alarm android example

different files

AndroidManifest.xml:

...
<uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
...

==============================================================================================

MainActivity.java:

package com.sunmeat.alarm;

import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

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

        TimePicker timePicker = findViewById(R.id.timePicker);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            timePicker.setIs24HourView(true);
        }
        Button setAlarmButton = findViewById(R.id.setAlarmButton);

        Calendar currentTime = Calendar.getInstance();
        currentTime.add(Calendar.MINUTE, 1);

        timePicker.setHour(currentTime.get(Calendar.HOUR_OF_DAY));
        timePicker.setMinute(currentTime.get(Calendar.MINUTE));

        setAlarmButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int hour = timePicker.getHour();
                int minute = timePicker.getMinute();

                setAlarm(hour, minute);
            }
        });
    }

    private void setAlarm(int hour, int minute) {
        Intent intent = new Intent(android.provider.AlarmClock.ACTION_SET_ALARM)
                .putExtra(android.provider.AlarmClock.EXTRA_HOUR, hour)
                .putExtra(android.provider.AlarmClock.EXTRA_MINUTES, minute)
                .putExtra(android.provider.AlarmClock.EXTRA_MESSAGE, "Пора делать ДЗ!")
                .putExtra(android.provider.AlarmClock.EXTRA_SKIP_UI, true);

        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }
}

==============================================================================================

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity">

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true" />

    <Button
        android:id="@+id/setAlarmButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/timePicker"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:text="Установить будильник" />

</RelativeLayout>