public void click(View view) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                final TextView t = findViewById(R.id.textView);
                t.setText("Wait...");
                for(int i=0;i<999999;i++)
                    Log.e("test", ""+System.currentTimeMillis());
                t.post(new Runnable() {
                    @Override
                    public void run() {
                        t.setText("Complete");
                    }
                });
            }
        });
    }

public class MainActivity extends AppCompatActivity {

    TextView textView, textView2, textView3;
    ImageButton imageButtonDown, imageButtonUp;
    Calendar calendar;
    String formattedDate;
    SimpleDateFormat dateFormat;
    Button button;
    private static final int REQUEST_CODE = 1;

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



        textView = findViewById(R.id.textView);
        textView2 = findViewById(R.id.textView2);
        textView3 = findViewById(R.id.textView3);
        imageButtonDown = findViewById(R.id.imageButton1);
        imageButtonUp = findViewById(R.id.imageButton2);
        button = findViewById(R.id.button2);

         calendar = Calendar.getInstance();

         dateFormat = new SimpleDateFormat("dd-MMM-yyyy");
         formattedDate = dateFormat.format(calendar.getTime());

         textView.setText(formattedDate);


        imageButtonDown.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                calendar.add(Calendar.DATE, -1);
                formattedDate = dateFormat.format(calendar.getTime());
                textView.setText(formattedDate);
            }
        });

        imageButtonUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                calendar.add(Calendar.DATE, +1);
                formattedDate = dateFormat.format(calendar.getTime());
                textView.setText(formattedDate);
            }
        });

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent i = new Intent(MainActivity.this, SecondActivity.class);
                startActivityForResult(i, REQUEST_CODE);
            }
        });

    }

    protected void onActivityResult(int requestCode, int resultCode, Intent i) {
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE) {

            Information information = new Information(i.getStringExtra("day"), i.getIntExtra("deegres", 0));

            textView2.setText(information.getDay());
            textView3.setText(String.valueOf(information.getDegrees_Celsius()));
        }
    }

}

public class SecondActivity extends AppCompatActivity {

    EditText editText1, editText2;
    Button button;

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

        editText1 = findViewById(R.id.editText);
        editText2 = findViewById(R.id.editText2);
        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                sendInformation();
            }
        });

    }

    public void sendInformation() {

        String day = editText1.getText().toString();
        int deegres = Integer.parseInt(editText2.getText().toString());

        Intent i = new Intent();
        i.putExtra("day", day);
        i.putExtra("deegres", deegres);

        setResult(RESULT_OK, i);
        finish();
    }
}

public class Information {

    private String Day;
    private int degrees_Celsius;


    String getDay() {

        return Day;
    }

    Information(String Day, int degrees_Celsius) {

        this.Day = Day;
        this.degrees_Celsius = degrees_Celsius;
    }

    int getDegrees_Celsius() {

        return degrees_Celsius;
    }
}