Settings Fragment Migration (Build pass app)

This patch focused on fixing compile errors and some runtime errors.

Test: We can't test it now. But we will have an integration test later.
Bug: 110259478
Change-Id: I16c471ddcd0fa1460c665b7f74d86fcace5ee67b

src/com/android/settings/wifi/WifiScanModeActivity.java

@@ -16,7 +16,6 @@
 
 package com.android.settings.wifi;
 
-import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
@@ -32,11 +31,12 @@ import com.android.settings.R;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
 
 import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentActivity;
 
 /**
  * This activity requests users permission to allow scanning even when Wi-Fi is turned off
  */
-public class WifiScanModeActivity extends Activity {
+public class WifiScanModeActivity extends FragmentActivity {
     private DialogFragment mDialog;
     private String mApp;
 
@@ -67,7 +67,7 @@ public class WifiScanModeActivity extends Activity {
     private void createDialog() {
         if (mDialog == null) {
             mDialog = AlertDialogFragment.newInstance(mApp);
-            mDialog.show(getFragmentManager(), "dialog");
+            mDialog.show(getSupportFragmentManager(), "dialog");
         }
     }