Download support (Acode-Foundation#1263)

* feat. implement downloading support

* feat. ask before downloading

Author: RohitKushvaha01

src/plugins/browser/android/com/foxdebug/browser/Browser.java

@@ -38,6 +38,17 @@
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
+import android.app.AlertDialog;
+import android.app.DownloadManager;
+import android.content.Context;
+import android.net.Uri;
+import android.os.Environment;
+import android.webkit.DownloadListener;
+import android.webkit.URLUtil;
+import android.webkit.WebView;
+import android.widget.Toast;
+
+
 
 public class Browser extends LinearLayout {
 
@@ -143,6 +154,40 @@ public void onClick(View v) {
     webView.setFocusable(true);
     webView.setFocusableInTouchMode(true);
     webView.setBackgroundColor(0xFFFFFFFF);
+
+
+    webView.setDownloadListener(new DownloadListener() {
+        @Override
+        public void onDownloadStart(String url, String userAgent,
+                                    String contentDisposition, String mimeType,
+                                    long contentLength) {
+
+            String fileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
+
+            new AlertDialog.Builder(getContext())
+                .setTitle("Download file")
+                .setMessage("Do you want to download \"" + fileName + "\"?")
+                .setPositiveButton("Yes", (dialog, which) -> {
+                    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
+                    request.setMimeType(mimeType);
+                    request.addRequestHeader("User-Agent", userAgent);
+                    request.setDescription("Downloading file...");
+                    request.setTitle(fileName);
+                    request.allowScanningByMediaScanner();
+                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+                    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
+
+                    DownloadManager dm = (DownloadManager) getContext().getSystemService(Context.DOWNLOAD_SERVICE);
+                    dm.enqueue(request);
+
+                    Toast.makeText(getContext(), "Download started...", Toast.LENGTH_SHORT).show();
+                })
+                .setNegativeButton("Cancel", null)
+                .show();
+        }
+    });
+
+
     fitWebViewTo(0, 0, 1);
 
     webView.setWebChromeClient(new BrowserChromeClient(this));