TouchLongClick

package io.appium.android.bootstrap.handler;

import android.os.SystemClock;
import com.android.uiautomator.common.ReflectionUtils;
import com.android.uiautomator.core.UiObjectNotFoundException;
import io.appium.android.bootstrap.Logger;

import java.lang.reflect.Method;

/**
 * This handler is used to long click elements in the Android UI.
 * 
 */
public class TouchLongClick extends TouchEvent {
  /*
   * UiAutomator has a broken longClick, so we'll try to implement it using the
   * touchDown / touchUp events.
   */
  private boolean correctLongClick(final int x, final int y, final int duration) {
    try {
      /*
       * bridge.getClass() returns ShellUiAutomatorBridge on API 18/19 so use
       * the super class.
       */

      final ReflectionUtils utils = new ReflectionUtils();
      final Method touchDown = utils.getControllerMethod("touchDown", int.class,
          int.class);
      final Method touchUp = utils.getControllerMethod("touchUp", int.class, int.class);

      if ((Boolean) touchDown.invoke(utils.getController(), x, y)) {
        SystemClock.sleep(duration);
        if ((Boolean) touchUp.invoke(utils.getController(), x, y)) {
          return true;
        }
      }
      return false;

    } catch (final Exception e) {
      Logger.debug("Problem invoking correct long click: " + e);
      return false;
    }
  }

  @Override
  protected boolean executeTouchEvent() throws UiObjectNotFoundException {
    final Object paramDuration = params.get("duration");
    int duration = 2000; // two seconds
    if (paramDuration != null) {
      duration = Integer.parseInt(paramDuration.toString());
    }

    printEventDebugLine("TouchLongClick", duration);
    if (correctLongClick(clickX, clickY, duration)) {
      return true;
    }
    // if correctLongClick failed and we have an element
    // then uiautomator's longClick is used as a fallback.
    if (isElement) {
      Logger.debug("Falling back to broken longClick");

      return el.longClick();
    }
    return false;
  }
}

TouchLongClick类继承于TouchEvent。而TouchEvent继承于CommandHandler.调用TouchEvent的execute的方法中，调用了executeTouchEvent方法，所以我们来看上面的executeTouchEvent就好了，运行长点击事件。在uiautomator里有UiObject.longClick()方法，可是写过case的人知道，有时候这种方法达不到我们的需求，可是我们是自己了反射调用TouchDown和TouchUp两个个方法，而在appium里帮你攻克了。它自己就帮你做到了这一点，假设你传入到是控件对象，那无可厚非，还是调用UiObject.longClick方法，假设你想依据坐标，时间在点击的话，那么就调用currectLongClick这个appium给你封装好的方法。

final ReflectionUtils utils = new ReflectionUtils();
      final Method touchDown = utils.getControllerMethod("touchDown", int.class,
          int.class);
      final Method touchUp = utils.getControllerMethod("touchUp", int.class, int.class);

通过反射得到uiautomator里的没有公开的类。从而我们想要的方法touchDown和touchUp.

public ReflectionUtils() throws IllegalArgumentException,
      IllegalAccessException, SecurityException, NoSuchFieldException {
    final UiDevice device = UiDevice.getInstance();
    final Object bridge = enableField(device.getClass(), "mUiAutomationBridge")
        .get(device);
    if (API_18) {
      controller = enableField(bridge.getClass().getSuperclass(),
          "mInteractionController").get(bridge);
    } else {
      controller = enableField(bridge.getClass(), "mInteractionController")
          .get(bridge);
    }
  }

由于uiautomator api的修改，在api18以上的版本号中，mInteractionController是存在于UiAutomationBridge的父类中的变量，而在18下面的版本号中它是存在于本类中的。所以反射时会有一点点小小点差异，但总的来说都是要获得InteractionController这个类，由于这个类里面存在有我们要但touch类但方法。最后我们就能轻松调用鼠标的TouchUp和TouchDown他们啦。

然后再加上时间，长按就实现啦。

TouchUp

package io.appium.android.bootstrap.handler;

import com.android.uiautomator.common.ReflectionUtils;
import com.android.uiautomator.core.UiObjectNotFoundException;
import io.appium.android.bootstrap.Logger;

import java.lang.reflect.Method;

/**
 * This handler is used to perform a touchDown event on an element in the
 * Android UI.
 * 
 */
public class TouchDown extends TouchEvent {

  @Override
  protected boolean executeTouchEvent() throws UiObjectNotFoundException {
    printEventDebugLine("TouchDown");
    try {
      final ReflectionUtils utils = new ReflectionUtils();
      final Method touchDown = utils.getControllerMethod("touchDown", int.class,
          int.class);
      return (Boolean) touchDown.invoke(utils.getController(), clickX, clickY);
    } catch (final Exception e) {
      Logger.debug("Problem invoking touchDown: " + e);
      return false;
    }
  }
}

有了上面的分析，对TouchUp和TouchDown还有TouchMove的分析就不用再多说了，都是反射的原理

TouchDown

类同

TouchMove

类同