Convert mime types in fileChooserParams to the right format for Intent.setType

Question

I am trying to upload a file using a WebView in Android.

This is the code in use:

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean o         


        

Answer 1

I resolved simply adding the following 2 lines in my PR:

intent.setType("image/*");
intent.putExtra(Intent.EXTRA_MIME_TYPES, fileChooserParams.getAcceptTypes());

Outcome:

2019-04-01 00:18:00.501 32500-32500/my.app.bundle.id D/SystemWebChromeClient: : fileChooserParams.getAcceptTypes(): [.jpg,.png,.tiff,.jpeg,.tif,.pdf]

2019-04-01 00:18:00.503 2225-2921/system_process I/ActivityManager: START u0 {act=android.intent.action.GET_CONTENT cat=[android.intent.category.OPENABLE] typ=image/* cmp=com.android.documentsui/.picker.PickActivity (has extras)} from uid 10105

I hope it will get accepted.

Answer 2

I improved the solution using this code:

   // Validation utility for mime types
    private List<String> extractValidMimeTypes(String[] mimeTypes) {
        List<String> results = new ArrayList<String>();
        List<String> mimes;
        if (mimeTypes.length() == 1 && mimeTypes[0].contains(",")) {
            mimes = Arrays.asList(mimeTypes[0].split(","));
        } else {
            mimes = Arrays.asList(mimeTypes);
        }
        MimeTypeMap mtm = MimeTypeMap.getSingleton();
        for (String mime : mimes) {
            if (mime != null && mime.trim().startsWith(".")) {
                String extensionWithoutDot = mime.trim().substring(1, mime.trim().length());
                String derivedMime = mtm.getMimeTypeFromExtension(extensionWithoutDot);
                if (derivedMime != null && !results.contains(derivedMime)) {
                    // adds valid mime type derived from the file extension
                    results.add(derivedMime);
                }
            } else if (mtm.getExtensionFromMimeType(mime) != null && !results.contains(mime)) {
                // adds valid mime type checked agains file extensions mappings
                results.add(mime);
            }
        }
        return results;
    }


public boolean onShowFileChooser(WebView webView, final ValueCallback<Uri[]> filePathsCallback, final WebChromeClient.FileChooserParams fileChooserParams) {
    Intent intent = fileChooserParams.createIntent();
    List<String> validMimeTypes = extractValidMimeTypes(fileChooserParams.getAcceptTypes());
    if (validMimeTypes.isEmpty()) {
        intent.setType(DEFAULT_MIME_TYPE);
    } else {
        intent.setType(String.join(" ", validMimeTypes));
    }
    ...

See my Pull Request for more details.