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當我到了下面，當我在測試一個ListView與自定義對象和咖啡Android咖啡測試。檢測的ListView
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)
這裏例外獲取IndexOutOfBoundsException異常是我MainActivity.java
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);
}
}
我的適配器類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的佈局文件
<?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>
的適配器
<?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>
佈局文件的應用也很好地工作
然後我說下面的測試類 「androidTest」 文件夾
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);
}
};
}
}
我得到了java.lang.I ndexOutOfBoundsException當我運行這個espresso測試。
我檢查變量值在調試模式下，這裏是android.support.test.espresso.action.AdapterViewProtocols $ StandardAdapterViewProtocol.getDataInAdapterView（）值
@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;
}
有誰知道爲什麼我得到了IndexOutOfBoundsException異常？
任何幫助表示讚賞。
順便說說，這裏是Person類的內容。 public class Person { public String _name; public String _description; public Person（String name，String desc）{ _name = name; _description = desc; } } –