在做Android应用时,经常需要执行shell脚本,以快速实现某些功能;
在Android应用程序中执行shell脚本可以省去一大堆繁琐的代码,还可以避免不必要的错误;
比如:拷贝文件夹时,可以执行shell命令中的 cp 命令达到目的;而在代码中实现拷贝文件夹时,不仅需要编写一大堆繁琐的代码,还容易陷入递归死循环的错误中;
比如:获取文件系统的读写权限,只需要执行shell脚本中一句 mount -o rw,remount / 就能轻松搞定;
比如:删除文件夹下某一个文件、或者某一类文件、或者全部文件,只需要执行shell脚本中的一句 rm -f *(利用*通配符进行匹配) 就能轻松搞定;
再比如:静默安装时,只需要执行shell脚本中一句 pm install -r 便可达到目的;
如果这些都用代码来实现,不仅代码量增加,还容易造成很多bug,吃力不讨好!
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; } }
如果能在android应用中执行shell脚本来达到目的,可以省去一大堆代码,避免很多易犯的错误,简洁高效,何乐而不为呢?!
下面给出一个在Android应用中执行shell脚本的工具类的示例,供大家参考:
天生我才必有用,千金散去还复来!