音乐播放器

最新推荐文章于 2024-08-26 20:21:17 发布

原创最新推荐文章于 2024-08-26 20:21:17 发布 · 185 阅读

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CC 4.0 BY-SA版权

本文详细介绍了音乐播放器的开发过程，包括SD卡权限管理、音乐文件读取、列表显示、播放控制及模式切换等功能实现。通过实例展示了如何使用MediaPlayer进行音乐播放，以及如何通过SeekBar实现进度控制。

音乐播放器

- 对这道题的总结

对这道题的总结

先从获取SD卡权限(动态/静态),之后循环读取SD卡中的音乐，(歌手，地址，歌名，时长),添
加入集合(关闭cursor)，之后传入适配器传给listview，之后创建MediaPlayer对象，配合listView
的条目点击事件初步实现播放功能；利用seek监听以及Timer方法来动态改变进度条seek，以及mediaplayer

下一曲，下标++，上一曲下标-- (非0，集合长度判断),
暂停设置boolean 类型标记，在条目点击的时候设置成false,之后再判断，
为true , flag = false, mediaplayer.stop;
为false flag = true,mediaplayer,start;
3总播放顺序模式，随便改改下标就好了；

MainActivity

package com.example.app2;

import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import com.example.app2.JavaBean.Music;
import com.example.app2.entity.MyShare;

import java.io.IOException;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private LinearLayout layoutPlayer;
    private TextView textNamePlayer;
    private TextView textAuthorPlayer;
    private SeekBar seekBar;
    private Button button_muLu;
    private Button button_before;
    private Button button_stop;
    private Button button_next;


    private List<Music> totalList;
    private MediaPlayer mediaPlayer;

    private Timer timer;
    private boolean flag = false;
    //下标
    private int index = 0;
    //模式
    private int mode = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
        }else{
            more();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            more();
        }
    }

    private void more() {
        initView();
        initData();
        //按钮管理
        otherEntity();
        //处理异常或者播放结束
        otherAble();
    }
    private void otherAble() {
    //播放结束之后
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                next(1);
            }
        });
    //播放异常之后
        mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                next(1);
                return true;
            }
        });
    }


    private void otherEntity() {

        //下一曲
        button_next.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                button_stop.setBackgroundResource(R.mipmap.playbar_btn_pause);
                flag = false;
                next(0);
            }
        });
        //上一曲
        button_before.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                button_stop.setBackgroundResource(R.mipmap.playbar_btn_pause);
                flag = false;
                before();
            }
        });

        //暂停
        button_stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(flag){
                    flag = false;
                    button_stop.setBackgroundResource(R.mipmap.playbar_btn_pause);
                    mediaPlayer.start();
                }else{
                    flag = true;
                    button_stop.setBackgroundResource(R.mipmap.playbar_btn_play);
                    mediaPlayer.pause();
                }
            }
        });

        //更换模式
        button_muLu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                PopupWindow pop = new PopupWindow();
                pop.setWidth(200);
                pop.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);

                View inflate = getLayoutInflater().inflate(R.layout.layout_pop, null);
                Button but_order = inflate.findViewById(R.id.but_order);
                Button but_random = inflate.findViewById(R.id.but_random);
                Button but_single = inflate.findViewById(R.id.but_single);

                buttonClick(but_order,but_random,but_single,pop);

                pop.setOutsideTouchable(true);
                pop.setContentView(inflate);
                pop.showAsDropDown(textNamePlayer,0,-350);
            }
        });
    }
    //pop 中按钮选择事件
    private void buttonClick(Button but_order, Button but_random, Button but_single, final PopupWindow pop) {
        but_order.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "顺序播放", Toast.LENGTH_SHORT).show();
                mode = MyShare.ORDER;
                pop.dismiss();
            }
        });

        but_random.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "随机播放", Toast.LENGTH_SHORT).show();
                mode = MyShare.RANDOM;
                pop.dismiss();
            }
        });

        but_single.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "单曲循环", Toast.LENGTH_SHORT).show();
                mode = MyShare.SINGLE;
                pop.dismiss();
            }
        });
    }

    //上一曲
    private void before() {
        index --;
        if(index < 0){
            index = totalList.size()-1;
        }
        play(index);
        setText(index);
    }
    //下一曲
    private void next(int mode_next) {
        switch (mode){
            case MyShare.ORDER:
                index ++;
                if(index > totalList.size()-1){
                    index = 0;
                }
                play(index);
                setText(index);
                break;

            case MyShare.RANDOM:
                index = (int) (Math.random()*totalList.size());
                play(index);
                setText(index);
                break;

            case MyShare.SINGLE:
                if(mode_next == 1){
                    play(index);
                    setText(index);
                }else{
                    index ++;
                    if(index > totalList.size()-1){
                        index = 0;
                    }
                    play(index);
                    setText(index);
                }
                break;
        }
    }

    private void initData() {

        totalList = MyShare.getData(this);
        listView.setAdapter(new MyAdapter(totalList,this));
        //listView监听
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                setText(position);
                index = position;
                play(position);
            }
        });
    }

    private void setText(int position) {
        textNamePlayer.setText(totalList.get(position).getTitle());
        textAuthorPlayer.setText(totalList.get(position).getArtist());
        button_stop.setBackgroundResource(R.mipmap.playbar_btn_pause);
    }

    //播放器所配************************************************************
    private void play(int position) {
        if(timer != null){
            timer.cancel();
        }

        try {
            mediaPlayer.reset();
            mediaPlayer.setDataSource(totalList.get(position).getData());
            mediaPlayer.prepareAsync();
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mediaPlayer.start();
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
        seekBar.setMax(Integer.parseInt(totalList.get(position).getDuration()));
        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                seekBar.setProgress(mediaPlayer.getCurrentPosition());
            }
        },0,1000);

        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if(fromUser) {
                    mediaPlayer.seekTo(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }
//*********************************************************
    private void initView() {
        listView = (ListView) findViewById(R.id.list_view);
        layoutPlayer = (LinearLayout) findViewById(R.id.layout_player);
        textNamePlayer = (TextView) findViewById(R.id.text_name_player);
        textAuthorPlayer = (TextView) findViewById(R.id.text_author_player);
        seekBar = (SeekBar) findViewById(R.id.seek_bar);
        button_muLu = (Button) findViewById(R.id.checkbox_mulu);
        button_before = (Button) findViewById(R.id.checkbox_before);
        button_stop = (Button) findViewById(R.id.checkbox_stop);
        button_next = (Button) findViewById(R.id.checkbox_next);

        mediaPlayer = new MediaPlayer();
    }
}

布局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=".MainActivity"
    android:padding="10dp">

    <!--<Button-->
    <!--android:layout_gravity="center"-->
    <!--android:id="@+id/button_in"-->
    <!--android:text="填充数据"-->
    <!--android:layout_width="wrap_content"-->
    <!--android:layout_height="wrap_content" />-->

    <ListView
        android:layout_above="@id/layout_player"
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:id="@+id/layout_player"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:layout_marginLeft="10dp"
            android:src="@mipmap/ic_launcher"
            android:id="@+id/image_player"
            android:layout_centerVertical="true"
            android:layout_width="75dp"
            android:layout_height="75dp"

            />

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <RelativeLayout
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <TextView
                    android:textSize="17sp"
                    android:id="@+id/text_name_player"
                    android:text="我是歌名"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />

                <TextView
                    android:textSize="17sp"
                    android:layout_marginLeft="15dp"
                    android:id="@+id/text_author_player"
                    android:text="我是歌手"
                    android:layout_alignParentRight="true"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </RelativeLayout>


            <SeekBar
                android:layout_marginRight="5dp"
                android:id="@+id/seek_bar"
                android:layout_marginLeft="10dp"
                android:layout_toRightOf="@id/image_player"
                android:layout_below="@id/text_name_player"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <LinearLayout
                android:layout_alignBottom="@id/image_player"
                android:orientation="horizontal"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@id/image_player"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <Button
                    style="?android:attr/borderlessButtonStyle"
                    android:id="@+id/checkbox_mulu"
                    android:button="@null"
                    android:background="@mipmap/playbar_btn_playlist"
                    android:layout_width="40dp"
                    android:layout_height="40dp" />

                <Button
                    style="?android:attr/borderlessButtonStyle"
                    android:id="@+id/checkbox_before"
                    android:button="@null"
                    android:layout_marginLeft="10dp"
                    android:background="@mipmap/playbar_btn_prev"
                    android:layout_width="40dp"
                    android:layout_height="40dp"/>

                <Button
                    style="?android:attr/borderlessButtonStyle"
                    android:id="@+id/checkbox_stop"
                    android:layout_marginLeft="5dp"
                    android:button="@null"
                    android:background="@mipmap/playbar_btn_play"
                    android:layout_width="40dp"
                    android:layout_height="40dp" />

                <Button
                    style="?android:attr/borderlessButtonStyle"
                    android:id="@+id/checkbox_next"
                    android:layout_marginLeft="5dp"
                    android:button="@null"
                    android:background="@mipmap/playbar_btn_next"
                    android:layout_width="40dp"
                    android:layout_height="40dp"/>

            </LinearLayout>
        </LinearLayout>

    </LinearLayout>

</RelativeLayout>

其他的工具类

package com.example.app2.entity;

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

import com.example.app2.JavaBean.Music;

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

public class MyShare {

    public static final int ORDER = 0;
    public static final int RANDOM = 1;
    public static final int SINGLE = 2;

    public static List<Music> getData(Context context){

        List<Music> list = new ArrayList<>();

        ContentResolver contentResolver = context.getContentResolver();
        Cursor cursor = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
        if(cursor != null){
            while(cursor.moveToNext()){
                String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
                String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
                String duration = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
                String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));

                Music music = new Music();
                music.setArtist(artist);
                music.setData(data);
                music.setDuration(duration);
                music.setTitle(title);

                list.add(music);
            }
            cursor.close();
        }


        return list;
    }
}

适配器

package com.example.app2;

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

import com.example.app2.JavaBean.Music;

import java.util.List;

public class MyAdapter extends BaseAdapter {

    private List<Music> totalList;
    private Context context;
    private LayoutInflater layoutInflater;

    public MyAdapter(List<Music> totalList, Context context) {
        this.totalList = totalList;
        this.context = context;
        layoutInflater = LayoutInflater.from(context);
    }

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

    @Override
    public Object getItem(int position) {
        return totalList.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 = layoutInflater.inflate(R.layout.layout_list_item,null);

            holder.textView_author = convertView.findViewById(R.id.text_author);
            holder.textView_name = convertView.findViewById(R.id.text_name);
            holder.textView_time = convertView.findViewById(R.id.text_time);

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


        String times = totalList.get(position).getDuration();
        String s = String.format("%.2f",((float)(Integer.parseInt(times)/1000))/60);
        String[] split = s.split("\\.");

        holder.textView_time.setText(split[0]+":"+split[1]);
        holder.textView_name.setText(totalList.get(position).getTitle());
        holder.textView_author.setText(totalList.get(position).getArtist());


        return convertView;
    }

    class ViewHolder{
        TextView textView_name;
        TextView textView_author;
        TextView textView_time;
    }

}