使用Service后臺服務實作播放器

package com.example.day121lx;

import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.widget.RemoteViews;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class MyService extends Service {
    private MediaPlayer mediaPlayer;
    private int index=0;
    private int playmusic=1;

    private List<Music> list=new ArrayList<>();
    public MyService() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
         mediaPlayer = new MediaPlayer();
        list = MusicUtil.getDate(this);
    }

    class MyBinder extends Binder{
        public void callplay(int position){
            play(position);
        }

        //暫停播放 在Fragment里邊呼叫方法
        public int zt(){
            mediaPlayer.pause();
            return 0;
        }
        //繼續播放 在Fragment里邊呼叫方法
        public int jx(){

            mediaPlayer.start();
            return 0;
        }

        //上一首 在Fragment里邊呼叫方法
        public void shang(){
            if (--index<=0){

                index=list.size()-1;
            }

            play(index);

        }

        //下一首 在Fragment里邊呼叫方法
        public void next(){
            if (++index>=list.size()){
                index=list.size();
                index=0;
            }
            play(index);

        }
        //進度條
        public void seekbar(int p){
            mediaPlayer.seekTo(p);
        }

        //進度條最大值
        public int getMax(){
         return mediaPlayer.getDuration();

        }
        //進度條當前位置
        public int getp(){

            return mediaPlayer.getCurrentPosition();
        }

        //判斷播放模式 在Fragment里邊呼叫方法
        public void flish(int i){
            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    switch (playmusic){
                        case MusicUtil.SHUNXU:
                            next();
                            break;

                        case MusicUtil.SUIJI:
                            int i = new Random().nextInt(list.size());
                            play(i);
                            break;

                        case MusicUtil.DANQU:
                            play(index);
                            break;

                    }
                }

            });
            playmusic=i;

            //注冊廣播
            MyBro myBro = new MyBro();//廣播接收者
            IntentFilter intentFilter = new IntentFilter();
            intentFilter.addAction("com.wang");
            registerReceiver(myBro,intentFilter);
        }

    }

    @SuppressLint("WrongConstant")
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        
        //通知上邊音樂界面
        Notification.Builder builder = new Notification.Builder(this);
       builder.setSmallIcon(R.mipmap.ic_launcher);
       //遠程布局
        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.inf_layout);
       builder.setCustomContentView(remoteViews);
        
        Intent intent1 = new Intent();
        intent1.setAction("com.wang");
        PendingIntent broadcast = PendingIntent.getBroadcast(this, 0, intent1, 0);


        remoteViews.setOnClickPendingIntent(R.id.zanting,broadcast);
        startForeground(1,builder.build());
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {

       return new MyBinder();
    }

    //開始播放音樂 在Fragment里邊呼叫方法
    public void play(int position){
        mediaPlayer.reset();
        index=position;
        try {
            mediaPlayer.setDataSource(list.get(position).getData());
            mediaPlayer.prepareAsync();
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mediaPlayer.start();
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    //廣播接收者
    class MyBro extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals("com.wang")){
                mediaPlayer.pause();
            }

        }
    }
}

自定義封裝Music類

package com.example.day121lx;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;

import java.util.ArrayList;
import java.util.List;

public class MusicUtil {
    public static final int DANQU=3;
    public static final int SUIJI=2;
    public static final int SHUNXU=1;



    public static List<Music> getDate(Context context) {
        List<Music> list = new ArrayList<>();

        //內容決議者
        ContentResolver contentResolver = context.getContentResolver();
        //查詢本地音樂檔案
        Cursor query = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
        if (query != null) {
            while (query.moveToNext()) {
                String title = query.getString(query.getColumnIndex(MediaStore.Audio.Media.TITLE));
                String artist = query.getString(query.getColumnIndex(MediaStore.Audio.Media.ARTIST));
                String duration = query.getString(query.getColumnIndex(MediaStore.Audio.Media.DURATION));
                String data = query.getString(query.getColumnIndex(MediaStore.Audio.Media.DATA));
                String size = query.getString(query.getColumnIndex(MediaStore.Audio.Media.SIZE));
                String albumId = query.getString(query.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
                Music music = new Music(title, artist, duration, data, size, albumId);
                list.add(music);

            }
            query.close();
        }
        return list;
    }


    //獲取專輯圖片
    public static String getPic(Context context,String albumId){
        ContentResolver contentResolver = context.getContentResolver();
        Uri parse = Uri.parse("content://media/external/audio/albums/" + albumId);

        Cursor query = contentResolver.query(parse, null, null, null, null);
        if (query!=null){
            boolean b = query.moveToNext();
            if (b){
                String album_art = query.getString(query.getColumnIndex("album_art"));
                return album_art;
            }
            query.close();
        }
        return null;
    }


    //同步音樂時長
    public static String fmtTime(String s){
        int i = Integer.parseInt(s);
        if (i / 1000 % 60 < 10){
            return i / 1000 / 60 +":0" + i / 1000 % 60;
        }
        return i /1000 /60 +":" + i / 1000 % 60;
    }
}

利用Fragment+RadioGroup實作頁面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".Main4Activity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/a11"
       android:layout_weight="8"
        android:orientation="vertical"
        ></LinearLayout>

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="bottom"
        android:id="@+id/group"
        >

        <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="音樂"
        android:button="@null"
            android:drawableTop="@drawable/style1"
            android:gravity="center"
            android:layout_weight="1"
        android:id="@+id/a1"
        ></RadioButton>

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="音樂"
            android:gravity="center"
            android:drawableTop="@drawable/style1"
            android:button="@null"
            android:layout_weight="1"
            android:id="@+id/a2"
            ></RadioButton>

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="音樂"
            android:drawableTop="@drawable/style1"
            android:gravity="center"
            android:layout_weight="1"
            android:button="@null"
            android:id="@+id/a3"
            ></RadioButton>

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="音樂"
            android:button="@null"
            android:gravity="center"
            android:drawableTop="@drawable/style1"
            android:layout_weight="1"
            android:id="@+id/a4"
            ></RadioButton>
    </RadioGroup>

</LinearLayout>

blic class Main4Activity extends AppCompatActivity {
    private LinearLayout a11;
    private RadioGroup group;
    private RadioButton a1;
    private RadioButton a2;
    private RadioButton a3;
    private RadioButton a4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);

        FragmentManager supportFragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.a11,new BlankFragment4());
        fragmentTransaction.commit();

        a11 = (LinearLayout) findViewById(R.id.a11);
        group = (RadioGroup) findViewById(R.id.group);
        a1 = (RadioButton) findViewById(R.id.a1);
        a2 = (RadioButton) findViewById(R.id.a2);
        a3 = (RadioButton) findViewById(R.id.a3);
        a4 = (RadioButton) findViewById(R.id.a4);



        group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.a1:
                        FragmentManager supportFragmentManager = getSupportFragmentManager();
                        FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();
                        fragmentTransaction.replace(R.id.a11,new BlankFragment4());
                        fragmentTransaction.commit();

                        break;

                    case R.id.a2:

                        FragmentManager supportFragmentManager1 = getSupportFragmentManager();
                        FragmentTransaction fragmentTransaction1 = supportFragmentManager1.beginTransaction();
                        fragmentTransaction1.replace(R.id.a11,new BlankFragment5());
                        fragmentTransaction1.commit();
                        break;
                }
            }
        });



    }
}

自定義Music類

package com.example.day121lx;

public class Music {
    private String title;
    private String artist;
    private String duartion;
    private String data;
    private String size;
    private String albumId;
    private Integer id;

    public Integer getId() {
        return id;
    }

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

    @Override
    public String toString() {
        return "Music{" +
                "title='" + title + '\'' +
                ", artist='" + artist + '\'' +
                ", duartion='" + duartion + '\'' +
                ", data='" + data + '\'' +
                ", size='" + size + '\'' +
                ", albumId='" + albumId + '\'' +
                ", id=" + id +
                '}';
    }

    public Music(Integer id) {
        this.id = id;
    }

    public Music(String title, String artist, String duartion, String data, String size, String albumId) {
        this.title = title;
        this.artist = artist;
        this.duartion = duartion;
        this.data = data;
        this.size = size;
        this.albumId = albumId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

    public String getDuartion() {
        return duartion;
    }

    public void setDuartion(String duartion) {
        this.duartion = duartion;
    }

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;
    }

    public String getSize() {
        return size;
    }

    public void setSize(String size) {
        this.size = size;
    }

    public String getAlbumId() {
        return albumId;
    }

    public void setAlbumId(String albumId) {
        this.albumId = albumId;
    }

    public Music() {
    }
}

配接器

package com.example.day121lx;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.List;

public class MyAdapter extends BaseAdapter {

    private List<Music> list;
    private Context context;

    public MyAdapter(List<Music> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder=null;
        if (convertView==null){
            holder=new ViewHolder();
            convertView = convertView.inflate(context, R.layout.lv_layout, null);
             holder.title = convertView.findViewById(R.id.title);
             holder.artist = convertView.findViewById(R.id.artist);
            holder.duration  = convertView.findViewById(R.id.duration);
            holder.lv_img  = convertView.findViewById(R.id.lv_img);
            convertView.setTag(holder);

        }else {
             holder = (ViewHolder) convertView.getTag();
        }

        Music music=list.get(position);
        holder.artist.setText(music.getArtist());
        holder.title.setText(music.getTitle());
        holder.duration.setText(MusicUtil.fmtTime(list.get(position).getDuartion()));
        Glide.with(context).load(MusicUtil.getPic(context,music.getAlbumId())).into(holder.lv_img);

        return convertView;
    }

    class ViewHolder{
        TextView title;
        TextView artist;
        TextView duration;
        ImageView lv_img;

    }
}

音樂展示布局檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <ImageView
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@mipmap/ic_launcher"
            android:id="@+id/lv_img"
            ></ImageView>

        <TextView
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="111"
            android:id="@+id/title"
            ></TextView>

        <TextView
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="222"
            android:id="@+id/artist"
            android:layout_marginLeft="100dp"
            ></TextView>

        <TextView
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="333"
            android:id="@+id/duration"
            android:layout_marginTop="30dp"
            android:layout_marginLeft="-100dp"
            ></TextView>

    </LinearLayout>



</LinearLayout>

Fragment音樂界面整體效果布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".BlankFragment4">


    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lv"
        android:layout_weight="8"
        ></ListView>

    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/seekbar"
        ></SeekBar>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/shangyishou"
            android:id="@+id/shang"
            android:layout_marginLeft="80dp"
            ></ImageView>

       <ImageView
           android:layout_width="50dp"
           android:layout_height="50dp"
           android:src="@drawable/bofang2"
           android:id="@+id/bofang"
           ></ImageView>

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/bofang2"
           android:id="@+id/bofang1"
            ></ImageView>

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/xiayishou"
            android:id="@+id/next"
            ></ImageView>


        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/moshi"
            android:id="@+id/model"
            ></ImageView>


    </LinearLayout>




</LinearLayout>

Fragment代碼

package com.example.day121lx;


import android.Manifest;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;

import android.os.IBinder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;


/**
 * A simple {@link Fragment} subclass.
 */
public class BlankFragment4 extends Fragment {
    private List<Music> list;
    private ListView lv;
    private ImageView shang;//上一首
    private ImageView next;//下一首
    private ImageView bofang;
    private SeekBar seekbar;
    private ImageView bofang1;
    private ImageView model;//模式
    private Timer timer;

    private   MyService.MyBinder myBinder;


    public BlankFragment4() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View inflate = inflater.inflate(R.layout.fragment_blank_fragment4, container, false);


        lv = (ListView)inflate. findViewById(R.id.lv);

        seekbar = (SeekBar)inflate. findViewById(R.id.seekbar);
        shang = (ImageView)inflate. findViewById(R.id.shang);
        next = (ImageView)inflate. findViewById(R.id.next);
        bofang1 = (ImageView)inflate. findViewById(R.id.bofang1);
        bofang = (ImageView) inflate.findViewById(R.id.bofang);


        model = (ImageView) inflate.findViewById(R.id.model);

        //初始化List
        list=new ArrayList<>();


        //模式點擊事件
        model.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //使用popWindow彈窗實作
                final PopupWindow popupWindow = new PopupWindow();
                popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
                popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);

                //單曲回圈

                View inflate1 = LayoutInflater.from(getActivity()).inflate(R.layout.pop_layout, null);
                final TextView danqu = inflate1.findViewById(R.id.pop_danqu);
                    danqu.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            myBinder.flish(MusicUtil.DANQU);
                            Toast.makeText(getActivity(), "單曲回圈", Toast.LENGTH_SHORT).show();
                            popupWindow.dismiss();
                        }
                    });
                //隨機播放
                TextView suiji  = inflate1.findViewById(R.id.pop_suiji);
                suiji.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        myBinder.flish(MusicUtil.SUIJI);
                        Toast.makeText(getActivity(), "隨機播放", Toast.LENGTH_SHORT).show();
                        popupWindow.dismiss();
                    }
                });

                TextView shunxu  = inflate1.findViewById(R.id.pop_shunxu);
                shunxu.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        myBinder.flish(MusicUtil.SHUNXU);
                        Toast.makeText(getActivity(), "順序播放", Toast.LENGTH_SHORT).show();
                        popupWindow.dismiss();
                    }
                });
                //內容
                popupWindow.setContentView(inflate1);
                //點擊對話框消失
                popupWindow.setOutsideTouchable(true);

                popupWindow.showAsDropDown(model,0,-350);
            }
        });



        //進度條
        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

                if (fromUser){
                    //后臺服務呼叫方法
                    myBinder.seekbar(progress);
                }

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });


        //點擊暫停更換圖片
        bofang.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myBinder.zt();
                bofang.setImageResource(R.drawable.bofang2);
                bofang1.setImageResource(R.drawable.bofang2);
            }
        });


        //點擊繼續圖片更換
        bofang1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myBinder.jx();
                bofang1.setImageResource(R.drawable.bofang1);

            }
        });


        //上一首
        shang.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myBinder.shang();
            }
        });

        //下一首
        next.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myBinder.next();
            }
        });

        //啟動一個后臺服務
        Intent intent = new Intent(getActivity(),MyService.class);
        getActivity().startService(intent);


        //跟Service服務進行系結
        ServiceConnection serviceConnection=new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                 myBinder= (MyService.MyBinder) service;
            }

            @Override
            public void onServiceDisconnected(ComponentName name) {

            }
        };
      getActivity().bindService(intent,serviceConnection,Context.BIND_ABOVE_CLIENT);

      //版本判斷
        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
            //讀取SD卡權限
            requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
        }


        //ListView點擊事件
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //呼叫服務方法
                myBinder.callplay(position);
                bofang.setImageResource(R.drawable.bofang1);
                myBinder.flish(position);
                if (timer==null){
                    timer = new Timer();
                    timer.schedule(new TimerTask() {
                        @Override
                        public void run() {
                            //設定進度條進度
                            seekbar.setMax(myBinder.getMax());
                            seekbar.setProgress(myBinder.getp());
                        }
                    },0,1000);
                }

            }
        });

        // Inflate the layout for this fragment
        return inflate;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        //判斷是否同意讀取sd卡
        if (requestCode==100&&grantResults[0]==PackageManager.PERMISSION_GRANTED){

           list  = MusicUtil.getDate(getActivity());
            MyAdapter myAdapter = new MyAdapter(list,getActivity());
            lv.setAdapter(myAdapter);

        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}