Java tutorial
/* * Copyright (C) 2014 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 com.torrenttunes.android.ui; import android.app.SearchManager; import android.content.Intent; import android.os.Bundle; import android.provider.MediaStore; import android.support.v4.app.FragmentTransaction; import android.support.v4.media.browse.MediaBrowserCompat; import android.support.v4.media.session.MediaControllerCompat; import android.support.v4.media.session.MediaSessionCompat; import android.text.TextUtils; import com.torrenttunes.android.R; import com.torrenttunes.android.utils.LogHelper; /** * Main activity for the music player. * This class hold the MediaBrowser and the MediaController instances. It will create a MediaBrowser * when it is created and connect/disconnect on start/stop. Thus, a MediaBrowser will be always * connected while this activity is running. */ public class MusicPlayerActivity extends BaseActivity implements MediaBrowserFragment.MediaFragmentListener { private static final String TAG = LogHelper.makeLogTag(MusicPlayerActivity.class); private static final String SAVED_MEDIA_ID = "com.example.android.uamp.MEDIA_ID"; public static final String EXTRA_START_FULLSCREEN = "com.example.android.uamp.EXTRA_START_FULLSCREEN"; /** * Optionally used with {@link #EXTRA_START_FULLSCREEN} to carry a MediaDescription to * the {@link FullScreenPlayerActivity}, speeding up the screen rendering * while the {@link android.media.session.MediaController} is connecting. */ public static final String EXTRA_CURRENT_MEDIA_DESCRIPTION = "com.example.android.uamp.CURRENT_MEDIA_DESCRIPTION"; private Bundle mVoiceSearchParams; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LogHelper.d(TAG, "Activity onCreate"); setContentView(R.layout.activity_player); initializeToolbar(); initializeFromParams(savedInstanceState, getIntent()); // Only check if a full screen player is needed on the first time: if (savedInstanceState == null) { startFullScreenActivityIfNeeded(getIntent()); } } @Override protected void onSaveInstanceState(Bundle outState) { String mediaId = getMediaId(); if (mediaId != null) { outState.putString(SAVED_MEDIA_ID, mediaId); } super.onSaveInstanceState(outState); } @Override public void onMediaItemSelected(MediaBrowserCompat.MediaItem item) { LogHelper.d(TAG, "onMediaItemSelected, mediaId=" + item.getMediaId()); if (item.isPlayable()) { final MediaControllerCompat mediaController = getSupportMediaController(); if (mediaController != null) { MediaSessionCompat.Token token = mediaController.getSessionToken(); MediaControllerCompat.TransportControls tc = mediaController.getTransportControls(); mediaController.getTransportControls().playFromMediaId(item.getMediaId(), null); } } else if (item.isBrowsable()) { navigateToBrowser(item.getMediaId()); } else { LogHelper.w(TAG, "Ignoring MediaItem that is neither browsable nor playable: ", "mediaId=", item.getMediaId()); } } @Override public void setToolbarTitle(CharSequence title) { LogHelper.d(TAG, "Setting toolbar title to ", title); if (title == null) { title = getString(R.string.app_name); } setTitle(title); } @Override protected void onNewIntent(Intent intent) { LogHelper.d(TAG, "onNewIntent, intent=" + intent); initializeFromParams(null, intent); startFullScreenActivityIfNeeded(intent); } private void startFullScreenActivityIfNeeded(Intent intent) { if (intent != null && intent.getBooleanExtra(EXTRA_START_FULLSCREEN, false)) { Intent fullScreenIntent = new Intent(this, FullScreenPlayerActivity.class) .setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP) .putExtra(EXTRA_CURRENT_MEDIA_DESCRIPTION, intent.getParcelableExtra(EXTRA_CURRENT_MEDIA_DESCRIPTION)); startActivity(fullScreenIntent); } } protected void initializeFromParams(Bundle savedInstanceState, Intent intent) { String mediaId = null; // check if we were started from a "Play XYZ" voice search. If so, we save the extras // (which contain the query details) in a parameter, so we can reuse it later, when the // MediaSession is connected. if (intent.getAction() != null && intent.getAction().equals(MediaStore.INTENT_ACTION_MEDIA_PLAY_FROM_SEARCH)) { mVoiceSearchParams = intent.getExtras(); LogHelper.d(TAG, "Starting from voice search query=", mVoiceSearchParams.getString(SearchManager.QUERY)); } else { if (savedInstanceState != null) { // If there is a saved media ID, use it mediaId = savedInstanceState.getString(SAVED_MEDIA_ID); } } navigateToBrowser(mediaId); } private void navigateToBrowser(String mediaId) { LogHelper.d(TAG, "navigateToBrowser, mediaId=" + mediaId); MediaBrowserFragment fragment = getBrowseFragment(); if (fragment == null || !TextUtils.equals(fragment.getMediaId(), mediaId)) { fragment = new MediaBrowserFragment(); fragment.setMediaId(mediaId); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); // transaction.setCustomAnimations( // R.animator.slide_in_from_right, R.animator.slide_out_to_left, // R.animator.slide_in_from_left, R.animator.slide_out_to_right); transaction.replace(R.id.container, fragment); // If this is not the top level media (root), we add it to the fragment back stack, // so that actionbar toggle and Back will work appropriately: if (mediaId != null) { transaction.addToBackStack(null); } transaction.commit(); } } public String getMediaId() { MediaBrowserFragment fragment = getBrowseFragment(); if (fragment == null) { return null; } return fragment.getMediaId(); } private MediaBrowserFragment getBrowseFragment() { return (MediaBrowserFragment) getSupportFragmentManager().findFragmentById(R.id.container); } @Override protected void onMediaControllerConnected() { if (mVoiceSearchParams != null) { // If there is a bootstrap parameter to start from a search query, we // send it to the media session and set it to null, so it won't play again // when the activity is stopped/started or recreated: String query = mVoiceSearchParams.getString(SearchManager.QUERY); final MediaControllerCompat mediaController = getSupportMediaController(); if (mediaController != null) { mediaController.getTransportControls().playFromSearch(query, mVoiceSearchParams); } mVoiceSearchParams = null; } getBrowseFragment().onConnected(); } }