Google Associate-Android-Developer 問題集

質問 1：
In a class extended PreferenceFragmentCompat. What method is used to inflate the given XML resource and add the preference hierarchy to the current preference hierarchy?
A. findPreference
B. getPreferenceManager
C. setPreferenceScreen
D. addPreferencesFromResource
正解：D

質問 2：
Custom duration in milliseconds as a parameter for the setDuration method is available when you are working with:
A. Toast
B. for both of them
C. for none of them
D. Snackbar
正解：D

質問 3：
The following code snippet shows an example of an Espresso test:
A. @Rule
fun greeterSaysHello() {
onView(withId(R.id.name_field)).do(typeText("Steve"))
onView(withId(R.id.greet_button)).do(click())
onView(withText("Hello Steve!")).check(matches(isDisplayed()))
}
B. @Test
fun greeterSaysHello() {
onView(withId(R.id.name_field)).do(typeText("Steve"))
onView(withId(R.id.greet_button)).do(click())
onView(withText("Hello Steve!")).compare(matches(isDisplayed()))
}
C. @Test
fun greeterSaysHello() {
onView(withId(R.id.name_field)).perform(typeText("Steve"))
onView(withId(R.id.greet_button)).perform(click())
onView(withText("Hello Steve!")).check(matches(isDisplayed()))
}
正解：C

質問 4：
Android Tests. You can use the childSelector() method to nest multiple UiSelector instances. For example, the following code example shows how your test might specify a search to find the first ListView in the currently displayed UI, then search within that ListView to find a UI element with the text property Apps.
What is the correct sample?
A. val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView")
.instance(
UiSelector().text("Apps")
)
)
B. val appItem: UiObject = device.findObject( UiSelector().className(ListView.class)
.instance(1)
.childSelector(
UiSelector().text("Apps")
)
)
C. val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView")
.instance(0)
.childSelector(
UiSelector().text("Apps")
)
)
正解：C

質問 5：
To run your local unit tests, follow these steps:
1. Be sure your project is synchronized with Gradle by clicking Sync Project in the toolbar.
2. Run your test in one of the following ways (select possible): (Choose three.)
A. To test all methods in a class, right-click a class or method in the test file and click Run .
B. To run all tests in Project, open the Project window, and then right-click a test and click Run .
C. To run a single test, open the Project window, and then right-click a test and click Run .
D. To run all tests in a directory, right-click on the directory and select Run tests .
正解：A,C,D

質問 6：
LiveData.postValue() and LiveData.setValue() methods have some differences. So if you have a following code executed in the main thread:
liveData.postValue("a"); liveData.setValue("b");
What will be the correct statement?
A. The value "a" would be set at first and would not be overridden with the value "b".
B. The value "b" would be set at first and later the main thread would override it with the value "a".
C. The value "a" would be set at first and later the main thread would override it with the value "b".
D. The value "b" would be set at first and would not be overridden with the value "a".
正解：C

質問 7：
For example, we have a file in our assets folder app/src/main/assets/sample_teas.json. To get an InputStream for reading it, from out Context context, we can try do this:
A. val input = context!!.resources.assets.open("sample_teas.json")
B. val input = context!!.resources.openRawResource(R.raw.sample_teas)
C. val input = context!!.assets.open("sample_teas.json")
正解：C