retrofit下载大文件注意点和android存储位置

1.retrofit下载大文件需要注意的点：（1）下载代码

try{
int fileSize = mAttachmentFiles.get(index).getFileSize();
InputStream inputStream = null;
OutputStream outputStream = null;
int fileSizeDownloaded = 0;
inputStream = body.byteStream();
try {
byte[] fileReader = new byte[2048];
outputStream = new FileOutputStream(file);
while (true) {
int read = inputStream.read(fileReader);
if (read == -1) {
mHandler.sendEmptyMessage(-1);
turnByIntent();
break;
}
outputStream.write(fileReader, 0, read);
fileSizeDownloaded += read;
int num =(int) (((float)fileSizeDownloaded/ (float) fileSize)*100);
Message msg = mHandler.obtainMessage();
msg.arg1 = num;
mHandler.sendMessage(msg);
}
outputStream.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
inputStream.close();
}
if (outputStream != null) {
outputStream.close();
}
}
} catch (IOException e) {
e.printStackTrace();
}

（2）@Streaming，不能丢，亲测，不加这个注解，会报oom.

2.andoid存储目录：

//Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据9287//Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据  

getCacheDir()方法用于获取/data/data/<application package>/cache目录getFilesDir()方法用于获取/data/data/<application package>/files目录