使用MediaPlayer+Service完成音乐播放器
1,先把歌曲封装成一个类
package com.example.servicemusic;
public class Song {
private String title;
private String artist;
private int duration;
private String data;
private int size;
public Song(String title, String artist, int duration, String data, int size) {
this.title = title;
this.artist = artist;
this.duration = duration;
this.data = data;
this.size = size;
}
public Song() {
}
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 int getDuration() {
return duration;
}
public void setDuration(int duration) {
this.duration = duration;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
}
2,封装查询本地歌曲的工具类
package com.example.servicemusic;
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 Utils {
private Context context;
private List<Song> list;
public Utils(Context context, List<Song> list) {
this.context = context;
this.list = list;
}
public static List<Song> init(Context context){
List<Song> list=new ArrayList<>();
//获取音乐的uri
Uri uri= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String[] strings={MediaStore.Audio.Media.TITLE,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.DATA,MediaStore.Audio.Media.SIZE};
ContentResolver contentResolver = context.getContentResolver();
Cursor cursor = contentResolver.query(uri, strings, null, null, null);
while (cursor.moveToNext()){
//获取音乐的歌名,作者,时长,地址
String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
int duration = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
int size = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));
Song song = new Song(title,artist,duration,data,size);
list.add(song);
}
cursor.close();
return list;
}
}
3 ,封装一个adapter类
package com.example.servicemusic;
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 java.util.List;
public class Myadpater extends BaseAdapter {
private Context context;
private List<Song> list;
public Myadpater(Context context, List<Song> list) {
this.context = context;
this.list = list;
}
@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 viewholder;
if (convertView==null){
convertView = LayoutInflater.from(context).inflate(R.layout.layout, null);
viewholder=new Viewholder();
viewholder.title=convertView.findViewById(R.id.titleid);
viewholder.artist = convertView.findViewById(R.id.artistid);
viewholder.duration=convertView.findViewById(R.id.durationid);
convertView.setTag(viewholder);
}else {
viewholder = (Viewholder) convertView.getTag();
}
viewholder.title.setText(list.get(position).getTitle());
viewholder.artist.setText(list.get(position).getArtist());
int time = list.get(position).getDuration();
String s = formatTime(time);
viewholder.duration.setText(s);
return convertView;
}
class Viewholder{
TextView title;
TextView artist;
TextView duration;
}
//时长转化为分钟:秒钟
public static String formatTime(int time) {
if (time / 1000 % 60 < 10) {
return time / 1000 / 60 + ":0" + time / 1000 % 60;
} else {
return time / 1000 / 60 + ":" + time / 1000 % 60;
}
}
}
4, adapter中的布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_weight="1"
android:layout_width="0dp"
android:orientation="vertical"
android:layout_height="wrap_content">
<TextView
android:id="@+id/titleid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是歌名"
android:layout_margin="10dp"
/>
<TextView
android:id="@+id/artistid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是歌手"
android:layout_margin="10dp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="78dp"
android:layout_weight="0.5"
android:gravity="center">
<TextView
android:id="@+id/durationid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:text="我是时长" />
</LinearLayout>
</LinearLayout>
5,服务中的所有代码
package com.example.servicemusic;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import java.io.IOException;
import java.util.List;
public class MyService extends Service {
private MediaPlayer mediaPlayer;
private List<Song> list;
private int index;
public MyService() {
}
@Override
public void onCreate() {
super.onCreate();
mediaPlayer=new MediaPlayer();
list=Utils.init(this);
}
@Override
public IBinder onBind(Intent intent) {
return new Musicbinder();
}
//中间人
public class Musicbinder extends Binder{
public void callPlay(int posation){
playsong(posation);
index=posation;
}
public void callPause(){
pause();
}
public void callplaynextsong(){
if (++index>list.size()-1){
index=0;
}
playsong(index);
}
public void callrestart(){
restart();
}
public void callbacksong(){
if (--index<0){
index=0;
}
playsong(index);
}
}
private void restart(){
mediaPlayer.start();
}
private void pause(){
if (mediaPlayer.isPlaying()){
mediaPlayer.pause();
}
}
//播放歌曲
private void playsong(int position){
if (mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
//重置
mediaPlayer.reset();
//取到点击歌曲文件的位置
Song song = list.get(position);
try {
mediaPlayer.setDataSource(song.getData());
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}
6 Activity中的布局.
<?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">
<ListView
android:id="@+id/listid"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
<LinearLayout
android:gravity="center"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/continueid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="继续播放"
/>
<Button
android:id="@+id/stopid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="暂停播放"
/>
<Button
android:id="@+id/backid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一首"
/>
<Button
android:id="@+id/nextid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一首"
/>
</LinearLayout>
</RelativeLayout>
7 Activity中的代码
package com.example.servicemusic;
import android.Manifest;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private ListView listid;
private Button continueid;
private Button stopid;
private Button backid;
private Button nextid;
private List<Song> list;
private Myadpater myadpater;
private int index;
private ServiceConnection connection;
private MyService.Musicbinder biner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewinit();
if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},101);
}
listid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
biner.callPlay(position);
}
});
Intent intent = new Intent(this, MyService.class);
//1.启动
startService(intent);
connection =new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
biner =(MyService.Musicbinder)service;
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
};
//2.绑定
bindService(intent,connection, Service.BIND_AUTO_CREATE);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode==101&&grantResults[0]== PackageManager.PERMISSION_GRANTED){
List<Song> init = Utils.init(this);
myadpater = new Myadpater(this, init);
listid.setAdapter(myadpater);
}
}
private void viewinit() {
listid = (ListView) findViewById(R.id.listid);
continueid = (Button) findViewById(R.id.continueid);
continueid.setOnClickListener(this);
stopid = (Button) findViewById(R.id.stopid);
stopid.setOnClickListener(this);
backid = (Button) findViewById(R.id.backid);
backid.setOnClickListener(this);
nextid = (Button) findViewById(R.id.nextid);
nextid.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int id = v.getId();
switch (id){
case R.id.stopid:
biner.callPause();
break;
case R.id.continueid:
biner.callrestart();
break;
case R.id.nextid:
biner.callplaynextsong();
break;
case R.id.backid:
biner.callbacksong();
break;
}
}
}