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Android 使用浓缩咖啡时出现空指针异常_Android_Android Espresso - Fatal编程技术网

Android 使用浓缩咖啡时出现空指针异常

Android 使用浓缩咖啡时出现空指针异常,android,android-espresso,Android,Android Espresso,我想用浓缩咖啡。但是我犯了这个错误,我不知道我是否丢失了一些代码 任何想法都将受到高度赞赏 错误日志: java.lang.NullPointerException: No instrumentation registered. Must run under a registering instrumentation. at com.google.android.apps.common.testing.testrunner.util.Checks.checkNotNull(Checks.

我想用浓缩咖啡。但是我犯了这个错误,我不知道我是否丢失了一些代码

任何想法都将受到高度赞赏

错误日志:

java.lang.NullPointerException: No instrumentation registered. Must run under a registering instrumentation.
    at com.google.android.apps.common.testing.testrunner.util.Checks.checkNotNull(Checks.java:28)
    at com.google.android.apps.common.testing.testrunner.InstrumentationRegistry.getInstance(InstrumentationRegistry.java:23)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule.provideTargetContext(BaseLayerModule.java:50)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideTargetContextProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:101)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideTargetContextProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:85)
    at com.google.android.apps.common.testing.ui.espresso.base.DefaultFailureHandler$$InjectAdapter.get(DefaultFailureHandler$$InjectAdapter.java:53)
    at com.google.android.apps.common.testing.ui.espresso.base.DefaultFailureHandler$$InjectAdapter.get(DefaultFailureHandler$$InjectAdapter.java:20)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideFailureHanderProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:555)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideFailureHanderProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:519)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$FailureHandlerHolder$$InjectAdapter.get(BaseLayerModule$FailureHandlerHolder$$InjectAdapter.java:53)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$FailureHandlerHolder$$InjectAdapter.get(BaseLayerModule$FailureHandlerHolder$$InjectAdapter.java:20)
    at dagger.internal.Linker$SingletonBinding.get(Linker.java:327)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideFailureHandlerProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:505)
    at com.google.android.apps.common.testing.ui.espresso.base.BaseLayerModule$$ModuleAdapter$ProvideFailureHandlerProvidesAdapter.get(BaseLayerModule$$ModuleAdapter.java:469)
    at com.google.android.apps.common.testing.ui.espresso.ViewInteraction$$InjectAdapter.get(ViewInteraction$$InjectAdapter.java:65)
    at com.google.android.apps.common.testing.ui.espresso.ViewInteraction$$InjectAdapter.get(ViewInteraction$$InjectAdapter.java:20)
    at dagger.ObjectGraph$DaggerObjectGraph.get(ObjectGraph.java:251)
    at com.google.android.apps.common.testing.ui.espresso.Espresso.onView(Espresso.java:58)
    at com.example.espresso.TestExample.testCommand(TestExample.java:28)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
    at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
    at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
    at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
    at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1590)
TestExample.java

public class TestExample extends ActivityInstrumentationTestCase2<ClickActivity>{

    public TestExample() {
        super(ClickActivity.class);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void setUp() throws Exception {
        // TODO Auto-generated method stub
        super.setUp();
        getActivity();
    }

    public void testCommand(){
        String text = "I Love Espresso!!";
        Espresso.onView(ViewMatchers.withId(R.id.txt)).perform(ViewActions.typeText(text));
        Espresso.onView(ViewMatchers.withId(R.id.button1)).perform(ViewActions.click());
        Espresso.onView(ViewMatchers.withId(R.id.txt)).check(ViewAssertions.matches(ViewMatchers.withText(text)));
    }

}
公共类测试示例扩展ActivityInstrumentationTestCase2{
公共测试示例(){
super(ClickActivity.class);
//TODO自动生成的构造函数存根
}
@凌驾
受保护的void setUp()引发异常{
//TODO自动生成的方法存根
super.setUp();
getActivity();
}
公共void testCommand(){
String text=“我喜欢浓缩咖啡!!”;
Espresso.onView(ViewMatchers.withId(R.id.txt)).perform(ViewActions.typeText(text));
Espresso.onView(ViewMatchers.withId(R.id.button1))。执行(ViewActions.click());
Espresso.onView(ViewMatchers.withId(R.id.txt)).check(viewsertions.matches(ViewMatchers.withText(text));
}
}
Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.espresso"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="17" />

    <instrumentation 
        android:targetPackage="com.example.espresso" 
        android:name="android.test.InstrumentationTestRunner" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
    <uses-library android:name="android.test.runner" />
    <activity android:name = "ClickActivity"></activity>
    </application>


</manifest>


您的清单中缺少GoogleInstrumentationTestRunner条目。之后,确保将测试配置为通过GITR运行。请参阅此处的说明:

您的instrumentation值->android:名称应为“com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner”,而不是“android.test.InstrumentationTestRunner”

然后确保在配置junit测试时选择它:


如果您需要更多指导,我在我的博客上发布了一个快速设置图坦卡蒙。

为了澄清上的说明,请参考@ValeraZakharov

使用Android Studio和gradle时,不需要更新AndroidManifest.xml,而是需要编辑文件
build.gradle
。将此条目添加到部分
android
-
defaultConfig

android {
    defaultConfig {
        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
    }
}
另外:右键单击“添加为库”已从Android studio中删除,并替换为:

android {
    sourceSets {
        // Espresso instrumentation tests
        androidTest.setRoot('src/instrumentTest')
    }
}
在我的项目中,
android
的完整部分如下所示:

android {
    compileSdkVersion 17
    buildToolsVersion "19.0.1"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 16
        versionName getCommitNumber()
        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
    }

    sourceSets {
        // Espresso instrumentation tests
        androidTest.setRoot('src/instrumentTest')
    }

    packagingOptions {
        // Multiple LICENSE.txt in hamcrest packages.
        exclude 'LICENSE.txt'
    }

}

正如其他人提到的,您应该使用GoogleInstrumentationTestRunner。 如果使用ant构建,则需要向测试项目的build.xml中的“project”指令添加一个元素,如下所示

in build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="MainActivityTest" default="help">
    ...

   <property name="test.runner" value="com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner" />
</project>

...

如果您有一个应用了单元测试的依赖库,则该库的仪器设置也应如下所示

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

我正在使用IntelliJ 13,问题是自从我开始使用Gradle Android构建工具
0.9.+
以来,IntelliJ就不再“了解”Google InstrumentationTestRunner了。。。有什么想法吗?