【Android】向sdcard中写入文件

一，添加函数

try {

            File saveFile=new File("/sdcard/zhzhg.txt");

       

            FileOutputStream outStream = new FileOutputStream(saveFile);

            try {

                     outStream.write("文件的读写".getBytes());

                 }

            catch (IOException ex)

            {

                    Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);

            }

            try

            {

                outStream.close();

            }

           catch (IOException ex)

          {

                Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);

            }

     }

    catch (FileNotFoundException ex)

    {

            Logger.getLogger(DeviceListActivity.class.getName()).log(Level.SEVERE, null, ex);

    }

二，设置向存储卡读写权限

         在AndroidMainfest.xml文件中添加：

                 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

                <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>