RootCmd.java

package com.ezio.multiwii.helpers; 
  
 import java.io.DataInputStream; 
 import java.io.DataOutputStream; 
 import java.io.IOException; 
  
 import android.util.Log; 
  
 public final class RootCmd { 
  
     private static final String TAG = "RootCmd"; 
     private static boolean mHaveRoot = false; 
  
     // �жϻ���Android�Ƿ��Ѿ�root�����Ƿ��ȡrootȨ�� 
     public static boolean haveRoot() { 
         if (!mHaveRoot) { 
             int ret = execRootCmdSilent("echo test"); // ͨ��ִ�в������������ 
             if (ret != -1) { 
                 Log.i(TAG, "have root!"); 
                 mHaveRoot = true; 
             } else { 
                 Log.i(TAG, "not root!"); 
             } 
         } else { 
             Log.i(TAG, "mHaveRoot = true, have root!"); 
         } 
         return mHaveRoot; 
     } 
  
     // ִ������������� 
     public static String execRootCmd(String cmd) { 
         String result = ""; 
         DataOutputStream dos = null; 
         DataInputStream dis = null; 
          
         try { 
             Process p = Runtime.getRuntime().exec("su");// ����Root�����androidϵͳ����su���� 
             dos = new DataOutputStream(p.getOutputStream()); 
             dis = new DataInputStream(p.getInputStream()); 
  
             Log.i(TAG, cmd); 
             dos.writeBytes(cmd + "\n"); 
             dos.flush(); 
             dos.writeBytes("exit\n"); 
             dos.flush(); 
             String line = null; 
             while ((line = dis.readLine()) != null) { 
                 Log.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; 
     } 
  
     // ִ���������ע������ 
     public static int execRootCmdSilent(String cmd) { 
         int result = -1; 
         DataOutputStream dos = null; 
          
         try { 
             Process p = Runtime.getRuntime().exec("su"); 
             dos = new DataOutputStream(p.getOutputStream()); 
              
             Log.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; 
     } 
 }