判断root

转自：http://www.oschina.net/code/snippet_816576_43883

弹框：

packagecom.linin.utils;
 
importjava.io.DataInputStream;
importjava.io.DataOutputStream;
importjava.io.IOException;
 
/**
 * root权限工具类
 *
 * @author linin
 *
 */
publicclassRootUtil {
 
    privatestaticfinal String TAG = "linin.root";
    privatestaticboolean mHaveRoot = false;
 
    /**
     * 判断机器Android是否已经root，即是否获取root权限
     */
    publicstaticboolean haveRoot() {
        if(!mHaveRoot) {
            intret = execRootCmdSilent("echo test");// 通过执行测试命令来检测
            if(ret != -1) {
                L.i(TAG,"have root!");
                mHaveRoot = true;
            }else{
                L.i(TAG,"not root!");
            }
        }else{
            L.i(TAG,"mHaveRoot = true, have root!");
        }
        returnmHaveRoot;
    }
 
    /** 获取root权限 */
    publicstaticboolean root() {
        try{
            Runtime.getRuntime().exec(
                    newString[] { "/system/bin/su","-c",
                            "chmod 777 /dev/graphics/fb0" });
        }catch(IOException e) {
            e.printStackTrace();
            L.i(TAG,"root fail!");
            returnfalse;
        }
        L.i(TAG,"root success!");
        returntrue;
    }
 
    /**
     * 执行命令并且输出结果
     */
    publicstaticString execRootCmd(String cmd) {
        String result = "";
        DataOutputStream dos = null;
        DataInputStream dis = null;
 
        try{
            Process p = Runtime.getRuntime().exec("su");// 经过Root处理的android系统即有su命令
            dos = newDataOutputStream(p.getOutputStream());
            dis = newDataInputStream(p.getInputStream());
 
            L.i(TAG, cmd);
            dos.writeBytes(cmd + "\n");
            dos.flush();
            dos.writeBytes("exit\n");
            dos.flush();
            String line = null;
            while((line = dis.readLine()) != null) {
                L.d("result", line);
                result += line;
            }
            p.waitFor();
        }catch(Exception e) {
            e.printStackTrace();
        }finally{
            if(dos != null) {
                try{
                    dos.close();
                }catch(IOException e) {
                    e.printStackTrace();
                }
            }
            if(dis != null) {
                try{
                    dis.close();
                }catch(IOException e) {
                    e.printStackTrace();
                }
            }
        }
        returnresult;
    }
 
    /**
     * 执行命令但不关注结果输出
     */
    publicstaticint execRootCmdSilent(String cmd) {
        intresult = -1;
        DataOutputStream dos = null;
 
        try{
            Process p = Runtime.getRuntime().exec("su");
            dos = newDataOutputStream(p.getOutputStream());
 
            L.i(TAG, cmd);
            dos.writeBytes(cmd + "\n");
            dos.flush();
            dos.writeBytes("exit\n");
            dos.flush();
            p.waitFor();
            result = p.exitValue();
        }catch(Exception e) {
            e.printStackTrace();
        }finally{
            if(dos != null) {
                try{
                    dos.close();
                }catch(IOException e) {
                    e.printStackTrace();
                }
            }
        }
        returnresult;
    }
 
}

不弹框：

    public boolean isRootedByFile() {
        boolean isRoot = false;
        try {
            if (isFileExists("/system/bin/su") || isFileExists("/system/xbin/su") ||
                    isFileExists("/system/app/superuser.apk") || isFileExists("/system/app/SuperSU.apk")) {
                isRoot = true;
            } else {
                if(isFileExists("data/data/com.noshufou.android.su")) {
                    isRoot = true;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isRoot;
    }

    public boolean isFileExists(String path) {
        return new File(path).exists();
    }

    public static boolean isRootedByExec() {
        boolean isRooted = false;
        int ret = execRootCmdSilent("echo test"); // 通过执行测试命令来检测
        if (ret != -1) {
            isRooted = true;
        }
        return isRooted;
    }

    public static int execRootCmdSilent(String cmd) {
        int result = -1;
        DataOutputStream dos = null;
        try {
            Process p = Runtime.getRuntime().exec("su");
            dos = new DataOutputStream(p.getOutputStream());
            dos.writeBytes(cmd + "\n");
            dos.flush();
            dos.writeBytes("exit\n");
            dos.flush();
            p.waitFor();
            result = p.exitValue();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (dos != null) {
                try {
                    dos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }

    public boolean isRootedByFile() {
        boolean isRoot = false;
        try {
            if (isFileExists("/system/bin/su") || isFileExists("/system/xbin/su") ||
                    isFileExists("/system/app/superuser.apk") || isFileExists("/system/app/SuperSU.apk")) {
                isRoot = true;
            } else {
                if(isFileExists("data/data/com.noshufou.android.su")) {
                    isRoot = true;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isRoot;
    }

    public boolean isFileExists(String path) {
        return new File(path).exists();
    }

不弹框：

//check rooted routine
        BroadcastReceiver rootReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                int result = intent.getIntExtra("Result", 0);
                if (result == 1) {
                    mIsRooted = false;
                } else {
                    mIsRooted = true;
                }
                unregisterReceiver(mRootReceiver);
            }
        };

        registerReceiver(rootReceiver, new IntentFilter("com.sec.intent.action.SYSSCOPESTATUS"));

通过SYSSCOPESTATUS判断：(sysscope SYSTEM STATUS: Custom)

BroadcastReceiver mRootReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        boolean isRoot = (intent.getIntExtra("Result", 0) != 1);
    }
};