（上篇文章写完才发现，说好的按顺序但是回头一看完全不是按顺序的）明明WaitForIdle才是第一个。哎，老了，后脑勺不行了。 # 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); } } ~~~ 上面的代码处理过程很简单，首先都是获取命令里面的参数，然后初始化一个timeout私有变量，如果参数里不含时间，那么就用这个默认的时间。然后调用uiautomator的UiDevice的对象里方法waitForIdle(),该方法就在timeout时间内界面上没有其他操作，处于空闲状态。这个就是封装了一下UiDevice的waitForIdle方法而已没啥可讲的。 # 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(); } ~~~ 实际上调用的是uiautomator中的UiObject.clearTextField()，清楚文本框内的内容。