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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:

 

posted on 2017-12-29 10:25  蓝少泽  阅读(6912)  评论(0编辑  收藏  举报