使用ServiceTestCase运行时,Service.startForeground()会抛出NullPointerException

Question

这是一个已知的令人烦恼的2年前的Android漏洞.

我的问题是除了修改Android源代码并再次编译之外,有没有人知道这个问题的解决方法？

这是我的代码,为了完成:

提升NPE的My Service子类方法:

/** Shows notification of started service */
private void doStartForeground() {

    // Prepare notification
    final NotificationHelper nh = doNotification("Service started");

    // Start foreground
    startForeground(nh.getNotificationId(), nh.getNotification());
}

这是从onCreate()方法覆盖调用的.

和JUnit测试方法:

public void test1() throws InterruptedException {
    assertTrue(context != null);
    final Intent service = new Intent();
    service.setComponent(new ComponentName(CoreService.PACKAGE_NAME,
        CoreService.SERVICE_FULL_NAME));
    IBinder binder = bindService(service);
    assertTrue(binder != null);
}

堆栈跟踪:

java.lang.NullPointerException
at android.app.Service.startForeground(Service.java:631)
at com.blablabla.android.core.CoreService.doStartForeground(CoreService.java:82)
at com.blablabla.android.core.CoreService.onCreate(CoreService.java:149)
at android.test.ServiceTestCase.bindService(ServiceTestCase.java:234)
at com.blablabla.android.core.test.MainTest.test1(MainTest.java:37)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:537)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1551)

服务正常启动,并且在不通过Android的JUnit运行时工作正常.

Answer 1

我终于在我的服务中添加了一个新的静态字段:

/** JUNIT - this is for testing purposes only */
public static boolean isJUnit = false;

并在onCreate()方法中检查它:

// Start the service as foreground (Android should not kill this
// service)
if (!isJUnit) {
    doStartForeground();
}

然后我从JUnit的设置这个标志setUp():

@Override
protected void setUp() throws Exception {
    super.setUp();
    // More setup
    MyServiceClass.isJUnit = true;
}

不是最优雅的解决方案,但让我摆脱封锁.