How to do launch screen in Android

Issue #397

We recommend that, rather than disabling the preview window, you follow the common Material Design patterns. You can use the activity’s windowBackground theme attribute to provide a simple custom drawable for the starting activity.

styles.xml

<style name="LaunchTheme" parent="Theme.AppCompat.NoActionBar">
    <item name="android:windowBackground">@drawable/launch_background</item>
</style>

Set android:theme="@style/LaunchTheme" to activity element

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.onmyway133.whatsupintech">
    <uses-permission android:name="android.permission.INTERNET" />

    <application
            android:name=".MyApplication"
            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=".features.main.MainActivity"
                android:label="@string/app_name"
                android:theme="@style/LaunchTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        setTheme(R.style.AppTheme_NoActionBar)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
    }
}

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