make screen 'rotatable' only on tablets

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.uberspot.a2048"
-    android:versionCode="9"
-    android:versionName="1.8" >
+    android:versionCode="13"
+    android:versionName="1.88" >
 
     <uses-sdk
         android:minSdkVersion="10"

src/com/uberspot/a2048/MainActivity.java

@@ -1,13 +1,14 @@
 package com.uberspot.a2048;
 
-import com.uberspot.a2048.R;
-
-import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.SharedPreferences;
+import android.content.pm.ActivityInfo;
 import android.content.res.Configuration;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
 import android.view.Menu;
 import android.view.MotionEvent;
 import android.view.View;
@@ -29,32 +30,54 @@ public class MainActivity extends Activity {
 	private long mLastTouch;
 	private static final long mTouchThreshold = 2000;
 	private Toast pressBackToast;
-	
+
 	@SuppressLint("SetJavaScriptEnabled")
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
-
+
+		// Don't show an action bar or title
 		requestWindowFeature(Window.FEATURE_NO_TITLE);
+
+		// Apply previous setting about showing status bar or not
 		applyFullScreen(isFullScreen());
-
+
+		// Check if screen rotation is locked in settings
+		boolean isOrientationEnabled = false;
+        try {
+            isOrientationEnabled = Settings.System.getInt(getContentResolver(),
+                    Settings.System.ACCELEROMETER_ROTATION) == 1;
+        } catch (SettingNotFoundException e) { }
+
+        // If rotation isn't locked and it's a LARGE screen then add orientation changes based on sensor
+        int screenLayout = getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK;
+		if ( (screenLayout == Configuration.SCREENLAYOUT_SIZE_LARGE
+		        || screenLayout == Configuration.SCREENLAYOUT_SIZE_XLARGE )
+		            && isOrientationEnabled) {
+			setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_SENSOR);
+		}
+
 		setContentView(R.layout.activity_main);
-
+
+		// Load webview with game
 		mWebView = (WebView) findViewById(R.id.mainWebView);
 		WebSettings settings = mWebView.getSettings();
 		String packageName = getPackageName();
 		settings.setJavaScriptEnabled(true);
 		settings.setDomStorageEnabled(true);
 		settings.setDatabaseEnabled(true);
 		settings.setDatabasePath("/data/data/" + packageName + "/databases");
-
+
+		// If there is a previous instance restore it in the webview
 		if (savedInstanceState != null) {
 			mWebView.restoreState(savedInstanceState);
 	    } else {
 	    	mWebView.loadUrl("file:///android_asset/2048/index.html");
 	    }
-		Toast.makeText(getApplication(), 
+
+		Toast.makeText(getApplication(),
 				R.string.toggle_fullscreen, Toast.LENGTH_SHORT).show();
+		// Set fullscreen toggle on webview LongClick
 		mWebView.setOnTouchListener(new OnTouchListener() {
 			@Override
 			public boolean onTouch(View v, MotionEvent event) {
@@ -75,23 +98,23 @@ public boolean onTouch(View v, MotionEvent event) {
 				// by the webview as well
 				return false;
 			}});
-		
-		pressBackToast = Toast.makeText(getApplicationContext(), 
+
+		pressBackToast = Toast.makeText(getApplicationContext(),
 				R.string.press_back_again_to_exit, Toast.LENGTH_SHORT);
 	}
 
 	@Override
 	protected void onSaveInstanceState(Bundle outState) {
 		mWebView.saveState(outState);
 	}
-	
+
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
 		// Inflate the menu; this adds items to the action bar if it is present.
 		//getMenuInflater().inflate(R.menu.main, menu);
 		return true;
 	}
-	
+
 	private void saveFullScreen(boolean isFullScreen) {
 		// save in preferences
 		SharedPreferences.Editor editor = PreferenceManager
@@ -105,7 +128,11 @@ private boolean isFullScreen() {
 				.getDefaultSharedPreferences(this)
 				.getBoolean(IS_FULLSCREEN_PREF, DEF_FULLSCREEN);
 	}
-
+
+	/**
+	 * Toggles the activitys fullscreen mode by setting the corresponding window flag
+	 * @param isFullScreen
+	 */
 	private void applyFullScreen(boolean isFullScreen) {
 		if(isFullScreen) {
 			getWindow().clearFlags(LayoutParams.FLAG_FULLSCREEN);
@@ -114,12 +141,12 @@ private void applyFullScreen(boolean isFullScreen) {
 	            WindowManager.LayoutParams.FLAG_FULLSCREEN);
 		}
 	}
-	
+
 	@Override
 	public void onConfigurationChanged(Configuration newConfig) {
 	  super.onConfigurationChanged(newConfig);
 	}
-	
+
 	@Override
 	public void onBackPressed() {
 	    long currentTime = System.currentTimeMillis();