title: Android Espresso: PerformException
body: <p>I`m getting</p>
  
  <blockquote>
    <p>android.support.test.espresso.PerformException: Error performing 'send
    keyCode: 4, metaState: 0 key event' on view 'Animations or transitions
    are enabled on the target device.</p>
  </blockquote>
  
  <p>I read articles with same error but didnt find answer.</p>
  
  <p>I have simple android app and I try to test simple thing:</p>
  
  <ol>
  <li>Load RecyclerView </li>
  <li>Click on RecyclerView`s item</li>
  <li>Open Activity</li>
  <li>Press button inside Activity</li>
  <li>Press back</li>
  <li>Repeat from part 1.</li>
  </ol>
  
  <p><strong>Code</strong> is extremely easy:</p>
  
  <pre><code>@Test
  public void getOver500Products() {
      onView(withId(R.id.drawer_layout)).perform(DrawerActions.open());
      onView(withId(R.id.layout2)).perform(click());
      clickExactItem(2);
      for (int i = 0; i&lt; 501; i++) {
          clickRandomItem();
          addedToCart();
          Espresso.pressBack();
      }
  }
  
  public void clickRandomItem() {
      try {
          int x = getRandomRecyclerPosition(R.id.list);
          clickExactItem(x);
      } catch (NoMatchingViewException e) {
      }
  }
  
  public void clickExactItem(int position) {
      onView(withId(R.id.list))
              .perform(RecyclerViewActions
                      .actionOnItemAtPosition(position, click()));
  }
  
  public boolean addedToCart() {
      try {
          onView(withId(R.id.product_add_in_cart)).perform(click());
      } catch (NoMatchingViewException e) {
          return false;
      }
      return true;
  }
  </code></pre>
  
  <p>It throws exception after 10-50 iterations (randomly) so basically code is right.</p>
  
  <p>EspressoTestDev.java:88 line where it crashes is</p>
  
  <pre><code>Espresso.pressBack();
  </code></pre>
  
  <p>Exactly after this line I`m getting exception.</p>
  
  <p><strong>Exception stacktrace:</strong></p>
  
  <pre><code>android.support.test.espresso.PerformException: Error performing 'send keyCode: 4, metaState: 0 key event' on view 'Animations or transitions are enabled on the target device.
  
  is a root view.'.
  at android.support.test.espresso.PerformException$Builder.build(PerformException.java:83)
  at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:80)
  at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:56)
  at android.support.test.espresso.ViewInteraction.runSynchronouslyOnUiThread(ViewInteraction.java:184)
  at android.support.test.espresso.ViewInteraction.doPerform(ViewInteraction.java:115)
  at android.support.test.espresso.ViewInteraction.perform(ViewInteraction.java:87)
  at android.support.test.espresso.Espresso.pressBack(Espresso.java:189)
  at com.app.myapp.EspressoTestDev.getOver500Products(EspressoTestDev.java:88)
  at java.lang.reflect.Method.invoke(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:372)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)
  at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:270)
  at org.junit.rules.RunRules.evaluate(RunRules.java:20)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.junit.runners.Suite.runChild(Suite.java:128)
  at org.junit.runners.Suite.runChild(Suite.java:27)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
  at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
  at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
  at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1851)
  Caused by: java.lang.RuntimeException: Action will not be performed because the target view does not match one or more of the following constraints:
  is displayed on the screen to the user
  Target view: "PopupViewContainer{id=-1, visibility=VISIBLE, width=0, height=0, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}"
  at android.support.test.espresso.ViewInteraction$1.run(ViewInteraction.java:138)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
  at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  at android.os.Handler.handleCallback(Handler.java:815)
  at android.os.Handler.dispatchMessage(Handler.java:104)
  at android.os.Looper.loop(Looper.java:194)
  at android.app.ActivityThread.main(ActivityThread.java:5549)
  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:964)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
  </code></pre>
  
  <p>Looks like it found problem with <code>PopupViewContainer</code> but I dont use it, dont click it and I have no idea how can it impact to <code>Espresso.pressBack()</code></p>
  
  <p><strong>What I tried:</strong></p>
  
  <ol>
  <li><p>Adding <code>getInstrumentation().waitForIdleSync();</code> before and after <code>Espresso.pressBack()</code></p></li>
  <li><p>Making delay as suggested <a href="https://stackoverflow.com/questions/21417954/espresso-thread-sleep">here</a></p></li>
  </ol>
  
  <p><strong>The question is:</strong> how can I <strong>avoid</strong> this error or how can I <strong>ignore</strong> and continue iterations in my case?</p>