Androidstudio音乐播放器

音乐播放器

XML文件

主页面布局

<?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=".MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9">
    </ListView>

    <SeekBar
        android:id="@+id/seek"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <Button
            android:id="@+id/button_start"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="播放"
            android:textSize="25dp"
            android:onClick="click"/>

        <Button
            android:id="@+id/button_pause"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="暂停"
            android:textSize="25dp"
            android:onClick="click"/>

        <Button
            android:id="@+id/button_last"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="上一首"
            android:textSize="25dp"
            android:onClick="click"/>

        <Button
            android:id="@+id/button_next"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="下一首"
            android:textSize="25dp"
            android:onClick="click"/>

    </LinearLayout>

</LinearLayout>

listView小布局

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

    <TextView
        android:id="@+id/text_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25dp"/>

    <TextView
        android:id="@+id/text_artist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:layout_below="@id/text_title"
        android:layout_marginTop="10dp"/>

    <TextView
        android:id="@+id/text_duration"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_alignBottom="@id/text_artist"/>

</RelativeLayout>

JAVA代码

实体类

package com.example.day17_02.entity;

public class Music {

    private String title;
    private String artist;
    private String duration;
    private String data;
    private String size;

    public Music() {
    }

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

    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 getDuration() {
        return duration;
    }

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

    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;
    }

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

适配器类

package com.example.day17_02.Adapter;

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

import com.example.day17_02.R;
import com.example.day17_02.entity.Music;

import java.util.List;

public class MusicAdapter extends BaseAdapter {

    private List<Music> lists;
    private Context context;

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

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

    @Override
    public Object getItem(int i) {
        return lists.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        ViewHolder holder = null;
        if (view == null){
            holder = new ViewHolder();
            view = View.inflate(context, R.layout.item_layout,null);
            holder.text_artist = view.findViewById(R.id.text_artist);
            holder.text_duration = view.findViewById(R.id.text_duration);
            holder.text_title = view.findViewById(R.id.text_title);
            view.setTag(holder);
        }else {
            holder = (ViewHolder) view.getTag();
        }
        holder.text_title.setText(lists.get(i).getTitle());
        holder.text_duration.setText(lists.get(i).getDuration());
        holder.text_artist.setText(lists.get(i).getArtist());
        return view;
    }

    private class ViewHolder{
        private TextView text_title,text_artist,text_duration;
    }

}

Util类

package com.example.day17_02.Util;

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

import com.example.day17_02.entity.Music;

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

public class MusicUtil {

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

        List<Music> lists = new ArrayList<>();
        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        ContentResolver contentResolver = context.getContentResolver();
        Cursor cursor = contentResolver.query(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));
                String size = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));
                Music music = new Music(title, artist, duration, data, size);
                lists.add(music);
            }
            cursor.close();
            return lists;
        }

        return null;

    }

}

Activity类

package com.example.day17_02;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.Toast;

import com.example.day17_02.Adapter.MusicAdapter;
import com.example.day17_02.Util.MusicUtil;
import com.example.day17_02.entity.Music;

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

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private List<Music> lists;
    private MusicAdapter adapter;
    private ListView listView;
    private MediaPlayer mediaPlayer;
    private SeekBar seek;
    private Timer timer = new Timer();
    private int index = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        seek = findViewById(R.id.seek);
        listView = findViewById(R.id.listView);

        seek.setProgress(0);
        mediaPlayer = new MediaPlayer();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE},1);
        }

        seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if (b == true){
                    mediaPlayer.seekTo(i);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

        lists = new MusicUtil().getMusic(this);
        Log.i(TAG, "" + lists);
        adapter = new MusicAdapter(lists, this);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                index = i;
                seek.setProgress(0);
                mediaPlayer.reset();
                try {
                    seek.setMax(Integer.parseInt(lists.get(i).getDuration()));
                    mediaPlayer.setDataSource(lists.get(i).getData());
                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                seek.setProgress(mediaPlayer.getCurrentPosition());
            }
        },0,1000);
    }

    public void click(View view) {

        switch (view.getId()){
            case R.id.button_start:
                mediaPlayer.start();
                break;

            case R.id.button_pause:
                mediaPlayer.pause();
                break;

            case R.id.button_last:
                index--;
                mediaPlayer.reset();
                try {
                    mediaPlayer.setDataSource(lists.get(index).getData());

                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;

            case R.id.button_next:
                index++;
                mediaPlayer.reset();
                try {
                    mediaPlayer.setDataSource(lists.get(index).getData());
                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;
        }

    }
}