SUW: (Not-really-)Spring Cleanup

* Remove unused imports
* Fix a few line length issues
* Convert a few anonymous classes to lambda expressions
* Convert a few global vars to locals
* Remove unused methods
* Add a small local method in MobileDataActivity to shorten repeated calls

Change-Id: Ia10be8b8c98ef3956949f913ddb6bddc185cf1a5

src/org/lineageos/setupwizard/WelcomeActivity.java

@@ -39,12 +39,9 @@ public class WelcomeActivity extends BaseSetupWizardActivity {
         setBackDrawable(null);
         mEnableAccessibilityController =
                 EnableAccessibilityController.getInstance(getApplicationContext());
-        mRootView.setOnTouchListener(new View.OnTouchListener() {
-            @Override
-            public boolean onTouch(View v, MotionEvent event) {
-                return mEnableAccessibilityController.onTouchEvent(event);
-            }
-        });
+        mRootView.setOnTouchListener((v, event) ->
+                mEnableAccessibilityController.onTouchEvent(event));
+
     }
 
     @Override