java - junit.framework.AssertionFailedError : Back button can't be pressed

Question

我这样做是为了退出使用 Android UIAutomator 的应用程序。

assertTrue("Back button can't be pressed", getUiDevice().pressBack());

assertTrue("Back button can't be pressed", getUiDevice().pressBack());   // This line will giving exception.

当我们按两次后退按钮时，我的应用程序将退出，这就是我调用它两次的原因。

但是

然后它会给我异常。

但是当我手动返回两次时它会完美地工作。

异常(exception)是:

junit.framework.AssertionFailedError: Back button can't be pressed
        at com.android.jdsu.automation.youtube.YoutubeUiTest.exitApplicaion(Yout
ubeUiTest.java:487)
        at com.android.jdsu.automation.youtube.YoutubeUiTest.testYouTube(Youtube
UiTest.java:208)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at com.android.uiautomator.testrunner.UiAutomatorTestRunner.start(UiAuto
matorTestRunner.java:160)
        at com.android.uiautomator.testrunner.UiAutomatorTestRunner.run(UiAutoma
torTestRunner.java:96)
        at com.android.commands.uiautomator.RunTestCommand.run(RunTestCommand.ja
va:91)
        at com.android.commands.uiautomator.Launcher.main(Launcher.java:83)
        at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
        at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:243)
        at dalvik.system.NativeStart.main(Native Method)

INSTRUMENTATION_STATUS: id=UiAutomatorTestRunner
INSTRUMENTATION_STATUS: test=testYouTube
INSTRUMENTATION_STATUS: class=com.android.jdsu.automation.youtube.YoutubeUiTest
INSTRUMENTATION_STATUS: stack=junit.framework.AssertionFailedError: Back button
can't be pressed
        at com.android.jdsu.automation.youtube.YoutubeUiTest.exitApplicaion(Yout
ubeUiTest.java:487)
        at com.android.jdsu.automation.youtube.YoutubeUiTest.testYouTube(Youtube
UiTest.java:208)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at com.android.uiautomator.testrunner.UiAutomatorTestRunner.start(UiAuto
matorTestRunner.java:160)
        at com.android.uiautomator.testrunner.UiAutomatorTestRunner.run(UiAutoma
torTestRunner.java:96)
        at com.android.commands.uiautomator.RunTestCommand.run(RunTestCommand.ja
va:91)
        at com.android.commands.uiautomator.Launcher.main(Launcher.java:83)
        at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
        at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:243)
        at dalvik.system.NativeStart.main(Native Method)

Answer 1

是的，我也遇到过同样的问题，但不明白为什么会这样。我通过使用如下方法让它工作:

UiDevice device = UiDevice.getInstance();
device.pressMenu();

这对我来说很好用。否则你也可以使用 keyevent 如下:

Runtime.getRuntime().exec("/system/bin/input keyevent 82");