我尝试使用Appium在真正的Android设备上测试应用程序。AndroidDriver实际上可以连接到应用程序，当我运行代码时，设备上的应用程序将被调用。但当我尝试使用driver.findElement等函数时，没有任何React，等待了很长时间后，出现了Error communicating with the remote browser。
下面是代码：

public class sampleTest {
    private AndroidDriver driver;

    @Before
    public void setUp() throws MalformedURLException {
        DesiredCapabilities desiredCapabilities = new DesiredCapabilities();
        desiredCapabilities.setCapability("deviceName","Zachary");
        desiredCapabilities.setCapability("udid","88Y5T19B1793");
        desiredCapabilities.setCapability("platformName","Android");
        desiredCapabilities.setCapability("platformVersion","3.0.0");
        desiredCapabilities.setCapability("appPackage","com.test.test");
desiredCapabilities.setCapability("appActivity","host.exp.exponent.MainActivity");

        URL remoteUrl = new URL("http://127.0.0.1:4723/wd/hub");
        driver = new AndroidDriver(remoteUrl, desiredCapabilities);
//Here the app on device will be opened.
    }

    @Test
    public void SampleTest() {
//Nothing happens here.
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
        driver.findElement(By.id("SignIn")).click();

    }

    @After
    public void tearDown() {
        driver.quit();
    }
}

等待很长时间后的错误信息：

org.openqa.selenium.remote.UnreachableBrowserException: Error communicating with the remote browser. It may have died.