Appium中如何等待元素出现

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当要查找元素，而这个元素没有马上出现时，告诉WebDriver查询Dom一定时间。默认值是0,但是设置之后，这个时间将在WebDriver对象实例整个生命周期都起作用。

import io.appium.java_client.AppiumDriver;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.DesiredCapabilities;

public class FirstTest {
   AppiumDriver driver;
   @Before
   public void setUp() throws Exception {
       File classpathRoot = new File(System.getProperty("user.dir"));
       File appDir = new File(classpathRoot, "/App");
       File app = new File(appDir, "test.apk");
       DesiredCapabilities cap = new DesiredCapabilities();
       cap.setCapability("browserName", "");
       cap.setCapability("deviceName", "494f0e69");
       cap.setCapability("platformVersion", "4.2");
       cap.setCapability("platformName", "Android");
       cap.setCapability("automationName", "Selendroid");
       cap.setCapability("app", app.getAbsolutePath());
       cap.setCapability("appPackage", ".android");
       cap.setCapability("appActivity", ".StartupActivity");
       cap.setCapability("appWaitActivity", "");
       driver = new AppiumDriver(new URL("http://127.0.0.1:4723/wd/hub"),
               cap);
       /*Implicitly wait, maximum 60s*/
       driver.manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);
   }

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