Android Espresso: PerformException

I`m getting

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.

I read articles with same error but didnt find answer.

I have simple android app and I try to test simple thing:

Load RecyclerView
Click on RecyclerView`s item
Open Activity
Press button inside Activity
Press back
Repeat from part 1.

Code is extremely easy:

@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< 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;
}

It throws exception after 10-50 iterations (randomly) so basically code is right.

EspressoTestDev.java:88 line where it crashes is

Espresso.pressBack();

Exactly after this line I`m getting exception.

Exception stacktrace:

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)

Looks like it found problem with PopupViewContainer but I dont use it, dont click it and I have no idea how can it impact to Espresso.pressBack()

What I tried:

Adding getInstrumentation().waitForIdleSync(); before and after Espresso.pressBack()
Making delay as suggested here

The question is: how can I avoid this error or how can I ignore and continue iterations in my case?

回答1:

Animations or transitions are enabled on the target device.

Espresso doesn't work well with animations due to the visual state delays they introduce. You need to disable animations on your device. Firstly, enable developer options:

Open the Settings app.
Scroll to the bottom and select About phone.
Scroll to the bottom and tap Build number 7 times.
Return to the previous screen to find Developer options near the bottom.

Access Developer Options from Settings app, and under the Drawing section, switch all of the following options to Animation Off:

Window animation scale
Transition animation scale
Animator duration scale

回答2:

ensure the control you want to work with is visible. this worked for me. add "scrollTo()"

onView(...).perform(scrollTo(), click());

回答3:

In addition to the accepted answer, if you want to open the emulator from console, you have to add the following commands:

    - adb shell settings put global window_animation_scale 0 &
    - adb shell settings put global transition_animation_scale 0 &
    - adb shell settings put global animator_duration_scale 0 &

回答4:

A simple try catch. Where you only pick up the exception if it is an PerformException.

Alternativ add the 500 items to your shopping cart by code, and then add 1 extra by UI test.