我在主要活动开始时运行onStart方法时遇到问题。我的onstart方法不检查条件,因此,每当我打开我的应用程序时,我总是一直指向我项目的register_activity,这是不可接受的,因为我希望只有那些新用户才可以直接访问registerr_activity,而不是那些在数据库中已经存在。

                         package com.example.bookstore;

                           import androidx.appcompat.app.AppCompatActivity;

                           import android.content.Intent;
                           import android.os.Bundle;
                           import android.os.SystemClock;

                           import com.google.firebase.auth.FirebaseAuth;
                           import com.google.firebase.auth.FirebaseUser;

                           public class MainActivity extends AppCompatActivity {

                           private FirebaseAuth firebaseAuth;

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

                           firebaseAuth = FirebaseAuth.getInstance(); accessing firebashauth object
                           SystemClock.sleep(3000);
                           Intent register = new Intent(MainActivity.this, Register_Activity.class);
                           startActivity(register);

                           //here register intent will shift from
                           mainactivity to register_activity after 3000 ms

                           finish(); here finishing the register intent
                             }

                          @Override
                          protected void **onStart()** {
                          super.onStart();

                        **FirebaseUser currentUser = firebaseAuth.getCurrentUser();**

                           ***if (currentUser == null)* {
                          Intent registerintent = new Intent(MainActivity.this,
                          Register_Activity.class);
                           startActivity(registerintent);
                           finish();
                           }

                            else {
                           *Intent homeactivity = new Intent(MainActivity.this,Home_Activity.class);
                           startActivity(homeactivity);
                           finish();*
                            }**
           This if condition is not checking in onStart method and thus due to this i am always directing to register_activity.
                              }}

最佳答案

根据android生命周期,onCreate()在onStart()之前被调用。
在onCreate()中的代码中,您正在执行

Intent register = new Intent(MainActivity.this, Register_Activity.class);
startActivity(register);


因此,即使在检查onStart()内的逻辑之前,它也始终会进入Register活动。
若要解决此问题,请从onCreate()中删除上述行。

07-24 09:47
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