同一活动中有两个oncreate捆绑保存实例状态？

问题描述

我对android开发非常陌生，遇到了一个问题，我似乎无法解决问题或无法解决问题。

我试图将导航抽屉添加到Java程序中具有底部导航栏的活动中。我的XML看起来不错并且可以正常工作，但是下面的Java报告了以下错误：

datetime

我理解并可以看到的

但我不知道如何解决-可能吗？

Series

解决方法

删除一个OnCreate(....)

尝试以下代码：

public class Dash extends AppCompatActivity {
    private DrawerLayout drawer;

    Button signout;
    ChipNavigationBar chipNavigationBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dash);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        signout=findViewById(R.id.logout);
        drawer = findViewById(R.id.drawer_layout);

        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this,drawer,toolbar,R.string.navigation_drawer_open,R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        signout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FirebaseAuth.getInstance().signOut();
                startActivity(new Intent(getApplicationContext(),Existing.class));
                finish();
            }
        });

        chipNavigationBar = findViewById(R.id.bottom_nav_menu);
        chipNavigationBar.setItemSelected(R.id.bottom_nav_menu,true);
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new NewsFragment()).commit();
        bottomMenu();
    }

    private void bottomMenu() {

        chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
            @Override
            public void onItemSelected(int i) {
                Fragment fragment = null;
                switch (i) {
                    case R.id.bottom_nav_menu:
                        fragment = new HomeFragment();
                        break;

                    case R.id.bottom_nav_news:
                        fragment = new NewsFragment();
                        break;

                    case R.id.bottom_nav_profile:
                        fragment = new ProfileFragment();
                        break;
                }
                getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,fragment).commit();
            }
        });

    }
 
    @Override public void onBackPressed(){
            if (drawer.isDrawerOpen(GravityCompat.START)) {
                drawer.closeDrawer(GravityCompat.START);
            } else {
                super.onBackPressed();
            }
        }
    }