Java tutorial
/* Transportr * Copyright (C) 2013 - 2016 Torsten Grote * * This program is Free Software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package de.grobox.liberario.ui; import android.app.DatePickerDialog; import android.app.DatePickerDialog.OnDateSetListener; import android.app.Dialog; import android.app.TimePickerDialog; import android.app.TimePickerDialog.OnTimeSetListener; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.os.Parcelable; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentActivity; import android.util.AttributeSet; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.DatePicker; import android.widget.LinearLayout; import android.widget.TimePicker; import android.widget.Toast; import java.text.DateFormat; import java.util.Calendar; import java.util.Date; import de.grobox.liberario.R; import static android.text.format.DateFormat.getDateFormat; import static android.text.format.DateFormat.getTimeFormat; import static android.widget.Toast.LENGTH_SHORT; import static java.util.Calendar.DAY_OF_MONTH; import static java.util.Calendar.HOUR_OF_DAY; import static java.util.Calendar.MINUTE; import static java.util.Calendar.MONTH; import static java.util.Calendar.YEAR; import static java.util.concurrent.TimeUnit.MILLISECONDS; public class TimeAndDateView extends LinearLayout implements OnTimeSetListener, OnDateSetListener { private final String SUPER_STATE = "superState"; private static final String DATE = "date"; private static final String NOW = "now"; private static final String TODAY = "today"; private final TimeAndDateViewHolder ui; private Calendar calendar; private boolean now = true, today = true; public TimeAndDateView(Context context, AttributeSet attr) { super(context, attr); setOrientation(LinearLayout.HORIZONTAL); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); inflater.inflate(R.layout.time_and_date, this, true); ui = new TimeAndDateViewHolder(this); // Initialize current Time and Date, display it in UI reset(); // Time ui.time.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { TimePickerFragment newFragment = new TimePickerFragment(); newFragment.setOnTimeSetListener(TimeAndDateView.this); // show current time also in dialog if time set to now if (now) resetTime(); Bundle bundle = new Bundle(); bundle.putSerializable(DATE, calendar); newFragment.setArguments(bundle); newFragment.show(((FragmentActivity) getContext()).getSupportFragmentManager(), "timePicker"); } }); // set current time on long click ui.time.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { resetTime(); Toast.makeText(getContext(), R.string.current_time_set, LENGTH_SHORT).show(); return true; } }); // Date ui.date.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { DatePickerFragment newFragment = new DatePickerFragment(); newFragment.setOnDateSetListener(TimeAndDateView.this); // show current date also in dialog if set to today if (today) resetDate(); Bundle bundle = new Bundle(); bundle.putSerializable(DATE, calendar); newFragment.setArguments(bundle); newFragment.show(((FragmentActivity) getContext()).getSupportFragmentManager(), "datePicker"); } }); // set current date on long click ui.date.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { resetDate(); Toast.makeText(getContext(), R.string.current_date_set, LENGTH_SHORT).show(); return true; } }); // Plus 15 ui.plus15.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { addTime(15); } }); // plus 1 hour on long click ui.plus15.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { addTime(60); Toast.makeText(getContext(), R.string.added_1h, LENGTH_SHORT).show(); return true; } }); } public TimeAndDateView(Context context) { this(context, null); } @Override public Parcelable onSaveInstanceState() { Bundle bundle = new Bundle(); bundle.putParcelable(SUPER_STATE, super.onSaveInstanceState()); bundle.putSerializable(DATE, calendar); bundle.putBoolean(NOW, now); bundle.putBoolean(TODAY, today); return bundle; } @Override public void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { // implicit null check Bundle bundle = (Bundle) state; calendar = (Calendar) bundle.getSerializable(DATE); now = bundle.getBoolean(NOW); today = bundle.getBoolean(TODAY); updateTexts(); state = bundle.getParcelable(SUPER_STATE); } super.onRestoreInstanceState(state); } @Override protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { // Makes sure that the state of the child views are not saved super.dispatchFreezeSelfOnly(container); } @Override protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { // Makes sure that the state of the child views are not restored super.dispatchThawSelfOnly(container); } @Override public void onDateSet(@Nullable DatePicker view, int year, int month, int day) { calendar.set(YEAR, year); calendar.set(MONTH, month); calendar.set(DAY_OF_MONTH, day); Calendar c = Calendar.getInstance(); today = c.get(YEAR) == year && c.get(MONTH) == month && c.get(DAY_OF_MONTH) == day; updateTexts(); } @Override public void onTimeSet(@Nullable TimePicker view, int hourOfDay, int minute) { calendar.set(HOUR_OF_DAY, hourOfDay); calendar.set(MINUTE, minute); // check if time can be considered "now" Calendar c1 = Calendar.getInstance(); c1.set(HOUR_OF_DAY, hourOfDay); c1.set(MINUTE, minute); Calendar c2 = Calendar.getInstance(); now = MILLISECONDS.toMinutes(Math.abs(c1.getTimeInMillis() - c2.getTimeInMillis())) < 10; updateTexts(); } public Date getDate() { if (now) resetTime(); if (today) resetDate(); return calendar.getTime(); } public void setDate(Date date) { Calendar tmp = Calendar.getInstance(); tmp.setTime(date); onTimeSet(null, tmp.get(HOUR_OF_DAY), tmp.get(MINUTE)); onDateSet(null, tmp.get(YEAR), tmp.get(MONTH), tmp.get(DAY_OF_MONTH)); } private void updateTexts() { ui.time.setText(getTimeString()); ui.date.setText(getDateString()); } private String getTimeString() { if (now) { return getContext().getString(R.string.now); } DateFormat tf = getTimeFormat(getContext().getApplicationContext()); return tf.format(calendar.getTime()); } private String getDateString() { if (today) { return getContext().getString(R.string.today); } DateFormat tf = getDateFormat(getContext().getApplicationContext()); return tf.format(calendar.getTime()); } private void addTime(int min) { // remember day before adding int day = calendar.get(DAY_OF_MONTH); // update time if it was set to now before if (now) calendar = Calendar.getInstance(); // add min minutes calendar.add(MINUTE, min); // no more now, but maybe today? now = false; if (day != calendar.get(DAY_OF_MONTH)) { today = false; } // update text of buttons updateTexts(); } private void resetTime() { Calendar c = Calendar.getInstance(); calendar.set(HOUR_OF_DAY, c.get(HOUR_OF_DAY)); calendar.set(MINUTE, c.get(MINUTE)); now = true; ui.time.setText(getTimeString()); } private void resetDate() { Calendar c = Calendar.getInstance(); calendar.set(YEAR, c.get(YEAR)); calendar.set(MONTH, c.get(MONTH)); calendar.set(DAY_OF_MONTH, c.get(DAY_OF_MONTH)); today = true; ui.date.setText(getDateString()); } public void reset() { calendar = Calendar.getInstance(); now = true; today = true; updateTexts(); } public static class TimeAndDateViewHolder { public Button time; private Button plus15; public Button date; private TimeAndDateViewHolder(View view) { time = (Button) view.findViewById(R.id.timeButton); plus15 = (Button) view.findViewById(R.id.plus15Button); date = (Button) view.findViewById(R.id.dateButton); } } public static class TimePickerFragment extends DialogFragment { OnTimeSetListener listener; @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { Calendar calendar = (Calendar) getArguments().getSerializable(DATE); if (calendar == null) calendar = Calendar.getInstance(); int hour = calendar.get(HOUR_OF_DAY); int minute = calendar.get(MINUTE); TimePickerDialog tpd = new TimePickerDialog(getActivity(), listener, hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity())); tpd.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.cancel), tpd); tpd.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.ok), tpd); return tpd; } public void setOnTimeSetListener(OnTimeSetListener listener) { // TODO this needs to re-attach on configuration changes this.listener = listener; } } public static class DatePickerFragment extends DialogFragment { OnDateSetListener listener; @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { Calendar calendar = (Calendar) getArguments().getSerializable(DATE); if (calendar == null) calendar = Calendar.getInstance(); int year = calendar.get(YEAR); int month = calendar.get(MONTH); int day = calendar.get(DAY_OF_MONTH); DatePickerDialog dpd = new DatePickerDialog(getActivity(), listener, year, month, day); dpd.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.cancel), dpd); dpd.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.ok), dpd); return dpd; } public void setOnDateSetListener(OnDateSetListener listener) { // TODO this needs to re-attach on configuration changes this.listener = listener; } } }