How to display progress dialog before starting an activity in Android ?

•     Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:padding="4dp"
   tools:context=".MainActivity">
   <TextView
      android:layout_marginTop="30dp"
      android:text="Showing Progress dialog before starting the activity in Android.."
      android:textStyle="bold"
      android:textSize="24sp"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"/>
</LinearLayout>

•     Add the following code to src/MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
   ProgressDialog progressDialog;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      progressDialog = new ProgressDialog(this);
      progressDialog.setTitle("Content Loader");
      progressDialog.setProgress(10);
      progressDialog.setMax(100);
      progressDialog.setMessage("Loading...");
      new MyTask().execute();
   }
   public class MyTask extends AsyncTask<Void, Void, Void> {
      public void onPreExecute() {
         progressDialog.show();
      }
      public Void doInBackground(Void... unused) {
         return null;
      }
   }
}

•     Add the following code to androidManifest.xml

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

OutPut