设备要求
已root的Android手机。
背景
这个方法是意外发现的,最初同事有一台测试机插上usb能充电但不能识别,他让我帮他看看怎么回事,于是我就按照常规套路,开发者模式、usb调试、MTP什么的一通操作,插上电脑一看,还是没有反应,于是只有尴尬的给他说,估计是usb接口坏了,
本来以为这就完事了,事实证明,出来混都是要还的,过了几天,是因为笔记本电脑的usb接口不够用,想通过无线网络连接手机进行调试,于是百度一下,找了篇教程【使用WIFI连接ADB、再也不用USB啦~~~~】就开始操作,成功连接,想着从此摆脱接口限制,心里美滋滋,然后因为当时测试一个东西需要好几台手机,在附近搜刮了一波,没想到那个破手机又到我手上来了,想着我也就看看日志不干其他的事,于是就连接WiFi,准备照着前面的教程再来一遍,然后就开启了一段怀疑人生之旅,
操作过程
先来一个正常的手机
电脑和手机在同一个局域网:
直接adb连接,会被拒绝
打开终端模拟器进入shell,设置端口
adb通过ip连接手机,查看设备,可以看到已经连接上了
再看一个坑爹手机
首先,还是电脑和手机在同一局域网
同样,直接adb连接,会被拒绝
进入终端模拟器设置端口,也没有什么异常
接下来,adb通过ip连接手机,杯具了,还是连接不上
开始还以为是我那里弄错了,又重复弄了几遍,还是不行,开始怀疑人生了,
然后我就怀疑是adbd有问题,于是用ps查看进程,发现根本没有adbd的进程,
于是手动启动adbd的进程试下
再次用adb通过ip连接手机,已经能连接上了
意外收获
adb连接上后突然想到,因为adbd进程没有启动导致通过WiFi连接不上,那么usb连接不上是不是也是这个原因呢,于是马上插上数据线验证一下,发现已经能连接到该设备了
由此想到,手机启动的时候,由于某些原因,adbd启动失败,导致usb连接不上手机,
解决方法
既然知道了连接不上手机是adbd没有启动导致的,那么每次手机重启动后手动把adbd启动即可,
但是想着在手机上去输命令行有点麻烦,于是动手写了个app,每次启动后点一下这个app就好了
,
代码如下,一条命令搞定,
package com.example.startadbd; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ShellUtils.execCommand("/sbin/adbd &",true); } }
其中用到的执行shell命令的工具类ShellUtils是以前在网上找的,具体网址忘了收藏了,代码直接贴下面吧,
public class ShellUtils { public static final String COMMAND_SU = "su"; public static final String COMMAND_SH = "sh"; public static final String COMMAND_EXIT = "exit\n"; public static final String COMMAND_LINE_END = "\n"; private ShellUtils() { throw new AssertionError(); } /** * 查看是否有了root权限 * * @return */ public static boolean checkRootPermission() { return execCommand("echo root", true, false).result == 0; } /** * 执行shell命令,默认返回结果 * * @param command command * @param isRoot 运行是否需要root权限 * @return * @see ShellUtils#execCommand(String[], boolean, boolean) */ public static CommandResult execCommand(String command, boolean isRoot) { return execCommand(new String[]{command}, isRoot, true); } /** * 执行shell命令,默认返回结果 * * @param commands command list * @param isRoot 运行是否需要root权限 * @return * @see ShellUtils#execCommand(String[], boolean, boolean) */ public static CommandResult execCommand(List<String> commands, boolean isRoot) { return execCommand( commands == null ? null : commands.toArray(new String[]{}), isRoot, true); } /** * 执行shell命令,默认返回结果 * * @param commands command array * @param isRoot 运行是否需要root权限 * @return * @see ShellUtils#execCommand(String[], boolean, boolean) */ public static CommandResult execCommand(String[] commands, boolean isRoot) { return execCommand(commands, isRoot, true); } /** * execute shell command * * @param command command * @param isRoot 运行是否需要root权限 * @param isNeedResultMsg whether need result msg * @return * @see ShellUtils#execCommand(String[], boolean, boolean) */ public static CommandResult execCommand(String command, boolean isRoot, boolean isNeedResultMsg) { return execCommand(new String[]{command}, isRoot, isNeedResultMsg); } /** * execute shell commands * * @param commands command list * @param isRoot 运行是否需要root权限 * @param isNeedResultMsg 是否需要返回运行结果 * @return * @see ShellUtils#execCommand(String[], boolean, boolean) */ public static CommandResult execCommand(List<String> commands, boolean isRoot, boolean isNeedResultMsg) { return execCommand( commands == null ? null : commands.toArray(new String[]{}), isRoot, isNeedResultMsg); } /** * execute shell commands * * @param commands command array * @param isRoot 运行是否需要root权限 * @param isNeedResultMsg 是否需要返回运行结果 * @return <ul> * <li>if isNeedResultMsg is false, {@link CommandResult#successMsg} * is null and {@link CommandResult#errorMsg} is null.</li> * <li>if {@link CommandResult#result} is -1, there maybe some * excepiton.</li> * </ul> */ public static CommandResult execCommand(String[] commands, boolean isRoot, boolean isNeedResultMsg) { int result = -1; if (commands == null || commands.length == 0) { return new CommandResult(result, null, null); } Process process = null; BufferedReader successResult = null; BufferedReader errorResult = null; StringBuilder successMsg = null; StringBuilder errorMsg = null; DataOutputStream os = null; try { process = Runtime.getRuntime().exec( isRoot ? COMMAND_SU : COMMAND_SH); os = new DataOutputStream(process.getOutputStream()); for (String command : commands) { if (command == null) { continue; } // donnot use os.writeBytes(commmand), avoid chinese charset // error os.write(command.getBytes()); os.writeBytes(COMMAND_LINE_END); os.flush(); } os.writeBytes(COMMAND_EXIT); os.flush(); result = process.waitFor(); // get command result if (isNeedResultMsg) { successMsg = new StringBuilder(); errorMsg = new StringBuilder(); successResult = new BufferedReader(new InputStreamReader( process.getInputStream())); errorResult = new BufferedReader(new InputStreamReader( process.getErrorStream())); String s; while ((s = successResult.readLine()) != null) { successMsg.append(s); } while ((s = errorResult.readLine()) != null) { errorMsg.append(s); } } } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { try { if (os != null) { os.close(); } if (successResult != null) { successResult.close(); } if (errorResult != null) { errorResult.close(); } } catch (IOException e) { e.printStackTrace(); } if (process != null) { process.destroy(); } } return new CommandResult(result, successMsg == null ? null : successMsg.toString(), errorMsg == null ? null : errorMsg.toString()); } /** * 运行结果 * <ul> * <li>{@link CommandResult#result} means result of command, 0 means normal, * else means error, same to excute in linux shell</li> * <li>{@link CommandResult#successMsg} means success message of command * result</li> * <li>{@link CommandResult#errorMsg} means error message of command result</li> * </ul> * * @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> * 2013-5-16 */ public static class CommandResult { /** * 运行结果 **/ public int result; /** * 运行成功结果 **/ public String successMsg; /** * 运行失败结果 **/ public String errorMsg; public CommandResult(int result) { this.result = result; } public CommandResult(int result, String successMsg, String errorMsg) { this.result = result; this.successMsg = successMsg; this.errorMsg = errorMsg; } } }
再附一个编译好的安装包,不想自己编译的可以直接【下载】安装,