用了 AppiumDriver 后，WebDriverWait 中无法使用 AppiumDriver 特有的方法，比如 findElementsByAndroidUIAutomator 等。这是由于
WebDriverWait 继承与 FluentWait，而 WebDriver 接口是没有定义 findElementsByAndroidUIAutomator 的，所以如果想用类似 WebDriverWait 的功能，就必须做些封装。

package com.merlini.app.common;

import io.appium.java_client.AppiumDriver;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.NotFoundException;
import org.openqa.selenium.support.ui.Clock;
import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Sleeper;
import org.openqa.selenium.support.ui.SystemClock;
import org.openqa.selenium.support.ui.WebDriverWait;

import com.merlini.common.Config;


public class AppiumDriverWait extends FluentWait<AppiumDriver>{
    //默认轮询时间(毫秒)
    public final static long DEFAULT_POLLINGEVERY_TIMEMILLS = Integer.parseInt(Config.getConfBykey("wait.sleepInMillis"));
    public final static long DEFAULT_TIMEOUT_INSECONDS = Integer.parseInt(Config.getConfBykey("wait.TimeOutInSeconds"));
    /**
       * Wait will ignore instances of NotFoundException that are encountered (thrown) by default in
       * the 'until' condition, and immediately propagate all others.  You can add more to the ignore
       * list by calling ignoring(exceptions to add).
       *
       * @param driver The AppiumDriver instance to pass to the expected conditions
       * @see WebDriverWait#ignoring(java.lang.Class)
       */
    public AppiumDriverWait(AppiumDriver driver) {
        this(driver, new SystemClock(), Sleeper.SYSTEM_SLEEPER, DEFAULT_TIMEOUT_INSECONDS, DEFAULT_POLLINGEVERY_TIMEMILLS);
    }
    /**
       * Wait will ignore instances of NotFoundException that are encountered (thrown) by default in
       * the 'until' condition, and immediately propagate all others.  You can add more to the ignore
       * list by calling ignoring(exceptions to add).
       *
       * @param driver The AppiumDriver instance to pass to the expected conditions
       * @param timeOutInSeconds The timeout in seconds when an expectation is called
       * @see WebDriverWait#ignoring(java.lang.Class)
       */
    public AppiumDriverWait(AppiumDriver driver, long timeOutInSeconds) {
        this(driver, new SystemClock(), Sleeper.SYSTEM_SLEEPER, timeOutInSeconds, DEFAULT_POLLINGEVERY_TIMEMILLS);
    }
    /**
       * Wait will ignore instances of NotFoundException that are encountered (thrown) by default in
       * the 'until' condition, and immediately propagate all others.  You can add more to the ignore
       * list by calling ignoring(exceptions to add).
       *
       * @param driver The WebDriver instance to pass to the expected conditions
       * @param timeOutInSeconds The timeout in seconds when an expectation is called
       * @param sleepInMillis The duration in milliseconds to sleep between polls.
       * @see WebDriverWait#ignoring(java.lang.Class)
       */
    public AppiumDriverWait(AppiumDriver driver, long timeOutInSeconds, long sleepInMillis) {
        this(driver, new SystemClock(), Sleeper.SYSTEM_SLEEPER, timeOutInSeconds, sleepInMillis);
      }
    protected AppiumDriverWait(AppiumDriver driver, Clock clock, Sleeper sleeper, long timeOutInSeconds,
          long sleepTimeOut) {
        super(driver, clock, sleeper);
        withTimeout(timeOutInSeconds, TimeUnit.SECONDS);
        pollingEvery(sleepTimeOut, TimeUnit.MILLISECONDS);
        ignoring(NotFoundException.class);
    }


}

package com.merlini.app.common;

import io.appium.java_client.AppiumDriver;

import com.google.common.base.Function;

public interface AppiumExpectedCondition<T> extends Function<AppiumDriver,T>{

}

这样就可以 AppiumDriverWait 代替 WebDriverWait
如：

/**
     * 根据控件description抓取批量元素
     * @param elementType
     * @param desc
     * @return
     */
    public List<WebElement> findElementsByDescription(final String elementType,final String desc){
        AppiumDriverWait wait=new AppiumDriverWait(driver);
        List<WebElement> ele= wait.until( new AppiumExpectedCondition<List<WebElement>>(){
            public List<WebElement> apply(AppiumDriver driver){
                return driver.findElementsByAndroidUIAutomator("new UiSelector().className(\"android.widget."+elementType+"\").description(\""+desc+"\")");
            }
        });
        return ele;//driver.findElementsByAndroidUIAutomator("new UiSelector().className(\"android.widget."+elementType+"\").description(\""+desc+"\")"); 
    }