Java tutorial
/*** Copyright (c) 2013-14 CommonsWare, LLC 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. Covered in detail in the book _The Busy Coder's Guide to Android Development_ https://commonsware.com/Android */ package com.commonsware.android.preso.decktastic; import android.content.pm.PackageManager; import android.graphics.Color; import android.net.Uri; import android.os.Bundle; import android.support.design.widget.TabLayout; import android.support.v4.view.MenuItemCompat; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.support.v7.app.MediaRouteActionProvider; import android.support.v7.media.MediaControlIntent; import android.support.v7.media.MediaItemStatus; import android.support.v7.media.MediaRouteSelector; import android.support.v7.media.MediaRouter; import android.support.v7.media.MediaSessionStatus; import android.support.v7.media.RemotePlaybackClient; import android.util.TypedValue; import android.view.Display; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.View; import com.commonsware.cwac.preso.PresentationHelper; public class MainActivity extends AppCompatActivity implements PresentationHelper.Listener, TabLayout.OnTabSelectedListener, View.OnClickListener, View.OnLongClickListener { static final String EXTRA_PRESO_ID = "presoId"; private ViewPager pager = null; private SlidePresentationFragment presoFrag = null; private SlidesAdapter adapter = null; private PresentationHelper helper = null; private boolean isFirstRCClick = true; private ReverseChronometer rc = null; private int durationInSeconds = -1; private MediaRouteSelector selector = null; private MediaRouter router = null; private RemotePlaybackClient client = null; private PresoContents preso = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); preso = PresoRoster.getInstance().getPresoById(getIntent().getIntExtra(EXTRA_PRESO_ID, 0)); setContentView(R.layout.activity_main); pager = (ViewPager) findViewById(R.id.pager); helper = new PresentationHelper(this, this); selector = new MediaRouteSelector.Builder().addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK) .build(); router = MediaRouter.getInstance(this); router.addCallback(selector, routeCB, MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY); if (isDirectToTV()) { getSupportActionBar().hide(); } setupPager(); } @Override public void onResume() { super.onResume(); helper.onResume(); } @Override public void onPause() { helper.onPause(); super.onPause(); } @Override public void onDestroy() { disconnect(); router.removeCallback(routeCB); super.onDestroy(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_actions, menu); rc = (ReverseChronometer) menu.findItem(R.id.countdown).getActionView(); rc.setWarningDuration(5 * 60); rc.setOnClickListener(this); rc.setOnLongClickListener(this); rc.setTextSize(TypedValue.COMPLEX_UNIT_SP, 24); rc.setTextColor(Color.WHITE); if (durationInSeconds > 0) { rc.setOverallDuration(durationInSeconds); } MenuItem item = menu.findItem(R.id.route_provider); MediaRouteActionProvider provider = (MediaRouteActionProvider) MenuItemCompat.getActionProvider(item); provider.setRouteSelector(selector); return (super.onCreateOptionsMenu(menu)); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.present: boolean original = item.isChecked(); item.setChecked(!original); if (original) { helper.disable(); } else { helper.enable(); } break; case R.id.first: pager.setCurrentItem(0); break; case R.id.last: pager.setCurrentItem(adapter.getCount() - 1); break; } return (super.onOptionsItemSelected(item)); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_SPACE: case KeyEvent.KEYCODE_DPAD_RIGHT: case KeyEvent.KEYCODE_DPAD_DOWN: case KeyEvent.KEYCODE_PAGE_DOWN: case KeyEvent.KEYCODE_MEDIA_NEXT: if (pager.canScrollHorizontally(1)) { pager.setCurrentItem(pager.getCurrentItem() + 1, true); } return (true); case KeyEvent.KEYCODE_DPAD_LEFT: case KeyEvent.KEYCODE_DPAD_UP: case KeyEvent.KEYCODE_PAGE_UP: case KeyEvent.KEYCODE_MEDIA_PREVIOUS: if (pager.canScrollHorizontally(-1)) { pager.setCurrentItem(pager.getCurrentItem() - 1, true); } return (true); } return (super.onKeyDown(keyCode, event)); } @Override public void onTabReselected(TabLayout.Tab tab) { // unused } @Override public void onTabUnselected(TabLayout.Tab tab) { // unused } @Override public void onTabSelected(TabLayout.Tab tab) { if (presoFrag != null) { presoFrag.setSlideContent(adapter.getSlideImageUri(tab.getPosition())); } if (client != null) { String url = preso.getSlideURL(tab.getPosition()); client.play(Uri.parse(url), "image/png", null, 0, null, playCB); } } @Override public void clearPreso(boolean showInline) { if (presoFrag != null) { presoFrag.dismiss(); presoFrag = null; } } @Override public void showPreso(Display display) { Uri slide = adapter.getSlideImageUri(pager.getCurrentItem()); presoFrag = SlidePresentationFragment.newInstance(this, display, slide); presoFrag.show(getSupportFragmentManager(), "presoFrag"); } @Override public void onClick(View v) { ReverseChronometer rc = (ReverseChronometer) v; if (rc.isRunning()) { rc.stop(); } else { if (isFirstRCClick) { isFirstRCClick = false; rc.reset(); } rc.run(); } } @Override public boolean onLongClick(View v) { ReverseChronometer rc = (ReverseChronometer) v; rc.reset(); return (true); } private void setupPager() { durationInSeconds = preso.duration * 60; if (rc != null) { rc.setOverallDuration(durationInSeconds); } adapter = new SlidesAdapter(this, preso); pager.setAdapter(adapter); if (!isDirectToTV()) { TabLayout tabs = (TabLayout) findViewById(R.id.tabs); tabs.setVisibility(View.VISIBLE); tabs.setupWithViewPager(pager); tabs.addOnTabSelectedListener(this); } } private void connect(MediaRouter.RouteInfo route) { client = new RemotePlaybackClient(getApplicationContext(), route); if (client.isRemotePlaybackSupported()) { String url = preso.getSlideURL(pager.getCurrentItem()); client.play(Uri.parse(url), "image/png", null, 0, null, playCB); } else { client = null; } } private void disconnect() { if (client != null) { client.release(); client = null; } router.getDefaultRoute().select(); } private boolean isDirectToTV() { return (getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEVISION) || getPackageManager().hasSystemFeature(PackageManager.FEATURE_LEANBACK)); } private MediaRouter.Callback routeCB = new MediaRouter.Callback() { @Override public void onRouteSelected(MediaRouter router, MediaRouter.RouteInfo route) { connect(route); } @Override public void onRouteUnselected(MediaRouter router, MediaRouter.RouteInfo route) { disconnect(); } }; RemotePlaybackClient.ItemActionCallback playCB = new RemotePlaybackClient.ItemActionCallback() { @Override public void onResult(Bundle data, String sessionId, MediaSessionStatus sessionStatus, String itemId, MediaItemStatus itemStatus) { } @Override public void onError(String error, int code, Bundle data) { } }; }