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

package com.tiledesk.tiledeskwidgetintegrationexample;
​
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
​
import android.os.Bundle;
​
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.util.Log;
import android.webkit.ConsoleMessage;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.Toast;
​
public class TiledeskActivity extends AppCompatActivity {
​
​
    public static final int REQUEST_SELECT_FILE = 100;
    public ValueCallback<Uri[]> uploadMessage;
​
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tiledesk);
​
        WebView myWebView = (WebView) findViewById(R.id.tiledesk);
​
​
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
​
​
        myWebView.setWebChromeClient(new FileChooserWebChromeClient(this) {
            @Override
            public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
                Log.d("TiledeskActivity", consoleMessage.message() + " -- From line "
                        + consoleMessage.lineNumber() + " of "
                        + consoleMessage.sourceId());
                return super.onConsoleMessage(consoleMessage);
            }
        });
​
//        allow to snap photos
        webSettings.setAllowFileAccess(true);
​
        webSettings.setDomStorageEnabled(true);
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
​
        myWebView.loadUrl("https://widget.tiledesk.com/v4/assets/twp/index.html?isOpen=true&tiledesk_projectid=<CHANGE_IT>&tiledesk_fullscreenMode=true&tiledesk_hideHeaderCloseButton=true&tiledesk_isopen=true");
​
    }
​
​
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_SELECT_FILE) {
            if (uploadMessage == null) return;
            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
            uploadMessage = null;
        }
    }
​
​
    public class FileChooserWebChromeClient extends WebChromeClient {
​
        private Activity myActivity;
​
        public FileChooserWebChromeClient(TiledeskActivity myActivity) {
            this.myActivity = myActivity;
        }
​
        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
            uploadMessage = filePathCallback;
​
            Intent intent = fileChooserParams.createIntent();
            try {
                myActivity.startActivityForResult(intent, REQUEST_SELECT_FILE);
            } catch (ActivityNotFoundException e) {
                Toast.makeText(myActivity, "Cannot open file chooser", Toast.LENGTH_LONG).show();
                return false;
            }
​
            return true;
        }
    }
​
}

<?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=".TiledeskActivity">
​
    <WebView
        android:id="@+id/tiledesk"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
​
</androidx.constraintlayout.widget.ConstraintLayout>