1/* 2 * Copyright (C) 2017 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 17package android.support.v4.widget; 18 19import static org.junit.Assert.assertEquals; 20import static org.junit.Assert.assertFalse; 21import static org.junit.Assert.assertTrue; 22 23import android.annotation.SuppressLint; 24import android.support.annotation.NonNull; 25import android.support.annotation.Nullable; 26import android.support.compat.test.R; 27import android.support.test.filters.SmallTest; 28import android.support.test.rule.ActivityTestRule; 29import android.support.v4.BaseInstrumentationTestCase; 30import android.view.LayoutInflater; 31import android.view.View; 32import android.view.ViewGroup; 33import android.view.ViewTreeObserver.OnGlobalLayoutListener; 34import android.widget.BaseAdapter; 35import android.widget.ListView; 36import android.widget.TextView; 37 38import junit.framework.Assert; 39 40import org.junit.Before; 41import org.junit.Test; 42 43import java.util.concurrent.CountDownLatch; 44import java.util.concurrent.TimeUnit; 45 46@SmallTest 47public class ListViewCompatTest extends BaseInstrumentationTestCase<ListViewTestActivity> { 48 private ListView mListView; 49 50 public ListViewCompatTest() { 51 super(ListViewTestActivity.class); 52 } 53 54 @Before 55 public void setUp() throws Throwable { 56 mListView = mActivityTestRule.getActivity().findViewById(R.id.content); 57 runOnMainAndLayoutSync(mActivityTestRule, mListView, new Runnable() { 58 @Override 59 public void run() { 60 mListView.setAdapter(new BaseAdapter() { 61 @Override 62 public int getCount() { 63 return 500; 64 } 65 66 @Override 67 public Object getItem(int position) { 68 return null; 69 } 70 71 @Override 72 public long getItemId(int position) { 73 return position; 74 } 75 76 @SuppressLint("SetTextI18n") 77 @Override 78 public View getView(int position, View convertView, ViewGroup parent) { 79 if (convertView == null) { 80 convertView = LayoutInflater.from(mListView.getContext()).inflate( 81 R.layout.list_view_row, parent, false); 82 } 83 TextView result = (TextView) convertView; 84 result.setText("row #" + (position + 1)); 85 return result; 86 } 87 }); 88 } 89 }, false); 90 } 91 92 private void runOnMainAndLayoutSync(@NonNull final ActivityTestRule activityTestRule, 93 @NonNull final View view, @Nullable final Runnable runner, final boolean forceLayout) 94 throws Throwable { 95 final View rootView = view.getRootView(); 96 97 final CountDownLatch latch = new CountDownLatch(1); 98 99 activityTestRule.runOnUiThread(new Runnable() { 100 @Override 101 public void run() { 102 final OnGlobalLayoutListener listener = new OnGlobalLayoutListener() { 103 @Override 104 public void onGlobalLayout() { 105 rootView.getViewTreeObserver().removeGlobalOnLayoutListener(this); 106 // countdown immediately since the layout we were waiting on has happened 107 latch.countDown(); 108 } 109 }; 110 111 rootView.getViewTreeObserver().addOnGlobalLayoutListener(listener); 112 113 if (runner != null) { 114 runner.run(); 115 } 116 117 if (forceLayout) { 118 rootView.requestLayout(); 119 } 120 } 121 }); 122 123 try { 124 Assert.assertTrue("Expected layout pass within 5 seconds", 125 latch.await(5, TimeUnit.SECONDS)); 126 } catch (InterruptedException e) { 127 throw new RuntimeException(e); 128 } 129 } 130 131 @Test 132 public void testCanScroll() throws Throwable { 133 final int itemCount = mListView.getAdapter().getCount(); 134 135 assertEquals(0, mListView.getFirstVisiblePosition()); 136 137 // Verify that when we're at the top of the list, we can't scroll up but we can scroll 138 // down. 139 assertFalse(ListViewCompat.canScrollList(mListView, -1)); 140 assertTrue(ListViewCompat.canScrollList(mListView, 1)); 141 142 // Scroll down to the very end of the list 143 runOnMainAndLayoutSync(mActivityTestRule, mListView, 144 new Runnable() { 145 @Override 146 public void run() { 147 mListView.setStackFromBottom(true); 148 } 149 }, false); 150 assertEquals(itemCount - 1, mListView.getLastVisiblePosition()); 151 152 // Verify that when we're at the bottom of the list, we can't scroll down but we can scroll 153 // up. 154 assertFalse(ListViewCompat.canScrollList(mListView, 1)); 155 assertTrue(ListViewCompat.canScrollList(mListView, -1)); 156 } 157} 158