Google File Async Download

DownloadTask.java

package biz.riopapa.jigsawpuzzle.func;

import static biz.riopapa.jigsawpuzzle.ActivityMain.downloadFileName;
import static biz.riopapa.jigsawpuzzle.ActivityMain.downloadPosition;
import static biz.riopapa.jigsawpuzzle.ActivityMain.downloadSize;
import static biz.riopapa.jigsawpuzzle.ActivityMain.imageSelAdapter;
import static biz.riopapa.jigsawpuzzle.ActivityMain.jigFiles;
import static biz.riopapa.jigsawpuzzle.ActivityMain.jpgFolder;
import static biz.riopapa.jigsawpuzzle.ActivityMain.mActivity;
import static biz.riopapa.jigsawpuzzle.ActivityMain.mContext;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import biz.riopapa.jigsawpuzzle.DownloadCompleteListener;
import biz.riopapa.jigsawpuzzle.model.JigFile;

public class DownloadTask extends AsyncTask<String, Integer, Long> {

private static final String TAG = "DownloadTask";
private DownloadCompleteListener listener;
private final String url;
private final String fileName;
private final String dir;

private final String imageHead = "https://drive.google.com/uc?export=download&id=";

private final String imageDir = "image";
private final String thumbnailDir = "thumbnail";
public DownloadTask(DownloadCompleteListener listener, String fileId, String dir, String fileName) {
this.listener = listener;
this.url = imageHead + fileId;
this.dir = dir;
this.fileName = fileName;
}

@Override
protected Long doInBackground(String... urls) {
long downSize = 0;

try {
URL url = new URL(this.url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();

BufferedInputStream inputStream = new BufferedInputStream(connection.getInputStream());

File mydir = mContext.getDir(dir, Context.MODE_PRIVATE); //Creating an internal dir;
File fileWithinMyDir = new File(mydir, fileName); //Getting a file within the dir.
FileOutputStream out = new FileOutputStream(fileWithinMyDir);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
downloadSize += bytesRead;
}

out.flush();
out.close();
inputStream.close();
connection.disconnect();
Log.w("connection","disconnected "+fileName);
} catch (Exception e) {
Log.e(TAG, "Error downloading file: " + e.getMessage());
}

downloadSize = downSize;
return downSize;
}

@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);

// progressBar.setProgress(progress[0]);
}

@Override
protected void onPostExecute(Long result) {
super.onPostExecute(result);
if (fileName.endsWith(".jpg")) {
// if jpg file downloaded, update to jigFiles.thumbnailMap;
Log.w("postDownload", fileName + "jpgFiles="+jigFiles.size());
Bitmap jigImage = FileIO.getJPGFile(mContext, jpgFolder, fileName);
assert jigImage != null;
Bitmap thumb = Bitmap.createScaledBitmap(jigImage,
(int) (jigImage.getWidth()/4f), (int) (jigImage.getHeight()/4f), true);
JigFile jf = jigFiles.get(downloadPosition);
jf.thumbnailMap = FileIO.bitmap2string(thumb);

jigFiles.set(downloadPosition, jf);
imageSelAdapter.notifyItemChanged(downloadPosition);
downloadFileName = null;
}

if (listener != null) {
listener.onDownloadComplete(); // Notify MainActivity about download completion
}

//
// if (result == -1) {
// Toast.makeText(this, "Error downloading file", Toast.LENGTH_SHORT).show();
// } else {
// Toast.makeText(this, "File downloaded successfully", Toast.LENGTH_SHORT).show();
// }
}
}

 

DownloadCompleteListener Interface

package biz.riopapa.jigsawpuzzle;

public interface DownloadCompleteListener {
void onDownloadComplete();
}

 

 

main implement

public class ActivityMain extends Activity implements DownloadCompleteListener {

 

main call

DownloadTask task = new DownloadTask(this, jf.imageId, jpgFolder, downloadFileName);
task.execute();

 

jpgFolder => app_jpgFolder

downloadFileName => a00.jpg

 

main after download completed

 

@Override
public void onDownloadComplete() {

// if download if completed
// downloadFile name = .jpg, downloadPosition > 0 then update thumbnail
// downloadFile name =
if (downloadPosition > 0) // continue to check possible download
   downloadNewJpg();

if (downloadFileName != null && downloadFileName.equals(imageListOnDrive)) {
   String str = FileIO.readTextFile("", imageListOnDrive); // no dir for list
   String[] ss = str.split("\n");
   boolean newlyAdd = false;
   for (int i = 1; i < ss.length; i++) {
      String[] imgInfo = ss[i].split(";");
      String nGame = imgInfo[0].trim();
   }
   if (newlyAdd)
      downloadNewJpg();
   }
}