在做Android應用時,經常需要執行shell腳本,以快速實現某些功能;
在Android應用程序中執行shell腳本可以省去一大堆繁瑣的代碼,還可以避免不必要的錯誤;
比如:拷貝文件夾時,可以執行shell命令中的 cp 命令達到目的;而在代碼中實現拷貝文件夾時,不僅需要編寫一大堆繁瑣的代碼,還容易陷入遞歸死循環的錯誤中;
比如:獲取文件系統的讀寫權限,只需要執行shell腳本中一句 mount -o rw,remount / 就能輕松搞定;
比如:刪除文件夾下某一個文件、或者某一類文件、或者全部文件,只需要執行shell腳本中的一句 rm -f *(利用*通配符進行匹配) 就能輕松搞定;
再比如:靜默安裝時,只需要執行shell腳本中一句 pm install -r 便可達到目的;
如果這些都用代碼來實現,不僅代碼量增加,還容易造成很多bug,吃力不討好!
package com.example.test; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import android.util.Log; /** * 執行shell腳本工具類 * @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執行結果 * @author Mountain * */ public static class CommandResult { public int result = -1; public String errorMsg; public String successMsg; } /** * 執行命令—單條 * @param command * @param isRoot * @return */ public static CommandResult execCommand(String command, boolean isRoot) { String[] commands = {command}; return execCommand(commands, isRoot); } /** * 執行命令-多條 * @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(); //獲取錯誤信息 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應用中執行shell腳本來達到目的,可以省去一大堆代碼,避免很多易犯的錯誤,簡潔高效,何樂而不為呢?!
下面給出一個在Android應用中執行shell腳本的工具類的示例,供大家參考: