android 移动文件到外置sdcard,Android 将assets中的文件复制到外置sdcard卡

Android 将assets中的文件复制到外置sdcard卡

在assets文件夹中的文件的访问是通过

InputStream inputStream = context.getAssets().open("FileName");

列出assets中某个目录下的所有的文件及文件夹

String[] srcFiles = context.getAssets().list("assetsPath");

如 assets/folder/文件夹中所有的文件

String[] srcFiles = context.getAssets().list("folder");

将assets中某个文件夹的文件复制到外置sdcard中

核心代码如下：

package com.android.example.assets;

import android.content.Context;

import android.util.Log;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

public class Utils{

public static void doCopy(Context context, String assetsPath, String desPath) throws IOException {

String[] srcFiles = context.getAssets().list(assetsPath);//for directory

for (String srcFileName : srcFiles) {

String outFileName = desPath + File.separator + srcFileName;

String inFileName = assetsPath + File.separator + srcFileName;

if (assetsPath.equals("")) {// for first time

inFileName = srcFileName;

}

Log.e("tag","========= assets: "+ assetsPath+" filename: "+srcFileName +" infile: "+inFileName+" outFile: "+outFileName);

try {

InputStream inputStream = context.getAssets().open(inFileName);

copyAndClose(inputStream, new FileOutputStream(outFileName));

} catch (IOException e) {//if directory fails exception

e.printStackTrace();

new File(outFileName).mkdir();

doCopy(context,inFileName, outFileName);

}

}

}

private static void closeQuietly(OutputStream out){

try{

if(out != null) out.close();;

}catch (IOException ex){

ex.printStackTrace();

}

}

private static void closeQuietly(InputStream is){

try{

if(is != null){

is.close();

}

}catch (IOException ex){

ex.printStackTrace();

}

}

private static void copyAndClose(InputStream is, OutputStream out) throws IOException{

copy(is,out);

closeQuietly(is);

closeQuietly(out);

}

private static void copy(InputStream is, OutputStream out) throws IOException{

byte[] buffer = new byte[1024];

int n = 0;

while(-1 != (n = is.read(buffer))){

out.write(buffer,0,n);

}

}

}