[移动开发]Android 播放在线声音工具类

?第一个版本，应该有bug，请谨慎使用

package com.test.first_as_app.testplayer;

import android.media.MediaPlayer;
import android.text.TextUtils;
import android.util.Log;

import java.io.IOException;

public class OnlinePlayer {

    private static OnlinePlayer Instance;
    public static OnlinePlayer getInstance(){
        if(Instance == null){
            Instance = new OnlinePlayer();
        }
        return Instance;
    }

    private MediaPlayer mediaPlayer;

    private final static int Idle = -1; // 未使用状态，或者 调用了stop()
    private final static int Preparing = 0; // 正在加载声音中
    private final static int Prepared = 1; // onPrepared 回调，或者 调用了 pause()
    private final static int Playing = 2; // 正在播放
    private final static int Completion = 3; // 播放完成
    private int mStatus = Idle;

    private boolean mPauseFlag;
    private boolean mStopFlag;
    private boolean mReleaseFlag;

    private String mCurrentUrl;
    private String mWaitUrl;

//    private MediaPlayer.OnErrorListener mOutErrorListener;
    private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {
        @Override
        public boolean onError(MediaPlayer mp, int what, int extra) {
            mp.reset();
            mStatus = Idle;
            return true;
        }
    };

    private MediaPlayer.OnPreparedListener mOutPreparedListener;
    private MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener(){
        @Override
        public void onPrepared(MediaPlayer mp) {
            mStatus = Prepared;
            if(mReleaseFlag){
                Log.e("lugx", "onPrepared  release");
                mediaPlayer.stop();
                mediaPlayer.release();
                mediaPlayer = null;
                return;
            }
            if(mStopFlag){
                Log.e("lugx", "onPrepared  stop");
                mStopFlag = false;
                mediaPlayer.stop();
                mStatus = Idle;
                return;
            }
            if(mPauseFlag){
                Log.e("lugx", "onPrepared  pause");
                mPauseFlag = false;
                return;
            }

            if( TextUtils.isEmpty(mWaitUrl) ) {
                mStatus = Playing;
                mediaPlayer.start();

                if(mOutPreparedListener != null){
                    mOutPreparedListener.onPrepared(mp);
                }
            }
            else{
                String url = mWaitUrl;
                mCurrentUrl = null;
                mWaitUrl = null;
                play(url);
            }
        }
    };

    private MediaPlayer.OnCompletionListener mOutcompletionListener;
    private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            mStatus = Completion;

            if(mOutcompletionListener != null){
                mOutcompletionListener.onCompletion(mp);
            }
        }
    };

    public OnlinePlayer(){
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnErrorListener(mErrorListener);
    }

    private void preparePlay(){
        if(mediaPlayer != null){
            if( mediaPlayer.isPlaying() ){
                mediaPlayer.stop();
            }
            mediaPlayer.reset();
        }
    }

    public void play(String url, MediaPlayer.OnPreparedListener preparedListener,
                     MediaPlayer.OnCompletionListener completionListener){
        this.mOutPreparedListener = preparedListener;
        this.mCompletionListener = completionListener;
        play(url);
    }
    public void play(String url){
        if( TextUtils.isEmpty(url) || mReleaseFlag ||
                mediaPlayer == null){
            return;
        }
        mPauseFlag = false;
        mStopFlag = false;
        if(mStatus == Idle){
            mCurrentUrl = url;
            mWaitUrl = null;
            playInner(url);
        }
        else if(mStatus == Preparing){
            if( !mCurrentUrl.equals(url) ){
                mWaitUrl = url;
            }
        }
        else if(mStatus == Prepared || mStatus == Playing ||
                mStatus == Completion){
            if( url.equals(mCurrentUrl) ){
                mStatus = Playing;
                mediaPlayer.seekTo(0);
                mediaPlayer.start();
            }
            else{
                mCurrentUrl = url;
                mWaitUrl = null;
                playInner(url);
            }
        }
    }

    private void playInner(String url){
        preparePlay();

        mStatus = Preparing;
        mediaPlayer.setOnPreparedListener(mPreparedListener);
        mediaPlayer.setOnCompletionListener(mCompletionListener);
        try {
            mediaPlayer.setDataSource(url);
            mediaPlayer.prepareAsync();
        }catch(IllegalArgumentException e) {
            Log.e("lugx", "playInner  IllegalArgumentException");
            e.printStackTrace();
        }catch(IllegalStateException e){
            Log.e("lugx", "playInner  IllegalStateException");
            e.printStackTrace();
        } catch (IOException e) {
            Log.e("lugx", "playInner  IOException");
            e.printStackTrace();
        }
    }

    public void pause(){
        if(mediaPlayer == null) {
            return;
        }
        if(mStatus == Idle || mStatus == Prepared || mStatus == Completion){
            mPauseFlag = false;
        }
        else if(mStatus == Preparing){
            if( !mStopFlag ) {
                mPauseFlag = true;
            }
        }
        else if(mStatus == Playing){
            mPauseFlag = false;
            mediaPlayer.pause();
            mStatus = Prepared;
        }
    }

    public void start(){
        if(mediaPlayer == null) {
            return;
        }
        if(mStatus == Idle || mStatus == Playing){
            mPauseFlag = false;
        }
        else if(mStatus == Prepared  || mStatus == Completion){
            mStatus = Playing;
            mediaPlayer.start();
        }
        else if(mStatus == Preparing){
            mPauseFlag = false;
        }
    }

    public void seekTo(int msec){
        if(mediaPlayer == null) {
            return;
        }
        if(mStatus == Prepared  || mStatus == Playing ||
                mStatus == Completion){
            mediaPlayer.seekTo(msec);
        }
    }

    public boolean isPlaying(){
        return mediaPlayer.isPlaying();
    }

    public int getPlayerStatus(){
        return mStatus;
    }

    public void stop(){
        if(mediaPlayer == null) {
            return;
        }

        if(mStatus == Idle){
            mStopFlag = false;
        }
        else if(mStatus == Preparing){
            mStopFlag = true;
            mPauseFlag = false;
        }
        else if(mStatus == Prepared || mStatus == Playing ||
                mStatus == Completion){
            mStopFlag = false;
            mediaPlayer.stop();
            mStatus = Idle;
            mCurrentUrl = null;
            mWaitUrl = null;
        }
    }

    public void release(){
        if(mediaPlayer == null) {
            return;
        }
        stop();
        if(mediaPlayer != null){
            if(mStatus == Preparing){
                mReleaseFlag = true;
            }
            else if(mStatus == Idle || mStatus == Prepared ||
                    mStatus == Playing || mStatus == Completion){
                mediaPlayer.release();
                mediaPlayer = null;
            }
        }
    }
}