小编Ken*_*Ken的帖子

尝试使用react-native run-android命令在我的Android手机上运行React-Native会导致以下错误.我有必要的SDK,包等.我在谷歌找不到任何解决这个错误的方法.

Installing APK 'app-debug.apk' on 'HUAWEI GRA-L09 - 5.0.1' for app:debug
Unable to install D:\...\app-debug.apk
com.android.ddmlib.InstallException: Failed to install all
        at com.android.ddmlib.SplitApkInstaller.install(SplitApkInstaller.java:89)
        at com.android.ddmlib.Device.installPackages(Device.java:904)
        at com.android.builder.testing.ConnectedDevice.installPackages(ConnectedDevice.java:137)
        at com.android.build.gradle.internal.tasks.InstallVariantTask.install(InstallVariantTask.java:134)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:228)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:221)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:210)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:621)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:604)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:66)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
        at …

要比较两个字符串并将字符串添加到列表中,如果它们相等,我使用内置的比较函数创建了这个函数:

fun compareString(string, list) = 
    if compare(string, "hello") = EQUAL then string::list;

但是,这会产生错误.我想我的语法一定是错的,我是否正确使用了比较功能？

根据文档,比较函数的工作原理如下:

compare(s,t)使用Char.compare字符的顺序对两个字符串进行字典比较.如果s小于,等于或大于t,则返回LESS,, EQUAL或GREATER.

下面是包含"IntRelation"方法的(不完整的)代码,我想测试它是否抛出异常.

public abstract class IntRelation {

    public IntRelation(final int n) throws IllegalArgumentException {
        if (n < 0) {
            throw new IllegalArgumentException ("Parameter in precondition violated.");
        }
    }
}

下面是包含"IntRelation"方法的测试用例的(不完整)代码.

public abstract class IntRelationTestCases {

    protected IntRelation instance;

    @Test
    public void testException0() {
        Class expected = IllegalArgumentException.class;
        instance.IntRelation(-1);
    }
}

我遇到的问题是,在第二段代码中,NetBeans/JUnit说它找不到方法"IntRelation".我究竟做错了什么？