The Activity Must Be Exported or Contain an Intent-Filter

Error running second Activity: The activity must be exported or contain an intent-filter

Put android:exported="true" in the <activity> tag

<activity android:name=".secondActivity"
    android:exported="true">

Error running 'splash': The activity must be exported or contain an intent-filter

You should switch intent-filter from MainActivity to splash.

Below you will find the solution:

<application
    android:allowBackup="true"
    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=".splash">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <activity android:name=".MainActivity"/>
</application>

Don't forget to extend AppCompatActivity in splash.

Also, I recommend to rename splash to SplashActivity

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