android判斷手機是否root

關於判斷手機是否已經root的方法。如果app有一些特殊功能需要root權限，則需要判斷是否root。比如一些市場下載完app後自動安裝。

/**
 * @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 executeCommand(SHELL_CMD shellCmd){
        String line = null;
        ArrayList fullResponse = new ArrayList();
        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;
    }

}

代碼來自stackoverflow，向作者致敬。

方法2：

The RootTools library offers simple methods to check for root:

一個開源項目：http://code.google.com/p/roottools/

RootTools.isRootAvailable()判斷是否root

RootTools.isAccessGiven()返回true那麼手機已經root並且app也被授予root權限。

另外：據那片帖子的一個回貼人說使用

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) {
            }
        }
    }
}

會引起非常嚴重的性能問題，將手機系統拖的非常慢，當應用多次啟動後會創建出很多個僵死的進程耗用內存。
參考http://stackoverflow.com/questions/1101380/determine-if-running-on-a-rooted-device

To sum up; I have no advice for you to determine if device is rooted or not. But if I were you I would not use Runtime.getRuntime().exec().

By the way; RootTools.isRootAvailable() causes same problem.
The RootTools library offers simple methods to check for root: