The below code demonstrate how we can download file from the webview.
permissions required
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
code
public class MainActivity extends AppCompatActivity {
Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext=this;
//find the webView
WebView myWebView = (WebView) findViewById(R.id.myweb);
//Load url in webview
//myWebView.setWebChromeClient(new WebChromeClient()); //--> issue with android pie and above. opens default browser
myWebView.setWebViewClient(new WebViewClient());
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(final String url, final String userAgent, String contentDisposition, String mimetype, long contentLength)
{
//Checking runtime permission for devices above Marshmallow.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
Log.v("SKDINFO","Permission is granted");
downloadDialog(url,userAgent,contentDisposition,mimetype);
} else {
Log.v("SKDINFO","Permission is revoked");
//requesting permissions.
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
}
else {
//Code for devices below API 23 or Marshmallow
Log.v("SKDINFO","Permission is granted");
downloadDialog(url,userAgent,contentDisposition,mimetype);
}
}
});
myWebView.loadUrl("http://www.androidlearner.com");
}
public void downloadDialog(final String url,final String userAgent,String contentDisposition,String mimetype)
{
//getting filename from url.
final String filename = URLUtil.guessFileName(url,contentDisposition,mimetype);
//alertdialog
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
//title of alertdialog
builder.setTitle("Download");
//message of alertdialog
builder.setMessage("Do you want to save " +filename);
//if Yes button clicks.
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//DownloadManager.Request created with url.
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
//cookie
String cookie= CookieManager.getInstance().getCookie(url);
//Add cookie and User-Agent to request
request.addRequestHeader("Cookie",cookie);
request.addRequestHeader("User-Agent",userAgent);
//file scanned by MediaScannar
request.allowScanningByMediaScanner();
//Download is visible and its progress, after completion too.
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
//DownloadManager created
DownloadManager downloadManager=(DownloadManager)getSystemService(DOWNLOAD_SERVICE);
//Saving files in Download folder
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
//download enqued
downloadManager.enqueue(request);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which)
{
//cancel the dialog if Cancel clicks
dialog.cancel();
}
});
//alertdialog shows.
builder.create().show();
}
}
