Android(安卓)应用程序运行shell命令

Android在应用程序中运行shell命令,可以通过如下工具类实现:

参考:http://blog.csdn.net/sowhat_ah/article/details/43228621


package com.example.test;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import android.util.Log;/** * 执行shell脚本工具类 * @author Mountain * */public class CommandExecution {public static final String TAG = "CommandExecution";public final static String COMMAND_SU       = "su";public final static String COMMAND_SH       = "sh";public final static String COMMAND_EXIT     = "exit\n";public final static String COMMAND_LINE_END = "\n";/** * Command执行结果 * @author Mountain * */public static class CommandResult {public int result = -1;public String errorMsg;public String successMsg;}/** * 执行命令—单条 * @param command * @param isRoot * @return */public static CommandResult execCommand(String command, boolean isRoot) {String[] commands = {command};return execCommand(commands, isRoot);}/** * 执行命令-多条 * @param commands * @param isRoot * @return */public static CommandResult execCommand(String[] commands, boolean isRoot) {CommandResult commandResult = new CommandResult();if (commands == null || commands.length == 0) return commandResult;Process process = null;DataOutputStream os = null;BufferedReader successResult = null;BufferedReader errorResult = null;StringBuilder successMsg = null;StringBuilder errorMsg = null;try {process = Runtime.getRuntime().exec(isRoot ? COMMAND_SU : COMMAND_SH);os = new DataOutputStream(process.getOutputStream());for (String command : commands) {if (command != null) {os.write(command.getBytes());os.writeBytes(COMMAND_LINE_END);os.flush();}}os.writeBytes(COMMAND_EXIT);os.flush();commandResult.result = process.waitFor();//获取错误信息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);commandResult.successMsg = successMsg.toString();commandResult.errorMsg = errorMsg.toString();Log.i(TAG, commandResult.result + " | " + commandResult.successMsg+ " | " + commandResult.errorMsg);} catch (IOException e) {String errmsg = e.getMessage();if (errmsg != null) {Log.e(TAG, errmsg);} else {e.printStackTrace();}} catch (Exception e) {String errmsg = e.getMessage();if (errmsg != null) {Log.e(TAG, errmsg);} else {e.printStackTrace();}} finally {try {if (os != null) os.close();if (successResult != null) successResult.close();if (errorResult != null) errorResult.close();} catch (IOException e) {String errmsg = e.getMessage();if (errmsg != null) {Log.e(TAG, errmsg);} else {e.printStackTrace();}}if (process != null) process.destroy();}return commandResult;}}
在其他service中调用该类时,例如实现对eth0的IP地址配置,直接通过下述命令实现:
CommandExecution.execCommand("ifconfig eth0 192.168.1.2",true);

如果需要执行的命令包含变量,可以使用如下方式:

String ip = “192.168.1.2”String cmd = “ifconfig eth0 ”;cmd = cmd + ip;CommandExecution.execCommand(cmd,true);

在Android5.1中,上述命令并不能直接执行成功,会出现如下错误:

java.io.IOException Error running exec(). Command: [su] Working Directory: null Environment: null

解决思路:参见http://blog.csdn.net/kangear/article/details/51872653

修改frameworks/base/cmds/app_process/app_main.cpp文件

int main(int argc, char* const argv[]) {+/*     if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {         // Older kernels don't understand PR_SET_NO_NEW_PRIVS and return         // EINVAL. Don't die on such kernels.             return 12;         }     }+*/