Widgets

 Activity_main.xml

 <CheckBox

        android:id="@+id/checkbox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="296dp"
        android:text="Cheese"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    
<CheckBox
        android:id="@+id/checkbox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Tomato"
        app:layout_constraintStart_toStartOf="@+id/checkbox1"
        app:layout_constraintTop_toBottomOf="@+id/checkbox1" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:text="Check Order"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
    
<RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/btn"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent">
        <RadioButton
            android:id="@+id/radiobutton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="55dp"
            android:text="without Delivery"
            android:textSize="24sp" />
        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:text="with delivery"
            android:textSize="24sp" />
    </RadioGroup>
    
<Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="15dp"
        android:layout_marginTop="28dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.87"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    
<Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="274dp"
        android:text="Pick Time"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    
<Button
        android:id="@+id/btn_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="43dp"
        android:text="Choose Date"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2" />
    
<ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="70dp"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


Java

Main

public class MainActivity extends AppCompatActivity {

    CheckBox box1, box2;
    Button btn;

    RadioGroup radioGroup;

    Spinner spinner;

    TimePicker timePicker;
    Button b2;

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

        // Checkbox
        box1 = findViewById(R.id.checkbox1);
        box2 = findViewById(R.id.checkbox2);


        //  Radio Group - Radio Buttons
        radioGroup = findViewById(R.id.radioGroup);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checked) {
                RadioButton radioButton = findViewById(checked);
                Toast.makeText(MainActivity.this,
                        "Selected: "+radioButton.getText(),
                        Toast.LENGTH_LONG).show();



            }
        });


        // Spinner
        spinner = findViewById(R.id.spinner);

        String[] courses = {"C++", "Java", "Kotlin", "Data Structures"};

        ArrayAdapter ad = new ArrayAdapter(this,
                android.R.layout.simple_spinner_item,
                courses);

        ad.setDropDownViewResource(
                android.R.layout.simple_spinner_dropdown_item);

        spinner.setAdapter(ad);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(MainActivity.this,
                        "You Select: "+courses[i],
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });


        // Time Picker
        b2 = findViewById(R.id.button2);
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Display the time picker
                DialogFragment  timePickerFrag =
                        new TimePickerFragment();

                timePickerFrag.show(
                        getSupportFragmentManager(),
                        "Pick Time Now:"
                );


            }
        });


        Button b3 = findViewById(R.id.btn_date);
        b3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment dialogFragment =
                        new DatePickerFragment();

                dialogFragment.show(
                        getSupportFragmentManager(),
                        "Pick A Date"
                );
            }
        });


        // Progress bar
        ProgressBar progressBar = findViewById(R.id.progressBar);
        progressBar.setProgress(75);
      //  progressBar.incrementProgressBy()


        btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Increase Progress by 10%
                progressBar.incrementProgressBy(10);





                if (box1.isChecked()){
                    Toast.makeText(MainActivity.this,
                            "Cheese Topping is added", Toast.LENGTH_SHORT).show();
                }else{

                }

                if (box2.isChecked()){
                    Toast.makeText(MainActivity.this,
                            "Tomato Topping is added", Toast.LENGTH_SHORT).show();
                }else{

                }
            }
        });

    }
}

Date picker

public class DatePickerFragment  extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {


    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        return new DatePickerDialog(requireContext(),
                this,
                year,
                month,
                day
                );
    }

    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        Toast.makeText(getContext(),
                "Date: "+ year + month + day,
                Toast.LENGTH_LONG).show();
    }
}

Time Picker

public class TimePickerFragment extends DialogFragment
        implements TimePickerDialog.OnTimeSetListener {


    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);


        return new TimePickerDialog(
                getActivity(),
                this,
                hour,
                minute,
                true);


    }

    @Override
    public void onTimeSet(TimePicker timePicker, int i, int i1) {
        Toast.makeText(getActivity(), "Time picked Successfully", Toast.LENGTH_SHORT).show();
    }
}


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