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

（转自http://blog.csdn.net/pjl6523853/article/details/72886048） 亲测有效

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

问题解决。