Android: Requesting root access in your app

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本文介绍了一种在Android应用中请求Root权限的方法，通过运行su命令来尝试获取超级用户权限，并进一步验证是否成功获得权限。该方法适用于已越狱或具有超级用户权限的设备。

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转帖：http://www.stealthcopter.com/blog/2010/01/android-requesting-root-access-in-your-app/

This snippet shows how root access can be requested inside an application in order to write a file into a place we do not have permission to access usually. Requesting root access will only work if your phone allows it, or it has been ‘rooted’ (hacked to allow superuser permissions).

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Process p;
try {
// Preform su to get root privledges
p = Runtime.getRuntime().exec("su");
// Attempt to write a file to a root-only
DataOutputStream os = new DataOutputStream(p.getOutputStream());
os.writeBytes("echo /"Do I have root?/" >/system/sd/temporary.txt/n");
// Close the terminal
os.writeBytes("exit/n");
os.flush();
try {
p.waitFor();
if (p.exitValue() != 255) {
// TODO Code to run on success
toastMessage("root");
}
else {
// TODO Code to run on unsuccessful
toastMessage("not root");
}
} catch (InterruptedException e) {
// TODO Code to run in interrupted exception
toastMessage("not root");
}
} catch (IOException e) {
// TODO Code to run in input/output exception
toastMessage("not root");
}

Process p;
try {
   // Preform su to get root privledges
   p = Runtime.getRuntime().exec("su"); 

   // Attempt to write a file to a root-only
   DataOutputStream os = new DataOutputStream(p.getOutputStream());
   os.writeBytes("echo /"Do I have root?/" >/system/sd/temporary.txt/n");

   // Close the terminal
   os.writeBytes("exit/n");
   os.flush();
   try {
      p.waitFor();
           if (p.exitValue() != 255) {
        	  // TODO Code to run on success
              toastMessage("root");
           }
           else {
        	   // TODO Code to run on unsuccessful
        	   toastMessage("not root");
           }
   } catch (InterruptedException e) {
      // TODO Code to run in interrupted exception
	   toastMessage("not root");
   }
} catch (IOException e) {
   // TODO Code to run in input/output exception
	toastMessage("not root");
}

Where my “toastMessage” is just a function which creates a toast to display on the screen. On phones with superuser permissions installed (root access) this will display a dialog asking the user to allow or deny the application permission to have root access:

android request root access dialog