How can I download documents or files in webview

Question

Here is the new updated code but still give me the error "Unauthorized.You do not have permission for this action" I want to know why this error thanks. I have implemented the recommended answers still didnt work.

public class TipsActivity extends AppCompatActivity {
    private WebView mWebView;
    private static final int REQUEST_CODE_PERMISSION = 2;
    private static String[] PERMISSIONS_REQ = {
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };
    private static boolean verifyPermissions(Activity activity) {
        // Check if we have write permission
        int WritePermision = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (WritePermision != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    activity,
                    PERMISSIONS_REQ,
                    REQUEST_CODE_PERMISSION
            );
            return false;
        } else {
            return true;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tips);
        mWebView = (WebView) findViewById(R.id.webView7);
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        mWebView.setWebChromeClient(new WebChromeClient());
        mWebView.loadUrl("http://www.example.com");
        mWebView.setWebViewClient(new WebViewClient());
        mWebView.setDownloadListener(new DownloadListener() {

            @Override
            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimeType,
                                        long contentLength) {
                if (verifyPermissions(TipsActivity.this)) {
                    DownloadManager.Request request = new DownloadManager.Request(
                            Uri.parse(url));
                    request.setMimeType(mimeType);
                    String cookies = CookieManager.getInstance().getCookie(url);
                    request.addRequestHeader("cookie", cookies);
                    request.addRequestHeader("User-Agent", userAgent);
                    request.setDescription("Downloading file...");
                    request.setTitle(URLUtil.guessFileName(url, contentDisposition,
                            mimeType));
                    request.allowScanningByMediaScanner();
                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                    request.setDestinationInExternalPublicDir(
                            Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
                                    url, contentDisposition, mimeType));
                    DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                    dm.enqueue(request);
                    Toast.makeText(getApplicationContext(), "Downloading File",
                            Toast.LENGTH_LONG).show();
                } else {
//prompt user for permission
                }

            }
        });
    }


    @Override
    public void onBackPressed() {
        if (mWebView.canGoBack()) {
            mWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }

    }

Here is the new updated code but still give me the error "Unauthorized.You do not have permission for this action" I want to know why this error thanks. I have implemented the recommended answers still didnt work.

Rizwan Atta · Answer 1 · 2018-01-22T20:46:10.707

NOTE! add permission of writing external storage in manifest and also take runtime permission from user for post lolipop api devices

for runtime persmission check this Document Link

in your activity declare this first as field (GLOBAL VARIABLE)

private static final int REQUEST_CODE_PERMISSION = 2;
    private static String[] PERMISSIONS_REQ = {
           Manifest.permission.WRITE_EXTERNAL_STORAGE
    };
private static boolean verifyPermissions(Activity activity) {
        // Check if we have write permission
        int WritePermision = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (WritePermision != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    activity,
                    PERMISSIONS_REQ,
                    REQUEST_CODE_PERMISSION
            );
            return false;
        } else {
            return true;
        }
    }

Use the above method in your download manager somewhat like this

 mwebView.setDownloadListener(new DownloadListener()
       {

      @Override  
       public void onDownloadStart(String url, String userAgent,
            String contentDisposition, String mimeType,
            long contentLength) {
if(verifyPermissions(yourActivity.this)){
DownloadManager.Request request = new DownloadManager.Request(
                Uri.parse(url));
        request.setMimeType(mimeType);
        String cookies = CookieManager.getInstance().getCookie(url);
        request.addRequestHeader("cookie", cookies);
        request.addRequestHeader("User-Agent", userAgent);
        request.setDescription("Downloading file...");
        request.setTitle(URLUtil.guessFileName(url, contentDisposition,
                mimeType));
        request.allowScanningByMediaScanner(); request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(
                Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
                        url, contentDisposition, mimeType));
        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        dm.enqueue(request);
        Toast.makeText(getApplicationContext(), "Downloading File",
                Toast.LENGTH_LONG).show();
}else{
//prompt user for permission
}

    }});

for more check this

It gave me an error saying "You do not have permission for this action" and in my android manifest file I have — user333210, Jan 22 '18 at 20:00
you should use runtime permission check its required for post lollipop Api . pre lollipop api never required permission for user sensitive operations like read or write external storage. but now it has to be coded check this https://developer.android.com/training/permissions/index.html — Rizwan Atta, Jan 22 '18 at 20:22
@user333210 Please do not edit answers to change their code. Edit your question if you have new code to share. — TylerH, Jan 22 '18 at 22:45

score 0 · Answer 2 · answered Jan 22 '18 at 19:29

0

You can try -

mWebView.setDownloadListener(new DownloadListener() {
    public void onDownloadStart(String url, String userAgent,
                String contentDisposition, String mimetype,
                long contentLength) {
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);
    }
});

answered Jan 22 '18 at 19:29

theboringdeveloper

1,429
13
17

It gave me an error saying "You do not have permission for this action" and in my android manifest file I have – user333210 Jan 22 '18 at 20:22
Which api level are you testing at? – theboringdeveloper Jan 22 '18 at 20:23
android version is Oreo – user333210 Jan 22 '18 at 20:25
Api level 23 and above you need to ask for permission at run time – theboringdeveloper Jan 22 '18 at 20:26
How can I implement it to my code , im new to this – user333210 Jan 22 '18 at 20:27
https://developer.android.com/training/permissions/requesting.html – theboringdeveloper Jan 22 '18 at 20:28
If you go to your phone settings and goto applications and then select you application,in the permissions sections you can see if they are enabled or not – theboringdeveloper Jan 22 '18 at 20:29
https://stackoverflow.com/questions/33666071/android-marshmallow-request-permission – theboringdeveloper Jan 22 '18 at 20:30
Still does not work – user333210 Jan 22 '18 at 20:42

How can I download documents or files in webview

2 Answers2

Linked