(); 
     } 

     // Login button 
     btnLogin = (Button) findViewById(R.id.loginButton); 

     btnLogin.setOnClickListener(this); 

     btnReg=(Button)findViewById(R.id.btnReg); 

     btnReg.setOnClickListener(this); 

    } 

    private void login(){ 
     String username = txtUsername.getText().toString().trim(); 
     String password = txtPassword.getText().toString().trim(); 
     userLogin(username, password); 
    } 

    private void userLogin(final String username, final String password){ 
     class UserLoginClass extends AsyncTask<String,Void,String> { 

      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 
      } 

      @Override 
      protected void onPostExecute(String s) { 
       super.onPostExecute(s); 
       if (username.trim().length() > 0 && password.trim().length() > 0){ 
        if (s.equalsIgnoreCase("exito")) { 

         // Creating user login session 
         // For testing i am stroing name, email as follow 
         // Use user real data 
         session.createLoginSession(username); 

         // set 
         ((Usuario) getApplication()).setSomeVariable(username); 

         // Staring MainActivity 
         Intent i = new Intent(getApplicationContext(), MainActivity.class); 
         startActivity(i); 
         finish(); 


        } else { 
         //Error en username o password 
         alert.showAlertDialog(LoginActivity.this, "Fallo inicio de sesión..", "Usuario o Contraseña incorrecto", false); 
        } 
      } 
       else{ 
        // user didn't entered username or password 
        // Show alert asking him to enter the details 
        alert.showAlertDialog(LoginActivity.this, "Fallo inicio de sesión..", "Porfavor ingrese usuario y contraseña", false); 
       } 
      } 

      @Override 
      protected String doInBackground(String... params) { 
       HashMap<String,String> data = new HashMap<>(); 
       data.put("username",params[0]); 
       data.put("contrasenia",params[1]); 

       RegisterUserClass ruc = new RegisterUserClass(); 

       String result = ruc.sendPostRequest(LOGIN_URL,data); 

       return result; 
      } 
     } 
     UserLoginClass ulc = new UserLoginClass(); 
     ulc.execute(username, password); 
    } 

    @Override 
    public void onClick(View v) { 
     if(v == btnLogin){ 
      SharedPreferences preferences = this.getSharedPreferences("PREFERENCE", 0); 
      SharedPreferences.Editor editor = preferences.edit(); 
      editor.putBoolean("PREFERENCE",true); 
      login(); 
     } 
     if(v==btnReg){ 
      Intent i = new Intent(getApplicationContext(), RegisterUserAcivity.class); 
      startActivity(i); 
      finish(); 
     } 
    } 
} 

RegisterUserActivity:

public class RegisterUserAcivity extends AppCompatActivity implements View.OnClickListener{ 

private RadioGroup radioPrefijo; 
private RadioButton radioPre; 
private EditText editTextName; 
private EditText editTextUsername; 
private EditText editTextPassword; 
private EditText editTextEmail; 
private EditText editTextDate; 
private EditText editTextLastName; 
private EditText editTextTelefone; 

Calendar myCalendar = Calendar.getInstance(); 

String prefijo; 

private Button buttonRegister; 

private static final String REGISTER_URL = "http://ucwm.co.nf/UsuarioRegister_app.php"; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.register_layout); 

    editTextName = (EditText) findViewById(R.id.editTextNombre); 
    editTextUsername = (EditText) findViewById(R.id.editTextUsername); 
    editTextPassword = (EditText) findViewById(R.id.editTextContrasenia); 
    editTextTelefone = (EditText) findViewById(R.id.editTextTelefono); 
    editTextEmail = (EditText) findViewById(R.id.editTextEmail); 
    editTextDate = (EditText) findViewById(R.id.editTextFechaNac); 
    editTextLastName = (EditText) findViewById(R.id.editTextApellido); 

    buttonRegister = (Button) findViewById(R.id.btnRegistro); 

    addListenerOnButton(); 

    buttonRegister.setOnClickListener(this); 

    editTextDate.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      new DatePickerDialog(RegisterUserAcivity.this, date, myCalendar 
        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH), 
        myCalendar.get(Calendar.DAY_OF_MONTH)).show(); 
     } 
    }); 

} 

@Override 
public void onClick(View v) { 
    if(v == buttonRegister){ 
     registerUser(); 
     finish(); 
    } 
} 

private void registerUser() { 
    String name = editTextName.getText().toString(); 
    String lastName = editTextLastName.getText().toString().trim(); 
    String username = editTextUsername.getText().toString().trim(); 
    String password = editTextPassword.getText().toString().trim(); 
    String telefono = editTextTelefone.getText().toString().trim(); 
    String email = editTextEmail.getText().toString().trim().toLowerCase(); 
    String date = editTextDate.getText().toString().trim().toLowerCase(); 
    String pref= prefijo; 

    register(username,password,name,lastName,date,email,telefono,pref); 
} 

private void register(String username,String password,String name,String lastName,String date,String email,String telefono,String pref) { 
    class RegisterUser extends AsyncTask<String, Void, String>{ 
     ProgressDialog loading; 
     RegisterUserClass ruc = new RegisterUserClass(); 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
     } 

     @Override 
     protected void onPostExecute(String s) { 
      super.onPostExecute(s); 
      loading.dismiss(); 
      Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     protected String doInBackground(String... params) { 

      HashMap<String, String> data = new HashMap<String,String>(); 
      data.put("username",params[0]); 
      data.put("password",params[1]); 
      data.put("name",params[2]); 
      data.put("lastname",params[3]); 
      data.put("date",params[4]); 
      data.put("email",params[5]); 
      data.put("telefono",params[6]); 
      data.put("prefijo",params[7]); 

      String result = ruc.sendPostRequest(REGISTER_URL,data); 

      return result; 
     } 
    } 

    RegisterUser ru = new RegisterUser(); 
    ru.execute(username,password,name,lastName,date,email,telefono,pref); 
} 

public void addListenerOnButton() { 

    radioPrefijo = (RadioGroup) findViewById(R.id.radioPref); 

    int p = radioPrefijo.getCheckedRadioButtonId(); 

    radioPre = (RadioButton) findViewById(p); 
    prefijo = radioPre.getText().toString(); 

} 

DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() { 

    @Override 
    public void onDateSet(DatePicker view, int year, int monthOfYear, 
          int dayOfMonth) { 
     // TODO Auto-generated method stub 
     myCalendar.set(Calendar.YEAR, year); 
     myCalendar.set(Calendar.MONTH, monthOfYear); 
     myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth); 
     updateLabel(); 
    } 

}; 


private void updateLabel() { 
    String myFormat = "yy-MM-dd"; //In which you need put here 
    SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US); 
    editTextDate.setText(sdf.format(myCalendar.getTime())); 
} 

} 

LoginActivity XML

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" android:layout_height="match_parent"> 

<EditText 
    android:layout_width="200dp" 
    android:layout_height="wrap_content" 
    android:id="@+id/userName" 
    android:hint="Usuario" 
    android:layout_above="@+id/textView14" 
    android:layout_alignLeft="@+id/textView14" 
    android:layout_alignStart="@+id/textView14" 
    android:layout_marginBottom="41dp" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:ems="10" 
    android:id="@+id/passwordUser" 
    android:layout_centerVertical="true" 
    android:layout_centerHorizontal="true" 
    android:hint="Contraseña" 
    android:editable="false" 
    android:enabled="true" 
    android:inputType="textPassword" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Iniciar Sesión" 
    android:id="@+id/loginButton" 
    android:layout_marginTop="40dp" 
    android:layout_below="@+id/passwordUser" 
    android:layout_centerHorizontal="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Ingrese Usuario" 
    android:id="@+id/textView12" 
    android:layout_above="@+id/userName" 
    android:layout_alignLeft="@+id/userName" 
    android:layout_alignStart="@+id/userName" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Ingrese Contresña" 
    android:id="@+id/textView14" 
    android:layout_above="@+id/passwordUser" 
    android:layout_alignLeft="@+id/passwordUser" 
    android:layout_alignStart="@+id/passwordUser" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Registrarse" 
    android:id="@+id/btnReg" 
    android:layout_below="@+id/loginButton" 
    android:layout_alignLeft="@+id/loginButton" 
    android:layout_alignStart="@+id/loginButton" /> 

RegisterActivity XML

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" android:layout_height="match_parent"> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginRight="20dp" 
    android:layout_marginLeft="20dp"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Nombre (s)" 
     android:id="@+id/textView15" 
     android:layout_marginTop="20dp" 
     android:layout_alignParentTop="true" 
     android:layout_alignLeft="@+id/textView18" 
     android:layout_alignStart="@+id/textView18" /> 

    <EditText 
     android:layout_width="200dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/editTextNombre" 
     android:layout_centerHorizontal="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Apellido (s)" 
     android:id="@+id/textView16" 
     android:layout_below="@+id/editTextNombre" 
     android:layout_centerHorizontal="true" /> 

    <EditText 
     android:layout_width="200dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/editTextApellido" 
     android:layout_below="@+id/textView16" 
     android:layout_centerHorizontal="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Nombre de Usuario" 
     android:id="@+id/textView17" 
     android:layout_below="@+id/editTextApellido" 
     android:layout_centerHorizontal="true" /> 

    <EditText 
     android:layout_width="200dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/editTextUsername" 
     android:layout_below="@+id/textView17" 
     android:layout_centerHorizontal="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Contraseña" 
     android:id="@+id/textView21" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="textPassword" 
     android:ems="10" 
     android:id="@+id/editTextContrasenia" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Teléfono" 
     android:id="@+id/textView18" 
     android:layout_below="@+id/editTextTelefono" 
     android:layout_alignRight="@+id/textView20" 
     android:layout_alignEnd="@+id/textView20" /> 

    <EditText 
     android:layout_width="200dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/editTextTelefono" 
     android:layout_below="@+id/textView20" 
     android:layout_centerHorizontal="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Fecha de Nacimiento" 
     android:id="@+id/textView19" 
     android:layout_below="@+id/editTextFechaNac" 
     android:layout_centerHorizontal="true" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="date" 
     android:ems="10" 
     android:id="@+id/editTextFechaNac" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Correo" 
     android:id="@+id/textView20" 
     android:layout_below="@+id/editTextUsername" 
     android:layout_centerHorizontal="true" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="textEmailAddress" 
     android:ems="10" 
     android:id="@+id/editTextEmail" /> 

    <RadioGroup 
     android:id="@+id/radioPref" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" > 

     <RadioButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Usuario" 
      android:id="@+id/radioButtonUser" 
      android:layout_alignTop="@+id/radioButtonMedic" 
      android:layout_toRightOf="@+id/editTextNombre" 
      android:layout_toEndOf="@+id/editTextNombre" 
      android:checked="false" /> 

     <RadioButton 
      android:layout_width="wrap_content" 
      android:layout_height="20dp" 
      android:text="Médico" 
      android:id="@+id/radioButtonMedic" 
      android:layout_alignParentBottom="true" 
      android:layout_toLeftOf="@+id/editTextNombre" 
      android:layout_toStartOf="@+id/editTextNombre" 
      android:checked="false" /> 

    </RadioGroup> 



    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Registrarse" 
     android:id="@+id/btnRegistro" 
     android:layout_below="@+id/radioButtonUser" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="35dp" /> 

</LinearLayout> 

манифеста

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.juanisaac.unidascontigoac"> 

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

<!--ICONO DE LA APP--> 
<application 
    android:name="Usuario" 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" 
    android:largeHeap="true"> 

     <activity 
      android:name=".LoginActivity" 
      android:label="@string/app_name"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <!-- DashBoard/MainActivity --> 
    <activity 
     android:name=".MainActivity" 
     android:screenOrientation="portrait"> 
    </activity> 
    <activity 
     android:name=".SettingsActivity" 
     android:label="@string/title_activity_settings"> 
    </activity> 
    <activity 
     android:name=".TestimoniosDetallados" 
     android:label="Testimonios Detallados"> 
    </activity> 
    <activity 
     android:name=".AniadirForo" 
     android:label="Añadir Foro"> 
    </activity> 
    <activity 
     android:name=".ForoDetallado" 
     android:label="Foro Detallado"> 
    </activity> 
    <activity 
    android:name=".EventoDetallado" 
    android:label="Evento Detallado"> 
</activity> 
    <activity 
     android:name=".RegisterUserAcivity" 
     android:label="Register Activity"> 
    </activity> 
    <!-- 
    <activity 
     android:name=".SettingsActivity" 
     android:label="@string/title_activity_settings" > 
    </activity> 
    --> 
</application> 

Вот LogCat, что она показывает:

11-27 00:36:01.540 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ Late-enabling CheckJNI 
11-27 00:36:02.540 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libEGL_genymotion.so 
11-27 00:36:02.576 24273-24273/com.example.juanisaac.unidascontigoac D/﹕ HostConnection::get() New Host Connection established 0xb80bc298, tid 24273 
11-27 00:36:02.604 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_genymotion.so 
11-27 00:36:02.608 24273-24273/com.example.juanisaac.unidascontigoac D/libEGL﹕ loaded /system/lib/egl/libGLESv2_genymotion.so 
11-27 00:36:03.036 24273-24273/com.example.juanisaac.unidascontigoac W/EGL_genymotion﹕ eglSurfaceAttrib not implemented 
11-27 00:36:03.060 24273-24273/com.example.juanisaac.unidascontigoac D/OpenGLRenderer﹕ Enabling debug mode 0 
11-27 00:37:54.167 24273-24273/com.example.juanisaac.unidascontigoac I/Choreographer﹕ Skipped 36 frames! The application may be doing too much work on its main thread. 
11-27 00:37:54.307 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;) 
11-27 00:37:54.323 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested 
11-27 00:37:54.323 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve interface method 15466: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z 
11-27 00:37:54.327 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002 
11-27 00:37:54.335 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode 
11-27 00:37:54.339 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve interface method 15470: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode; 
11-27 00:37:54.339 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002 
11-27 00:37:54.407 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawable 
11-27 00:37:54.407 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve virtual method 405: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable; 
11-27 00:37:54.411 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002 
11-27 00:37:54.415 24273-24273/com.example.juanisaac.unidascontigoac I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawableForDensity 
11-27 00:37:54.419 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ VFY: unable to resolve virtual method 407: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable; 
11-27 00:37:54.423 24273-24273/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002 
11-27 00:37:54.463 24273-24276/com.example.juanisaac.unidascontigoac D/dalvikvm﹕ GC_CONCURRENT freed 221K, 3% free 8787K/9036K, paused 6ms+6ms, total 25ms 
11-27 00:37:54.479 24273-24273/com.example.juanisaac.unidascontigoac D/AndroidRuntime﹕ Shutting down VM 
11-27 00:37:54.483 24273-24273/com.example.juanisaac.unidascontigoac W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa6195908) 
11-27 00:37:54.487 24273-24273/com.example.juanisaac.unidascontigoac E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.juanisaac.unidascontigoac/com.example.juanisaac.unidascontigoac.RegisterUserAcivity}: java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
      at android.app.ActivityThread.access$600(ActivityThread.java:141) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
      at android.os.Handler.dispatchMessage(Handler.java:99) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:5041) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.example.juanisaac.unidascontigoac.RegisterUserAcivity.addListenerOnButton(RegisterUserAcivity.java:143) 
      at com.example.juanisaac.unidascontigoac.RegisterUserAcivity.onCreate(RegisterUserAcivity.java:58) 
      at android.app.Activity.performCreate(Activity.java:5104) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
            at android.app.ActivityThread.access$600(ActivityThread.java:141) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
            at android.os.Handler.dispatchMessage(Handler.java:99) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:5041) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
            at dalvik.system.NativeStart.main(Native Method) 
11-27 00:37:57.967 24273-24273/com.example.juanisaac.unidascontigoac I/Process﹕ Sending signal. PID: 24273 SIG: 9 

Answer 1

Здесь:

prefijo = radioPre.getText().toString(); 

линии вызывает проблемы, потому что radioPre является null.

getCheckedRadioButtonId() метод возврата -1если не проверено RadioButton найдено в RadioGroup.

Таким образом, в текущем RadioGroup XML все RadioButton android:checked свойство не установлено в android:checked="false" поэтому не проверено RadioButton доступны в RadioGroup и getCheckedRadioButtonId() вернется -1.

Чтобы устранить текущие проблемы, добавить, если условие перед обращением RadioButton:

if(p !=-1){ 
    radioPre = (RadioButton) findViewById(p); 
    prefijo = radioPre.getText().toString(); 
} 

Answer 2

У вас есть проблема:

public void addListenerOnButton() { 

radioPrefijo = (RadioGroup) findViewById(R.id.radioPref); 

int p = radioPrefijo.getCheckedRadioButtonId(); 

radioPre = (RadioButton) findViewById(p); 

prefijo = radioPre.getText().toString(); 

} 

Answer 3

Вы должны выполнить проверку ошибок здесь

public void addListenerOnButton() { 

    radioPrefijo = (RadioGroup) findViewById(R.id.radioPref); 

    int p = radioPrefijo.getCheckedRadioButtonId(); 

    radioPre = (RadioButton) findViewById(p); 
    prefijo = radioPre.getText().toString(); 

} 

потому что radioPrefijo.getCheckedRadioButtonId() может возвращать -1, если проверен случай без кнопки.Так что в этом случае findViewById возвращает нуль, и вы получаете исключение

Таким образом, вы должны установить одну из ваших радиокнопок проверяемых по умолчанию или добавить это, если ваш код

int p = radioPrefijo.getCheckedRadioButtonId(); 

if (p > 0){ 
    radioPre = (RadioButton) findViewById(p); 
    prefijo = radioPre.getText().toString(); 
} 

Answer 4

Вы вызываете отделку() в то время как ваша регистрация задача активна в фоновом режиме на линию № 58

registerUser(); 
     finish(); 

& в асинхронной задаче Ёра вы используете ссылку класса переменной MyCalendar, который был очищен, потому что деятельность закончена на линию № 143

private void updateLabel() { 
    String myFormat = "yy-MM-dd"; //In which you need put here 
    SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US); 
    editTextDate.setText(sdf.format(myCalendar.getTime())); 
} 

Ваш экземпляр календаря вызывает исключение нулевого указателя.

public class RegisterUserAcivity extends AppCompatActivity implements View.OnClickListener{ 
... 
... 

Calendar myCalendar = Calendar.getInstance(); 

Предлагаю завершить работу в postExecute задачи Async.