[移动开发]Android简单的Json 写入 磁盘 和 图片写入存储卡

简简单单的 文字写入磁盘，f方便测试临时数据保存

/**
 * 文件保存工具类
 *
 */
object FileUtil {
    fun saveBitmap(context: Context, bitmap: Bitmap?) = WorkScope.launch {
        val dir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
        val toString = System.currentTimeMillis().toString()
        if (dir != null) {
            saveFile(bitmap, dir.path, "$toString.jpg")
        }
        //如果需要打印日期
//        val calendar = Calendar.getInstance()
//        val simpleDateFormat = SimpleDateFormat("yyyy-MM-DD")
//        val format = simpleDateFormat.format(calendar.time)

    }

    private fun saveFile(bitmap: Bitmap?, path: String, fileName: String): File? {
        bitmap ?: return null
        val dirFile = File(path)
        if (!dirFile.exists()) {
            dirFile.mkdir()
        }
        val myCaptureFile = File(path, fileName)
        try {
            val bos = BufferedOutputStream(FileOutputStream(myCaptureFile))
            bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos)
            bos.flush()
            bos.close()
        } catch (e: FileNotFoundException) {
            e.printStackTrace()
        } catch (e: IOException) {
            e.printStackTrace()
        }
        return myCaptureFile
    }

    fun saveJson(json: String, context: Context) = WorkScope.launch {
        val dir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
        val toString = System.currentTimeMillis().toString()
        if (dir != null) {
            saveJson(json, dir.path, "$toString.json")
        }
    }

    fun saveJson(json: String, path: String, fileName: String): File {
        val dirFile = File(path)
        if (!dirFile.exists()) {
            dirFile.mkdir()
        }
        val myCaptureFile = File(path, fileName)
        try {
//            val bos = BufferedOutputStream(FileOutputStream(myCaptureFile))
            val bos = BufferedWriter(FileWriter(myCaptureFile))
            bos.write(json)
            bos.close()
        } catch (e: FileNotFoundException) {
            e.printStackTrace()
        } catch (e: IOException) {
            e.printStackTrace()
        }
        return myCaptureFile
    }
}