package com.android.gesture.study_01_08;

import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class Android_2Activity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_android_2);

  findViewById(R.id.btn_send).setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    ConstraintLayout root = findViewById(R.id.android_root);
    for (int i = 0; i < root.getChildCount(); i++) {
     View view = root.getChildAt(i);

     if (view instanceof EditText && ((EditText) view).getText().length() == 0) {
      Toast.makeText(Android_2Activity.this, "Sorry Please fill in all the information", Toast.LENGTH_SHORT).show();
      return;
     }
    }
   }
  });


 }
}

Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int CurrentTimeTotalMinute = hour * 60 + minute;

 String[] two = time.split("-");
 String[] second = two[1].split(":");
 int secondTotalMinute = Integer.valueOf(second[0]) * 60 + Integer.valueOf(second[1]);