android 文件保存到应用和sd卡中

<span style="font-size:18px;">1.权限添加

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

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

 

 

public static String getDataFolderPath(Context paramContext) {

        return Environment.getDataDirectory() + "/data/"

                + paramContext.getPackageName() + "/files";

    }

 

    public static String getMyFileDir(Context context){

        return context.getFilesDir().toString();

    }

     

    public static String getMyCacheDir(Context context){

        return context.getCacheDir().toString();

    }

    /**

     * @desc 保存内容到文件中

     * @param fileName

     * @param content

     * @throws Exception

     */

    public static void save(Context context, String fileName, String content, int module) {

        try {

            FileOutputStream os = context.openFileOutput(fileName, module);

            os.write(content.getBytes());

            os.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

     

    /**

     * @desc 读取文件内容

     * @param fileName

     * @return

     */

    public static String read(Context context, String fileName){

         

        try {

            FileInputStream fis = context.openFileInput(fileName);

            ByteArrayOutputStream bos = new ByteArrayOutputStream();

            byte[] b = new byte[1024];

            int len = 0;

            while((len = fis.read(b)) != -1){

                bos.write(b, 0, len);

            }

            byte[] data = bos.toByteArray();

            fis.close();

            bos.close();

            return new String(data);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return  null;

    }

     

     

    /**

     * @desc 将文本内容保存到sd卡的文件中

     * @param context

     * @param fileName

     * @param content

     * @throws IOException

     */

    public static void saveToSDCard(Context context, String fileName, String content) throws IOException{

         

        File file = new File(Environment.getExternalStorageDirectory(),fileName);

        FileOutputStream fos = new FileOutputStream(file);

        fos.write(content.getBytes());

        fos.close();

    }

 

    /**

     * @desc 读取sd卡文件内容

     * @param fileName

     * @return

     * @throws IOException

     */

    public static String readSDCard(String fileName) throws IOException {

         

        File file = new File(Environment.getExternalStorageDirectory(),fileName);

        FileInputStream fis = new FileInputStream(file);

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        byte[] buffer =  new byte[1024];

        int len = 0;

        while((len = fis.read(buffer)) != -1)

        {

            bos.write(buffer, 0, len);

        }

        byte[]  data = bos.toByteArray();

        fis.close();

        bos.close();

         

        return new String(data);

    }</uses-permission></uses-permission></span>

 

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