我在我的应用程序中使用了一项服务，该服务曾经用于在后台下载一些“ apk”文件。
我想用接收到的文件大小检查下载的文件大小，以确保完全获得“ apk”。
但是当我使用response.body().contentLength()时为-1！
这是我的代码：
private void downloadAppFromServer(String url, final String fileId) {
APIService downloadService = ServiceGenerator.createServiceFile(APIService.class, "181412655", "181412655");
Call<ResponseBody> call = downloadService.downloadFileWithDynamicUrlSync(url);
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, final Response<ResponseBody> response) {
if (response.isSuccess()) {
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... voids) {
Log.d("LOGO", "server contacted and has file");
Log.d("LOGO", "FILE SIZE: " + response.body().contentLength());
boolean writtenToDisk = writeResponseBodyToDisk(response.body(), fileId);
Log.d("LOGO", "file download was a success? " + writtenToDisk);
return null;
}
}.execute();
}
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
});
}
这是我的writeToDisk方法：
private boolean writeResponseBodyToDisk(ResponseBody body, String fileId) {
try {
// Location to save downloaded file and filename
File DownloadFile = new File(G.DIR_APK + "/" + fileId + ".apk");
InputStream inputStream = null;
OutputStream outputStream = null;
try {
byte[] fileReader = new byte[4096];
long fileSize = body.contentLength();
long fileSizeDownloaded = 0;
inputStream = body.byteStream();
Log.d("LOGO", "file size is: " + fileSize ); //This is -1 !
outputStream = new FileOutputStream(DownloadFile);
while (true) {
int read = inputStream.read(fileReader);
if (read == -1) {
break;
}
outputStream.write(fileReader, 0, read);
fileSizeDownloaded += read;
}
outputStream.flush();
if (fileSize == fileSizeDownloaded) {
return true;
} else {
return false;
}
} catch (IOException e) {
return false;
} finally {
if (inputStream != null) {
inputStream.close();
}
if (outputStream != null) {
outputStream.close();
}
}
} catch (IOException e) {
return false;
}
}
最佳答案
-1表示Web服务器不提供有关文件长度的任何信息。
改造获得标头content-length。如果不存在，则response.body().contentLength()返回-1。