Android 设备节点操作

1. 获取root权限操作节点

 public boolean execSuCmd(String cmd){
        if(isRoot()){
            Process process = null;
            DataOutputStream os = null;

            try {

                process = Runtime.getRuntime().exec("su");
                os = new DataOutputStream(process.getOutputStream());
                os.writeBytes(cmd + "\n");
                os.writeBytes("exit\n");
                os.flush();
                process.waitFor();

            } catch (Exception e) {
                Log.e(TAG, "ROOT REE" + e.getMessage());
                return false;
            } finally {

                try {
                    if (os != null) {
                        os.close();
                    }
                    process.destroy();
                } catch (Exception e) {
                }
            }

            Log.d(TAG, "Root SUC ");
            return true;
        }else{
            return false;
        }
    }
    public void smdtGetSystemLogcat(String folderPath){

    }
    public int smdtSetControl(int type, int values){
        return 0;
    }

    /**
     * 判断手机是否ROOT
     */
    private static boolean isRoot() {

        boolean root = false;

        try {
            if ((!new File("/system/bin/su").exists())
                    && (!new File("/system/xbin/su").exists())) {
                root = false;
            } else {
                root = true;
            }

        } catch (Exception e) {
            Log.e(TAG, "isRoot " + e.getMessage());
        }

        return root;
    }

    private static String 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 = new DataOutputStream(p.getOutputStream());
            dis = new DataInputStream(p.getInputStream());

            Log.d(TAG, cmd);
            dos.writeBytes(cmd + "\n");
            dos.flush();
            dos.writeBytes("exit\n");
            dos.flush();
            String line = null;
            while ((line = dis.readLine()) != null) {
                Log.d(TAG,"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();
                }
            }
        }

        Log.d(TAG,result);
        return result;
    }

　　

2. IO 操作的 读方法

 

    /**
     * 获取节点
     */
    private static String getString(String path) {
        String prop = "waiting";// 默认值
        try {
            BufferedReader reader = new BufferedReader(new FileReader(path));
            prop = reader.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return prop;
    }

 

　　写方法

 private static final String WAKE_PATH = "/sys/class/demo/wake";
    ......
        try {
            BufferedWriter bufWriter = null;
            bufWriter = new BufferedWriter(new FileWriter(WAKE_PATH));
            bufWriter.write("1");  // 写操作
            bufWriter.close();
            Toast.makeText(getApplicationContext(),
                    "功能已激活",Toast.LENGTH_SHORT).show();
            Log.d(TAG,"功能已激活 angle " + getString(ANGLE_PATH));
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(TAG,"can't write the " + WAKE_PATH);
        }