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final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);

DatePickerDialog datePickerDialog = new DatePickerDialog(this,
        new DatePickerDialog.OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year,

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hour = c.get(Calendar.HOUR_OF_DAY);
minute = c.get(Calendar.MINUTE);

TimePickerDialog timePickerDialog = new TimePickerDialog(this,
        new TimePickerDialog.OnTimeSetListener() {

            @Override
            public void onTimeSet(TimePicker view, int hourOfDay,
                                  int minute) {

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// setup the alert builder
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(getString(R.string.notice));
builder.setMessage(getString(R.string.alert_title));

// add the buttons
builder.setPositiveButton(getString(R.string.launch_app), new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialogInterface, int i) {
        Toast.makeText(AlertsActivity.this, getString(R.string.launch_app) + " " + getString(R.string.click), Toast.LENGTH_SHORT).show();

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// add this dependency in gradle file
implementation 'androidx.cardview:cardview:1.0.0'

<androidx.cardview.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="148dp"
    android:layout_marginTop="16dp"
    app:cardCornerRadius="8dp">

    <androidx.constraintlayout.widget.ConstraintLayout

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// gradients
// gradient_1.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
  <gradient
      android:angle="225"
      android:endColor="#1a2980"
      android:startColor="#26d0ce" />
</shape>

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<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:angle="0"
        android:centerColor="#1976d2"
        android:centerX="0.1"
        android:centerY="0.1"
        android:endColor="#6200ea"
        android:gradientRadius="100"

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implementation 'com.google.android.material:material:1.2.0-alpha02'
  
<com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/space_16"
        android:src="@android:drawable/ic_dialog_email"
        android:tint="@color/light_green"

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Snackbar snackbar = Snackbar
        .make(view, R.string.error_occured, Snackbar.LENGTH_LONG)
        .setAction(R.string.retry, new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(AlertsActivity.this, getString(R.string.retry_message), Toast.LENGTH_LONG).show();
            }
        });
snackbar.setActionTextColor(Color.RED);
View snackbarView = snackbar.getView();

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// Gradle dependencies
implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

public class User {

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public interface OnGetUsersCallback {

    void onSuccess(List<User> users);

    void onError();
}