java - Android Studio 启动画面在 Activity 开始前消失

Question

我遇到了闪屏问题。它仅显示半秒，并在 HomeZastepowy Activity 出现前几秒钟消失。我根据这个网站制作了这个启动画面https://android.jlelse.eu/right-way-to-create-splash-screen-on-android-e7f1709ba154 。我哪里出错了？

主要 Activity 代码:

import android.content.Intent;

import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;

import java.util.Objects;


public class MainActivity extends AppCompatActivity {
     FirebaseAuth mAuth;



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

        if (mAuth.getCurrentUser() != null) {
            String uid = mAuth.getUid();
            final DocumentReference mDocRef = FirebaseFirestore.getInstance().collection("Data").document("userInfo").collection(Objects.requireNonNull(uid)).document(uid);
            mDocRef.get()
                    .addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
                        @Override
                        public void onSuccess(DocumentSnapshot documentSnapshot) {
                            if (documentSnapshot.exists()) {
                                String user = documentSnapshot.getString("user");
                                assert user != null;
                                if (user.equals("user")) {

                                    Log.d("tag", String.valueOf(mAuth.getUid()));

                                    Intent intent = new Intent(getApplicationContext(),
                                            HomeUsrActivity.class);
                                    startActivity(intent);
                                    finish();
                                } else {
                                    Log.d("tag", "Zastepowy");

                                    Log.d("tag", String.valueOf(mAuth.getUid()));

                                    startActivity(new Intent(MainActivity.this, HomeZastepowy.class));

                                    finish();

                                }
                            }
                        }


                    }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
                }
            });
            finish();


        }else {
            Intent intent = new Intent(getApplicationContext(),
                    HomeActivity.class);
            startActivity(intent);
            finish();
        }


        }


    }

AndroidManifest代码:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.zapp4">

    <application
        android:allowBackup="true"
        android:fullBackupContent="@xml/backup_descriptor"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".HomeUsrActivity"></activity>
        <activity android:name=".LoginActivity" />
        <activity android:name=".punktyog" />
        <activity android:name=".punktywz" />
        <activity android:name=".HomeZastepowy" />
        <activity android:name=".tradycje" />
        <activity android:name=".wiedza" />
        <activity android:name=".kontakt" />
        <activity android:name=".zastepy" />
        <activity android:name=".historia" />
        <activity android:name=".onas" />
        <activity android:name=".HomeActivity" />
        <activity android:name=".MainActivity" android:theme="@style/SplashScreenTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 1

我认为问题是您忘记从代码中删除这一行:

setContentView(R.layout.activity_main)

因为您设置了ContentView，所以它会覆盖您的主题背景。所以尝试评论这一行并尝试一下。