安卓ROOT权限代码

android上root权限的代码，工具类还提供在手机上执行指令的方法。PS：并不是所有手机都能root成功，开发项目时尽量不要考虑root，这个代码看看就行。

[1].[代码] [Java]代码 跳至 [1]

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package com.linin.utils;   import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException;   /**   * root权限工具类   *   * @author linin   *   */ public class RootUtil {        private static final String TAG = "linin.root" ;      private static boolean mHaveRoot = false ;        /**       * 判断机器Android是否已经root，即是否获取root权限       */      public static boolean haveRoot() {          if (!mHaveRoot) {              int ret = execRootCmdSilent( "echo test" ); // 通过执行测试命令来检测              if (ret != - 1 ) {                  L.i(TAG, "have root!" );                  mHaveRoot = true ;              } else {                  L.i(TAG, "not root!" );              }          } else {              L.i(TAG, "mHaveRoot = true, have root!" );          }          return mHaveRoot;      }        /** 获取root权限 */      public static boolean root() {          try {              Runtime.getRuntime().exec(                      new String[] { "/system/bin/su" , "-c" ,                              "chmod 777 /dev/graphics/fb0" });          } catch (IOException e) {              e.printStackTrace();              L.i(TAG, "root fail!" );              return false ;          }          L.i(TAG, "root success!" );          return true ;      }        /**       * 执行命令并且输出结果       */      public static String execRootCmd(String cmd) {          String result = "" ;          DataOutputStream dos = null ;          DataInputStream dis = null ;            try {              Process p = Runtime.getRuntime().exec( "su" ); // 经过Root处理的android系统即有su命令              dos = new DataOutputStream(p.getOutputStream());              dis = new DataInputStream(p.getInputStream());                L.i(TAG, cmd);              dos.writeBytes(cmd + "\n" );              dos.flush();              dos.writeBytes( "exit\n" );              dos.flush();              String line = null ;              while ((line = dis.readLine()) != null ) {                  L.d( "result" , line);                  result += line;              }              p.waitFor();          } catch (Exception e) {              e.printStackTrace();          } finally {              if (dos != null ) {                  try {                      dos.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }              if (dis != null ) {                  try {                      dis.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }          return result;      }        /**       * 执行命令但不关注结果输出       */      public static int execRootCmdSilent(String cmd) {          int result = - 1 ;          DataOutputStream dos = null ;            try {              Process p = Runtime.getRuntime().exec( "su" );              dos = new DataOutputStream(p.getOutputStream());                L.i(TAG, cmd);              dos.writeBytes(cmd + "\n" );              dos.flush();              dos.writeBytes( "exit\n" );              dos.flush();              p.waitFor();              result = p.exitValue();          } catch (Exception e) {              e.printStackTrace();          } finally {              if (dos != null ) {                  try {                      dos.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }          return result;      }   }