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 Enable Download Button in WebView Android App - Android Studio WebView

Source Code

#AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

///////////////////////////////////////////////////////////
#activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <WebView
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
        
</androidx.constraintlayout.widget.ConstraintLayout>

///////////////////////////////////////////////////////////
#MainActivity.class

public class MainActivity extends AppCompatActivity {

    WebView webview;
    WebSettings websettings;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            if (checkSelfPermission(WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED){
                String[] permissions = {WRITE_EXTERNAL_STORAGE};
                requestPermissions(permissions,1);
            }
        }
        
        webview = findViewById(R.id.webview);

        websettings = webview.getSettings();
        websettings.setBuiltInZoomControls(false);
        websettings.setDisplayZoomControls(false);
        websettings.setJavaScriptEnabled(true);

        webview.setWebViewClient(new WebViewClient());
        webview.loadUrl("https://www.yalla-mobile.com/");
        
        webview.setDownloadListener(new DownloadListener() {
            @Override
            public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
                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 downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                downloadManager.enqueue(request);
                Toast.makeText(MainActivity.this, "Downloading file...", Toast.LENGTH_SHORT).show();
            }
        });
    }

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

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