timePickerDialog=new TimePickerDialog(this,android.R.style.Theme_Holo_Light_Dialog, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker timePicker, int i, int i1) {
                //*Return values
                _editTextTime.setText(i + ":" + i1);
                Toast.makeText(MainActivity.this, "i=" + i + " i1=" + i1, Toast.LENGTH_SHORT).show();

            }
        },hourOfDay,minute,is24HourView);

_timePickerDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
_timePickerDialog.setTitle("Select a Time");
_timePickerDialog.show();

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Dmeo of TimePickerDialog"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editTextTime"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="time" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Select Time"
        tools:layout_editor_absoluteX="151dp"
        tools:layout_editor_absoluteY="266dp"
        android:onClick="onButtonSelectTimeClick"
        />

</LinearLayout>

package com.example.demo_timepicker01;

import androidx.appcompat.app.AppCompatActivity;

import android.app.TimePickerDialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    TimePickerDialog _timePickerDialog;
    EditText _editTextTime;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //--------< onCreate() >--------
        //--< init >--
        //< activity >
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //</ activity >
        _editTextTime=findViewById(R.id.editTextTime);

        _editTextTime.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                open_TimePickerDialog();
            }
        });
        //--</ init >--
    //--------</ onCreate() >--------
    }

    public void onButtonSelectTimeClick(View view) {
        open_TimePickerDialog();
    }


    private void open_TimePickerDialog(){
        //--------< open_TimePickerDialog() >--------
        int hourOfDay=2;
        int minute=2;
        boolean is24HourView=true;

        //Theme_Holo_Light_Dialog
        //Theme_Holo_Light_DarkActionBar  //*Top Position
        _timePickerDialog=new TimePickerDialog(this,android.R.style.Theme_Holo_Light_Dialog, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker timePicker, int i, int i1) {
                //*Return values
                _editTextTime.setText(i + ":" + i1);
                Toast.makeText(MainActivity.this, "i=" + i + " i1=" + i1, Toast.LENGTH_SHORT).show();

            }
        },hourOfDay,minute,is24HourView);
        _timePickerDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        _timePickerDialog.setTitle("Select a Time");
        _timePickerDialog.show();
        //--------</ open_TimePickerDialog() >--------
    }

}