给Android应用程序的根访问权限

我正在构建一个应用程序，该应用程序必须具有超级用户权限才能在/ data目录中写入修改数据库文件的内容。我写一些代码，获得root访问权限，但它给我的日志不能“获得root权限或用户拒绝”给Android应用程序的根访问权限

我的代码是

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     if(canRunRootCommands()) 
      Toast.makeText(this, "Can Run Root Commands", Toast.LENGTH_LONG).show(); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    public static boolean canRunRootCommands() 
     { 
      boolean retval = false; 
      Process suProcess; 

      try 
      { 
      suProcess = Runtime.getRuntime().exec("su"); 

      DataOutputStream os = new DataOutputStream(suProcess.getOutputStream()); 
      DataInputStream osRes = new DataInputStream(suProcess.getInputStream()); 

      if (null != os && null != osRes) 
      { 
       // Getting the id of the current user to check if this is root 
       os.writeBytes("id\n"); 
       os.flush(); 

       String currUid = osRes.readLine(); 
       boolean exitSu = false; 
       if (null == currUid) 
       { 
        retval = false; 
        exitSu = false; 
        Log.d("ROOT", "Can't get root access or denied by user"); 
       } 
       else if (true == currUid.contains("uid=0")) 
       { 
        retval = true; 
        exitSu = true; 
        Log.d("ROOT", "Root access granted"); 
       } 
       else 
       { 
        retval = false; 
        exitSu = true; 
        Log.d("ROOT", "Root access rejected: " + currUid); 
       } 

       if (exitSu) 
       { 
        os.writeBytes("exit\n"); 
        os.flush(); 
       } 
      } 
      } 
      catch (Exception e) 
      { 
      // Can't get root ! 
      // Probably broken pipe exception on trying to write to output stream (os) after su failed, meaning that the device is not rooted 

      retval = false; 
      Log.d("ROOT", "Root access rejected [" + e.getClass().getName() + "] : " + e.getMessage()); 
      } 

      return retval; 
     }

如何获得root权限的，这样我可以更新数据库文件？

来源

2013-02-26 Ritesh Mehandiratta

大多数Android设备的根访问权限受到限制。你必须得到这一点，通常排除设备的保修...... – ppeterka 2013-02-26 10:25:28

意味着我不能根本访问大多数的Android设备？通过任何方法？ – 2013-02-26 10:33:36

没有。根植的访问权限仅限于决定根植他们电话（少数）的用户，并且明确允许您的应用程序根访问。 – Budius 2013-02-26 10:50:16