How we download File from URL in android

There are many methods to download files from the server.

Use android.permission.WAKE_LOCK AsyncTask
Download From service by adding <service android:name=“.DownloadService”/>
Use DownLoadManager class and many others.

I am discussing with DownLoadManager, it is applied on the GingerBread or above version of applications.

GingerBread brought a new feature, DownloadManager, which allows you to download files easily and delegate the hard work of handling threads, streams, etc. to the system.

 public void downloadPdfFile(final String title){

        AlertDialog.Builder alert = new AlertDialog.Builder(context);
        alert.setNegativeButton(context.getResources().getString(android.R.string.cancel), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                ((Checkout)context).pdfCreater = null;
            }
        });
        alert.setPositiveButton(context.getResources().getString(android.R.string.ok), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                try {
                    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(Html.fromHtml(mUrl) + ""));
                    request.setTitle(title);
                    // 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.setDestinationInExternalFilesDir(context,Environment.DIRECTORY_DOWNLOADS, "ALSupermarket");
                    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
                    // // get download service and enqueue file
                   manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
                    long index = manager.enqueue(request);
                    context.registerReceiver(receiver_complete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

//                    manager.openDownloadedFile(index);
//                    uri = manager.getUriForDownloadedFile(index);
//                    Log.d("downloading url = ", uri.toString());

                } catch (Exception e) {
                    e.printStackTrace();
                }
                if(title.equalsIgnoreCase("ALSupermarket"))
                Toast.makeText(context, R.string.download_started_popup,
                        Toast.LENGTH_SHORT).show();
                else {
                    Toast.makeText(context, R.string.shareing_start_popup,
                            Toast.LENGTH_SHORT).show();
                }

            }
        });
        alert.setCancelable(false);       
        alert.setMessage(Html.fromHtml(context.getString(R.string.ask_for_download))).show();        
    }

public void downloadPdfFile(final String title){

AlertDialog.Builder alert = new AlertDialog.Builder(context);

alert.setNegativeButton(context.getResources().getString(android.R.string.cancel), new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

dialog.dismiss();

((Checkout)context).pdfCreater = null;

}

});

alert.setPositiveButton(context.getResources().getString(android.R.string.ok), new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

try {

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(Html.fromHtml(mUrl) + ""));

request.setTitle(title);

// 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.setDestinationInExternalFilesDir(context,Environment.DIRECTORY_DOWNLOADS, "ALSupermarket");

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);

// // get download service and enqueue file

manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

long index = manager.enqueue(request);

context.registerReceiver(receiver_complete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

// manager.openDownloadedFile(index);

// uri = manager.getUriForDownloadedFile(index);

// Log.d("downloading url = ", uri.toString());

} catch (Exception e) {

e.printStackTrace();

}

if(title.equalsIgnoreCase("ALSupermarket"))

Toast.makeText(context, R.string.download_started_popup,

Toast.LENGTH_SHORT).show();

else {

Toast.makeText(context, R.string.shareing_start_popup,

Toast.LENGTH_SHORT).show();

}

});

alert.setCancelable(false);

alert.setMessage(Html.fromHtml(context.getString(R.string.ask_for_download))).show();

}

Find alert message when File has downloaded-

 BroadcastReceiver receiver_complete = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)){
                Bundle extras = intent.getExtras();
                DownloadManager.Query q = new DownloadManager.Query();
                q.setFilterById(extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID));
                Cursor c = manager.query(q);

                if (c.moveToFirst()) {
                    int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
                    if (status == DownloadManager.STATUS_SUCCESSFUL) {
                        // process download
                        if(c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE)).equalsIgnoreCase("View"))
                            viewPdf();
                        else if(c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE)).equalsIgnoreCase("Share"))
                            shareFile();
                        // get other required data by changing the constant passed to getColumnIndex
                    }else{
                        Toast.makeText(context, R.string.error_creating_pdf_file,
                                Toast.LENGTH_SHORT).show();
                    }
                }
            }
        }
    };

BroadcastReceiver receiver_complete = new BroadcastReceiver(){

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)){

Bundle extras = intent.getExtras();

DownloadManager.Query q = new DownloadManager.Query();

q.setFilterById(extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID));

Cursor c = manager.query(q);

if (c.moveToFirst()) {

int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));

if (status == DownloadManager.STATUS_SUCCESSFUL) {

// process download

if(c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE)).equalsIgnoreCase("View"))

viewPdf();

else if(c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE)).equalsIgnoreCase("Share"))

shareFile();

// get other required data by changing the constant passed to getColumnIndex

}else{

Toast.makeText(context, R.string.error_creating_pdf_file,

Toast.LENGTH_SHORT).show();

}

};

Reference: http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog

ashwini gupta 22 April 2017

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