針對linux系統

1. 直接使用“su“命令，提高所操作檔案許可權即可

針對於anroid/java程式碼中需要改變某些檔案的許可權，例如讀寫許可權，操作許可權等的使用方式（相當如如何java呼叫linux命令）

public static String exec(String cmd) {
        try {
            if (cmd != null) {
                Runtime rt = Runtime.getRuntime();
                Process process = rt.exec("su"
 
);//Root   //Process process = rt.exec("sh");//
                DataOutputStream dos = new DataOutputStream(process.getOutputStream());
                dos.writeBytes(cmd + "\n");
                dos.flush();
                dos.writeBytes("exit\n");
                dos.flush();
                InputStream myin = process.getInputStream();
                InputStreamReader is
 
 = new InputStreamReader(myin);
                char[] buffer = new char[1024];
                int bytes_read = is.read(buffer);
                StringBuffer aOutputBuffer = new StringBuffer();
                while (bytes_read > 0) {
                    aOutputBuffer.append(buffer, 0, bytes_read);
                    bytes_read = is
 
.read(buffer);
                }
                Log.e(TAG, aOutputBuffer.toString());
                return aOutputBuffer.toString();
            } else {
                return "please input true cmd";
            }
        } catch (IOException e) {
            e.printStackTrace();
            return "operater err";
        }
    }

使用方式

ChangeBuildPropTools.exec("chmod -R 777" + EMAIL_SEAFILE_PATH);