一個簡單的音樂播放器（實現上一曲下一曲，和自動播放）
阿新 • • 發佈：2019-02-07
參考兩位部落格完成：
https://blog.csdn.net/i_do_can/article/details/50913656，點選開啟連結
註釋比較詳細，直接上程式碼了
Mainactivity.java
package com.example.lancer.lancermusicplayer;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;
import com.example.lancer.lancermusicplayer.bean.Info;
import com.example.lancer.lancermusicplayer.util.musicUtil;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import butterknife.ButterKnife;
import butterknife.InjectView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener, SeekBar.OnSeekBarChangeListener, MediaPlayer.OnCompletionListener {
@InjectView(R.id.musicListView)
ListView musicListView; //lsitview展示資料的
@InjectView(R.id.seekBar)
SeekBar mSeekBar; //seekbar 進度條顯示
@InjectView(R.id.current_time_tv) //播放時的時間
TextView mCurrentTimeTv;
@InjectView(R.id.total_time_tv)
TextView mTotalTimeTv; //歌曲總時間
@InjectView(R.id.previous)
ImageView up; //上一曲按鈕
@InjectView(R.id.play_pause)
ImageView play; //播放暫停按鈕
@InjectView(R.id.next)
ImageView next; //下一曲按鈕
@InjectView(R.id.now)
TextView now; //當前播放歌曲名稱
private musicUtil util; //音樂工具類，用於獲取手機上的音樂
private ArrayList<Info> musicList; //裝了音樂資訊的listView
private MusicAdapter adapter;
private int currentposition; //當前音樂播放位置
private MediaPlayer mediaPlayer;
private Handler mHandler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message message) {
// 展示給進度條和當前時間
int progress = mediaPlayer.getCurrentPosition();
mSeekBar.setProgress(progress);
mCurrentTimeTv.setText(parseTime(progress));
// 繼續定時傳送資料
updateProgress();
return true;
}
});
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);//初始化資料
mediaPlayer = new MediaPlayer();
up.setOnClickListener(this);
play.setOnClickListener(this);
next.setOnClickListener(this);
mSeekBar.setOnSeekBarChangeListener(this);
mediaPlayer.setOnCompletionListener(this);//監聽音樂播放完畢事件，自動下一曲
initData();
}
/**
* 初始化資料
*/
private void initData() {
util = new musicUtil();
musicList = new ArrayList<>();
musicList = util.getMusicInfo(this);
adapter = new MusicAdapter();
musicListView.setAdapter(adapter);
musicListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
currentposition = position; //獲取當前點選條目的位置
changeMusic(currentposition); //切歌
String title = musicList.get(currentposition).getTitle();
now.setText(title); //展示當前播放的歌名
}
});
}
/**
* 上一曲下一曲點選事件
*
* @param view
*/
@Override
public void onClick(View view) {
if (view.getId() == R.id.previous) {//上一曲
changeMusic(--currentposition);
String title = musicList.get(currentposition).getTitle();
now.setText(title); //展示上一曲的歌名
} else if (view.getId() == R.id.play_pause) {//暫停/播放
// 首次點選播放按鈕，預設播放第0首
if (mediaPlayer == null) {
changeMusic(0);
} else {
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
} else {
mediaPlayer.start();
}
}
} else if (view.getId() == R.id.next) {// 下一首
changeMusic(++currentposition);
String title = musicList.get(currentposition).getTitle();
now.setText(title);//展示下一首的歌名
}
}
private void changeMusic(int position) {
if (position < 0) {
currentposition = position = musicList.size() - 1;
} else if (position > musicList.size() - 1) {
currentposition = position = 0;
}
if (mediaPlayer == null) {
mediaPlayer = new MediaPlayer();
}
try {
// 切歌之前先重置，釋放掉之前的資源
mediaPlayer.reset();
// 設定播放源
mediaPlayer.setDataSource(musicList.get(position).getUrl());
// 開始播放前的準備工作，載入多媒體資源，獲取相關資訊
mediaPlayer.prepare();
// 開始播放
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
mSeekBar.setProgress(0);//將進度條初始化
mSeekBar.setMax(mediaPlayer.getDuration());//設定進度條最大值為歌曲總時間
mTotalTimeTv.setText(parseTime(mediaPlayer.getDuration()));//顯示歌曲總時長
updateProgress();//更新進度條
}
private void updateProgress() {
// 使用Handler每間隔1s傳送一次空訊息，通知進度條更新
Message msg = Message.obtain();// 獲取一個現成的訊息
// 使用MediaPlayer獲取當前播放時間除以總時間的進度
int progress = mediaPlayer.getCurrentPosition();
msg.arg1 = progress;
mHandler.sendMessageDelayed(msg, INTERNAL_TIME);
}
/**
* 時間格式化
*
* @param oldTime
* @return
*/
private String parseTime(int oldTime) {
SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");// 時間格式
String newTime = sdf.format(new Date(oldTime));
return newTime;
}
private static final int INTERNAL_TIME = 1000;// 音樂進度間隔時間
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
// 當手停止拖拽進度條時執行該方法
// 獲取拖拽進度
// 將進度對應設定給MediaPlayer
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress = seekBar.getProgress();
mediaPlayer.seekTo(progress);
}
//自動播放下一曲
@Override
public void onCompletion(MediaPlayer mp) {
changeMusic(++currentposition);
}
//音樂播放器的介面卡
public class MusicAdapter extends BaseAdapter {
@Override
public int getCount() {
return musicList.size();
}
@Override
public Info getItem(int position) {
return musicList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = View.inflate(MainActivity.this, R.layout.music_item, null);
viewHolder = new ViewHolder();
viewHolder.video_imageView = convertView.findViewById(R.id.video_imageView);
viewHolder.video_title = convertView.findViewById(R.id.video_title);
viewHolder.video_singer = convertView.findViewById(R.id.video_singer);
/* viewHolder.video_duration = convertView.findViewById(R.id.video_duration);*/
// viewHolder.video_size = convertView.findViewById(R.id.video_size);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
Info item = getItem(position);
viewHolder.video_singer.setText(item.getArtist());
// viewHolder.video_size.setText((int) item.getSize());
viewHolder.video_title.setText(item.getTitle());
/* viewHolder.video_duration.setText(item.getDuration());*/
return convertView;
}
}
static class ViewHolder {
ImageView video_imageView;
TextView video_title;
TextView video_singer;
/* TextView video_duration;
TextView video_size;*/
}
}
package com.example.lancer.lancermusicplayer.util; import android.content.ContentResolver; import android.content.Context; import android.database.Cursor; import android.provider.MediaStore; import com.example.lancer.lancermusicplayer.bean.Info; import java.util.ArrayList; public class musicUtil { Info info;//音樂資訊類 public ArrayList<Info> InfoList;//將音樂資訊填充到該集合中 public ArrayList<Info> getMusicInfo(Context context) { InfoList = new ArrayList<>(); ContentResolver resolver = context.getContentResolver(); Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null , null); if (cursor != null && cursor.getCount() > 0) { Info info = null; while (cursor.moveToNext()) { info = new Info(); info.setArtist(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST))); info.setTitle((cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)))); info.setDuration(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION))); info.setUrl(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA))); // info.setSize(cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE))); InfoList.add(info); } } return InfoList; } }
activity_main.java:
<?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.lancer.lancermusicplayer.MainActivity"> <ListView android:id="@+id/musicListView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/seekBar" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/current_time_tv" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <TextView android:id="@+id/current_time_tv" android:layout_width="100dp" android:layout_height="25dp" android:layout_above="@+id/previous" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:gravity="center" /> <TextView android:id="@+id/total_time_tv" android:layout_width="100dp" android:layout_height="25dp" android:layout_alignEnd="@+id/play_pause" android:layout_alignRight="@+id/play_pause" android:layout_below="@+id/seekBar" android:gravity="center" /> <TextView android:id="@+id/now" android:layout_width="100dp" android:layout_height="25dp" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:layout_below="@+id/seekBar" android:layout_marginEnd="30dp" android:layout_marginRight="30dp" android:gravity="center" /> <ImageView android:id="@+id/previous" android:layout_width="50dp" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:background="@drawable/previous" /> <ImageView android:id="@+id/play_pause" android:layout_width="50dp" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:background="@drawable/play" /> <ImageView android:id="@+id/next" android:layout_width="50dp" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:background="@drawable/next" /> </RelativeLayout>
listview條目xm
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp">
<ImageView
android:id="@+id/video_imageView"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@drawable/music"
android:padding="10dp"/>
<TextView
android:id="@+id/video_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/video_singer"
android:layout_alignStart="@+id/video_singer"
android:layout_alignTop="@+id/video_size"
android:text="title " />
<TextView
android:id="@+id/video_singer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/video_duration"
android:layout_alignBottom="@+id/video_duration"
android:layout_marginLeft="20dp"
android:layout_marginStart="20dp"
android:layout_toEndOf="@+id/video_imageView"
android:layout_toRightOf="@+id/video_imageView"
android:text="singer" />
<TextView
android:id="@+id/video_size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/video_duration"
android:layout_alignLeft="@+id/video_duration"
android:layout_alignStart="@+id/video_duration"
/>
<TextView
android:id="@+id/video_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/video_imageView"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="15dp"
android:layout_marginEnd="75dp"
android:layout_marginRight="75dp"
/>
</RelativeLayout>
音樂資訊類：
package com.example.lancer.lancermusicplayer.bean;
/**
* Created by Lancer on 2018/4/2.
*/
public class Info {
private String title;
private String artist;
private String duration;
private String Url;
/* private long 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 getUrl() {
return Url;
}
public void setUrl(String url) {
Url = url;
}
public String getDuration() {
return duration;
}
public void setDuration(String duration) {
this.duration = duration;
}
/*public long getSize() {
return size;
}
public void setSize(long size) {
this.size = size;
}*/
}
在真機上跑過可以執行。