Android應用程序請求root訪問

前提是手機已經破解獲取root權限
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).

1. Process p;
    
2. try {
    
3.    // Preform su to get root privledges
    
4.    p = Runtime.getRuntime().exec("su"); 
    
5. 
    
6.    // Attempt to write a file to a root-only
    
7.    DataOutputStream os = new DataOutputStream(p.getOutputStream());
    
8.    os.writeBytes("echo \"Do I have root?\" >/system/sd/temporary.txt\n");
    
9. 
    
10.    // Close the terminal
     
11.    os.writeBytes("exit\n");
     
12.    os.flush();
     
13.    try {
     
14.       p.waitFor();
     
15.            if (p.exitValue() != 255) {
     
16.                   // TODO Code to run on success
     
17.               toastMessage("root");
     
18.            }
     
19.            else {
     
20.                    // TODO Code to run on unsuccessful
     
21.                    toastMessage("not root");
     
22.            }
     
23.    } catch (InterruptedException e) {
     
24.       // TODO Code to run in interrupted exception
     
25.            toastMessage("not root");
     
26.    }
     
27. } catch (IOException e) {
     
28.    // TODO Code to run in input/output exception
     
29.         toastMessage("not root");
     
30. }

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