Java tutorial
/* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package app.umitems.greenclock; import android.app.ActionBar; import android.app.ActionBar.Tab; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v13.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.text.TextUtils; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.TextView; import java.util.ArrayList; import java.util.HashSet; import java.util.Locale; import java.util.TimeZone; import app.umitems.greenclock.alarms.AlarmStateManager; import app.umitems.greenclock.provider.Alarm; import app.umitems.greenclock.stopwatch.StopwatchFragment; import app.umitems.greenclock.stopwatch.StopwatchService; import app.umitems.greenclock.stopwatch.Stopwatches; import app.umitems.greenclock.timer.TimerFragment; import app.umitems.greenclock.timer.TimerObj; import app.umitems.greenclock.timer.Timers; import app.umitems.greenclock.worldclock.CitiesActivity; /** * DeskClock clock view for desk docks. */ public class DeskClock extends Activity implements LabelDialogFragment.TimerLabelDialogHandler, LabelDialogFragment.AlarmLabelDialogHandler { private static final boolean DEBUG = false; private static final String LOG_TAG = "DeskClock"; // Alarm action for midnight (so we can update the date display). private static final String KEY_SELECTED_TAB = "selected_tab"; private static final String KEY_CLOCK_STATE = "clock_state"; public static final String SELECT_TAB_INTENT_EXTRA = "healthclock.select.tab"; private ActionBar mActionBar; private Tab mAlarmTab; private Tab mClockTab; private Tab mTimerTab; private Tab mStopwatchTab; private Menu mMenu; private ViewPager mViewPager; private TabsAdapter mTabsAdapter; public static final int ALARM_TAB_INDEX = 0; public static final int CLOCK_TAB_INDEX = 1; public static final int TIMER_TAB_INDEX = 2; public static final int STOPWATCH_TAB_INDEX = 3; // Tabs indices are switched for right-to-left since there is no // native support for RTL in the ViewPager. public static final int RTL_ALARM_TAB_INDEX = 3; public static final int RTL_CLOCK_TAB_INDEX = 2; public static final int RTL_TIMER_TAB_INDEX = 1; public static final int RTL_STOPWATCH_TAB_INDEX = 0; private int mSelectedTab; @Override public void onNewIntent(Intent newIntent) { super.onNewIntent(newIntent); if (DEBUG) Log.d(LOG_TAG, "onNewIntent with intent: " + newIntent); // update our intent so that we can consult it to determine whether or // not the most recent launch was via a dock event setIntent(newIntent); // Timer receiver may ask to go to the timers fragment if a timer expired. int tab = newIntent.getIntExtra(SELECT_TAB_INTENT_EXTRA, -1); if (tab != -1) { if (mActionBar != null) { mActionBar.setSelectedNavigationItem(tab); } } } private void initViews() { if (mTabsAdapter == null) { mViewPager = new ViewPager(this); mViewPager.setId(R.id.desk_clock_pager); // Keep all four tabs to minimize jank. mViewPager.setOffscreenPageLimit(3); mTabsAdapter = new TabsAdapter(this, mViewPager); createTabs(mSelectedTab); } setContentView(mViewPager); mActionBar.setSelectedNavigationItem(mSelectedTab); } private void createTabs(int selectedIndex) { mActionBar = getActionBar(); if (mActionBar != null) { mActionBar.setDisplayOptions(0); mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); mAlarmTab = mActionBar.newTab(); mAlarmTab.setIcon(R.drawable.alarm_tab); mAlarmTab.setContentDescription(R.string.menu_alarm); mTabsAdapter.addTab(mAlarmTab, AlarmClockFragment.class, ALARM_TAB_INDEX); mClockTab = mActionBar.newTab(); mClockTab.setIcon(R.drawable.clock_tab); mClockTab.setContentDescription(R.string.menu_clock); mTabsAdapter.addTab(mClockTab, ClockFragment.class, CLOCK_TAB_INDEX); mTimerTab = mActionBar.newTab(); mTimerTab.setIcon(R.drawable.timer_tab); mTimerTab.setContentDescription(R.string.menu_timer); mTabsAdapter.addTab(mTimerTab, TimerFragment.class, TIMER_TAB_INDEX); mStopwatchTab = mActionBar.newTab(); mStopwatchTab.setIcon(R.drawable.stopwatch_tab); mStopwatchTab.setContentDescription(R.string.menu_stopwatch); mTabsAdapter.addTab(mStopwatchTab, StopwatchFragment.class, STOPWATCH_TAB_INDEX); mActionBar.setSelectedNavigationItem(selectedIndex); mTabsAdapter.notifySelectedPage(selectedIndex); } } @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); mSelectedTab = CLOCK_TAB_INDEX; if (icicle != null) { mSelectedTab = icicle.getInt(KEY_SELECTED_TAB, CLOCK_TAB_INDEX); } // Timer receiver may ask the app to go to the timer fragment if a timer expired Intent i = getIntent(); if (i != null) { int tab = i.getIntExtra(SELECT_TAB_INTENT_EXTRA, -1); if (tab != -1) { mSelectedTab = tab; } } initViews(); setHomeTimeZone(); // We need to update the system next alarm time on app startup because the // user might have clear our data. AlarmStateManager.updateNextAlarm(this); } @Override protected void onResume() { super.onResume(); // We only want to show notifications for stopwatch/timer when the app is closed so // that we don't have to worry about keeping the notifications in perfect sync with // the app. Intent stopwatchIntent = new Intent(getApplicationContext(), StopwatchService.class); stopwatchIntent.setAction(Stopwatches.KILL_NOTIF); startService(stopwatchIntent); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); SharedPreferences.Editor editor = prefs.edit(); editor.putBoolean(Timers.NOTIF_APP_OPEN, true); editor.apply(); Intent timerIntent = new Intent(); timerIntent.setAction(Timers.NOTIF_IN_USE_CANCEL); sendBroadcast(timerIntent); } @Override public void onPause() { Intent intent = new Intent(getApplicationContext(), StopwatchService.class); intent.setAction(Stopwatches.SHOW_NOTIF); startService(intent); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); SharedPreferences.Editor editor = prefs.edit(); editor.putBoolean(Timers.NOTIF_APP_OPEN, false); editor.apply(); Utils.showInUseNotifications(this); super.onPause(); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(KEY_SELECTED_TAB, mActionBar.getSelectedNavigationIndex()); } public void clockButtonsOnClick(View v) { if (v == null) { return; } switch (v.getId()) { case R.id.cities_button: startActivity(new Intent(this, CitiesActivity.class)); break; default: break; } } @Override public boolean onCreateOptionsMenu(Menu menu) { // We only want to show it as a menu in landscape, and only for clock/alarm fragment. mMenu = menu; if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) { if (mActionBar.getSelectedNavigationIndex() == ALARM_TAB_INDEX || mActionBar.getSelectedNavigationIndex() == CLOCK_TAB_INDEX) { // Clear the menu so that it doesn't get duplicate items in case onCreateOptionsMenu // was called multiple times. menu.clear(); getMenuInflater().inflate(R.menu.desk_clock_menu, menu); } // Always return true for landscape, regardless of whether we've inflated the menu, so // that when we switch tabs this method will get called and we can inflate the menu. return true; } return false; } @Override public boolean onPrepareOptionsMenu(Menu menu) { updateMenu(menu); return true; } private void updateMenu(Menu menu) { // Hide "help" if we don't have a URI for it. MenuItem help = menu.findItem(R.id.menu_item_help); if (help != null) { Utils.prepareHelpMenuItem(this, help); } // Hide "lights out" for timer. MenuItem nightMode = menu.findItem(R.id.menu_item_night_mode); if (mActionBar.getSelectedNavigationIndex() == ALARM_TAB_INDEX) { nightMode.setVisible(false); } else if (mActionBar.getSelectedNavigationIndex() == CLOCK_TAB_INDEX) { nightMode.setVisible(true); } } @Override public boolean onOptionsItemSelected(MenuItem item) { if (processMenuClick(item)) { return true; } return super.onOptionsItemSelected(item); } private boolean processMenuClick(MenuItem item) { switch (item.getItemId()) { case R.id.menu_item_settings: startActivity(new Intent(DeskClock.this, SettingsActivity.class)); return true; case R.id.menu_item_help: Intent i = item.getIntent(); if (i != null) { try { startActivity(i); } catch (ActivityNotFoundException e) { // No activity found to match the intent - ignore } } return true; case R.id.menu_item_night_mode: startActivity(new Intent(DeskClock.this, ScreensaverActivity.class)); default: break; } return true; } /*** * Insert the local time zone as the Home Time Zone if one is not set */ private void setHomeTimeZone() { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); String homeTimeZone = prefs.getString(SettingsActivity.KEY_HOME_TZ, ""); if (!homeTimeZone.isEmpty()) { return; } homeTimeZone = TimeZone.getDefault().getID(); SharedPreferences.Editor editor = prefs.edit(); editor.putString(SettingsActivity.KEY_HOME_TZ, homeTimeZone); editor.apply(); Log.v(LOG_TAG, "Setting home time zone to " + homeTimeZone); } public void registerPageChangedListener(DeskClockFragment frag) { if (mTabsAdapter != null) { mTabsAdapter.registerPageChangedListener(frag); } } public void unregisterPageChangedListener(DeskClockFragment frag) { if (mTabsAdapter != null) { mTabsAdapter.unregisterPageChangedListener(frag); } } /*** * Adapter for wrapping together the ActionBar's tab with the ViewPager */ private class TabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener { private static final String KEY_TAB_POSITION = "tab_position"; final class TabInfo { private final Class<?> clss; private final Bundle args; TabInfo(Class<?> _class, int position) { clss = _class; args = new Bundle(); args.putInt(KEY_TAB_POSITION, position); } public int getPosition() { return args.getInt(KEY_TAB_POSITION, 0); } } private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>(); ActionBar mMainActionBar; Context mContext; ViewPager mPager; // Used for doing callbacks to fragments. HashSet<String> mFragmentTags = new HashSet<String>(); public TabsAdapter(Activity activity, ViewPager pager) { super(activity.getFragmentManager()); mContext = activity; mMainActionBar = activity.getActionBar(); mPager = pager; mPager.setAdapter(this); mPager.setOnPageChangeListener(this); } @Override public Fragment getItem(int position) { TabInfo info = mTabs.get(getRtlPosition(position)); DeskClockFragment f = (DeskClockFragment) Fragment.instantiate(mContext, info.clss.getName(), info.args); return f; } @Override public int getCount() { return mTabs.size(); } public void addTab(ActionBar.Tab tab, Class<?> clss, int position) { TabInfo info = new TabInfo(clss, position); tab.setTag(info); tab.setTabListener(this); mTabs.add(info); mMainActionBar.addTab(tab); notifyDataSetChanged(); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { // Do nothing } @Override public void onPageSelected(int position) { // Set the page before doing the menu so that onCreateOptionsMenu knows what page it is. mMainActionBar.setSelectedNavigationItem(getRtlPosition(position)); notifyPageChanged(position); // Only show the overflow menu for alarm and world clock. if (mMenu != null) { // Make sure the menu's been initialized. if (position == ALARM_TAB_INDEX || position == CLOCK_TAB_INDEX) { mMenu.setGroupVisible(R.id.menu_items, true); onCreateOptionsMenu(mMenu); } else { mMenu.setGroupVisible(R.id.menu_items, false); } } } @Override public void onPageScrollStateChanged(int state) { // Do nothing } @Override public void onTabReselected(Tab arg0, FragmentTransaction arg1) { // Do nothing } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { TabInfo info = (TabInfo) tab.getTag(); int position = info.getPosition(); mPager.setCurrentItem(getRtlPosition(position)); } @Override public void onTabUnselected(Tab arg0, FragmentTransaction arg1) { // Do nothing } public void notifySelectedPage(int page) { notifyPageChanged(page); } private void notifyPageChanged(int newPage) { for (String tag : mFragmentTags) { final FragmentManager fm = getFragmentManager(); DeskClockFragment f = (DeskClockFragment) fm.findFragmentByTag(tag); if (f != null) { f.onPageChanged(newPage); } } } public void registerPageChangedListener(DeskClockFragment frag) { String tag = frag.getTag(); if (mFragmentTags.contains(tag)) { Log.wtf(LOG_TAG, "Trying to add an existing fragment " + tag); } else { mFragmentTags.add(frag.getTag()); } // Since registering a listener by the fragment is done sometimes after the page // was already changed, make sure the fragment gets the current page frag.onPageChanged(mMainActionBar.getSelectedNavigationIndex()); } public void unregisterPageChangedListener(DeskClockFragment frag) { mFragmentTags.remove(frag.getTag()); } private boolean isRtl() { return TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()) == View.LAYOUT_DIRECTION_RTL; } private int getRtlPosition(int position) { if (isRtl()) { switch (position) { case TIMER_TAB_INDEX: return RTL_TIMER_TAB_INDEX; case CLOCK_TAB_INDEX: return RTL_CLOCK_TAB_INDEX; case STOPWATCH_TAB_INDEX: return RTL_STOPWATCH_TAB_INDEX; case ALARM_TAB_INDEX: return RTL_ALARM_TAB_INDEX; default: break; } } return position; } } public static abstract class OnTapListener implements OnTouchListener { private float mLastTouchX; private float mLastTouchY; private long mLastTouchTime; private final TextView mMakePressedTextView; private final int mPressedColor, mGrayColor; private final float MAX_MOVEMENT_ALLOWED = 20; private final long MAX_TIME_ALLOWED = 500; public OnTapListener(Activity activity, TextView makePressedView) { mMakePressedTextView = makePressedView; mPressedColor = activity.getResources().getColor(Utils.getPressedColorId()); mGrayColor = activity.getResources().getColor(Utils.getGrayColorId()); } @Override public boolean onTouch(View v, MotionEvent e) { switch (e.getAction()) { case (MotionEvent.ACTION_DOWN): mLastTouchTime = Utils.getTimeNow(); mLastTouchX = e.getX(); mLastTouchY = e.getY(); if (mMakePressedTextView != null) { mMakePressedTextView.setTextColor(mPressedColor); } break; case (MotionEvent.ACTION_UP): float xDiff = Math.abs(e.getX() - mLastTouchX); float yDiff = Math.abs(e.getY() - mLastTouchY); long timeDiff = (Utils.getTimeNow() - mLastTouchTime); if (xDiff < MAX_MOVEMENT_ALLOWED && yDiff < MAX_MOVEMENT_ALLOWED && timeDiff < MAX_TIME_ALLOWED) { if (mMakePressedTextView != null) { v = mMakePressedTextView; } processClick(v); resetValues(); return true; } resetValues(); break; case (MotionEvent.ACTION_MOVE): xDiff = Math.abs(e.getX() - mLastTouchX); yDiff = Math.abs(e.getY() - mLastTouchY); if (xDiff >= MAX_MOVEMENT_ALLOWED || yDiff >= MAX_MOVEMENT_ALLOWED) { resetValues(); } break; default: resetValues(); } return false; } private void resetValues() { mLastTouchX = -1 * MAX_MOVEMENT_ALLOWED + 1; mLastTouchY = -1 * MAX_MOVEMENT_ALLOWED + 1; mLastTouchTime = -1 * MAX_TIME_ALLOWED + 1; if (mMakePressedTextView != null) { mMakePressedTextView.setTextColor(mGrayColor); } } protected abstract void processClick(View v); } /** Called by the LabelDialogFormat class after the dialog is finished. **/ @Override public void onDialogLabelSet(TimerObj timer, String label, String tag) { Fragment frag = getFragmentManager().findFragmentByTag(tag); if (frag instanceof TimerFragment) { ((TimerFragment) frag).setLabel(timer, label); } } /** Called by the LabelDialogFormat class after the dialog is finished. **/ @Override public void onDialogLabelSet(Alarm alarm, String label, String tag) { Fragment frag = getFragmentManager().findFragmentByTag(tag); if (frag instanceof AlarmClockFragment) { ((AlarmClockFragment) frag).setLabel(alarm, label); } } }