单元测试onSaveInstanceState与ActivityRules

Question

我正试图找出如何使用较新的AndroidJunit4和活动规则测试onSavedInstance。

@RunWith(AndroidJUnit4.class)
public class MyViewActivityTest{
    @Rule
    public UiThreadTestRule uiThreadTestRule = new UiThreadTestRule();
    @Rule
    public ActivityTestRule<MyViewActivity> mActivityRule = new ActivityTestRule<>(MyViewActivity.class);
    @UiThreadTest
    @Test
    public void testOnSavedIntanceState() {
        uiThreadTestRule.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Intent in = new Intent();
                MyViewActivity activity = mActivityRule.launchActivity(in);
                activity.finish();
                activity.recreate();
            }
        });
    }

我得到一个错误，不确定我是否在正确的树。

. lang。IllegalStateException:必须从主线程调用android.app.Activity.recreate (Activity.java: 4620)

Answer 1

您应该能够使用注释@UiThreadTest运行测试。它适用于扩展UiThreadTestRule的每个测试规则。在这种情况下，ActivityTestRule恰好做到了这一点。

编辑:

@UiThreadTest
@Test
public void testOnUIThread() {
    // Test to run on UI thread
}

编辑:

我只是再次运行它，并记得你不能在UI线程上启动活动。我做了这个，并运行它没有任何并发症。

@RunWith(AndroidJUnit4.class)
public class TestActivity {
   @Rule
   public ActivityTestRule<MyViewActivity> activityRule = new ActivityTestRule<>(MyViewActivity.class, true, false);
   @Test
   public void testOnSavedInstanceState() throws Throwable {
       activityRule.launchActivity(new Intent());
       final Activity activity = activityRule.getActivity();
       activityRule.runOnUiThread(new Runnable() {
          @Override
          public void run() {
             activity.finish();
             activity.recreate();
          }
       });
  }