I am with the help of a video tutorial that I saw on youtube, the app compiles well but when you enter the activity where the menu is and that floating button occurs this error
FATAL EXCEPTION: main
Process: company.viral.organizadorjec, PID: 16485
java.lang.RuntimeException: Unable to start activity ComponentInfo{company.viral.organizadorjec/company.viral.organizadorjec.MenuCentral}: java.lang.ClassCastException: android.support.v4.widget.DrawerLayout cannot be cast to android.widget.RelativeLayout
I add the classes involved in this dilemma
MENU CENTRAL.class (class where the menu and the button are)
package company.viral.organizadorjec;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.FragmentManager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import company.viral.organizadorjec.Fragment.AjustesF;
import company.viral.organizadorjec.Fragment.CalendarioF;
import company.viral.organizadorjec.Fragment.ConfiguracionActividadF;
import company.viral.organizadorjec.Fragment.ConfiguracionMateriaF;
import company.viral.organizadorjec.Fragment.ConfiguracionPeriodoF;
import company.viral.organizadorjec.Fragment.ConfiguracionProfesorF;
import company.viral.organizadorjec.Fragment.InicioF;
import company.viral.organizadorjec.Fragment.PerfilF;
import company.viral.organizadorjec.Fragment.ProfesoresF;
public class MenuCentral extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private PopupWindow popupadicion;
private DrawerLayout posicionpopup;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu_central);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
posicionpopup = (DrawerLayout) findViewById(R.id.drawer_layout);
//colocamos el fragment con que inicia el menu
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.contenedor,new InicioF()).commit();
//este es el apartado para el botonsito flotante
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
//metodo de escucha para el popup
@Override
public void onClick(View view) {
//implementamos el popup
LayoutInflater inflater = (LayoutInflater)getBaseContext().getSystemService(LAYOUT_INFLATER_SERVICE);
final View vistaadicion = inflater.inflate(R.layout.activity_pop_adicion,null);
popupadicion = new PopupWindow(
vistaadicion, RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT
);
//luego de clicear y abrir el popup le decimos...
//si das al profe ve a profe
LinearLayout btnprofe = (LinearLayout) vistaadicion.findViewById(R.id.btnagregarprofesor);
btnprofe.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.contenedor,new ConfiguracionProfesorF()).commit();
popupadicion.dismiss();
}
});
//si le das actividad ve actividad
LinearLayout btnactividad = (LinearLayout) vistaadicion.findViewById(R.id.btnagregaractividad);
btnactividad.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.contenedor,new ConfiguracionActividadF()).commit();
popupadicion.dismiss();
}
});
//si le das a materias ve a materias
LinearLayout btnmaterias = (LinearLayout) vistaadicion.findViewById(R.id.btnagregarmateria);
btnmaterias.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.contenedor,new ConfiguracionMateriaF()).commit();
popupadicion.dismiss();
}
});
//si le das a periodo ve a periodo
LinearLayout btnperiodo = (LinearLayout) vistaadicion.findViewById(R.id.btnagregarperiodo);
btnperiodo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.contenedor,new ConfiguracionPeriodoF()).commit();
popupadicion.dismiss();
}
});
//luego le decimos que cierre el popup con el boton
Button cerrarboton = (Button) vistaadicion.findViewById(R.id.btnpopupcerrar);
cerrarboton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
popupadicion.dismiss();
}
});
//hubicamos donde queremos el popup
popupadicion.showAtLocation(posicionpopup, Gravity.CENTER,0,0 );
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_central, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
FragmentManager fragmentManager = getSupportFragmentManager();
if (id == R.id.nav_camera) {
fragmentManager.beginTransaction().replace(R.id.contenedor,new InicioF()).commit();
} else if (id == R.id.nav_gallery) {
fragmentManager.beginTransaction().replace(R.id.contenedor,new ProfesoresF()).commit();
} else if (id == R.id.nav_slideshow) {
fragmentManager.beginTransaction().replace(R.id.contenedor,new CalendarioF()).commit();
} else if (id == R.id.nav_manage) {
fragmentManager.beginTransaction().replace(R.id.contenedor,new AjustesF()).commit();
} else if (id == R.id.nav_share) {
fragmentManager.beginTransaction().replace(R.id.contenedor,new PerfilF()).commit();
} else if (id == R.id.nav_send) {
} else if (id == R.id.nav_materia){
fragmentManager.beginTransaction().replace(R.id.contenedor,new ConfiguracionMateriaF()).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
activity_pop_adition.xml (this is the layout involved for the popup)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:background="#64ffffff"
android:layout_height="match_parent">
<TextView
android:text="¿Que desea adicionar?"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"
android:id="@+id/textView3" />
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:id="@+id/btnagregarprofesor">
<ImageView
android:layout_width="match_parent"
android:layout_height="52dp"
android:src="@drawable/ic_action_maps_local_library"
android:id="@+id/imageView2"
android:layout_weight="1" />
<TextView
android:text="Profesor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView4"
android:gravity="center"
android:textSize="24sp"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:id="@+id/btnagregaractividad">
<ImageView
android:layout_width="match_parent"
android:layout_height="52dp"
android:src="@drawable/ic_action_action_note_add"
android:id="@+id/imageView3"
android:layout_weight="1" />
<TextView
android:text="Actividad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView5"
android:gravity="center"
android:textSize="24sp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="@+id/btnagregarmateria">
<ImageView
android:layout_width="match_parent"
android:layout_height="52dp"
android:src="@drawable/ic_action_action_event"
android:id="@+id/imageView6" />
<TextView
android:text="Materia"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView7"
android:gravity="center"
android:textSize="24sp"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="@+id/btnagregarperiodo">
<ImageView
android:layout_width="match_parent"
android:layout_height="52dp"
android:src="@drawable/ic_action_action_event"
android:id="@+id/imageView8" />
<TextView
android:text="Periodo de Actividad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView9"
android:gravity="center"
android:textSize="24sp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
<Space
android:layout_width="match_parent"
android:layout_height="20dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"></LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<Button
android:text="Cancelar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnpopupcerrar" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"></LinearLayout>
</LinearLayout>
</LinearLayout>
activity_menu_central
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_menu_central"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_menu_central"
app:menu="@menu/activity_menu_central_drawer" />
</android.support.v4.widget.DrawerLayout>