Java tutorial
/* * Copyright 2011 Google Inc. * * 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 tw.idv.gasolin.pycontw2012.ui; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.text.format.DateUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import tw.idv.gasolin.pycontw2012.R; import tw.idv.gasolin.pycontw2012.provider.CoscupContract; import tw.idv.gasolin.pycontw2012.ui.tablet.NowPlayingMultiPaneActivity; import tw.idv.gasolin.pycontw2012.util.AnalyticsUtils; import tw.idv.gasolin.pycontw2012.util.ParserUtils; import tw.idv.gasolin.pycontw2012.util.UIUtils; /** * A fragment used in {@link HomeActivity} that shows either a countdown, 'now * playing' link to current sessions, or 'thank you' text, at different times * (before/during/after the conference). It also shows a 'Realtime Search' * button on phones, as a replacement for the {@link TagStreamFragment} that is * visible on tablets on the home screen. */ public class WhatsOnFragment extends Fragment { private Handler mMessageHandler = new Handler(); private TextView mCountdownTextView; private ViewGroup mRootView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mRootView = (ViewGroup) inflater.inflate(R.layout.fragment_whats_on, container); refresh(); return mRootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); } @Override public void onDetach() { super.onDetach(); mMessageHandler.removeCallbacks(mCountdownRunnable); } private void refresh() { mMessageHandler.removeCallbacks(mCountdownRunnable); mRootView.removeAllViews(); final long currentTimeMillis = UIUtils.getCurrentTime(getActivity()); final long startTimeMillis = ParserUtils.parseTime(getString(R.string.lesson_start_time)); final long endTimeMillis = ParserUtils.parseTime(getString(R.string.lesson_end_time)); // Show Loading... and load the view corresponding to the current state // if ( currentTimeMillis < UIUtils.CONFERENCE_START_MILLIS ) { if (currentTimeMillis < startTimeMillis) { setupBefore(); } else if (currentTimeMillis > endTimeMillis) { setupAfter(); } else { setupDuring(); } if (!UIUtils.isHoneycombTablet(getActivity())) { View separator = new View(getActivity()); separator.setLayoutParams(new ViewGroup.LayoutParams(1, ViewGroup.LayoutParams.FILL_PARENT)); separator.setBackgroundResource(R.drawable.whats_on_separator); mRootView.addView(separator); View view = getActivity().getLayoutInflater().inflate(R.layout.whats_on_stream, mRootView, false); view.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { AnalyticsUtils.getInstance(getActivity()).trackEvent("Home Screen Dashboard", "Click", "Realtime Stream", 0); Intent intent = new Intent(getActivity(), TagStreamActivity.class); startActivity(intent); } }); mRootView.addView(view); } } private void setupBefore() { // Before conference, show countdown. mCountdownTextView = (TextView) getActivity().getLayoutInflater().inflate(R.layout.whats_on_countdown, mRootView, false); mRootView.addView(mCountdownTextView); mMessageHandler.post(mCountdownRunnable); } private void setupAfter() { // After conference, show canned text. getActivity().getLayoutInflater().inflate(R.layout.whats_on_thank_you, mRootView, true); } private void setupDuring() { // Conference in progress, show "Now Playing" link. View view = getActivity().getLayoutInflater().inflate(R.layout.whats_on_now_playing, mRootView, false); view.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { if (UIUtils.isHoneycombTablet(getActivity())) { startActivity(new Intent(getActivity(), NowPlayingMultiPaneActivity.class)); } else { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(CoscupContract.Sessions.buildSessionsAtDirUri(System.currentTimeMillis())); intent.putExtra(Intent.EXTRA_TITLE, getString(R.string.title_now_playing)); startActivity(intent); } } }); mRootView.addView(view); } /** * Event that updates countdown timer. Posts itself again to * {@link #mMessageHandler} to continue updating time. */ private Runnable mCountdownRunnable = new Runnable() { public void run() { final long startTimeMillis = ParserUtils.parseTime(getString(R.string.lesson_start_time)); int remainingSec = (int) Math.max(0, (startTimeMillis - System.currentTimeMillis()) / 1000); final boolean conferenceStarted = remainingSec == 0; if (conferenceStarted) { // Conference started while in countdown mode, switch modes and // bail on future countdown updates. mMessageHandler.postDelayed(new Runnable() { public void run() { refresh(); } }, 100); return; } final int secs = remainingSec % 86400; final int days = remainingSec / 86400; final String str = getResources().getQuantityString(R.plurals.whats_on_countdown_title, days, days, DateUtils.formatElapsedTime(secs)); mCountdownTextView.setText(str); // Repost ourselves to keep updating countdown mMessageHandler.postDelayed(mCountdownRunnable, 1000); } }; }