SplashScreen.java
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package id.ac.upgris.myapplication;

import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.widget.TextView;

public class SplashScreen extends AppCompatActivity {
    TextView tvSplash;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //menghilangkan ActionBar
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_splash_screen);
        tvSplash = (TextView) findViewById(R.id.tvSplash);
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                startActivity(new Intent(getApplicationContext(), MainActivity.class));
                finish(); //biar tidak kembali ke splash screen
            }
        }, 3000L); //3000 L = 3 detik
    }
}
AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="id.ac.upgris.myapplication">

    <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=".SplashScreen" android:label="@string/app_name"
            android:noHistory="true"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

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

</manifest>

Style.xml
-----------------
<resources>
    <!-- Base application theme. -->
    <style name="AppTheme.NoActionBar">
        <item name="windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="android:windowFullscreen">true</item>
        <item name="android:windowContentOverlay">@null</item>
    </style>
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

Activity_Spalash_Screen.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="id.ac.upgris.myapplication.SplashScreen"
android:id="@+id/splash_screen">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/background"
    android:scaleType="fitXY"/>

<TextView
    android:text="BEJO BANGET"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/tvSplash"
    android:textSize="30sp"
    android:textAlignment="center"
    android:fontFamily="sans-serif-smallcaps"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="37dp" />

<ProgressBar
    android:id="@+id/progresBar1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="80dp"/>

</RelativeLayout>