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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.widget;
     18 
     19 import android.os.Parcelable;
     20 import android.support.v4.view.PagerAdapter;
     21 import android.text.TextUtils;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import com.android.settings.SettingsRobolectricTestRunner;
     25 import com.android.settings.TestConfig;
     26 import com.android.settings.testutils.shadow.ShadowTextUtils;
     27 import java.util.Locale;
     28 import org.junit.Before;
     29 import org.junit.Test;
     30 import org.junit.runner.RunWith;
     31 import org.robolectric.annotation.Config;
     32 import org.robolectric.shadows.ShadowApplication;
     33 
     34 import static com.google.common.truth.Truth.assertThat;
     35 
     36 @RunWith(SettingsRobolectricTestRunner.class)
     37 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
     38 public class RtlCompatibleViewPagerTest {
     39 
     40     private Locale mLocaleEn;
     41     private Locale mLocaleHe;
     42     private RtlCompatibleViewPager mViewPager;
     43 
     44     @Before
     45     public void setUp() {
     46         mViewPager = new RtlCompatibleViewPager(
     47                 ShadowApplication.getInstance().getApplicationContext());
     48         mViewPager.setAdapter(new ViewPagerAdapter());
     49         mLocaleEn = new Locale("en");
     50         mLocaleHe = new Locale("he");
     51     }
     52 
     53     @Test
     54     @Config(shadows = {ShadowTextUtils.class})
     55     public void testGetCurrentItem_shouldMaintainIndexDuringLocaleChange() {
     56         testRtlCompatibleInner(0);
     57         testRtlCompatibleInner(1);
     58     }
     59 
     60     private void testRtlCompatibleInner(int currentItem) {
     61         // Set up the environment
     62         Locale.setDefault(mLocaleEn);
     63         mViewPager.setCurrentItem(currentItem);
     64 
     65         assertThat(TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))
     66                 .isEqualTo(View.LAYOUT_DIRECTION_LTR);
     67         assertThat(mViewPager.getCurrentItem()).isEqualTo(currentItem);
     68 
     69         // Simulate to change the language to RTL
     70         Parcelable savedInstance = mViewPager.onSaveInstanceState();
     71         Locale.setDefault(mLocaleHe);
     72         mViewPager.onRestoreInstanceState(savedInstance);
     73 
     74         assertThat(TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))
     75                 .isEqualTo(View.LAYOUT_DIRECTION_RTL);
     76         assertThat(mViewPager.getCurrentItem()).isEqualTo(currentItem);
     77     }
     78 
     79     /**
     80      * Test viewpager adapter, uses 2 view to test it
     81      */
     82     private static final class ViewPagerAdapter extends PagerAdapter {
     83 
     84         private static final int ITEM_COUNT = 2;
     85 
     86         public ViewPagerAdapter() {
     87         }
     88 
     89         @Override
     90         public int getCount() {
     91             return ITEM_COUNT;
     92         }
     93 
     94         @Override
     95         public boolean isViewFromObject(View view, Object object) {
     96             return view == object;
     97         }
     98 
     99         @Override
    100         public Object instantiateItem(ViewGroup container, int position) {
    101             return null;
    102         }
    103 
    104         @Override
    105         public CharSequence getPageTitle(int position) {
    106             return null;
    107         }
    108     }
    109 }
    110