如何调用Button.performClick在Android的JUnit测试案例？ [英] How to call Button.performClick in Android JUnit test case?
问题描述
我是新来的Android测试的东西。我想测试，如果点击一个按钮将打开一个相应的活动或没有。我做了一些研究，发现我将需要使用ActivityManager做检查。
I'm new to Android Testing stuff. I'd like to test if clicking a button will open up a corresponding activity or not. I did some research and found out that I will need to use ActivityManager to do the checking.
但问题是，我不能让点击的一部分工作。我试图使用 Button.performClick（）。
Problem is, I can't get the "clicking" part working. I'm trying to use Button.performClick().
起初，我只是调用该函数，并得到了一个错误，说我不能在当前线程中执行此操作。一些谷歌上搜索后，我发现我需要调用它的UI线程，和碰到 runOnUiThread（Runnable的R）方法。
Initially I just called this function, and got an error saying that I can't do this in the current thread. After some googling I found out that I need to call it in the UI thread, and came across runOnUiThread(Runnable r) method.
按钮我想点击的 _helloButton _ 。这是在获得_setup（）方法_ 。我做了 _assertNotNull _ 检查是为了确保它的存在。
The button I'm trying to click is _helloButton_. This is obtained in the _setUp()_ method. I did _assertNotNull_ check on this to make sure it's there.
在一个测试方法，我称之为
Within a test method, I call
mActivity.runOnUiThread(new Runnable() {
public void run() {
helloButton.requestFocus();
}
});
helloButton.performClick();
和我得到一个NPE在排队叫号不是requestFocus（）。
and I get a NPE at the line calling requestFocus().
接下来我想
mActivity.runOnUiThread(new Runnable() {
public void run() {
helloButton.performClick();
}
});
和仍然得到同样的空指针异常。
and still get the same null pointer exception.
在JUnit的角度来看，我得到这个消息
On the JUnit perspective, I get this message
Test failed to run to completion. Reason: 'Instrumentation run failed due to 'java.lang.NullPointerException''. Check device logcat for details
和堆栈跟踪是这样的。
08-05 19:03:11.922: ERROR/AndroidRuntime(578): Uncaught handler: thread main exiting due to uncaught exception
08-05 19:03:11.922: ERROR/AndroidRuntime(578): java.lang.NullPointerException
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at com.example.helloworldmk2.test.HelloWorldMK2Test$1.run(HelloWorldMK2Test.java:57)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at android.os.Handler.handleCallback(Handler.java:587)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at android.os.Handler.dispatchMessage(Handler.java:92)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at android.os.Looper.loop(Looper.java:123)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at java.lang.reflect.Method.invokeNative(Native Method)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at java.lang.reflect.Method.invoke(Method.java:521)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-05 19:03:11.922: ERROR/AndroidRuntime(578): at dalvik.system.NativeStart.main(Native Method)
57号线在这里我打电话了 helloButton.performClick（）。
我不知道为什么我收到NPE; assertNotNull通过没有问题。如果你能帮助我解决这个问题，我真的AP preciate它。先谢谢了。
I'm not sure why I'm getting NPE; assertNotNull passes without problem. If you can help me with this issue, I'd really appreciate it. Thanks in advance.
编辑：我继承ActivityInstrumentationTestCase2这个特定测试类
I'm subclassing ActivityInstrumentationTestCase2 for this particular test class.
EDIT2：logcat的喷出了一些错误，NPE发生之前
Logcat spews out some errors before NPE happens.
我看
08-05 20：08：54.702：ERROR / AndroidRuntime（754）：错误：线程附加失败。
08-05 20:08:54.702: ERROR/AndroidRuntime(754): ERROR: thread attach failed
和
08-05 20：08：58.642：ERROR / gralloc（52）：[注销]处理0x3e1b28仍处于锁定状态（状态= 40000001）
08-05 20:08:58.642: ERROR/gralloc(52): [unregister] handle 0x3e1b28 still locked (state=40000001)
推荐答案
您可以标注您的测试，UI线程上运行：
You can annotate your test to run on UI thread:
@UiThreadTest
public void testNoErrorInCapitalization() {
final String msg = "this is a sample";
mMessage.setText(msg);
mCapitalize.performClick();
final String actual = mMessage.getText().toString();
final String notExpectedRegexp = "(?i:ERROR)";
assertNotContainsRegex("Capitalization found error:",
notExpectedRegexp, actual);
}
这是从
这篇关于如何调用Button.performClick在Android的JUnit测试案例？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
