【Android】使用Appium+python控制真机，碰到的问题以及处理（持续更新）

问题：
selenium.common.exceptions.WebDriverException: Message: A new session could not be created. 
(Original error: Command failed: C:\Windows\system32\cmd.exe /s /c "D:\android-sdk-windows\platform-tools\adb.exe -s 91f7e690 install 
"C:\Program Files (x86)\Appium\node_modules\appium\build\settings_apk\settings_apk-debug.apk""
Failed to install C:\Program Files (x86)\Appium\node_modules\appium\build\settings_apk\settings_apk-debug.apk: 
Failure [INSTALL_FAILED_ALREADY_EXISTS: Attempt to re-install io.appium.settings without first uninstalling.]

解决：
C:\Program Files (x86)\Appium\node_modules\appium\lib\devices\android

找到Android.js 文件，注释下述的三行代码即可：（颜色为红色的代码行）

报错：
command failed shell "ps 'uiautomator'"

解决：

1、找到appium的安装目录下的adb.js文件，目录为：

Appium\node_modules\appium\node_modules\appium-adb\lib 

2、打开adb.js，找到如下代码：

ADB.prototype.shell = function (cmd, cb) {
  if (cmd.indexOf('"') === -1) {
    cmd = '"' + cmd + '"';
  }
  var execCmd = 'shell ' + cmd;
  this.exec(execCmd, cb);
};

在这段代码下面加入这段代码：

ADB.prototype.shell_grep = function (cmd, grep, cb) {
  if (cmd.indexOf('"') === -1) {
    cmd = '"' + cmd + '"';
  }
  var execCmd = 'shell ' + cmd + '| grep ' + grep;
  this.exec(execCmd, cb);
};

再找到如下代码进行注释掉：
ADB.prototype.getPIDsByName = function (name, cb) {
  logger.debug("Getting all processes with '" + name + "'");
  this.shell("ps '" + name + "'", function (err, stdout) {
    if (err) return cb(err);
    stdout = stdout.trim();
    var procs = [];
    var outlines = stdout.split("\n");
    outlines.shift();
    _.each(outlines, function (outline) {
      if (outline.indexOf(name) !== -1) {
        procs.push(outline);
      }
    });
    if (procs.length < 1) {
      logger.debug("No matching processes found");
      return cb(null, []);
    }
    var pids = [];
    _.each(procs, function (proc) {
      var match = /[^\t ]+[\t ]+([0-9]+)/.exec(proc);
      if (match) {
        pids.push(parseInt(match[1], 10));
      }
    });
    if (pids.length !== procs.length) {
      var msg = "Could not extract PIDs from ps output. PIDS: " +
                JSON.stringify(pids) + ", Procs: " + JSON.stringify(procs);
      return cb(new Error(msg));
    }
    cb(null, pids);
  });
};

把这段代码注释掉，用如下代码代替：
ADB.prototype.getPIDsByName = function (name, cb) {
  logger.debug("Getting all processes with '" + name + "'");
  this.shell_grep("ps", name, function (err, stdout) {
    if (err) {
      logger.debug("No matching processes found");
      return cb(null, []);
    }
    var pids = [];
    _.each(procs, function (proc) {
    var match = /[^\t ]+[\t ]+([0-9]+)/.exec(proc);
    if (match) {
    pids.push(parseInt(match[1], 10));
    }
    });
    if (pids.length !== procs.length) {
      var msg = "Could not extract PIDs from ps output. PIDS: " +
      JSON.stringify(pids) + ", Procs: " + JSON.stringify(procs);
      return cb(new Error(msg));
    }
    cb(null, pids);
  });
};

3 ：重启软件