How to download Webview files from the Sdcard if available

Question

The App is a simple browser that works like Webview. This code makes the files to be downloaded into a custom folder and works perfectly.

mWebView.setDownloadListener(new DownloadListener() {

            @SuppressLint("InlinedApi") public void onDownloadStart(String url, String userAgent,
                                                                    String contentDisposition, String mimetype,
                                                                    long contentLength) {
                DownloadManager.Request request = new DownloadManager.Request(
                        Uri.parse(url));

                request.allowScanningByMediaScanner();
                final String filename = URLUtil.guessFileName(url, contentDisposition, mimetype);
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
                //request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
                request.setDestinationInExternalPublicDir("/Nome da Pasta", filename);
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT); //This is important!
                intent.addCategory(Intent.CATEGORY_OPENABLE); //CATEGORY.OPENABLE
                intent.setType("*/*");//any application,any extension
                Toast.makeText(getApplicationContext(), "Baixando", //To notify the Client that the file is being downloaded
                        Toast.LENGTH_LONG).show();

            }
        });

The problem is they’re going for the cell phone memory. If your phone has a Sdcard inserted, how do I get the files to be downloaded directly to Sdcard?

Answer 1

You are wearing request.setDestinationInExternalPublicDir() which, as the name implies would be external memory.
The problem may be that newer devices may have more than one type of external memory. Besides the Sdcard, they may have some internal (fixed) considered as external.

The fact that minSdk is 9 limits somewhat the way of obtaining, with a guarantee, the path for Sdcard, so I do not guarantee that the following method works in all cases.^(*)

public Uri getSDCardPathIfAvailable(){

    //Se o "primary external path" é um SDCard retorna-o
    if(Environment.isExternalStorageRemovable()) {
        return Uri.fromFile(getExternalFilesDir(null));
    }
    //Ler todos os "external paths"(não garanto se Android < 19)
    File[] externalDirs =  ContextCompat.getExternalFilesDirs(this, null);

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        for(File externalDir : externalDirs){
            if(Environment.isExternalStorageRemovable(externalDir)){
                return Uri.fromFile(externalDir);
            }
        }
        return null;
    }

    //Não podendo fazer melhor, talvez, com sorte, o segundo seja o SDCard
    else if(externalDirs.length > 1 && externalDirs[1] != null){
        return Uri.fromFile(externalDirs[1]);
    }
    return null;
}

Place this method in your class and replace the line

request.setDestinationInExternalPublicDir("/Nome da Pasta", filename);

for

Uri uri = getSDCardPathIfAvailable();
if(uri != null){
    request.setDestinationUri(uri.buildUpon().appendPath(filename).build());
}else{
    //Não foi encontrado um SDCard(mas pode existir)
}

^(*)_{Samsung Galaxy Tab2(4.1.2), which has more than one "external memory" (fixed + Sdcard), ContextCompat.getExternalFilesDirs() returned only the fixed. In the Samsung Galaxy Tab3(4.4.2) returned the two.
If the methods ContextCompat.getExternalFilesDirs() and Environment.isExternalStorageRemovable(File externalDir) do what is said in the documentation the method will work in version 21 or later.}