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[英]why does onStart() method run before onCreate in my android project?
[英]Why my onStart() function is not working at start of the main activity of my project?
我在主要活動開始時運行onStart方法時遇到問題。 我的onstart方法不檢查條件,因此每當我打開我的應用程序時,我總是一直指向我項目的register_activity,這是不可接受的,因為我希望只有新用戶才可以直接訪問registerr_activity,而不是在數據庫中已經存在。
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.
}}
根據android生命周期,onCreate()在onStart()之前被調用。 在onCreate()中的代碼中,您正在執行
Intent register = new Intent(MainActivity.this, Register_Activity.class);
startActivity(register);
因此,即使在檢查onStart()內的邏輯之前,它也始終會進入Register活動。 要解決此問題,請從onCreate()中刪除上述行。
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