Small improvement

app/src/main/java/eu/faircode/email/ActivityBase.java

@@ -44,6 +44,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
+import android.view.inputmethod.InputMethodManager;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;

app/src/main/java/eu/faircode/email/FragmentBase.java

@@ -22,6 +22,7 @@ package eu.faircode.email;
 import static android.app.ActionBar.DISPLAY_SHOW_CUSTOM;
 import static android.app.Activity.RESULT_OK;
 
+import android.app.Activity;
 import android.app.RecoverableSecurityException;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -36,6 +37,7 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.ResultReceiver;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -347,7 +349,7 @@ public class FragmentBase extends Fragment {
         try {
             FragmentActivity activity = getActivity();
             if (activity != null) {
-                InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
+                InputMethodManager imm = Helper.getSystemService(activity, InputMethodManager.class);
                 View focused = activity.getCurrentFocus();
                 if (imm != null && focused != null)
                     imm.hideSoftInputFromWindow(focused.getWindowToken(), 0);

app/src/main/java/eu/faircode/email/Helper.java

@@ -1493,8 +1493,7 @@ public class Helper {
 
     static void showKeyboard(final View view) {
         final Context context = view.getContext();
-        InputMethodManager imm =
-                (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
+        InputMethodManager imm = Helper.getSystemService(context, InputMethodManager.class);
         if (imm == null)
             return;
 
@@ -1513,8 +1512,7 @@ public class Helper {
 
     static void hideKeyboard(final View view) {
         final Context context = view.getContext();
-        InputMethodManager imm =
-                (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
+        InputMethodManager imm = Helper.getSystemService(context, InputMethodManager.class);
         if (imm == null)
             return;