定制AppiumBootstrap.jar

1. 下载源码，直接用idea打开会报错，要导入依赖包：android.jar、uiautomator.jar
2. 修改源码：
   例如在Find类execute方法中添加找不到element打印日志

    if (!multiple) {
        for (int i = 0; i < selectors.size() && !found; i++) {
          try {
            Logger.debug("Using: " + selectors.get(i).toString());
            result = fetchElement(selectors.get(i), contextId);
            found = result != null;
          } catch (final ElementNotFoundException ignored) {
            //在这添加打印日志
            Logger.debug("FoundException: " + ignored.toString());
          }
        }
      } else {
        List<AndroidElement> foundElements = new ArrayList<AndroidElement>();
        for (final UiSelector sel : selectors) {
        ....
          try {
            Logger.debug("Using: " + sel.toString());
            final List<AndroidElement> elementsFromSelector = fetchElements(
                sel, contextId);
            foundElements.addAll(elementsFromSelector);
          } catch (final UiObjectNotFoundException ignored) {
            //在这添加打印日志
            Logger.debug("FoundException: " + ignored.toString());
          }
        }
        ....
      }

3. 用adb forward tcp:4724 tcp:4724映射端口
4. 利用uiautomatorhelpr编译运行AppiumBootstrap.jar
   此时手机端开始监听4724端口
5. 给手机端发消息测试下是否通了

    public class PCClient {

        public static void main(String[] args) throws IOException {
            System.out.println("任意字符, 回车键发送Toast");
            Scanner scanner = new Scanner(System.in);
            while (true) {
                String msg = scanner.next();
                sendMsg(msg);
            }
        }

        public static void sendMsg(String msg) throws IOException {
            Socket socket = new Socket("127.0.0.1", 4724);
            DataInputStream dis = new DataInputStream(socket.getInputStream());
            DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
            dos.writeUTF(msg);
            socket.close();
        }
    }

6. 将编译好的AppiumBootstrap.jar（在bin目录下）复制到appium工程的
7. node_modules/appium-android-bootstrap/bootstrap/bin目录下。

输出结果：

这时候就有我们定制的输出语句了

主意：
如果手机端uiautomator一直运行会导致下次无法启动，可以使用adb shell ps | find "uiautomator"
命令查找该进程，并用adb命令杀死adb shell kill [pid]

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