Android: Requesting root access in your app

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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Processp;
try{
//Preformsutogetrootprivledges
p=Runtime.getRuntime().exec("su");
//Attempttowriteafiletoaroot-only
DataOutputStreamos=newDataOutputStream(p.getOutputStream());
os.writeBytes("echo/"DoIhaveroot?/">/system/sd/temporary.txt/n");
//Closetheterminal
os.writeBytes("exit/n");
os.flush();
try{
p.waitFor();
if(p.exitValue()!=255){
//TODOCodetorunonsuccess
toastMessage("root");
}
else{
//TODOCodetorunonunsuccessful
toastMessage("notroot");
}
}catch(InterruptedExceptione){
//TODOCodetorunininterruptedexception
toastMessage("notroot");
}
}catch(IOExceptione){
//TODOCodetorunininput/outputexception
toastMessage("notroot");
}

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 exceptiontoastMessage("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

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