单元测试onSaveInstanceState与ActivityRules

Question

我想弄清楚如何使用较新的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(); 
      } 
     }); 
    } 

我得到一个错误不知道如果我吠叫正确的树。

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

Answer 1

叫你应该能够运行与注释@UiThreadTest测试。它适用于每个延伸UiThreadTestRule的测试规则。在这种情况下，ActivityTestRule恰好可以做到这一点。

编辑：

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

编辑：

我再跑了它，记住，你不能启动UI线程上的活动。我做到了这一点，并没有发生并发症。

@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(); 
      } 
     }); 
    }