Java 启动屏幕-如何启动？

我对启动屏幕有问题，因为一旦启动应用程序，我会首先看到主活动，启动屏幕之后，会出现什么错误

public class MainActivity extends AppCompatActivity {

int time = 3000;

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

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent i = new Intent(MainActivity.this, Splash_screen.class);
            startActivity(i);
            finish();
        }
    }, time);

MainActivity的XML代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">


<ImageButton
    android:id="@+id/b10"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginTop="450dp"
    android:layout_marginEnd="30dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageButton
    android:id="@+id/b9"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginStart="30dp"
    android:layout_marginTop="450dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageButton
    android:id="@+id/b8"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginTop="250dp"
    android:layout_marginEnd="30dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageButton
    android:id="@+id/b7"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginStart="30dp"
    android:layout_marginTop="250dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageButton
    android:id="@+id/b"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginTop="50dp"
    android:layout_marginEnd="30dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageButton
    android:id="@+id/b1"
    android:layout_width="166dp"
    android:layout_height="166dp"
    android:layout_marginStart="30dp"
    android:layout_marginTop="50dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>

启动屏幕的XML代码

这些是MainActivity文件和启动屏幕的xml代码。

---

感谢您的帮助，我是android studio的新手，也是Stack Overflow（堆栈溢出）

请先转到menifest，然后像那样更改意图过滤器

<activity android:name=".SPLASH">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    </activity>

---

您正在从MainActivity调用启动屏幕，因此创建活动然后可视化启动是正常的；您应该按照@moon-answer进行操作，但有点错误：

您必须编辑AndroidManifest.xml以首先调用启动屏幕确保启动屏幕是一个活动：

---

XML文件不起作用，它必须写入启动屏幕的XML文件或主要活动的XML文件？？只需显示您的menifest.XML代码，我将更改为required并提及更改。请检查此链接，希望它能帮助您了解要点。谢谢，但您必须删除主链接中的意图

<activity android:name=".SPLASH">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    </activity>

int time = 3000;
new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        Intent i = new Intent(Splash_screen.this, MainActivity.class);
        startActivity(i);
        finish();
    }
}, time);

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="your.pack.age"
    android:installLocation="preferExternal" >

    <!-- Your permissions -->

    <application
        android:allowBackup="true"
        android:icon="@drawable/app_image" <!-- You'll have to modify these 3 lines -->
        android:label="@string/app_name"
        android:roundIcon="@drawable/app_round_image"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

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

        <activity
            android:name="com.pitibi.boulas.MainActivity"/>

    </application>
</manifest>

public class Splash_screen extends AppCompatActivity {

int time = 3000;

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

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent i = new Intent(Splash_screen.this, MainActivity.class);
            startActivity(i);
            finish();
        }
    }, time);