我尝试从资产复制到SD卡 这是我的代码的一部分
private void CopyAssets(String folder) {
File folders = new File(Environment.getExternalStorageDirectory().toString()+"/beatscache/"+folder);
folders.mkdirs();
AssetManager assetManager = getAssets();
String[] files = null;
try {
files = assetManager.list(folder);
} catch (IOException e) {
Log.e("tag", e.getMessage());
}
for(String filename : files) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(folder+"/"+filename); // if files resides inside the "Files" directory itself
out = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/"+"beatscache"+"/"+folder +"/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(Exception e) {
Log.e("tag", e.getMessage());
}
}
}
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);
}
}
和
CopyAssets("bin");
日志显示
E / tag(3801):/ mnt / sdcard / beatscache / bin / alsa_ctl:open failed:ENOENT (没有这样的文件或目录)
我在AndroidManifest.xml中给出了READ和WRITE权限 并检查Environment.MEDIA_MOUNTED.equals(state)是否返回true。
并没有创建文件夹。
你能说出我做错了吗?
答案 0 :(得分:2)
首先检查文件是否存在,然后将内容移到那里
final File dir = new File(cEnvironment.getExternalStorageDirectory()+"/beatscache/"+folder +"/");
if(dir.exists()==false)
{
dir.mkdirs(); //create folders where write files
final File file = new File(dir, filename);
}