Android 文件拷贝实现方式

方式一

package com.history.qrdemo.util

import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.io.IOException
import java.nio.channels.FileChannel

class QRFileUtils {
   companion object {
       /**
        * 根据文件路径拷贝文件
        * @param src 源文件
        * @param destPath 目标文件路径
        * @return boolean 成功true、失败false
        */
       fun copyFile(src: File, desFile: File): Boolean {
           if (desFile.exists()) {
               val isSuccess: Boolean = desFile.delete()
               if (!isSuccess) {
                   return false
               }
           }
           try {
               val isSuccess: Boolean = desFile.createNewFile()
               if (!isSuccess) {
                   return false
               }
           } catch (e: IOException) {
               e.printStackTrace()
               return false
           }
           var result = false
           var srcChannel: FileChannel? = null
           var dstChannel: FileChannel? = null
           try {
               srcChannel = FileInputStream(src).channel
               dstChannel = FileOutputStream(desFile).channel
               srcChannel.transferTo(0, srcChannel.size(), dstChannel)
               result = true
           } catch (e: IOException) {
               e.printStackTrace()
           } finally {
               try {
                   srcChannel?.close()
                   dstChannel?.close()
               } catch (e: IOException) {
                   e.printStackTrace()
               }
           }
           return result
       }
   }
}