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标题: appium三种等待元素的方法 [打印本页]
作者: 测试积点老人    时间: 2019-1-7 16:35
标题: appium三种等待元素的方法
学过selenium的都知道，一般等待元素加载有三种办法:
（1）sleep                  强制等待。示例：Thread.sleep（60000）
（2）implicitlyWait   隐式等待。全局等待30s不管元素是否已经加载

示例：driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
（3）WebDriverWait     显示等待，这个需要增加一定等待时间，显示等待时间可以通过WebDriverWait 和util来决定,比如这个timeOut是60，如果该元素60s以内出现就不在等待
  1. WebDriverWait wait = new WebDriverWait(driver, 60);
  2.     WebElement e= wait.until(new  ExpectedCondition<WebElement>() {
  3.             @Override
  4.             public WebElement apply(WebDriver d) {
  5.                 return d.findElement(By.id("q"));
  6.             }
  7.         })
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以上三种方法中，只用WebDriverWait是selenium所特有，在java-client中也找不到相应的，如果想使用这种方法怎么办？

改造轮子，首先添加AndroidDriverWait.java, 其实是将WebDriverWait的类型改成AndroidDriverWait

具体代码如下：

  1. import org.openqa.selenium.NotFoundException;
  2. import org.openqa.selenium.TimeoutException;
  3. import org.openqa.selenium.WebDriver;
  4. import org.openqa.selenium.WebDriverException;
  5. import org.openqa.selenium.remote.RemoteWebDriver;
  6. import org.openqa.selenium.support.ui.Clock;
  7. import org.openqa.selenium.support.ui.FluentWait;
  8. import org.openqa.selenium.support.ui.Sleeper;
  9. import org.openqa.selenium.support.ui.SystemClock;

  11. import io.appium.java_client.android.AndroidDriver;

  13. import java.util.concurrent.TimeUnit;

  15. /**
  16.   * A specialization of {[url=home.php?mod=space&uid=26824]@link[/url] FluentWait} that uses WebDriver instances.
  17.   */
  18. public class AndroidDriverWait extends FluentWait<AndroidDriver> {
  19.    public final static long DEFAULT_SLEEP_TIMEOUT = 500;
  20.    private final WebDriver driver;

  22.    /**
  23.     * Wait will ignore instances of NotFoundException that are encountered (thrown) by default in
  24.     * the 'until' condition, and immediately propagate all others.  You can add more to the ignore
  25.     * list by calling ignoring(exceptions to add).
  26.     *
  27.     * @param driver The WebDriver instance to pass to the expected conditions
  28.     * @param timeOutInSeconds The timeout in seconds when an expectation is called
  29.     * @see AndroidDriverWait#ignoring(java.lang.Class)
  30.     */
  31.    public AndroidDriverWait(AndroidDriver driver, long timeOutInSeconds) {
  32.      this(driver, new SystemClock(), Sleeper.SYSTEM_SLEEPER, timeOutInSeconds, DEFAULT_SLEEP_TIMEOUT);
  33.    }

  35.    /**
  36.     * Wait will ignore instances of NotFoundException that are encountered (thrown) by default in
  37.     * the 'until' condition, and immediately propagate all others.  You can add more to the ignore
  38.     * list by calling ignoring(exceptions to add).
  39.     *
  40.     * @param driver The WebDriver instance to pass to the expected conditions
  41.     * @param timeOutInSeconds The timeout in seconds when an expectation is called
  42.     * @param sleepInMillis The duration in milliseconds to sleep between polls.
  43.     * @see AndroidDriverWait#ignoring(java.lang.Class)
  44.     */
  45.    public AndroidDriverWait(AndroidDriver driver, long timeOutInSeconds, long sleepInMillis) {
  46.      this(driver, new SystemClock(), Sleeper.SYSTEM_SLEEPER, timeOutInSeconds, sleepInMillis);
  47.    }

  49.    /**
  50.     * @param driver The WebDriver instance to pass to the expected conditions
  51.     * @param clock The clock to use when measuring the timeout
  52.     * @param sleeper Object used to make the current thread go to sleep.
  53.     * @param timeOutInSeconds The timeout in seconds when an expectation is
  54.     * @param sleepTimeOut The timeout used whilst sleeping. Defaults to 500ms called.
  55.     */
  56.    public AndroidDriverWait(AndroidDriver driver, Clock clock, Sleeper sleeper, long timeOutInSeconds,
  57.        long sleepTimeOut) {
  58.      super(driver, clock, sleeper);
  59.      withTimeout(timeOutInSeconds, TimeUnit.SECONDS);
  60.      pollingEvery(sleepTimeOut, TimeUnit.MILLISECONDS);
  61.      ignoring(NotFoundException.class);
  62.      this.driver = driver;
  63.    }

  65.    @Override
  66.    protected RuntimeException timeoutException(String message, Throwable lastException) {
  67.      TimeoutException ex = new TimeoutException(message, lastException);
  68.      ex.addInfo(WebDriverException.DRIVER_INFO, driver.getClass().getName());
  69.      if (driver instanceof RemoteWebDriver) {
  70.        RemoteWebDriver remote = (RemoteWebDriver) driver;
  71.        if (remote.getSessionId() != null) {
  72.          ex.addInfo(WebDriverException.SESSION_ID, remote.getSessionId().toString());
  73.        }
  74.        if (remote.getCapabilities() != null) {
  75.          ex.addInfo("Capabilities", remote.getCapabilities().toString());
  76.        }
  77.      }
  78.      throw ex;
  79.    }
  80. }
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接着需要修改接口：ExpectedCondition，将其WebDriver的类型替换为AndroidDriver

具体代码：

public interface ExpectedCondition<T> extends Function<AndroidDriver, T> {}

经过修改之后，就可以在appium中直接使用：

  1. //wait for 60s if WebElemnt show up less than 60s , then return , until 60s
  2.         WebElement showClose = new AndroidDriverWait(driver, 60)
  3.                 .until(new ExpectedCondition<WebElement>() {
  4.                     public WebElement apply(AndroidDriver d) {
  5.                         return d.findElement(By
  6.                                 .id("com.zhihu.android:id/showcase_close"));
  7.                     }

  9.                 });
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