（上篇文章寫完才發現，說好的按順序但是回頭一看完全不是按順序的）明明WaitForIdle才是第一個。哎，老了，后腦勺不行了。 # WaitForIdle ~~~ package io.appium.android.bootstrap.handler; import com.android.uiautomator.core.UiDevice; import io.appium.android.bootstrap.AndroidCommand; import io.appium.android.bootstrap.AndroidCommandResult; import io.appium.android.bootstrap.CommandHandler; import org.json.JSONException; import java.util.Hashtable; /** * This handler is used to clear elements in the Android UI. * * Based on the element Id, clear that element. * */ public class WaitForIdle 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 { final Hashtable<String, Object> params = command.params(); long timeout = 10; if (params.containsKey("timeout")) { timeout = (Integer) params.get("timeout"); } UiDevice d = UiDevice.getInstance(); d.waitForIdle(timeout); return getSuccessResult(true); } } ~~~ 上面的代碼處理過程很簡單，首先都是獲取命令里面的參數，然后初始化一個timeout私有變量，如果參數里不含時間，那么就用這個默認的時間。然后調用uiautomator的UiDevice的對象里方法waitForIdle(),該方法就在timeout時間內界面上沒有其他操作，處于空閑狀態。這個就是封裝了一下UiDevice的waitForIdle方法而已沒啥可講的。 # Clear ~~~ package io.appium.android.bootstrap.handler; import com.android.uiautomator.core.UiObjectNotFoundException; import io.appium.android.bootstrap.*; import org.json.JSONException; /** * This handler is used to clear elements in the Android UI. * * Based on the element Id, clear that element. * */ public class Clear 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()) { try { final AndroidElement el = command.getElement(); el.clearText(); return getSuccessResult(true); } catch (final UiObjectNotFoundException e) { return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT, e.getMessage()); } catch (final Exception e) { // handle NullPointerException return getErrorResult("Unknown error clearing text"); } } return getErrorResult("Unknown error"); } } ~~~ Clear的方法中就看e1.clearText()方法，其他的我在click中都有涉及。 ~~~ private final UiObject el; public void clearText() throws UiObjectNotFoundException { el.clearTextField(); } ~~~ 實際上調用的是uiautomator中的UiObject.clearTextField()，清楚文本框內的內容。