智能终端课程设计之安卓音乐播放器

这里是一个最基本最简单的本地音乐播放器，课设基本就OK了。

课设题目要求

========================================================
题目九 音乐播放器
一、目的与要求

  1. 学会如何使用 MediaPlayer 等媒体播放组件。 2. 学会如何进行数据保存。
    二、功能需求
    音乐播放器主要的功能： 1. 播放列表：在设置菜单，读取 sdcard 指定目录下的所有 mp3 文件，建立播放列表。 2. 播放控制：能够对播放进行控制，能够开始/继续播放、暂停播放、停止播放、上一 首、下一首。 3. 保存播放记录：能够存储已播放过的历史。 4. 扩展功能：（1）增加歌曲库的概念；（2）给歌曲设置类别标签，根据已播放的历 史，在界面上的推荐区域展示推荐歌曲；（3）根据歌名，搜索下载网上的歌曲。

==========================================================

界面展示

## 实现方法 ### 1、layout_main文件编写 
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/welcomimg1">
   <RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="70dp"
       android:layout_alignParentBottom="true"
       android:id="@+id/local_music_bottomlayout">
<!--       android:background="#33EEEEEE"-->

       <ImageView
           android:layout_width="match_parent"
           android:layout_height="0.5dp"/>
<!--           android:background="#9933FA"-->
       <ImageView
           android:layout_width="60dp"
           android:layout_height="60dp"
           android:src="@drawable/music1"
           android:layout_centerVertical="true"
           android:background="@mipmap/a1"
           android:layout_marginLeft="10dp"
           android:id="@+id/local_music_bottom_iv_icon"/>
       <TextView
           android:id="@+id/local_music_bottom_tv_song"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text=""
           android:layout_toRightOf="@id/local_music_bottom_iv_icon"
           android:layout_marginTop="10dp"
           android:layout_marginLeft="10dp"
           android:textSize="10sp"
           android:textStyle="bold"/>
       <TextView
           android:id="@+id/local_music_bottom_tv_singer"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text=""
           android:textSize="8sp"
           android:layout_below="@id/local_music_bottom_tv_song"
           android:layout_alignLeft="@id/local_music_bottom_tv_song"
           android:layout_marginTop="10dp"/>

       <ImageView
           android:id="@+id/local_music_bottom_iv_next"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerVertical="true"
           android:src="@mipmap/play_next"
           android:layout_alignParentRight="true"
           android:layout_marginRight="10dp"/>

       <ImageView
           android:id="@+id/local_music_bottom_iv_play"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerVertical="true"
           android:src="@mipmap/play"
           android:layout_toLeftOf="@id/local_music_bottom_iv_next"
           android:layout_marginRight="20dp"/>

       <ImageView
           android:id="@+id/local_music_bottom_iv_last"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerVertical="true"
           android:src="@mipmap/play_front"
           android:layout_toLeftOf="@id/local_music_bottom_iv_play"
           android:layout_marginRight="20dp"/>
   </RelativeLayout>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/local_music_rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/local_music_bottomlayout">

    </android.support.v7.widget.RecyclerView>
</RelativeLayout>
````





### 2、layout_welcome文件编写

```xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/welcommig1">

    <TextView

        android:id="@+id/tc1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_marginTop="197dp"
        android:layout_marginEnd="139dp"
        android:fontFamily="sans-serif-condensed-medium"
        android:text="BUG  Player"
        android:textColor="#FDFCFC"
        android:textSize="28dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tc1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_marginTop="353dp"
        android:fontFamily="sans-serif"
        android:text="Chuyuxuan1.1.0"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="20dp"
        android:textStyle="bold" />

</RelativeLayout>
## layout_item编写 
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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    app:contentPadding="20dp"

    app:cardBackgroundColor="@color/colorPink"
    >

<!--  app:cardCornerRadius="10dp"
       app:cardElevation="1dp"-->

   <RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content">
       <TextView
           android:id="@+id/item_local_music_num"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="1"
           android:textColor="#141313"
           android:layout_centerVertical="true"
           android:textSize="20sp"
           />
       <TextView
           android:id="@+id/item_local_music_song"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="fsdfs"
           android:textSize="18sp"
          android:textColor="#0F0F0F"
           android:layout_toRightOf="@id/item_local_music_num"
           android:singleLine="true"
           android:layout_marginLeft="20dp"/>

       <TextView
           android:id="@+id/item_local_music_singer"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="fsfsd"
           android:layout_below="@id/item_local_music_song"
           android:layout_alignLeft="@id/item_local_music_song"
           android:layout_marginTop="10dp"
           android:textSize="14sp"
           android:textColor="#050505"/>

       <TextView
           android:id="@+id/item_local_music_line"
           android:layout_width="2dp"
           android:layout_height="18dp"
           android:background="#000000"
           android:layout_toRightOf="@id/item_local_music_singer"
           android:layout_marginLeft="10dp"
           android:layout_marginRight="10dp"
           android:layout_alignTop="@id/item_local_music_singer"/>

       <TextView
           android:id="@+id/item_local_music_album"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text=""
           android:layout_toRightOf="@id/item_local_music_line"
           android:layout_alignTop="@id/item_local_music_singer"
           android:textSize="14sp"
           android:textColor="#000000"
           android:ellipsize="end"
           android:singleLine="true"/>
       <TextView
           android:id="@+id/item_local_music_durtion"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_below="@id/item_local_music_singer"
           android:layout_alignParentRight="true"
           android:text=""
           android:textSize="14sp"
           android:textColor="#050505"/>
   </RelativeLayout>
</android.support.v7.widget.CardView>
````

### 3.小按钮模块布局
```xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    app:contentPadding="20dp"

    app:cardBackgroundColor="@color/colorPink"
    >

<!--  app:cardCornerRadius="10dp"
       app:cardElevation="1dp"-->

   <RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content">
       <TextView
           android:id="@+id/item_local_music_num"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="1"
           android:textColor="#141313"
           android:layout_centerVertical="true"
           android:textSize="20sp"
           />
       <TextView
           android:id="@+id/item_local_music_song"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="fsdfs"
           android:textSize="18sp"
          android:textColor="#0F0F0F"
           android:layout_toRightOf="@id/item_local_music_num"
           android:singleLine="true"
           android:layout_marginLeft="20dp"/>

       <TextView
           android:id="@+id/item_local_music_singer"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="fsfsd"
           android:layout_below="@id/item_local_music_song"
           android:layout_alignLeft="@id/item_local_music_song"
           android:layout_marginTop="10dp"
           android:textSize="14sp"
           android:textColor="#050505"/>

       <TextView
           android:id="@+id/item_local_music_line"
           android:layout_width="2dp"
           android:layout_height="18dp"
           android:background="#000000"
           android:layout_toRightOf="@id/item_local_music_singer"
           android:layout_marginLeft="10dp"
           android:layout_marginRight="10dp"
           android:layout_alignTop="@id/item_local_music_singer"/>

       <TextView
           android:id="@+id/item_local_music_album"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text=""
           android:layout_toRightOf="@id/item_local_music_line"
           android:layout_alignTop="@id/item_local_music_singer"
           android:textSize="14sp"
           android:textColor="#000000"
           android:ellipsize="end"
           android:singleLine="true"/>
       <TextView
           android:id="@+id/item_local_music_durtion"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_below="@id/item_local_music_singer"
           android:layout_alignParentRight="true"
           android:text=""
           android:textSize="14sp"
           android:textColor="#050505"/>
   </RelativeLayout>
</android.support.v7.widget.CardView>
好，到这里，xml布局文件就全部写完了，接下来是java逻辑代码：

MainActivity.java

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package com.animee.localmusic;

import android.content.ContentResolver;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    ImageView nextIv,playIv,lastIv;
    TextView singerTv,songTv;
    RecyclerView musicRv;
//    数据源
    List<LocalMusicBean>mDatas;
    private LocalMusicAdapter adapter;

//    记录当前正在播放的音乐的位置
    int currnetPlayPosition = -1;
//    记录暂停音乐时进度条的位置
    int currentPausePositionInSong = 0;
    MediaPlayer mediaPlayer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        initView();
        mediaPlayer = new MediaPlayer();
        mDatas = new ArrayList<>();
//     创建适配器对象
        adapter = new LocalMusicAdapter(this, mDatas);
        musicRv.setAdapter(adapter);
//        设置布局管理器
        LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        musicRv.setLayoutManager(layoutManager);
//        加载本地数据源
        loadLocalMusicData();
//        设置每一项的点击事件
        setEventListener();
    }

    private void setEventListener() {
        /* 设置每一项的点击事件*/
        adapter.setOnItemClickListener(new LocalMusicAdapter.OnItemClickListener() {
            @Override
            public void OnItemClick(View view, int position) {
                currnetPlayPosition = position;
                LocalMusicBean musicBean = mDatas.get(position);
                playMusicInMusicBean(musicBean);
            }
        });
    }

    public void playMusicInMusicBean(LocalMusicBean musicBean) {
        /*根据传入对象播放音乐*/
        //设置底部显示的歌手名称和歌曲名
        singerTv.setText(musicBean.getSinger());
        songTv.setText(musicBean.getSong());
        stopMusic();
//                重置多媒体播放器
        mediaPlayer.reset();
//                设置新的播放路径
        try {
            mediaPlayer.setDataSource(musicBean.getPath());
            playMusic();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /*
    * 点击播放按钮播放音乐，或者暂停从新播放
    * 播放音乐有两种情况：
    * 1.从暂停到播放
    * 2.从停止到播放
    * */
    private void playMusic() {
        /* 播放音乐的函数*/
        if (mediaPlayer!=null&&!mediaPlayer.isPlaying()) {
            if (currentPausePositionInSong == 0) {
                try {
                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }else{
//                从暂停到播放
                mediaPlayer.seekTo(currentPausePositionInSong);
                mediaPlayer.start();
            }
            playIv.setImageResource(R.mipmap.puse);
        }
    }
    private void pauseMusic() {
        /* 暂停音乐的函数*/
        if (mediaPlayer!=null&&mediaPlayer.isPlaying()) {
            currentPausePositionInSong = mediaPlayer.getCurrentPosition();
            mediaPlayer.pause();
            playIv.setImageResource(R.mipmap.puse);
        }
    }
    private void stopMusic() {
        /* 停止音乐的函数*/
        if (mediaPlayer!=null) {
            currentPausePositionInSong = 0;
            mediaPlayer.pause();
            mediaPlayer.seekTo(0);
            mediaPlayer.stop();
            playIv.setImageResource(R.mipmap.icon_play);
        }

    }

    @Override
    protected void onDestroy()
    {
        super.onDestroy();
        stopMusic();
    }

    private void loadLocalMusicData()
    {
        /* 加载本地存储当中的音乐mp3文件到集合当中*/
//        1.获取ContentResolver对象
        ContentResolver resolver = getContentResolver();
//        2.获取本地音乐存储的Uri地址
        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
//        3 开始查询地址
        Cursor cursor = resolver.query(uri, null, null, null, null);
//        4.遍历Cursor
        int id = 0;
        while (cursor.moveToNext()) {
            String song = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
            String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
            String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
            id++;
            String sid = String.valueOf(id);
            String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
            long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
            SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");
            String time = sdf.format(new Date(duration));
//            将一行当中的数据封装到对象当中
            LocalMusicBean bean = new LocalMusicBean(sid, song, singer, album, time, path);
            mDatas.add(bean);
        }
//        数据源变化，提示适配器更新
        adapter.notifyDataSetChanged();
    }

    private void initView()
    {
        /* 初始化控件的函数*/
        nextIv = findViewById(R.id.local_music_bottom_iv_next);
        playIv = findViewById(R.id.local_music_bottom_iv_play);
        lastIv = findViewById(R.id.local_music_bottom_iv_last);
        singerTv = findViewById(R.id.local_music_bottom_tv_singer);
        songTv = findViewById(R.id.local_music_bottom_tv_song);
        musicRv = findViewById(R.id.local_music_rv);
        nextIv.setOnClickListener(this);
        lastIv.setOnClickListener(this);
        playIv.setOnClickListener(this);
        /*继承父类接口*/
    }

    /*点击事件方法重写*/
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.local_music_bottom_iv_last:
                if (currnetPlayPosition ==0) {
                    Toast.makeText(this,"已经是第一首了，没有上一曲！",Toast.LENGTH_SHORT).show();
                    return;
                }
                currnetPlayPosition = currnetPlayPosition-1;
                LocalMusicBean lastBean = mDatas.get(currnetPlayPosition);
                playMusicInMusicBean(lastBean);
                break;
            case R.id.local_music_bottom_iv_next:
                if (currnetPlayPosition ==mDatas.size()-1) {
                    Toast.makeText(this,"已经是最后一首了，没有下一曲！",Toast.LENGTH_SHORT).show();
                    return;
                }
                currnetPlayPosition = currnetPlayPosition+1;
                LocalMusicBean nextBean = mDatas.get(currnetPlayPosition);
                playMusicInMusicBean(nextBean);
                break;
            case R.id.local_music_bottom_iv_play:
                if (currnetPlayPosition == -1) {
//                    并没有选中要播放的音乐
                    Toast.makeText(this,"请选择想要播放的音乐",Toast.LENGTH_SHORT).show();
                    return;
                }
                if (mediaPlayer.isPlaying()) {
//                    此时处于播放状态，需要暂停音乐
                    pauseMusic();
                }else {
//                    此时没有播放音乐，点击开始播放音乐
                    playMusic();
                }
                break;
        }
    }


}

Adapter适配器

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package com.animee.localmusic;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

public class LocalMusicAdapter extends RecyclerView.Adapter<LocalMusicAdapter.LocalMusicViewHolder>{
    Context context;
    List<LocalMusicBean>mDatas;

    OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    public interface OnItemClickListener{
        public void OnItemClick(View view,int position);
    }
    public LocalMusicAdapter(Context context, List<LocalMusicBean> mDatas) {
        this.context = context;
        this.mDatas = mDatas;
    }

    @NonNull
    @Override
    public LocalMusicViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_local_music,parent,false);
        LocalMusicViewHolder holder = new LocalMusicViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(@NonNull LocalMusicViewHolder holder, final int position) {
        LocalMusicBean musicBean = mDatas.get(position);
        holder.idTv.setText(musicBean.getId());
        holder.songTv.setText(musicBean.getSong());
        holder.singerTv.setText(musicBean.getSinger());
        holder.albumTv.setText(musicBean.getAlbum());
        holder.timeTv.setText(musicBean.getDuration());

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onItemClickListener.OnItemClick(v,position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    class LocalMusicViewHolder extends RecyclerView.ViewHolder{
        TextView idTv,songTv,singerTv,albumTv,timeTv;
        public LocalMusicViewHolder(View itemView) {
            super(itemView);
            idTv = itemView.findViewById(R.id.item_local_music_num);
            songTv = itemView.findViewById(R.id.item_local_music_song);
            singerTv = itemView.findViewById(R.id.item_local_music_singer);
            albumTv = itemView.findViewById(R.id.item_local_music_album);
            timeTv = itemView.findViewById(R.id.item_local_music_durtion);
        }
    }
}


music Bean类

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package com.animee.localmusic;

public class LocalMusicBean {

    private String id; //歌曲id
    private String song; //歌曲名称
    private String singer; //歌手名称
    private String album; //专辑名称
    private String duration; //歌曲时长
    private String path; //歌曲路径

//    public LocalMusicBean() {
//    }

    public LocalMusicBean(String id, String song, String singer, String album, String duration, String path)
    {
        this.id = id;
        this.song = song;
        this.singer = singer;
        this.album = album;
        this.duration = duration;
        this.path = path;
    }

    public String getId()
    {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getSong() {
        return song;
    }

    public void setSong(String song) {
        this.song = song;
    }

    public String getSinger() {
        return singer;
    }

    public void setSinger(String singer) {
        this.singer = singer;
    }

    public String getAlbum() {
        return album;
    }

    public void setAlbum(String album) {
        this.album = album;
    }

    public String getDuration() {
        return duration;
    }

    public void setDuration(String duration) {
        this.duration = duration;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
}

欢迎界面

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package com.animee.localmusic;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.view.WindowManager;

public class weclomeActivity extends Activity
{

    protected void onCreate(@Nullable Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN,
                   WindowManager.LayoutParams.FLAG_FULLSCREEN );
        setContentView(R.layout.activity_welcome);

        handler.sendEmptyMessageDelayed(0,3000);
    }
    private Handler handler = new Handler()
    {
        @Override
        public void handleMessage(Message msg)
        {
            getHome();
            super.handleMessage(msg);
        }
    };
        public void getHome(){
            Intent intent = new Intent(this, MainActivity.class);
            startActivity(intent);
            finish();
        }

}

好，到这里就最基本的代码全部实现了，只要你愿意，全部丢到AS里，导入包，就可以运行。祝课设成功。