【开发一个简单的音乐播放器+服务端】【二】

绝地灬酷狼 2022-05-18 10:57 149阅读 0赞

下面利用Mediaplayer获取服务器音乐文件进行音乐的播放

服务端参考上一篇博客

[https://blog.csdn.net/weixin\_39885435/article/details/81355604][https_blog.csdn.net_weixin_39885435_article_details_81355604]

新建一个android项目，创建一个工具包Utils

Constants类 保存一些基本配置

HttpUtils类 进行网络访问

MediaplayerUtil类 播放器工具

Constants.class:

public class Constants {
    
        //服务器ip
        public static final String SERVER_IP = "http://192.168.0.110:8080/MyMusic/";
    
        //获得所有音乐接口
        public static final String GETALL_MUSIC = "getmusic";
    
        //下载音乐接口
        public static final String DOWNLOAD_MUSIC = "upload/";
    
    }

HttpUtils.class:

public class HttpUtils {
        /** 用到OkHttp3框架，需要先导入两个jar包 */
        public static String HttpPost(String url)
        {
            FormBody.Builder formbody = new FormBody.Builder();
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder().url(Constants.SERVER_IP+url)
                    .post(formbody.build()).build();
    
            try {
                Response response = client.newCall(request).execute();
                if(response.isSuccessful())
                    return response.body().string();
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return null;
        }
    }

MediaplayerUtil.class:

public class MediaplayerUtil{
        public static MediaPlayer mediaPlayer = new MediaPlayer();
        public void initMediaplayer(Context context,String musicname)
        {
            /** 初始化播放器时做判断，若播放器不为空，停止播放，释放资源 */
            if(mediaPlayer!=null)
            {
                mediaPlayer.stop();
                 mediaPlayer.release();
                mediaPlayer=new MediaPlayer();
            }
            try {
                /** 传入音乐名称与Constants类中的常量拼接为资源地址 */
                mediaPlayer.setDataSource(context,Uri.parse(Constants.SERVER_IP+Constants.DOWNLOAD_MUSIC+musicname));
                /** 使用异步准备资源 */
                mediaPlayer.prepareAsync();
                /** 准备完成，播放音乐 */
                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                    @Override
                    public void onPrepared(MediaPlayer mediaPlayer) {
                        mediaPlayer.start();
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
    
        /** 设置音乐播放状态，暂停，播放 */
        public void setMediaPlayerState(ImageView imageView)
        {
            if(mediaPlayer.isPlaying())
            {
                mediaPlayer.pause();
                imageView.setImageResource(R.drawable.play);
                //传入ImageView 暂停时改变ImageView图标为播放图标
            }
            else{
                mediaPlayer.start();
                imageView.setImageResource(R.drawable.pause);
                //重新播放时，改变图标为暂停图标
            }
        }
    }

下面再写一个实体类Music.class保存歌曲信息，以及一个业务类MusicService.class处理业务

Music.class:

public class Music {
        String mid;
        String musicname;
        String author;
        public String getMid() {
            return mid;
        }
    
        public void setMid(String mid) {
            this.mid = mid;
        }
    
        public String getMusicname() {
            return musicname;
        }
    
        public void setMusicname(String musicname) {
            this.musicname = musicname;
        }
    
        public String getAuthor() {
            return author;
        }
    
        public void setAuthor(String author) {
            this.author = author;
        }
    }

MusicService.class

public class MusicService {
        /** 获得所有音乐 */
        public static List<Music> GetAllMusic()
        {
            String result = HttpUtils.HttpPost(Constants.GETALL_MUSIC);
            //String result = "[{'mid':1,'musicname':'北京欢迎你','author':'群星'}]";
            /** 使用Gson框架解析json格式数据 */
            Gson gson = new Gson();
            /** 将数据解析为一个List集合 */
            List<Music> musics = gson.fromJson(result,new TypeToken<List<Music>>(){}.getType());
            return musics;
        }
    }

布局文件:

activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.mymusic.MainActivity">
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:id="@+id/title"
            android:orientation="horizontal"
            android:background="@color/red">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="我的音乐"
                android:textSize="20sp"
                android:layout_marginLeft="20dp"
                android:textColor="@color/white"
                android:layout_gravity="center" />
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_below="@+id/title">
            <ListView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/music_lv"
                android:layout_weight="1"></ListView>
    
            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="@color/gray"
                android:layout_below="@+id/music_lv"
                android:id="@+id/line"></View>
    
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:layout_below="@+id/line">
                <ImageView
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:background="@drawable/play"
                    android:id="@+id/play_music"
                    android:layout_centerVertical="true"
                    android:layout_centerHorizontal="true"/>
                <ImageView
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:layout_alignRight="@id/play_music"
                    android:layout_marginRight="50dp"
                    android:background="@drawable/last"
                    android:id="@+id/last_music"
                    android:layout_centerVertical="true"/>
                <ImageView
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:layout_alignLeft="@id/play_music"
                    android:layout_marginLeft="50dp"
                    android:background="@drawable/next"
                    android:id="@+id/next_music"
                    android:layout_centerVertical="true"/>
            </RelativeLayout>
        </LinearLayout>
    
    </RelativeLayout>

mainactivity\_musiclv\_item.xml:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="10dp">
            <TextView
                android:layout_width="260dp"
                android:layout_height="wrap_content"
                android:id="@+id/music_name"
                android:text="北京东路的日子"
                android:textSize="22sp"
                android:textColor="@color/black"
                android:layout_marginLeft="20dp"
                android:ellipsize="end"
                android:lines="1"/>
            <TextView
                android:layout_width="260dp"
                android:layout_height="wrap_content"
                android:id="@+id/music_author"
                android:text="群星"
                android:textColor="@color/gray"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="5dp"
                android:layout_below="@+id/music_name"
                android:textSize="16sp"
                android:ellipsize="end"
                android:lines="1"/>
        </RelativeLayout>
    </LinearLayout>

最后一个MainActivity.class

MainActivity.class:

public class MainActivity extends Activity implements View.OnClickListener{
        MediaplayerUtil mp = new MediaplayerUtil();
        LayoutInflater layoutInflater;
        ListView music_lv;
        ImageView play,last,next;
        /** 当前播放位置 */
        int CURRENT = 0;
        /** 所有歌曲 */
        public static List<Music> musics = new ArrayList<>();
        /** Handler进行异步处理 */
        Handler handler = new Handler(new Handler.Callback() {
            @Override
            public boolean handleMessage(Message message) {
                switch(message.what)
                {
                    case 0x100:
                        SetAdapter();
                        SetListener();
                        break;
                }
                return false;
            }
        });
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initView();
            GetAllMusic();
        }
    
        /** 初始化控件 */
        public void initView()
        {
            music_lv = findViewById(R.id.music_lv);
            play = findViewById(R.id.play_music);
            next = findViewById(R.id.next_music);
            last = findViewById(R.id.last_music);
            play.setOnClickListener(this);
            next.setOnClickListener(this);
            last.setOnClickListener(this);
        }
    
        /** 获取所有用户信息 */
        public void GetAllMusic()
        {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    musics = MusicService.GetAllMusic();
                    handler.sendEmptyMessage(0x100);
                }
            }).start();
        }
    
        /** 设置监听 */
        public void SetListener()
        {
            music_lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                    TextView item_music = view.findViewById(R.id.music_name);
                    Toast.makeText(getApplication(), item_music.getText(), Toast.LENGTH_SHORT).show();
                    mp.initMediaplayer(getApplication(),item_music.getText().toString());
                    play.setImageResource(R.drawable.pause);
                    CURRENT=i;
                }
            });
        }
    
        /** 播放音乐 */
        public void PlayMusic()
        {
            mp.initMediaplayer(getApplication(),musics.get(CURRENT).getMusicname());
            play.setImageResource(R.drawable.pause);
            Toast.makeText(this, musics.get(CURRENT).getMusicname(), Toast.LENGTH_SHORT).show();
        }
    
        /** 设置适配器 */
        public void SetAdapter()
        {
            class MyAdapter extends BaseAdapter{
    
                @Override
                public int getCount() {
                    return musics.size();
                }
    
                @Override
                public Object getItem(int i) {
                    return musics.get(i);
                }
    
                @Override
                public long getItemId(int i) {
                    return i;
                }
    
                @Override
                public View getView(int i, View view, ViewGroup viewGroup) {
                    layoutInflater = LayoutInflater.from(getApplication());
                    Holder holder = null;
                    /** view为空则从模板中获得View */
                    if(view==null)
                    {
                        holder = new Holder();
                        view = layoutInflater.inflate(R.layout.mainactivity_musiclv_item,null);
                        holder.musicname = view.findViewById(R.id.music_name);
                        holder.musicauthor = view.findViewById(R.id.music_author);
                        view.setTag(holder);
                    }
                    else
                    {
                        holder = (Holder)view.getTag();
                    }
                    holder.musicname.setText(musics.get(i).getMusicname());
                    holder.musicauthor.setText(musics.get(i).getAuthor());
                    return view;
                }
            }
            MyAdapter adapter = new MyAdapter();
            music_lv.setAdapter(adapter);
        }
    
        /** 实现监听器接口的onClick方法 */
        @Override
        public void onClick(View view) {
            switch (view.getId())
            {
                case R.id.play_music:
                    mp.setMediaPlayerState(play);
                    break;
                case R.id.last_music:
                    if(CURRENT==0)
                    {
                        CURRENT= musics.size()-1;
                        PlayMusic();
                    }
                    else
                    {
                        CURRENT--;
                        PlayMusic();
                    }
                    break;
                case R.id.next_music:
                    if(CURRENT==musics.size()-1)
                    {
                        CURRENT=0;
                        PlayMusic();
                    }
                    else
                    {
                        CURRENT++;
                        PlayMusic();
                    }
                    break;
            }
        }
    }
    
    /** Holder类，避免重复获取view */
    class Holder{
        TextView musicname;
        TextView musicauthor;
    }

在进行网络访问操作时，记得还要配置网络权限:

<uses-permission android:name="android.permission.INTERNET" />

到此，一个音乐播放器就完成啦！

除了一些基本功能外，还可以为播放器引入服务，让它在后台播放，或者使用io加入下载音乐，音乐缓存功能

下面贴一下运行结果图，layout比较简单(并不好看)。。。

![70][]

[https_blog.csdn.net_weixin_39885435_article_details_81355604]: https://blog.csdn.net/weixin_39885435/article/details/81355604
[70]: /images/20220518/6d18d6db31f64d9f9cf5963787d69d2c.png