A basic splash screen

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.package"
    android:versionCode="1"
    android:versionName="1.0" >

    <application
        android:allowBackup="false"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".Splash"
            android:label="@string/app_name"
             >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

    </application>

</manifest>

public class Splash extends Activity{

    public final int SPLASH_DISPLAY_LENGTH = 3000;

    private void checkPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WAKE_LOCK) != PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(this,Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_NETWORK_STATE) != PackageManager.PERMISSION_GRANTED) {//Can add more as per requirement

            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.WAKE_LOCK,
                            Manifest.permission.INTERNET,
                            Manifest.permission.ACCESS_NETWORK_STATE},
                    123);
        }

    }
    @Override
    protected void onCreate(Bundle sis){
        super.onCreate(sis);
        //set the content view. The XML file can contain nothing but an image, such as a logo or the app icon
        setContentView(R.layout.splash);

        //we want to display the splash screen for a few seconds before it automatically
        //disappears and loads the game. So we create a thread:
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                
                //request permissions. NOTE: Copying this and the manifest will cause the app to crash as the permissions requested aren't defined in the manifest. 
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ) {
                        checkPermission();
                    }
                    String lang = [load or determine the system language and set to default if it isn't available.]
                    Locale locale = new Locale(lang);
                    Locale.setDefault(locale);
                    Configuration config = new Configuration    ();
                    config.locale = locale;
                    Splash.this.getResources().updateConfiguration(config,
                            Splash.this.getResources().getDisplayMetrics())   ;

                    //after three seconds, it will execute all of this code.
                    //as such, we then want to redirect to the master-activity
                    Intent mainIntent = new Intent(Splash.this, MainActivity.class);
                    Splash.this.startActivity(mainIntent);

                //then we finish this class. Dispose of it as it is longer needed
                Splash.this.finish();
            }
        }, SPLASH_DISPLAY_LENGTH);

    }

    public void onPause(){
        super.onPause();
        finish();
    }

}