Android程序中如何执行shell脚本

2021年9月16日 62点热度 0条评论 来源: sowhat_Ah

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;
	}
	
}

    原文作者:sowhat_Ah
    原文地址: https://blog.csdn.net/sowhat_Ah/article/details/43228621
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