运行时报错 Failure [INSTALL_FAILED_ALREADY_EXISTS: Attempt to re-install io.appium.settings without first uninstalling.]
原因分析：appium的uiautomator版本与androidV7.0不适配。
预置条件：手机端已经安装完Appium Settings 和 Unlock两个应用
解决步骤：1.修改源码文件-注释安装appiumSettings和unlock的两行代码
位置：Program Files (x86)Appium ode_modulesappiumlibdevicesandroidandroid.js
//this.pushSettingsApp.bind(this),
//this.pushUnlock.bind(this),
2.修改源码文件如下：
a.打开 Program Files (x86)Appium ode_modulesappium ode_modulesappium-adblibadb.js
b.在adb.js的1035行找到
this.shell("ps '" + name + "'", function (err, stdout) {
if (err) return cb(err); 替换成 this.shell_grep("ps", name, function (err, stdout) { if (err) { logger.debug("No matching processes found"); return cb(null, []); }并增加上面用到的shell_grep函数：
ADB.prototype.shell_grep = function (cmd, grep, cb) {
if (cmd.indexOf('"') === -1) {
cmd = '"' + cmd + '"';
}
var execCmd = 'shell ' + cmd + '| grep ' + grep;
this.exec(execCmd, cb);
};
3.重启appium
ADB.prototype.getPIDsByName = function (name, cb) {
logger.debug("Getting all processes with '" + name + "'");
ADB.prototype.shell_grep = function (cmd, grep, cb) {
if (cmd.indexOf('"') === -1) {
cmd = '"' + cmd + '"';
}
var execCmd = 'shell ' + cmd + '| grep ' + grep;
this.exec(execCmd, cb);
};
this.shell_grep("ps", name, function (err, stdout) {
if (err) {
logger.debug("No matching processes found");
return cb(null, []);
}
//this.shell("ps '" + name + "'", function (err, stdout) {
//if (err) return cb(err);
stdout = stdout.trim();
var procs = [];
var outlines = stdout.split("
");
_.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 = /[^ ]+[ ]+([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);
});
};