Date Picker With Dialog box

 xml :-

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="Select Date"
    android:id="@+id/tvDate"
    android:layout_marginTop="50dp"
    android:layout_centerHorizontal="true"
    android:textSize="30sp"/>

Java :- 

private TextView mDisplayDate;
private DatePickerDialog.OnDateSetListener mDateSetListener;


under oncreate 


mDisplayDate = (TextView) findViewById(R.id.tvDate);

mDisplayDate.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        int day = cal.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog dialog = new DatePickerDialog(
                Appoinment.this,
                android.R.style.Theme_Holo_Light_Dialog_MinWidth,
                mDateSetListener,
                year,month,day);
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        dialog.show();
    }
});

mDateSetListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        month = month + 1;
        Log.d(TAG, "onDateSet: mm/dd/yyy: " + month + "/" + day + "/" + year);

        String date = month + "/" + day + "/" + year;
        mDisplayDate.setText(date);
    }
};

Current Time show in android

 Xml:-

<TextView
    android:layout_width="match_parent"
    android:textSize="20dp"
    android:id="@+id/date"
    android:layout_height="wrap_content"
    android:text="hello world" />

Java :- 

Thread t = new Thread() {
	@Override
	public void run() {
	try {
	while (!isInterrupted()) {
	Thread.sleep(1000);
	runOnUiThread(new Runnable() {
	@Override
	public void run() {
	TextView tdate = (TextView) findViewById(R.id.date);
	long date = System.currentTimeMillis();
	SimpleDateFormat sdf = new SimpleDateFormat("MMM dd yyyy\nhh-mm-ss a");
	String dateString = sdf.format(date);
	tdate.setText(dateString);
	}
	});
	}
	} catch (InterruptedException e) {
	}
	}
	};
	t.start();

Spineer View

 XML Code :- 

<Spinner
    android:id="@+id/spineer"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    />

->Value file-> Srting file  ->

<string-array name="covid">
    <item>Covid Test</item>
    <item>Covid vaccine</item>
</string-array>

Java :- 

package com.niranjan.covid19apps.user;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

import com.niranjan.covid19apps.R;

public class Appoinment extends AppCompatActivity implements AdapterView.OnItemSelectedListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_appoinment);
        Spinner spinner=findViewById(R.id.spineer);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,R.array.covid, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);
    }


    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        String text = adapterView.getItemAtPosition(i).toString();
        Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
    }

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

    }
}

SQLite Database Code

 http://www.codebind.com/android-tutorials-and-examples/android-sqlite-tutorial-example/