Transparent Android app - No title bar -

MainActiviy.kt

package com.example.ziro.transaparentapp

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.WindowManager
import android.os.Build

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        //copy paste following code in any of your activity file - for java android studio will convert itself during pasting 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // works in kitkat & above 
            val w = window 
            w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)
        }

    }
}

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Translucent.NoTitleBar"> // use android:Theme.Wallpaper.NoTitleBar for parent if wallpaper is wanted as background
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>

        <item name="windowActionBar" >false</item>
        <item name="windowNoTitle">true</item>
      
    </style>

</resources>