android實現(xiàn)背景音樂播放功能
參考了一下網(wǎng)上別人寫的,再使用的時候是放在新開的線程中來播放音樂的,后來發(fā)現(xiàn)每次進(jìn)入Activity后就會重復(fù)開始一個音樂播放的聲音。為了避免重復(fù)開啟播放功能我在原來代碼的基礎(chǔ)上增加了單例模式。這樣就避免了出現(xiàn)重復(fù)播放。
package com.liu.zhen.utils; import android.content.Context; import android.content.res.AssetFileDescriptor; import android.media.MediaPlayer; import android.util.Log; /** * * This class is used for controlling background music * */ public class BackgroundMusic { private static BackgroundMusic backgroundMusic = null; private static final String TAG = "Bg_Music"; private float mLeftVolume; private float mRightVolume; private Context mContext; private MediaPlayer mBackgroundMediaPlayer; private boolean mIsPaused; private String mCurrentPath; private BackgroundMusic(Context context) { this.mContext = context; initData(); } public static BackgroundMusic getInstance(Context context) { if (backgroundMusic == null) { backgroundMusic = new BackgroundMusic(context); } return backgroundMusic; } // 初始化一些數(shù)據(jù) private void initData() { mLeftVolume = 0.5f; mRightVolume = 0.5f; mBackgroundMediaPlayer = null; mIsPaused = false; mCurrentPath = null; } /** * 根據(jù)path路徑播放背景音樂 * * @param path * :assets中的音頻路徑 * @param isLoop * :是否循環(huán)播放 */ public void playBackgroundMusic(String path, boolean isLoop) { if (mCurrentPath == null) { // 這是第一次播放背景音樂--- it is the first time to play background music // 或者是執(zhí)行end()方法后,重新被叫---or end() was called mBackgroundMediaPlayer = createMediaplayerFromAssets(path); mCurrentPath = path; } else { if (!mCurrentPath.equals(path)) { // 播放一個新的背景音樂--- play new background music // 釋放舊的資源并生成一個新的----release old resource and create a new one if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.release(); } mBackgroundMediaPlayer = createMediaplayerFromAssets(path); // 記錄這個路徑---record the path mCurrentPath = path; } } if (mBackgroundMediaPlayer == null) { Log.e(TAG, "playBackgroundMusic: background media player is null"); } else { // 若果音樂正在播放或已近中斷,停止它---if the music is playing or paused, stop it mBackgroundMediaPlayer.stop(); mBackgroundMediaPlayer.setLooping(isLoop); try { mBackgroundMediaPlayer.prepare(); mBackgroundMediaPlayer.seekTo(0); mBackgroundMediaPlayer.start(); this.mIsPaused = false; } catch (Exception e) { Log.e(TAG, "playBackgroundMusic: error state"); } } } /** * 停止播放背景音樂 */ public void stopBackgroundMusic() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.stop(); // should set the state, if not , the following sequence will be // error // play -> pause -> stop -> resume this.mIsPaused = false; } } /** * 暫停播放背景音樂 */ public void pauseBackgroundMusic() { if (mBackgroundMediaPlayer != null && mBackgroundMediaPlayer.isPlaying()) { mBackgroundMediaPlayer.pause(); this.mIsPaused = true; } } /** * 繼續(xù)播放背景音樂 */ public void resumeBackgroundMusic() { if (mBackgroundMediaPlayer != null && this.mIsPaused) { mBackgroundMediaPlayer.start(); this.mIsPaused = false; } } /** * 重新播放背景音樂 */ public void rewindBackgroundMusic() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.stop(); try { mBackgroundMediaPlayer.prepare(); mBackgroundMediaPlayer.seekTo(0); mBackgroundMediaPlayer.start(); this.mIsPaused = false; } catch (Exception e) { Log.e(TAG, "rewindBackgroundMusic: error state"); } } } /** * 判斷背景音樂是否正在播放 * * @return:返回的boolean值代表是否正在播放 */ public boolean isBackgroundMusicPlaying() { boolean ret = false; if (mBackgroundMediaPlayer == null) { ret = false; } else { ret = mBackgroundMediaPlayer.isPlaying(); } return ret; } /** * 結(jié)束背景音樂,并釋放資源 */ public void end() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.release(); } // 重新“初始化數(shù)據(jù)” initData(); } /** * 得到背景音樂的“音量” * * @return */ public float getBackgroundVolume() { if (this.mBackgroundMediaPlayer != null) { return (this.mLeftVolume + this.mRightVolume) / 2; } else { return 0.0f; } } /** * 設(shè)置背景音樂的音量 * * @param volume * :設(shè)置播放的音量,float類型 */ public void setBackgroundVolume(float volume) { this.mLeftVolume = this.mRightVolume = volume; if (this.mBackgroundMediaPlayer != null) { this.mBackgroundMediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume); } } /** * create mediaplayer for music * * @param path * the path relative to assets * @return */ private MediaPlayer createMediaplayerFromAssets(String path) { MediaPlayer mediaPlayer = null; try { AssetFileDescriptor assetFileDescritor = mContext.getAssets() .openFd(path); mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(assetFileDescritor.getFileDescriptor(), assetFileDescritor.getStartOffset(), assetFileDescritor.getLength()); mediaPlayer.prepare(); mediaPlayer.setVolume(mLeftVolume, mRightVolume); } catch (Exception e) { mediaPlayer = null; Log.e(TAG, "error: " + e.getMessage(), e); } return mediaPlayer; } }
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