Change user setup prompt dialog showing logic

- Extract user setup prompt dialog creation logic
- Move user setup prompt dialog showing to UserDetailsSettings
- Rename user click and creation related methods to improve readability
- Set "disabled by admin" for switch pref when switch is disabled
- Cleanup UserSettings and UserDetailsSettings onPreferenceClick
- After a guest is created the details page opens instead of switching

Test: Manual test and robo tests with this command:
  make -j64 RunSettingsRoboTests
Demo: http://shortn/_ACYsnbIKO9
Bug: 156867277
Change-Id: Ifa0cdefcd49d5b865e940a7cc332136ed26ecf57

tests/robotests/src/com/android/settings/users/UserSettingsTest.java

@@ -33,13 +33,16 @@ import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
+import static org.robolectric.Shadows.shadowOf;
 
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.UserInfo;
 import android.graphics.Bitmap;
 import android.graphics.drawable.Drawable;
+import android.os.Bundle;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.provider.Settings;
@@ -53,6 +56,8 @@ import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceManager;
 import androidx.preference.PreferenceScreen;
 
+import com.android.settings.SettingsActivity;
+import com.android.settings.SubSettings;
 import com.android.settings.testutils.shadow.ShadowDevicePolicyManager;
 import com.android.settings.testutils.shadow.ShadowUserManager;
 import com.android.settingslib.RestrictedLockUtils;
@@ -70,6 +75,7 @@ import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.android.controller.ActivityController;
 import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowIntent;
 import org.robolectric.util.ReflectionHelpers;
 
 import java.util.Arrays;
@@ -589,6 +595,30 @@ public class UserSettingsTest {
         verify(mUserManager, times(2)).getUsers(true);
     }
 
+    @Test
+    public void onPreferenceClick_addGuestClicked_createGuestAndOpenDetails() {
+        UserInfo createdGuest = getGuest(false);
+        removeFlag(createdGuest, UserInfo.FLAG_INITIALIZED);
+        doReturn(createdGuest).when(mUserManager).createGuest(mActivity, "Guest");
+        doReturn(mActivity).when(mFragment).getContext();
+
+        mFragment.onPreferenceClick(mAddGuestPreference);
+
+        verify(mUserManager).createGuest(mActivity, "Guest");
+        Intent startedIntent = shadowOf(mActivity).getNextStartedActivity();
+        ShadowIntent shadowIntent = shadowOf(startedIntent);
+        assertThat(shadowIntent.getIntentClass()).isEqualTo(SubSettings.class);
+        assertThat(startedIntent.getStringExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT))
+                .isEqualTo(UserDetailsSettings.class.getName());
+        Bundle arguments = startedIntent.getBundleExtra(
+                SettingsActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS);
+        assertThat(arguments).isNotNull();
+        assertThat(arguments.getInt(UserDetailsSettings.EXTRA_USER_ID, 0))
+                .isEqualTo(createdGuest.id);
+        assertThat(arguments.getBoolean(AppRestrictionsFragment.EXTRA_NEW_USER, false))
+                .isEqualTo(true);
+    }
+
     @Test
     public void getRealUsersCount_onlyAdmin_shouldCount() {
         givenUsers(getAdminUser(true));