小编mac*_*229的帖子

我想在CardView上做透明的背景.我知道backgroundColor,但我的布局上有图像.

你知道怎么做吗？或者作为cardview的东西,但我会设置一个透明的背景？

问候

我正在使用 Jetpack Compose 创建一个布局，并且有一列。我想要此列中的中心项目：

 Column(modifier = ExpandedWidth) {
        Text(text = item.title)
        Text(text = item.description)
 }

我希望使用OkHttp进行Retrofit,当没有Internet时使用缓存.

我准备OkHttpClient是这样的:

    RestAdapter.Builder builder= new RestAdapter.Builder()
       .setRequestInterceptor(new RequestInterceptor() {
            @Override
            public void intercept(RequestFacade request) {
                request.addHeader("Accept", "application/json;versions=1");
                if (MyApplicationUtils.isNetworkAvaliable(context)) {
                    int maxAge = 60; // read from cache for 1 minute
                    request.addHeader("Cache-Control", "public, max-age=" + maxAge);
                } else {
                    int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
                    request.addHeader("Cache-Control", 
                        "public, only-if-cached, max-stale=" + maxStale);
                }
            }
    });

并像这样设置缓存:

   Cache cache = null;
    try {
        cache = new Cache(httpCacheDirectory, 10 * 1024 * 1024);
    } catch …

如何为 Android 单元测试配置 JUnit 5？我试过：

testCompile("org.junit.jupiter:junit-jupiter-api:5.0.0")

但它不起作用，当我运行以前最简单的单元测试时：

@Test
public void addition_isCorrect() throws Exception {
    assertEquals(4, 2 + 2);
}

我得到错误：

Exception in thread "main" java.lang.NoSuchMethodError: org.junit.platform.commons.util.ReflectionUtils.getDefaultClassLoader()Ljava/lang/ClassLoader;
    at org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry.loadTestEngines(ServiceLoaderTestEngineRegistry.java:31)
    at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:42)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:36)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Process finished with exit code 1
Empty test suite.