同步下载文件（Android）

Question

我有一系列Urls，我会同步。 事实上，我正在使用for循环进行asynctask。 我尝试使用downloadmanager和广播接收器没有成功（管理器使用另一个线程，所以我不能每次取消注册，泄漏附加）。

这是我的Asynctask：

    package com.ylly.hypred.splashScreen.asynctask;

import android.app.DownloadManager;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.util.Log;
import android.view.WindowManager;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.ylly.hypred.R;
import com.ylly.hypred.api.CallAPI;
import com.ylly.hypred.api.model.MediaAPIModel;
import com.ylly.hypred.api.model.MediaArrayAPIModel;
import com.ylly.hypred.utils.FileManager;

import java.io.File;
import java.util.ArrayList;

/**
 * Created by YLLY on 17-11-2015.
 */
public class LoadMedias extends AsyncTask<String, Void, String> {
    private MediaArrayAPIModel mediaAPIModels;
    private Context context;
    private ProgressDialog progressDialog;
    private boolean isCallFromUpdate;
    private final String TAG = "LoadMedias";
    private OnLoadingIsFinished mCallback;

    /**
     *
     */
    public interface OnLoadingIsFinished {
        void callProcess();
    }

    /**
     *
     * @param context
     * @param urls
     * @param isCallFromUpdate
     */
    public LoadMedias(Context context, MediaArrayAPIModel urls, boolean isCallFromUpdate) {
        this.context = context;
        this.mediaAPIModels = urls;
        progressDialog = new ProgressDialog(context);
        this.isCallFromUpdate = isCallFromUpdate;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        if (!isCallFromUpdate)
            progressDialog.setTitle(context.getString(R.string.fm_etape_trois_sur_trois));

        progressDialog.setMessage(context.getString(R.string.fm_enregistrement));
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setIndeterminate(false);
        progressDialog.setCancelable(false);
        progressDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
        progressDialog.setMax(mediaAPIModels.getMediaImagePIModels().size() + mediaAPIModels.getMediaFileAPIModels().size());
        progressDialog.setProgress(0);
        progressDialog.show();
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
        mCallback.callProcess();
    }

    @Override
    protected String doInBackground(String... arg0) {
        try {
            loadMediaImages(mediaAPIModels.getMediaImagePIModels(), progressDialog);
            loadMediaFiles(context, mediaAPIModels.getMediaFileAPIModels(), progressDialog);
        } catch (Exception e) {
            Log.d(TAG, e.toString());
        }
        return "";
    }

    /**
     *
     * @param onLoadingIsFinished
     */
    public void setOnLoadingIsFinished(OnLoadingIsFinished onLoadingIsFinished) {
        this.mCallback = onLoadingIsFinished;
    }

    /**
     * @param mediaAPIModels
     * @param progressDialog
     */
    private void loadMediaImages(ArrayList<MediaAPIModel> mediaAPIModels, ProgressDialog progressDialog) {
        String type;
        for (int i = 0; i < mediaAPIModels.size(); i++) {
            type = mediaAPIModels.get(i).getUrl().substring(mediaAPIModels.get(i).getUrl().lastIndexOf("."));
            if (type.equals(".png") || type.equals(".jpg") || type.equals(".jpeg")) {
                ImageLoader.getInstance().loadImageSync(CallAPI.mBaseUrl + mediaAPIModels.get(i).getUrl());
                i++;
                progressDialog.setProgress(progressDialog.getProgress() + 1);
            }
        }
    }

    /**
     * @param context
     * @param mediaAPIModels
     * @param progressDialog
     */
    private void loadMediaFiles(Context context, ArrayList<MediaAPIModel> mediaAPIModels, final ProgressDialog progressDialog) {
        {
            String name;
            String mime;
            for (int i = 0; i < mediaAPIModels.size(); i++) {
                if (!FileManager.getInstance().getFileFromLocal(context, mediaAPIModels.get(i).getUrl(), false)) {
                    name = mediaAPIModels.get(i).getUrl().substring(mediaAPIModels.get(i).getUrl().lastIndexOf("/") + 1); //on sépare le nom du fichier du reste de l'url
                    mime = name.substring(name.lastIndexOf(".")); //on recupere l'extension du fichier

                    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(CallAPI.mBaseUrl + mediaAPIModels.get(i).getUrl()));
                    request.setDescription(context.getResources().getString(R.string.downloading) + " name");
                    request.setTitle(context.getResources().getString(R.string.app_name));
                    request.setMimeType(mime);
                    // in order for this if to run, you must use the android 3.2 to compile your app
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                        request.allowScanningByMediaScanner();
                        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                    }

                    request.setDestinationInExternalPublicDir("test" + File.separatorChar + "doc", name);

                    // get download service and enqueue file
                    DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

                    context.registerReceiver(new BroadcastReceiver() {
                        @Override
                        public void onReceive(Context context, Intent intent) {
                            context.unregisterReceiver(this);
                            Log.d("DOWNLOAD", "unregister");
                            progressDialog.setProgress(progressDialog.getProgress() + 1);
                        }
                    }, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
                } else {
                    i++;
                    progressDialog.setProgress(progressDialog.getProgress() + 1);
                }
            }
        }
    }
}

缓存加载有效。

提前致谢;）