从资产到本地目录复制目录 [英] Copy directory from Assets to local directory
问题描述
我想用，我在我的资产文件夹和访问它作为一个文件的目录。是否有可能访问的东西，在资产目录作为文件？如果没有，我怎样才能从资产的文件夹目录复制到应用程序的本地目录？
我会复制文件，如下所示：
尝试
{
InputStream的流= this.getAssets（）开（MYFILE）。
的OutputStream输出=新的BufferedOutputStream（新的FileOutputStream（this.getFilesDir（）+/ myNewFile））;
字节的数据[] =新的字节[1024];
诠释计数;
而（（计数= stream.read（数据））！= - 1）
{
output.write（数据，0，计数）;
}
output.flush（）;
output.close（）;
stream.close（）;
}
赶上（IOException异常E）
{
e.printStackTrace（）;
}
不过，我不知道我会怎样能够做到这一点的一个目录。
我宁愿不建立自己身边的东西，不工作的基础，所以我怎么会从资产中复制一个目录到本地目录，或是否有可能访问我的资产目录作为文件？
修改的
这是我如何解决它为我自己的项目：
的InputStream流= NULL;
OutputStream的输出= NULL;
对于（字符串文件名：this.getAssets（）列表（demopass））
{
流= this.getAssets（）开（目录名/+文件名）。
输出=新的BufferedOutputStream（新的FileOutputStream（this.getFilesDir（）+/ newDirectory /+文件名））;
字节的数据[] =新的字节[1024];
诠释计数;
而（（计数= stream.read（数据））！= - 1）
{
output.write（数据，0，计数）;
}
output.flush（）;
output.close（）;
stream.close（）;
流= NULL;
输出= NULL;
}
由于上述意见建议的dmaxi，你可以用自己的链接，与此code：
无效displayFiles（AssetManager经理，字符串路径）{
尝试 {
字符串列表[] = mgr.list（路径）;
如果（名单！= NULL）
的for（int i = 0; I＆LT; list.length ++ I）
{
Log.v（资产，路径+/+列表[I]）;
displayFiles（MGR，路径+/+列表[I]）;
}
}赶上（IOException异常E）{
Log.v（列出的错误：，不能列出+路径）;
}
}
我把它放在<一个href="http://stackoverflow.com/questions/1495585/how-can-i-get-a-directory-listing-of-resources-from-my-android-app?lq=1">this链接。 也许你可以将这个code以precedent之一。
编辑：又见 AssetManager
私人无效copyFolder（字符串名称）{
//名是你的文件夹的名称！
AssetManager assetManager = getAssets（）;
的String []文件= NULL;
字符串状态= Environment.getExternalStorageState（）;
如果（Environment.MEDIA_MOUNTED.equals（州））{
//我们可以读取和写入的媒体
//检查资产子文件夹中的文件
尝试 {
文件= assetManager.list（名称）;
}赶上（IOException异常E）{
Log.e（错误，无法获取资源文件列表。，E）;
}
//分析资产子文件夹中的所有文件
对于（字符串文件名：文件）{
在的InputStream = NULL;
出的OutputStream = NULL;
//第一：检查是否已经有一个目标文件夹
文件夹=新的文件（Environment.getExternalStorageDirectory（）+/ yourTargetFolder /+姓名）;
布尔成功= TRUE;
如果（！folder.exists（））{
成功= folder.mkdir（）;
}
如果（成功）{
//移动的外置SD所有文件
尝试 {
在= assetManager.open（名称+/+文件名）;
OUT =新的FileOutputStream（Environment.getExternalStorageDirectory（）+/ yourTargetFolder /+姓名+/+文件名）;
Log.i（web视图，Environment.getExternalStorageDirectory（）+/ yourTargetFolder /+名称+/+文件名）;
的CopyFile（IN，OUT）;
附寄（）;
在= NULL;
了out.flush（）;
out.close（）;
OUT = NULL;
}赶上（IOException异常E）{
Log.e（错误，无法复制资源文件：+文件名，E）;
} 最后 {
//编辑3（MMS后评论）
附寄（）;
在= NULL;
了out.flush（）;
out.close（）;
OUT = NULL;
}
}
其他 {
//做别的事情上失败
}
}
}否则，如果（Environment.MEDIA_MOUNTED_READ_ONLY.equals（州））{
//我们只能读取介质
} 其他 {
//别的东西是错误的。这可能是很多其他的国家之一，但我们需要
//是知道的是，我们既不能读也不能写
}
}
//使用copyAssets（）故意复制文件的方法。
私人无效的CopyFile（在的InputStream，OutputStream的了）抛出IOException异常{
byte []的缓冲区=新的字节[1024];
INT读取;
而（（读= in.read（缓冲））！= -1）{
out.write（缓冲，0，读）;
}
}
编辑2： i'have在上面添加一个例子：这块code复制从资产只有一个特定的文件夹，到SD卡。让我知道，如果它的工作原理！
I'm trying to use a directory that I have in my assets folder and access it as a File. Is it possible to access something in the Assets directory as a File? If not, how can I copy a directory from the Assets folder to the application's local directory?
I would copy a file like so:
try
{
InputStream stream = this.getAssets().open("myFile");
OutputStream output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/myNewFile"));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
}
catch(IOException e)
{
e.printStackTrace();
}
However, I'm not sure how I would be able to do this for a directory.
I would rather not build my infrastructure around something that doesn't work, so how would I copy a directory from Assets to a local directory, or is it possible to access a directory in my Assets as a File?
EDIT
This is how I solved it for my own project:
InputStream stream = null;
OutputStream output = null;
for(String fileName : this.getAssets().list("demopass"))
{
stream = this.getAssets().open("directoryName/" + fileName);
output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/newDirectory/" + fileName));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
stream = null;
output = null;
}
As suggested by dmaxi in comment above, you can use his link, with this code:
void displayFiles (AssetManager mgr, String path) {
try {
String list[] = mgr.list(path);
if (list != null)
for (int i=0; i<list.length; ++i)
{
Log.v("Assets:", path +"/"+ list[i]);
displayFiles(mgr, path + "/" + list[i]);
}
} catch (IOException e) {
Log.v("List error:", "can't list" + path);
}
}
I took it on this link. Maybe you can combine this code with precedent one.
EDIT: see also AssetManager.
private void copyFolder(String name) {
// "Name" is the name of your folder!
AssetManager assetManager = getAssets();
String[] files = null;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
// Checking file on assets subfolder
try {
files = assetManager.list(name);
} catch (IOException e) {
Log.e("ERROR", "Failed to get asset file list.", e);
}
// Analyzing all file on assets subfolder
for(String filename : files) {
InputStream in = null;
OutputStream out = null;
// First: checking if there is already a target folder
File folder = new File(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
// Moving all the files on external SD
try {
in = assetManager.open(name + "/" +filename);
out = new FileOutputStream(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
Log.i("WEBVIEW", Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(IOException e) {
Log.e("ERROR", "Failed to copy asset file: " + filename, e);
} finally {
// Edit 3 (after MMs comment)
in.close();
in = null;
out.flush();
out.close();
out = null;
}
}
else {
// Do something else on failure
}
}
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
} else {
// Something else is wrong. It may be one of many other states, but all we need
// is to know is we can neither read nor write
}
}
// Method used by copyAssets() on purpose to copy a file.
private void copyFile(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
int read;
while((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
}
EDIT 2: i'have added an example above: this piece of code copy only a specific folder from assets, to sd card. Let me know if it works!
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