Die Anleitung zu Android TimePickerDialog

boolean is24HView = true;
int selectedHour = 10;
int selectedMinute = 20;

// Time Set Listener.
TimePickerDialog.OnTimeSetListener timeSetListener = new TimePickerDialog.OnTimeSetListener() {

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        editTextTime.setText(hourOfDay + ":" + minute );
        lastSelectedHour = hourOfDay;
        lastSelectedMinute = minute;
    }
};

// Create TimePickerDialog:
TimePickerDialog timePickerDialog = new TimePickerDialog(this,
                        timeSetListener, lastSelectedHour, lastSelectedMinute, is24HView);

// Show
timePickerDialog.show();

boolean is24HView = true;
int selectedHour = 10;
int selectedMinute = 20;

// Time Set Listener.
TimePickerDialog.OnTimeSetListener timeSetListener = new TimePickerDialog.OnTimeSetListener() {

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        editTextTime.setText(hourOfDay + ":" + minute );
        lastSelectedHour = hourOfDay;
        lastSelectedMinute = minute;
    }
};

// Create TimePickerDialog:
TimePickerDialog timePickerDialog = new TimePickerDialog(this,
                        android.R.style.Theme_Holo_Light_Dialog_NoActionBar,
                        timeSetListener, lastSelectedHour, lastSelectedMinute, is24HView);

// Show
timePickerDialog.show();

<?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">

    <EditText
        android:id="@+id/editText_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="90dp"
        android:ems="10"
        android:inputType="time"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="90dp"
        android:text="Select Time"
        app:layout_constraintStart_toEndOf="@+id/editText_time"
        app:layout_constraintTop_toTopOf="parent" />

    <CheckBox
        android:id="@+id/checkBox_isSpinnerMode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="Spinner Mode?"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_time" />

    <CheckBox
        android:id="@+id/checkBox_is24HView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="Display TimePickerDialog in 24H mode?"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/checkBox_isSpinnerMode" />

</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.timepickerdialogexample;

import androidx.appcompat.app.AppCompatActivity;

import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TimePicker;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

    private EditText editTextTime;
    private Button buttonTime;
    private CheckBox checkBoxIsSpinnerMode;
    private CheckBox checkBoxIs24HView;

    private int lastSelectedHour = -1;
    private int lastSelectedMinute = -1;

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

        this.editTextTime = (EditText) this.findViewById(R.id.editText_time);
        this.buttonTime = (Button) this.findViewById(R.id.button_time);
        this.checkBoxIsSpinnerMode = (CheckBox) this.findViewById(R.id.checkBox_isSpinnerMode);
        this.checkBoxIs24HView = (CheckBox) this.findViewById(R.id.checkBox_is24HView);

        this.buttonTime.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                buttonSelectTime();
            }
        });
    }


    private void buttonSelectTime()  {
        if(this.lastSelectedHour == -1)  {
            // Get Current Time
            final Calendar c = Calendar.getInstance();
            this.lastSelectedHour = c.get(Calendar.HOUR_OF_DAY);
            this.lastSelectedMinute = c.get(Calendar.MINUTE);
        }
        final boolean is24HView = this.checkBoxIs24HView.isChecked();
        final boolean isSpinnerMode = this.checkBoxIsSpinnerMode.isChecked();

        // Time Set Listener.
        TimePickerDialog.OnTimeSetListener timeSetListener = new TimePickerDialog.OnTimeSetListener() {

            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                editTextTime.setText(hourOfDay + ":" + minute );
                lastSelectedHour = hourOfDay;
                lastSelectedMinute = minute;
            }
        };

        // Create TimePickerDialog:
        TimePickerDialog timePickerDialog = null;

        // TimePicker in Spinner Mode:
        if(isSpinnerMode)  {
            timePickerDialog = new TimePickerDialog(this,
                    android.R.style.Theme_Holo_Light_Dialog_NoActionBar,
                    timeSetListener, lastSelectedHour, lastSelectedMinute, is24HView);
        }
        // TimePicker in Clock Mode (Default):
        else  {
            timePickerDialog = new TimePickerDialog(this,
                    timeSetListener, lastSelectedHour, lastSelectedMinute, is24HView);
        }

        // Show
        timePickerDialog.show();
    }

}