Cfrtjryk

I currently have an android Activity that allows the users to select the startDate, endDate, startTime and endTime. Once they click the "submit" button, I will combine the startDate and startTime together, and then convert it to milliseconds. The milliseconds will then be used to set an alarm using the AlarmManager. So far, I was able to convert the startDate and startTime to milliseconds. However, I feel that there are far better solutions out there, which I am not aware of. Below is the screenshot of my layout and my java code

MainActivity

public class MainActivity extends AppCompatActivity implements DatePickerDialog.OnDateSetListener,

    TimePickerDialog.OnTimeSetListener, View.OnClickListener {



private TextView txtStartDate;

private TextView txtEndDate;

private TextView txtStartTime;

private TextView txtEndTime;

private Button btnSubmit;



@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    txtStartDate = findViewById(R.id.txtStartDate);

    txtEndDate = findViewById(R.id.txtEndDate);

    txtStartTime = findViewById(R.id.txtStartTime);

    txtEndTime = findViewById(R.id.txtEndTime);

    btnSubmit = findViewById(R.id.btnSubmit);



    txtStartDate.setOnClickListener(this);

    txtEndDate.setOnClickListener(this);

    txtStartTime.setOnClickListener(this);

    txtEndTime.setOnClickListener(this);

    btnSubmit.setOnClickListener(this);



}



@Override

public void onClick(View v) {

    switch (v.getId()) {

        case R.id.txtStartDate:

            /* You need to define a unique tag name for each fragment */

            createDialogFragment("StartDatePicker");

            break;

        case R.id.txtEndDate:

            createDialogFragment("EndDatePicker");

            break;

        case R.id.txtStartTime:

            createDialogFragment("StartTimePicker");

            break;

        case R.id.txtEndTime:

            createDialogFragment("EndTimePicker");

            break;

        case R.id.btnSubmit:

            retrieveInput();

    }

}



private void createDialogFragment(String tag) {

    /* getSupportFragmentManager() will return a FragmentManager

     * that is used to manage the fragments */

    if (tag.equals("StartDatePicker") || tag.equals("EndDatePicker")) {

        DialogFragment datePicker = new DatePickerFragment();

        datePicker.show(getSupportFragmentManager(), tag);

    } else {

        DialogFragment timePicker = new TimePickerFragment();

        timePicker.show(getSupportFragmentManager(), tag);

    }

}



@Override

public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {

    Calendar c = Calendar.getInstance();

    c.set(Calendar.YEAR, year);

    c.set(Calendar.MONTH, month);

    c.set(Calendar.DAY_OF_MONTH, dayOfMonth);



    String currentDateString = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());



    FragmentManager fragmentManager = getSupportFragmentManager();

    if (fragmentManager.findFragmentByTag("StartDatePicker") != null) {

        txtStartDate.setText(currentDateString);

    } else {

        txtEndDate.setText(currentDateString);

    }

}



@Override

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

    Calendar c = Calendar.getInstance();

    c.set(Calendar.HOUR_OF_DAY, hourOfDay);

    c.set(Calendar.MINUTE, minute);



    String currentTimeString = DateFormat.getTimeInstance(DateFormat.SHORT).format(c.getTime());



    FragmentManager fragmentManager = getSupportFragmentManager();

    if (fragmentManager.findFragmentByTag("StartTimePicker") != null) {

        txtStartTime.setText(currentTimeString);

    } else {

        txtEndTime.setText(currentTimeString);

    }

}



private void retrieveInput() {

    /* Get the startDate and startTime and covert it to milliseconds */

    String date = txtStartDate.getText().toString();

    String time = txtStartTime.getText().toString();

    String datetime = date + " " + time;

    SimpleDateFormat df = new SimpleDateFormat("EEEE, MMMM d, yyyy hh:mm a");

    Date date1 = null;

    long milli = 0;

    try {

        date1 = df.parse(datetime);

        milli = date1.getTime();



    } catch (ParseException e) {

        e.printStackTrace();

    }

    Toast.makeText(this, "" + milli, Toast.LENGTH_SHORT).show();

}

}

activity_main.xml

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity"

tools:layout_editor_absoluteY="81dp">



<TextView

    android:id="@+id/txtStartDate"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginStart="48dp"

    android:layout_marginLeft="48dp"

    android:layout_marginTop="136dp"

    android:text="Start Date"

    android:textSize="16sp"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toTopOf="parent" />



<TextView

    android:id="@+id/txtEndDate"

    android:layout_width="wrap_content"

    android:layout_height="27dp"

    android:layout_marginStart="48dp"

    android:layout_marginLeft="48dp"

    android:layout_marginTop="36dp"

    android:text="EndDate"

    android:textSize="16sp"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toBottomOf="@+id/txtStartDate" />



<TextView

    android:id="@+id/txtStartTime"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginTop="136dp"

    android:layout_marginEnd="56dp"

    android:layout_marginRight="56dp"

    android:text="Start Time"

    android:textSize="16sp"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintTop_toTopOf="parent" />



<TextView

    android:id="@+id/txtEndTime"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginTop="40dp"

    android:layout_marginEnd="60dp"

    android:layout_marginRight="60dp"

    android:text="End Time"

    android:textSize="16sp"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintTop_toBottomOf="@+id/txtStartTime" />



<Button

    android:id="@+id/btnSubmit"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginStart="8dp"

    android:layout_marginLeft="8dp"

    android:layout_marginEnd="8dp"

    android:layout_marginRight="8dp"

    android:layout_marginBottom="192dp"

    android:text="Submit"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent" />

DatePickerFragment.java

public class DatePickerFragment extends DialogFragment {



@NonNull

@Override

public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

    // Get the current time and use it as the default values for the picker

    Calendar c = Calendar.getInstance();

    int year = c.get(Calendar.YEAR);

    int month = c.get(Calendar.MONTH);

    int day = c.get(Calendar.DAY_OF_MONTH);

    int hour = c.get(Calendar.HOUR_OF_DAY);

    int minute = c.get(Calendar.MINUTE);



    // Create and return an instance of the DatePickerDialog

    return new DatePickerDialog(getActivity(),

            (DatePickerDialog.OnDateSetListener) getActivity(),

            year, month, day);

TimePickerFragment.java

public class TimePickerFragment extends DialogFragment {



@NonNull

@Override

public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

    Calendar c = Calendar.getInstance();

    int hour = c.get(Calendar.HOUR_OF_DAY);

    int minute = c.get(Calendar.MINUTE);



    return new TimePickerDialog(getActivity(),

            (TimePickerDialog.OnTimeSetListener) getActivity(),

            hour, minute, DateFormat.is24HourFormat(getActivity()));

}

}