【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>