appium在android7.0真机上测试程序时报错command failed shell “ps ‘uiautomator’”的解决方式

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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：

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appium

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