Add back dialog when disabling provider

Adds back a dialog that will ask the
user to confirm their choice when
disabling the last credman provider.

Test: ondevice & make
Bug: 267816757
Change-Id: Icefde62efe7daa9aad2da7ad9d3fd37e40b4376b

src/com/android/settings/applications/credentials/CredentialManagerPreferenceController.java

@@ -293,8 +293,19 @@ public class CredentialManagerPreferenceController extends BasePreferenceControl
 
                         return true;
                     } else {
-                        // Disable the provider.
-                        togglePackageNameDisabled(packageName);
+                        // If we are disabling the last enabled provider then show a warning.
+                        if (mEnabledPackageNames.size() <= 1) {
+                            final DialogFragment fragment =
+                                    newConfirmationDialogFragment(packageName, title, pref);
+
+                            if (fragment == null || mFragmentManager == null) {
+                                return true;
+                            }
+
+                            fragment.show(mFragmentManager, ConfirmationDialogFragment.TAG);
+                        } else {
+                            togglePackageNameDisabled(packageName);
+                        }
                     }
 
                     return true;
@@ -337,6 +348,29 @@ public class CredentialManagerPreferenceController extends BasePreferenceControl
         return new ErrorDialogFragment(host);
     }
 
+    private @Nullable ConfirmationDialogFragment newConfirmationDialogFragment(
+            @NonNull String packageName,
+            @NonNull CharSequence appName,
+            @NonNull SwitchPreference pref) {
+        DialogHost host =
+                new DialogHost() {
+                    @Override
+                    public void onDialogClick(int whichButton) {
+                        if (whichButton == DialogInterface.BUTTON_POSITIVE) {
+                            // Since the package is now enabled then we
+                            // should remove it from the enabled list.
+                            togglePackageNameDisabled(packageName);
+                        } else if (whichButton == DialogInterface.BUTTON_NEGATIVE) {
+                            // Set the checked back to true because we
+                            // backed out of turning this off.
+                            pref.setChecked(true);
+                        }
+                    }
+                };
+
+        return new ConfirmationDialogFragment(host, packageName, appName);
+    }
+
     private int getUser() {
         UserHandle workUser = getWorkProfileUser();
         return workUser != null ? workUser.getIdentifier() : UserHandle.myUserId();
@@ -386,4 +420,44 @@ public class CredentialManagerPreferenceController extends BasePreferenceControl
         @Override
         public void onClick(DialogInterface dialog, int which) {}
     }
+
+    /**
+     * Confirmation dialog fragment shows a dialog to the user to confirm that they are disabling a
+     * provider.
+     */
+    public static class ConfirmationDialogFragment extends CredentialManagerDialogFragment {
+
+        ConfirmationDialogFragment(
+                DialogHost dialogHost, @NonNull String packageName, @NonNull CharSequence appName) {
+            super(dialogHost);
+
+            final Bundle argument = new Bundle();
+            argument.putString(PACKAGE_NAME_KEY, packageName);
+            argument.putCharSequence(APP_NAME_KEY, appName);
+            setArguments(argument);
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            final Bundle bundle = getArguments();
+            final String title =
+                    getContext()
+                            .getString(
+                                    R.string.credman_confirmation_message_title,
+                                    bundle.getCharSequence(
+                                            CredentialManagerDialogFragment.APP_NAME_KEY));
+
+            return new AlertDialog.Builder(getActivity())
+                    .setTitle(title)
+                    .setMessage(getContext().getString(R.string.credman_confirmation_message))
+                    .setPositiveButton(R.string.credman_confirmation_message_positive_button, this)
+                    .setNegativeButton(android.R.string.cancel, this)
+                    .create();
+        }
+
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            getDialogHost().onDialogClick(which);
+        }
+    }
 }