diff --git a/app/src/main/java/net/kdt/pojavlaunch/MCLauncherActivity.java b/app/src/main/java/net/kdt/pojavlaunch/MCLauncherActivity.java
index 92f1789af..486dd5acc 100644
--- a/app/src/main/java/net/kdt/pojavlaunch/MCLauncherActivity.java
+++ b/app/src/main/java/net/kdt/pojavlaunch/MCLauncherActivity.java
@@ -67,13 +67,29 @@ public class MCLauncherActivity extends AppCompatActivity
 	protected void onCreate(Bundle savedInstanceState)
 	{
 		super.onCreate(savedInstanceState);
-
 		gson = new Gson();
 
 		DisplayMetrics dm = Tools.getDisplayMetrics(this);
 		AndroidDisplay.windowWidth = dm.widthPixels;
 		AndroidDisplay.windowHeight = dm.heightPixels;
 		viewInit();
+		
+	   final View decorView = getWindow().getDecorView();
+       decorView.setOnSystemUiVisibilityChangeListener (new View.OnSystemUiVisibilityChangeListener() {
+        @Override
+        public void onSystemUiVisibilityChange(int visibility) {
+            if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
+                decorView.setSystemUiVisibility(
+                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+            }
+        }
+    });	
+		
+		
 	}
 	// DEBUG
 	//new android.support.design.widget.NavigationView(this);
@@ -400,9 +416,11 @@ public class MCLauncherActivity extends AppCompatActivity
 	}
 
 	@Override
-	protected void onResume()
-	{
+	protected void onResume(){
 		super.onResume();
+        final int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+        final View decorView = getWindow().getDecorView();
+        decorView.setSystemUiVisibility(uiOptions);
 	}
 
 	private boolean canBack = false;
diff --git a/app/src/main/java/net/kdt/pojavlaunch/MainActivity.java b/app/src/main/java/net/kdt/pojavlaunch/MainActivity.java
index 45f5440c1..048ab902b 100644
--- a/app/src/main/java/net/kdt/pojavlaunch/MainActivity.java
+++ b/app/src/main/java/net/kdt/pojavlaunch/MainActivity.java
@@ -121,8 +121,7 @@ public class MainActivity extends AppCompatActivity implements OnTouchListener,
 	private boolean lastGrab = false;
 	private boolean isExited = false;
 	private boolean isLogAllow = false;
-	private int navBarHeight;
-    private Object screenWidth;
+	private int navBarHeight = 40;
 
 	// private static Collection<? extends Provider.Service> rsaPkcs1List;
 
@@ -662,7 +661,7 @@ public class MainActivity extends AppCompatActivity implements OnTouchListener,
 						egl10.eglMakeCurrent(AndroidContextImplementation.display, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
 						System.out.println(new StringBuffer().append("Gave up context: ").append(AndroidContextImplementation.context).toString());
 
-						AndroidDisplay.windowWidth =+ navBarHeight;
+						AndroidDisplay.windowWidth += navBarHeight;
 						
 						new Thread(new Runnable(){
 
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 6632fe3ae..c307ebe76 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -7,6 +7,7 @@
 		<item name="android:windowContentOverlay">@null</item>
 		<item name="android:windowFullscreen">true</item>
 		<item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material</item>
+        <item name="android:windowTranslucentNavigation">true</item>
 	</style>
 	
 	<style name="RunTheme" parent="@style/Theme.AppCompat.NoActionBar">
@@ -14,6 +15,7 @@
 		<item name="windowActionBar">false</item>
 		<item name="android:windowContentOverlay">@null</item>
 		<item name="android:windowFullscreen">true</item>
+        <item name="android:windowTranslucentNavigation">true</item>
 	</style>
 	
     <style name="AlertTheme" parent="@android:style/Theme.Material">
@@ -28,14 +30,17 @@
 		<item name="android:windowContentOverlay">@null</item>
 		<item name="android:windowAnimationStyle">@style/MenuDialogAnimation</item>
 		<item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
+        <item name="android:windowTranslucentNavigation">true</item>
 	   </style>
 	
 	<style name="MenuDialogAnimation">
 		<item name="android:windowEnterAnimation">@anim/translate_left_side</item>
 		<item name="android:windowExitAnimation">@anim/translate_right_side</item>
+        <item name="android:windowTranslucentNavigation">true</item>
 	</style>
 	
 	<style name="SpinnerChangeLanguage">
+        <item name="android:windowTranslucentNavigation">true</item>
 		<item name="android:background">@drawable/spinner_change_language</item>
 	</style>
 </resources>