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;

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();
  }
  
  public static boolean checkRootPermission() {
    return execCommand("echo root", true, false).result == 0;
  }
  
  public static CommandResult execCommand(String command, boolean isRoot) {
    return execCommand(new String[] {command}, isRoot, true);
  }
  
  public static CommandResult execCommand(List<String> commands, boolean isRoot) {
    return execCommand(commands == null ? null : commands.toArray(new String[] {}), isRoot, true);
  }
  
  public static CommandResult execCommand(String[] commands, boolean isRoot) {
    return execCommand(commands, isRoot, true);
  }
  
  public static CommandResult execCommand(String command, boolean isRoot, boolean isNeedResultMsg) {
    return execCommand(new String[] {command}, isRoot, isNeedResultMsg);
  }
  
  public static CommandResult execCommand(List<String> commands, boolean isRoot, boolean isNeedResultMsg) {
    return execCommand(commands == null ? null : commands.toArray(new String[] {}), isRoot, isNeedResultMsg);
  }
  
  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());
  }
  
  public static class CommandResult {
    
    public int  result;
    
    public String successMsg;
    
    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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