现在Android手机root权限可以说是轻松就获取得到的，而关于判断手机是否已经root的方法，你了解吗？如果app有一些特殊功能需要root权限，则需要判断是否root。不知道root是不是意味着手机不安全？说到底还是想一台究竟，你可以学习。下面介绍两种方法：

 

方法1：

/**

* @author Kevin Kowalewski

*

*/

public class Root {

private static String LOG_TAG = Root.class.getName();

public boolean isDeviceRooted() {

if (checkRootMethod1()){return true;}

if (checkRootMethod2()){return true;}

if (checkRootMethod3()){return true;}

return false;

}

public boolean checkRootMethod1(){

String buildTags = android.os.Build.TAGS;

if (buildTags != null && buildTags.contains(“test-keys”)) {

return true;

}

return false;

}

public boolean checkRootMethod2(){

try {

File file = new File(“/system/app/Superuser.apk”);

if (file.exists()) {

return true;

}

} catch (Exception e) { }

return false;

public boolean checkRootMethod3() {

if (new ExecShell().executeCommand(SHELL_CMD.check_su_binary) != null){

return true;

}else{

return false;

}

}

}

/**

* @author Kevin Kowalewski

*

*/

public class ExecShell {

private static String LOG_TAG = ExecShell.class.getName();

public static enum SHELL_CMD {

check_su_binary(new String[] {“/system/xbin/which”,”su”}),

;

String[] command;

SHELL_CMD(String[] command){

this.command = command;

}

}

public ArrayList<String> executeCommand(SHELL_CMD shellCmd){

String line = null;

ArrayList<String> fullResponse = new ArrayList<String>();

Process localProcess = null;

try {

localProcess = Runtime.getRuntime().exec(shellCmd.command);

} catch (Exception e) {

return null;

//e.printStackTrace();

}

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(localProcess.getOutputStream()));

BufferedReader in = new BufferedReader(new InputStreamReader(localProcess.getInputStream()));

try {

while ((line = in.readLine()) != null) {

Log.d(LOG_TAG, “–> Line received: ” + line);

fullResponse.add(line);

}

} catch (Exception e) {

e.printStackTrace();

}

Log.d(LOG_TAG, “–> Full response was: ” + fullResponse);

return fullResponse;

}

}

代码来自stackoverflow，向作者致敬。

方法2：

The RootTools library offers simple methods to check for root:

一个开源项目：http://code.google.com/p/roottools/

RootTools.isRootAvailable()判断是否root

RootTools.isAccessGiven()返回true那么手机已经root并且app也被授予root权限。

String commandToExecute = “su”;

executeShellCommand(commandToExecute);

private boolean executeShellCommand(String command){

Process process = null;

try{

process = Runtime.getRuntime().exec(command);

return true;

} catch (Exception e) {

return false;

} finally{

if(process != null){

try{

process.destroy();

}catch (Exception e) {

}

}

}

}

ps：使用这些方法有可能将手机系统拖的非常慢，当应用多次启动后会创建出很多个僵死的进程耗用内存。

 

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