是否允许从不同的线程并行多次调用 Retrofit 的 execute() 方法？

Question

我需要使用retrofit从服务器下载mp3文件。使用enqueue((方法，响应回调来自UI线程。因此，我决定使用工作线程中的execute((方法。但我的要求是，我需要并行下载多个mp3文件。下面是我的代码，你能告诉我这是否是一个好的做法，或者请给我一个更好的方法。

@Override
public void onClick(View v) {
final DownloadAndStoreMusic downloadAndStoreMusic = new DownloadAndStoreMusic(this);
new Thread(new Runnable() {
@Override
public void run() {
downloadAndStoreMusic.downloadLoadMusic(musicUrlForPerseFromServer, musicUrlforLocalStorage, actionString,categoryIndex,itemIndex);
}
}).start();
}

关于下载类

public class DownloadAndStoreMusic {
private static final String TAG = "tag";
ApiInterfaceforMusicPersing apiInterfaceforMusicPersing;
Context mContext;
DownloadAndStoreMusic(Context mContext) {
apiInterfaceforMusicPersing = RetrofitApiClientForMusicPersing.getClient().create(ApiInterfaceforMusicPersing.class);
this.mContext = mContext;
}
public void downloadLoadMusic(final String musicUrlForPerseFromServer, final String musicUrlforLocalStorage, final String actionString,final int categoryIndex, final int itemIndex) {
/* String[] split = url.split("/");
final String pathToLocalStorage = url;  // We bought music location with category path
String musicLink = split[1];*/
Log.e("server", musicUrlForPerseFromServer);
Log.e("perse", musicUrlforLocalStorage);
Call<ResponseBody> responseBodyCall = apiInterfaceforMusicPersing.downloadMusic(musicUrlForPerseFromServer);
/*  responseBodyCall.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, final Response<ResponseBody> response) {
Log.e("music", "completed");
new Thread(new Runnable() {
@Override
public void run() {
writeResponseBodyToDisk(response.body(), musicUrlforLocalStorage, musicUrlForPerseFromServer, actionString,categoryIndex,itemIndex);
}
}).start();
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Toast.makeText(mContext, "Problem downloading audio", Toast.LENGTH_SHORT).show();
}
});*/
try
{
Response<ResponseBody> execute = responseBodyCall.execute();
ResponseBody body = execute.body();
writeResponseBodyToDisk(body, musicUrlforLocalStorage, musicUrlForPerseFromServer, actionString,categoryIndex,itemIndex);
}
catch (Exception e)
{
Toast.makeText(mContext, "Problem downloading audio", Toast.LENGTH_SHORT).show();
Log.e("exception"," : "+e+ " , "+musicUrlforLocalStorage);
}

}
private boolean writeResponseBodyToDisk(ResponseBody body, String pathToLocalStorage, String musicUrlForPerseFromServer, String actionString, int categoryIndex, int itemIndex) {

try {
// todo change the file location/name according to your needs
/* File audioParentDirectory;
String[] split = musicUrlForPerseFromServer.split("/");
String parentPath = split[0];
String audioName = split[1];
audioParentDirectory = new File(MyConstants.FILE_AUDIO_DIRECTORY, parentPath);
File parent = new File(audioParentDirectory,parentPath);
Log.e("audioparent",audioParentDirectory.getAbsolutePath());*/

File audioDirectory = new File(pathToLocalStorage);
Log.e("file", audioDirectory.getAbsolutePath());
InputStream inputStream = null;
OutputStream outputStream = null;
try {
byte[] fileReader = new byte[4096];
long fileSize = body.contentLength();
long fileSizeDownloaded = 0;
inputStream = body.byteStream();
outputStream = new FileOutputStream(audioDirectory);
while (true) {
int read = inputStream.read(fileReader);
if (read == -1) {
break;
}
outputStream.write(fileReader, 0, read);
fileSizeDownloaded += read;
Log.e(TAG, "file download: " + fileSizeDownloaded + " of " + fileSize);
}
outputStream.flush();
Log.e("music","music downloaded : "+ audioDirectory.getAbsolutePath());
}
}
return false;
} 

Answer 1

您的方法是正确的，您将按预期下载多个mp3文件。