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 rocks.stalin.android.app.ui; import android.app.FragmentTransaction; import android.app.SearchManager; import android.content.Intent; import android.content.pm.PackageManager; import android.os.Bundle; import android.os.Parcelable; import android.provider.MediaStore; import android.support.annotation.NonNull; import android.support.v4.media.MediaBrowserCompat; import android.support.v4.media.session.MediaControllerCompat; import android.text.TextUtils; import android.util.Log; import rocks.stalin.android.app.R; import rocks.stalin.android.app.utils.LogHelper; import rocks.stalin.android.app.utils.PermissionHelper; /** * 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 = "rocks.stalin.android.app.MEDIA_ID"; private static final String FRAGMENT_TAG = "app_list_container"; public static final String EXTRA_START_FULLSCREEN = "rocks.stalin.android.app.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.support.v4.media.session.MediaControllerCompat} is connecting. */ public static final String EXTRA_CURRENT_MEDIA_DESCRIPTION = "rocks.stalin.android.app.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()) { MediaControllerCompat.getMediaController(this).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) { Log.d(TAG, "navigateToBrowser, mediaId=" + mediaId); MediaBrowserFragment fragment = getBrowseFragment(); if (fragment == null || !TextUtils.equals(fragment.getMediaId(), mediaId)) { fragment = new MediaBrowserFragment(); fragment.setMediaId(mediaId); FragmentTransaction transaction = getFragmentManager().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, FRAGMENT_TAG); // 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) getFragmentManager().findFragmentByTag(FRAGMENT_TAG); } @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); MediaControllerCompat.getMediaController(this).getTransportControls().playFromSearch(query, mVoiceSearchParams); mVoiceSearchParams = null; } getBrowseFragment().onConnected(); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (grantResults.length > 0) { for (int i = 0; i < grantResults.length; i++) { if (grantResults[i] != PackageManager.PERMISSION_GRANTED) { LogHelper.i(TAG, "Did not get permission " + permissions[i]); return; } else { LogHelper.i(TAG, "Got permission " + permissions[i]); PermissionHelper.removeMissingPermission(permissions[i]); } } switch (requestCode) { case PermissionHelper.SHOULD_RECREATE_ACTIVITY: recreate(); break; default: LogHelper.i(TAG, "invalid requestCode " + requestCode); } } } }