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# ScrollTo ~~~ package io.appium.android.bootstrap.handler; import com.android.uiautomator.core.UiObject; import com.android.uiautomator.core.UiObjectNotFoundException; import com.android.uiautomator.core.UiScrollable; import com.android.uiautomator.core.UiSelector; import io.appium.android.bootstrap.*; import org.json.JSONException; import java.util.Hashtable; /** * This handler is used to scroll to elements in the Android UI. * * Based on the element Id of the scrollable, scroll to the object with the * text. * */ public class ScrollTo extends CommandHandler { /* * @param command The {@link AndroidCommand} * * @return {@link AndroidCommandResult} * * @throws JSONException * * @see io.appium.android.bootstrap.CommandHandler#execute(io.appium.android. * bootstrap.AndroidCommand) */ @Override public AndroidCommandResult execute(final AndroidCommand command) throws JSONException { if (!command.isElementCommand()) { return getErrorResult("A scrollable view is required for this command."); } try { Boolean result; final Hashtable<String, Object> params = command.params(); final String text = params.get("text").toString(); final String direction = params.get("direction").toString(); final AndroidElement el = command.getElement(); if (!el.getUiObject().isScrollable()) { return getErrorResult("The provided view is not scrollable."); } final UiScrollable view = new UiScrollable(el.getUiObject().getSelector()); if (direction.toLowerCase().contentEquals("horizontal") || view.getClassName().contentEquals( "android.widget.HorizontalScrollView")) { view.setAsHorizontalList(); } view.scrollToBeginning(100); view.setMaxSearchSwipes(100); result = view.scrollTextIntoView(text); view.waitForExists(5000); // make sure we can get to the item UiObject listViewItem = view.getChildByInstance( new UiSelector().text(text), 0); // We need to make sure that the item exists (visible) if (!(result && listViewItem.exists())) { return getErrorResult("Could not scroll element into view: " + text); } return getSuccessResult(result); } catch (final UiObjectNotFoundException e) { return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT, e.getMessage()); } catch (final NullPointerException e) { // el is null return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT, e.getMessage()); } catch (final Exception e) { return new AndroidCommandResult(WDStatus.UNKNOWN_ERROR, e.getMessage()); } } } ~~~ 在uiautomator中有时候需要在一个滚动的list中找到某一个item,而这个item的位置又不定,这个时候我们可以通过UiScrollable的scrollTo来找到特定text的控件。而bootstrap的这个ScrollTo就是封装这样一种需求的。 首先判断控件是否是可以滚动的,然后创建UiScrollable对象,因为默认的滚动方式是垂直方向的,如果需要的是水平方向的的话,还要设置方向为水平。 ~~~ view.setAsHorizontalList(); ~~~ 然后将滚动控件滚到最开始的地方,然后设置最大的搜索范围为100次,因为不可能永远搜索下去。然后开始调用 ~~~ view.scrollTextIntoView(text); ~~~ 开始滚动,最后确认是否滚动到制定目标: ~~~ view.waitForExists(5000); ~~~ 因为有可能有刷新到时间,所以调用方法到时候传入了时间5秒钟。 ~~~ UiObject listViewItem = view.getChildByInstance( new UiSelector().text(text), 0); ~~~ 最后检查结果,获取制定text的对象,判断其是否存在然后返回相应结果给客户端。