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今天写代码的时候，搜索一个文件，我需要判断搜索的文件是否存在，Python中我会，但是Java的uiautomator不太熟悉，找了下网上的教程，怎么都是把API罗列出来的，知道waitForExists()，但是我不知道怎么用啊，无奈只好自己去看源码：
/*** Waits a specified length of time for a view to become visible.** This method waits until the view becomes visible on the display, or* until the timeout has elapsed. You can use this method in situations where* the content that you want to select is not immediately displayed.** @param timeout the amount of time to wait (in milliseconds)* @return true if the view is displayed, else false if timeout elapsed while waiting* @since API Level 16*/
public boolean waitForExists(long timeout) {Tracer.trace(timeout);if(findAccessibilityNodeInfo(timeout) != null) {return true;}return false;
}找到之后，还是没例子，机制如我
果然能够跳转，跳转过去，就发现了源码上有例子：
public void legacySetText(String text) throws UiObjectNotFoundException {Tracer.trace();// long click left + centerAccessibilityNodeInfo node = findAccessibilityNodeInfo(mConfig.getWaitForSelectorTimeout());if (node == null) {throw new UiObjectNotFoundException(getSelector().toString());}Rect rect = getVisibleBounds(node);getInteractionController().longTapNoSync(rect.left + 20, rect.centerY());// check if the edit menu is openUiObject selectAll = new UiObject(new UiSelector().descriptionContains("Select all"));if (selectAll.waitForExists(50)) {selectAll.click();}// wait for the selectionSystemClock.sleep(250);// delete itgetInteractionController().sendKey(KeyEvent.KEYCODE_DEL, 0);// Send new textgetInteractionController().sendText(text);
}
然后其中的这句就是我想要的：
UiObject selectAll = new UiObject(new UiSelector().descriptionContains("Select all"));
if (selectAll.waitForExists(50)) {selectAll.click();
}然后自己就可以写一个啦：
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