MainActivity.java: uses or overrides a deprecated API

Question

I get a compilation error after I add implementation 'com.google.firebase:firebase-inappmessaging-display:19.0.2' under dependencies in build.grandle app. It's working fine when the project is syncing, but it fails while I try to compile the app.

This is the error I've got:

AndroidStudioProjects/Pari365/app/src/main/java/com/maunexus/MainActivity.java:
uses or overrides a deprecated API.
Recompile with -Xlint:deprecation for details.

This is the MainActivity.java file:

package com.maunexus;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.webkit.CookieManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {

    private WebView webView;
    Activity activity;
    private ProgressDialog progDailog;


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

        activity = this;

        progDailog = ProgressDialog.show(activity, "Loading", "Please wait...", true);
        progDailog.setCancelable(false);


        webView = (WebView) findViewById(R.id.webviewid);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true);
        }
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
        webView.getSettings().setSupportMultipleWindows(false);
        webView.getSettings().setSupportZoom(false);
        webView.setVerticalScrollBarEnabled(false);
        webView.setHorizontalScrollBarEnabled(false);
        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setUseWideViewPort(true);
        webView.setWebViewClient(new WebViewClient() {

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                progDailog.show();
                view.loadUrl(url);

                return true;
            }

            @Override
            public void onPageFinished(WebView view, final String url) {
                progDailog.dismiss();
            }
        });

        webView.loadUrl("https://pari365.mg");

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.super_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }


    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_back:
                onBackPressed();
                break;

            case R.id.menu_forward:
                onForwardPressed();
                break;

            case R.id.menu_refresh:
                webView.reload();
                Toast.makeText(this, "Reloading... Please Wait!", Toast.LENGTH_SHORT).show();
                break;


        }
        return super.onOptionsItemSelected(item);
    }


    private void onForwardPressed() {
        if (webView.canGoForward()) {
            webView.goForward();
        } else {
            Toast.makeText(this, "Already there! ;)", Toast.LENGTH_SHORT).show();
        }
    }

    public void onBackPressed() {
        if (webView.canGoBack()) {
            webView.goBack();
        }
    }
}

And, this is the AndroidManifest.xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.maunexus">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Please help me to fix the error. Thank You ;)

UPDATE: I replaced the ProgressDialog with ProgressBar, but the error still persists.

com/maunexus/MainActivity.java  
uses or overrides a deprecated API. 
com.android.tools.r8.CompilationFailedException: Compilation failed to complete 
com.android.tools.r8.utils.AbortException: Error: null, Cannot fit requested classes in a single dex file (# methods: 100707 > 65536)   
null    
Cannot fit requested classes in a single dex file (# methods: 100707 > 65536)   

Answer 1

This is a warning, and the deprecated class is ProgressDialog, from the docs:

This class was deprecated in API level 26.

ProgressDialog is a modal dialog, which prevents the user from interacting with the app. Instead of using this class, you should use a progress indicator like ProgressBar, which can be embedded in your app's UI. Alternatively, you can use a notification to inform the user of the task's progress.

https://developer.android.com/reference/android/app/ProgressDialog

You can use the ProgressBar instead of ProgressDialog.