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 * 
     * Check root * 
  • {@link ShellUtils#checkRootPermission()}
    •  * 
 * 
     * Execte command * 
  • {@link ShellUtils#execCommand(String, boolean)}
    •  * 
  • {@link ShellUtils#execCommand(String, boolean, boolean)}
    •  * 
  • {@link ShellUtils#execCommand(List, boolean)}
    •  * 
  • {@link ShellUtils#execCommand(List, boolean, boolean)}
    •  * 
  • {@link ShellUtils#execCommand(String[], boolean)}
    •  * 
  • {@link ShellUtils#execCommand(String[], boolean, boolean)}
    •  * 
 */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 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 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 
       *     
  • if isNeedResultMsg is false, {@link CommandResult#successMsg} is null and   *     {@link CommandResult#errorMsg} is null.
    •    *     
  • if {@link CommandResult#result} is -1, there maybe some excepiton.
    •    *     
   */  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   * 
       * 
  • {@link CommandResult#result} means result of command, 0 means normal, else means error, same to excute in   * linux shell
    •    * 
  • {@link CommandResult#successMsg} means success message of command result
    •    * 
  • {@link CommandResult#errorMsg} means error message of command result
    •    * 
   */  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。

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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