package com.hanseo_software.keepermini;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import com.google.android.material.navigation.NavigationView;
public class DashboardActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
//Variables
DrawerLayout drawerLayout;
NavigationView navigationView;
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*---------------------Hooks------------------------*/
drawerLayout = findViewById(R.id.drawer_layout);
navigationView = findViewById(R.id.nav_view);
toolbar = findViewById(R.id.toolbar);
/*---------------------Tool Bar------------------------*/
setSupportActionBar(toolbar);
/*---------------------Navigation Drawer Menu------------------------*/
//Hide or show items
// Menu menu = navigationView.getMenu();
// menu.findItem(R.id.nav_logout).setVisible(false);
// menu.findItem(R.id.nav_profile).setVisible(false);
navigationView.bringToFront();
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.navigation_drawer_open,R.string.navigation_drawer_close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
navigationView.setNavigationItemSelectedListener(this);
navigationView.setCheckedItem(R.id.nav_home);
}
@Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.nav_home:
break;
case R.id.nav_login:
Intent intent = new Intent(DashboardActivity.this, LoginActivity.class);
startActivity(intent);
break;
case R.id.nav_share:
Toast.makeText(this, "Share", Toast.LENGTH_SHORT).show();
break;
}
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
}
logcat
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.navigation.NavigationView.bringToFront()' on a null object reference
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hanseo_software.keepermini/com.hanseo_software.keepermini.DashboardActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.navigation.NavigationView.bringToFront()' on a null object reference
