Android 开发中使用Linux Shell实例详解

android 开发中使用linux shell实例详解

引言

android系统是基于linux内核运行的，而做为一名linux粉，不在android上面运行一下linux shell怎么行呢？

最近发现了一个很好的android shell工具代码，在这里分享一下。

shell核心代码

import java.io.bufferedreader;
import java.io.dataoutputstream;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.util.list;

/**
 * shellutils
 * <ul>
 * <strong>check root</strong>
 * <li>{@link shellutils#checkrootpermission()}</li>
 * </ul>
 * <ul>
 * <strong>execte command</strong>
 * <li>{@link shellutils#execcommand(string, boolean)}</li>
 * <li>{@link shellutils#execcommand(string, boolean, boolean)}</li>
 * <li>{@link shellutils#execcommand(list, boolean)}</li>
 * <li>{@link shellutils#execcommand(list, boolean, boolean)}</li>
 * <li>{@link shellutils#execcommand(string[], boolean)}</li>
 * <li>{@link shellutils#execcommand(string[], boolean, boolean)}</li>
 * </ul>
 */
public class shellutils {

  public static final string command_su    = "su";
  public static final string command_sh    = "sh";
  public static final string command_exit   = "exit\n";
  public static final string command_line_end = "\n";

  private shellutils() {
    throw new assertionerror();
  }

  /**
   * check whether has root permission
   * 
   * @return
   */
  public static boolean checkrootpermission() {
    return execcommand("echo root", true, false).result == 0;
  }

  /**
   * execute shell command, default return result msg
   * 
   * @param command command
   * @param isroot whether need to run with root
   * @return
   * @see shellutils#execcommand(string[], boolean, boolean)
   */
  public static commandresult execcommand(string command, boolean isroot) {
    return execcommand(new string[] {command}, isroot, true);
  }

  /**
   * execute shell commands, default return result msg
   * 
   * @param commands command list
   * @param isroot whether need to run with root
   * @return
   * @see shellutils#execcommand(string[], boolean, boolean)
   */
  public static commandresult execcommand(list<string> commands, boolean isroot) {
    return execcommand(commands == null ? null : commands.toarray(new string[] {}), isroot, true);
  }

  /**
   * execute shell commands, default return result msg
   * 
   * @param commands command array
   * @param isroot whether need to run with root
   * @return
   * @see shellutils#execcommand(string[], boolean, boolean)
   */
  public static commandresult execcommand(string[] commands, boolean isroot) {
    return execcommand(commands, isroot, true);
  }

  /**
   * execute shell command
   * 
   * @param command command
   * @param isroot whether need to run with root
   * @param isneedresultmsg whether need result msg
   * @return
   * @see shellutils#execcommand(string[], boolean, boolean)
   */
  public static commandresult execcommand(string command, boolean isroot, boolean isneedresultmsg) {
    return execcommand(new string[] {command}, isroot, isneedresultmsg);
  }

  /**
   * execute shell commands
   * 
   * @param commands command list
   * @param isroot whether need to run with root
   * @param isneedresultmsg whether need result msg
   * @return
   * @see shellutils#execcommand(string[], boolean, boolean)
   */
  public static commandresult execcommand(list<string> commands, boolean isroot, boolean isneedresultmsg) {
    return execcommand(commands == null ? null : commands.toarray(new string[] {}), isroot, isneedresultmsg);
  }

  /**
   * execute shell commands
   * 
   * @param commands command array
   * @param isroot whether need to run with root
   * @param isneedresultmsg whether need result msg
   * @return <ul>
   *     <li>if isneedresultmsg is false, {@link commandresult#successmsg} is null and
   *     {@link commandresult#errormsg} is null.</li>
   *     <li>if {@link commandresult#result} is -1, there maybe some excepiton.</li>
   *     </ul>
   */
  public static commandresult execcommand(string[] commands, boolean isroot, boolean isneedresultmsg) {
    int result = -1;
    if (commands == null || commands.length == 0) {
      return new commandresult(result, null, null);
    }

    process process = null;
    bufferedreader successresult = null;
    bufferedreader errorresult = null;
    stringbuilder successmsg = null;
    stringbuilder errormsg = null;

    dataoutputstream os = null;
    try {
      process = runtime.getruntime().exec(isroot ? command_su : command_sh);
      os = new dataoutputstream(process.getoutputstream());
      for (string command : commands) {
        if (command == null) {
          continue;
        }

        // donnot use os.writebytes(commmand), avoid chinese charset error
        os.write(command.getbytes());
        os.writebytes(command_line_end);
        os.flush();
      }
      os.writebytes(command_exit);
      os.flush();

      result = process.waitfor();
      // get command result
      if (isneedresultmsg) {
        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);
        }
      }
    } catch (ioexception e) {
      e.printstacktrace();
    } catch (exception e) {
      e.printstacktrace();
    } finally {
      try {
        if (os != null) {
          os.close();
        }
        if (successresult != null) {
          successresult.close();
        }
        if (errorresult != null) {
          errorresult.close();
        }
      } catch (ioexception e) {
        e.printstacktrace();
      }

      if (process != null) {
        process.destroy();
      }
    }
    return new commandresult(result, successmsg == null ? null : successmsg.tostring(), errormsg == null ? null
        : errormsg.tostring());
  }

  /**
   * result of command
   * <ul>
   * <li>{@link commandresult#result} means result of command, 0 means normal, else means error, same to excute in
   * linux shell</li>
   * <li>{@link commandresult#successmsg} means success message of command result</li>
   * <li>{@link commandresult#errormsg} means error message of command result</li>
   * </ul>
   */
  public static class commandresult {

    /** result of command **/
    public int  result;
    /** success message of command result **/
    public string successmsg;
    /** error message of command result **/
    public string errormsg;

    public commandresult(int result) {
      this.result = result;
    }

    public commandresult(int result, string successmsg, string errormsg) {
      this.result = result;
      this.successmsg = successmsg;
      this.errormsg = errormsg;
    }
  }
}

shellutils代码引用自：trinea

小实例

是否root

public boolean isrooted(){
  commandresult cmdresult = shellutils.execcommand("su", true);
  if (cmdresult.errormsg.equals("permission denied") || cmdresult.result != 0) {

    return false;
  }else{
    return true;
  }
}

复制文件

string[] commands = new string[] { "mount -o rw,remount /system", "cp /mnt/sdcard/xx.apk /system/app/" };

public boolean copyfile(string[] cmdtext){
  commandresult cmdresult = shellutils.execcommand(cmdtext, true);
  if (cmdresult.errormsg.equals("permission denied") || cmdresult.result != 0) {
    return false;
  }else{
    return true;
  }
}

我暂时就举这两个例子，只要你会shell，什么操作都是可以的。

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