Androidエスプレッソテスト。リストビュー

Question

をテスト私はカスタマイズされたオブジェクトとエスプレッソここ

I/TestRunner: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) 
at java.util.ArrayList.get(ArrayList.java:308) 
at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:337) 
at android.widget.AdapterView.getItemAtPosition(AdapterView.java:997) 
at android.support.test.espresso.action.AdapterViewProtocols$StandardAdapterViewProtocol.getDataInAdapterView(AdapterViewProtocols.java:93) 
at android.support.test.espresso.action.AdapterDataLoaderAction.perform(AdapterDataLoaderAction.java:80) 
at android.support.test.espresso.ViewInteraction$1.run(ViewInteraction.java:144) 
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:6873) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 

とリストビューをテストしていた例外を以下しまったときはIndexOutOfBoundsExceptionを取得することは、私のMainActivity.javaある

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     final TextView textView = (TextView)findViewById(R.id.textView); 
     ListView listView = (ListView)findViewById(R.id.myListView); 

     ArrayList<Person> items = new ArrayList(); 
     for(int i=0; i<10; i++){ 
      items.add(new Person("name"+i, "desc"+i)); 
     } 
     ListViewAdapter adapter = new ListViewAdapter(this, R.layout.list_item, items); 
     listView.setAdapter(adapter); 

     AdapterView.OnItemClickListener mMessageClickedHandler = new AdapterView.OnItemClickListener() { 
      public void onItemClick(AdapterView parent, View v, int position, long id) { 
       textView.setText("" + position); 
      } 
     }; 
     listView.setOnItemClickListener(mMessageClickedHandler); 
    } 
} 

マイアダプタクラスListViewAdapter.java

public class ListViewAdapter extends ArrayAdapter<Person>{ 

    private final List<Person> _products; 
    private final int _layout; 

    public ListViewAdapter(@NonNull Context context, @LayoutRes int resource, List<Person> products) { 
     super(context, resource); 
     _layout = resource; 
     _products = products; 
    } 

    @Override 
    public View getView(int position, View convertview, ViewGroup parent) 
    { 
     View rowView = convertview; 
     if(convertview==null) { 
      LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      rowView = inflater.inflate(_layout, parent, false); 
     } 

     ((TextView)rowView.findViewById(R.id.productName)).setText(_products.get(position)._name); 
     ((TextView)rowView.findViewById(R.id.description)).setText(_products.get(position)._description); 

     return rowView; 
    } 

    @Override 
    public int getCount(){ 
     return _products.size(); 
    } 
} 

MainActivityのレイアウトファイル

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context="com.example.seanshi.testespresso2.MainActivity"> 

    <TextView 
     android:id="@+id/textView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Hello World!"/> 

    <ListView 
     android:id="@+id/myListView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" /> 
</LinearLayout> 

アプリは "androidTest" フォルダ内にも

は、その後、私は後に追加のテストクラスを動作しないアダプタ

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <TextView 
     android:id="@+id/productName" 
     android:layout_width="100dp" 
     android:layout_height="50dp" /> 

    <TextView 
     android:id="@+id/description" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" /> 
</LinearLayout> 

ためのレイアウトファイル

package com.example.seanshi.testespresso2; 

import android.support.test.espresso.matcher.BoundedMatcher; 
import android.support.test.filters.SmallTest; 
import android.support.test.rule.ActivityTestRule; 
import android.support.test.runner.AndroidJUnit4; 

import org.hamcrest.Description; 
import org.hamcrest.Matcher; 
import org.junit.Rule; 
import org.junit.Test; 
import org.junit.runner.RunWith; 

import static android.support.test.espresso.Espresso.onData; 
import static android.support.test.espresso.Espresso.onView; 
import static android.support.test.espresso.action.ViewActions.click; 
import static android.support.test.espresso.assertion.ViewAssertions.matches; 
import static android.support.test.espresso.core.deps.guava.base.Preconditions.checkNotNull; 
import static android.support.test.espresso.matcher.ViewMatchers.withId; 
import static android.support.test.espresso.matcher.ViewMatchers.withText; 
import static org.hamcrest.Matchers.equalTo; 

@RunWith(AndroidJUnit4.class) 
@SmallTest 
public class ListViewTest { 
    @Rule 
    public ActivityTestRule<MainActivity> mActivityRule = new ActivityTestRule<MainActivity>(MainActivity.class); 

    @Test 
    public void testListView() 
    { 
     // withItemContent() is a customized matcher 
     onData(withItemContent("name1")).inAdapterView(withId(R.id.myListView)).perform(click()); 
     onView(withId(R.id.textView)).check(matches(withText("1"))); 
    } 

    public static Matcher<Object> withItemContent(final String expectedText) { 
     checkNotNull(expectedText); 
     return withItemContent(equalTo(expectedText)); 
    } 

    public static Matcher<Object> withItemContent(final Matcher<String> itemTextMatcher) { 
     checkNotNull(itemTextMatcher); 
     return new BoundedMatcher<Object, Person>(Person.class) { 
      @Override 
      public boolean matchesSafely(Person person) { 
       return itemTextMatcher.matches(person._name); 
      } 

      @Override 
      public void describeTo(Description description) { 
       description.appendText("with item content: "+itemTextMatcher.toString()); 
       itemTextMatcher.describeTo(description); 
      } 
     }; 
    } 
} 

私はjava.lang.Iを持っていますこのエスプレッソテストを実行するとndexOutOfBoundsExceptionが発生します。

私はandroid.support.test.espresso.action.AdapterViewProtocols $ StandardAdapterViewProtocol.getDataInAdapterView（中値はここでは、デバッグモードで変数の値をチェックする）

@Override 
public Iterable<AdaptedData> getDataInAdapterView(AdapterView<? extends Adapter> adapterView) { 
    List<AdaptedData> datas = Lists.newArrayList(); 
    for (int i = 0; i < adapterView.getCount(); i++) {  // getCount() return 10 
    int position = i; 
    Object dataAtPosition = adapterView.getItemAtPosition(position); // but getItemAtPosition(0) throws IndexOutOfBoundsException 
    datas.add(
     new AdaptedData.Builder() 
      .withDataFunction(new StandardDataFunction(dataAtPosition, position)) 
      .withOpaqueToken(position) 
      .build()); 
    } 
    return datas; 
} 

私ははIndexOutOfBoundsExceptionを得た理由を誰もが知っていますか？

何か助けていただければ幸いです。

Answer 1

私はその理由を発見しました。これは、私のアダプタで新しいList変数を定義し、基本クラスArrayAdapterの変数 "List mObjects"に値を設定しなかったためです。