在使用uiautomator自动化测试框架过程中，基于对控件实现长按，发现uiautomator自带的方法longClick()很多时候不能实现对控件的长按，因此需要重写该方法。
　　主要代码如下：
public static boolean longClickWithTime(UiObject obj， long time) throws Exception {
Class<?> InteractionControllerClass = null;
Method findAccessibilityNodeInfoMethod = null;
Method getInteractionControllerMethod = null;
Method touchDownMethod = null;
Method touchUpMethod = null;
Field WAIT_FOR_SELECTOR_TIMEOUT = null;
findAccessibilityNodeInfoMethod = UiObject.class.getDeclaredMethod("findAccessibilityNodeInfo"，long.class);
findAccessibilityNodeInfoMethod.setAccessible(true);
WAIT_FOR_SELECTOR_TIMEOUT = UiObject.class.getDeclaredField("WAIT_FOR_SELECTOR_TIMEOUT");
WAIT_FOR_SELECTOR_TIMEOUT.setAccessible(true);
AccessibilityNodeInfo node = (AccessibilityNodeInfo) findAccessibilityNodeInfoMethod.invoke(obj， WAIT_FOR_SELECTOR_TIMEOUT.getLong(obj));
if(node == null) {
throw new UiObjectNotFoundException(obj.getSelector().toString());
}
Rect rect = obj.getVisibleBounds();
getInteractionControllerMethod = UiObject.class.getDeclaredMethod("getInteractionController");
getInteractionControllerMethod.setAccessible(true);
Object interactionController = getInteractionControllerMethod.invoke(obj);
InteractionControllerClass = Class.forName("com.android.uiautomator.core.InteractionController");
touchDownMethod = InteractionControllerClass.getDeclaredMethod("touchDown"， int.class， int.class);
touchDownMethod.setAccessible(true);
touchUpMethod = InteractionControllerClass.getDeclaredMethod("touchUp"， int.class， int.class);
touchUpMethod.setAccessible(true);
if(Boolean.parseBoolean(touchDownMethod.invoke(interactionController， rect.centerX()， rect.centerY()).toString())) {
SystemClock.sleep(time);
if(Boolean.parseBoolean(touchUpMethod.invoke(interactionController， rect.centerX()， rect.centerY()).toString())) {
return true;
}
}
return false;
}
　　调用方式：
　　在使用uiautomator自动化框架时，调用longClickWithTime(Object， time)方法来实现对UiObject控件长按效果。其中Object参数：uiautomator UiObject控件对象，time：表示长按时间，单位为毫秒。
　　例如：对手机主页时钟按钮进行长按5s操作，
　　longClickWithTime(new UiCollection(new UiObject(new UiSelector().text("Clock"))， 5000)；