Back to project page AntelopeMediaPlayer.
The source code is released under:
GNU General Public License
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/* * Copyright (C) 2011 The Android Open Source Project */*w w w. ja v a 2s . c o m*/ * 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.manicware.antelope; import android.content.Context; import android.media.AudioManager; /** * Convenience class to deal with audio focus. This class deals with everything related to audio * focus: it can request and abandon focus, and will intercept focus change events and deliver * them to a MusicFocusable interface (which, in our case, is implemented by {@link MusicService}). * * This class can only be used on SDK level 8 and above, since it uses API features that are not * available on previous SDK's. */ public class AudioFocusHelper implements AudioManager.OnAudioFocusChangeListener { AudioManager mAM; MusicFocusable mFocusable; public AudioFocusHelper(Context ctx, MusicFocusable focusable) { mAM = (AudioManager) ctx.getSystemService(Context.AUDIO_SERVICE); mFocusable = focusable; } /** Requests audio focus. Returns whether request was successful or not. */ public boolean requestFocus() { return AudioManager.AUDIOFOCUS_REQUEST_GRANTED == mAM.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN); } /** Abandons audio focus. Returns whether request was successful or not. */ public boolean abandonFocus() { return AudioManager.AUDIOFOCUS_REQUEST_GRANTED == mAM.abandonAudioFocus(this); } /** * Called by AudioManager on audio focus changes. We implement this by calling our * MusicFocusable appropriately to relay the message. */ @Override public void onAudioFocusChange(int focusChange) { if (mFocusable == null) return; switch (focusChange) { case AudioManager.AUDIOFOCUS_GAIN: mFocusable.onGainedAudioFocus(); break; case AudioManager.AUDIOFOCUS_LOSS: case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT: mFocusable.onLostAudioFocus(false); break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK: mFocusable.onLostAudioFocus(true); break; default: } } }