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!
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:
- 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;
- }
- }