封装歌曲的类
package com.example.service_music;
/**
* ${FENG}
* 2019-07-24
*/
public class Song {
/** * 歌手 */
private String singer;
/** * 歌曲名 */
private String song;
/** * 歌曲的地址 */
private String path;
/** * 歌曲长度 */
private int duration;
/** * 歌曲的大小 */
private long size;
/** 当前歌曲的播放位置*/
private int position;
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}
public String getSinger() {
return singer;
}
public void setSinger(String singer) {
this.singer = singer;
}
public String getSong() {
return song;
}
public void setSong(String song) {
this.song = song;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public int getDuration() {
return duration;
}
public void setDuration(int duration) {
this.duration = duration;
}
public long getSize() {
return size;
}
public void setSize(long size) {
this.size = size;
}
}
读取所有的歌曲
public class MusicUtils {
private static final String TAG = "MusicUtils";
/**
* 扫描系统里面的音频文件，返回一个list集合
*/
public static List<Song> getMusicData(Context context) {
List<Song> list = new ArrayList<>();
int i = 0;
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
Log.i(TAG, "getMusicData: "+MediaStore.Audio.Media.EXTERNAL_CONTENT_URI.getPath());
if (cursor != null) {
while (cursor.moveToNext()) {
Song song = new Song();
song.setSong( cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME)));
song.setSinger( cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)));
song.setPath(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)));
song.setDuration( cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)));
song.setSize( cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE)));
song.setPosition(i);
i++;
// 释放资源
cursor.close();
}else{
Toast.makeText(context, "没有找到文件", Toast.LENGTH_SHORT).show();
Log.i(TAG, "getMusicData: 没有");
}
return list;
}
//格式化时间
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;
}
}
}
创建listview布局适配器
public class MyAdapter extends BaseAdapter {
private Context context;
private List<Song> list;
private int position_flag = 0;
public MyAdapter(MainActivity mainActivity, List<Song> list) {
this.context = mainActivity;
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return list.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();
// 引入布局
view = View.inflate(context, R.layout.list_item, null);
// 实例化对象
holder.song = (TextView) view.findViewById(R.id.item_mymusic_song);
holder.singer = (TextView) view
.findViewById(R.id.item_mymusic_singer);
holder.duration = (TextView) view
.findViewById(R.id.item_mymusic_duration);
holder.position = (TextView) view
.findViewById(R.id.item_mymusic_postion);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// 给控件赋值
String string_song = list.get(i).getSong();
if (string_song.length() >= 5
&& string_song.substring(string_song.length() - 4,
string_song.length()).equals(".mp3")) {
holder.song.setText(string_song.substring(0,
string_song.length() - 4).trim());
} else {
holder.song.setText(string_song.trim());
}
holder.singer.setText(list.get(i).getSinger().toString().trim());
// 时间转换为时分秒
int duration = list.get(i).getDuration();
String time = MusicUtils.formatTime(duration);
holder.duration.setText(time);
return view;
}
class ViewHolder {
TextView song;// 歌曲名
TextView singer;// 歌手
TextView duration;// 时长
TextView position;// 序号
}
}
service中的代码
public class MusicService extends Service {
private MediaPlayer mediaPlayer;
private Notification.Builder builder;
private static final String TAG = "MusicService";
private List<Song> listSong;
private int index;
public MusicService() {
}
@Override
public void onCreate() {
super.onCreate();
mediaPlayer = new MediaPlayer();
listSong = MusicUtils.getMusicData(this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
builder = new Notification.Builder(this);
builder.setSmallIcon(R.mipmap.ic_launcher);
//自定义广播中的布局
RemoteViews views = new RemoteViews(getPackageName(),R.layout.notifi_layout);
//第一个按钮的点击逻辑
/**
* 通过一个PendingIntent 发送一个intent.
* getBroadcast的方法是跳往广播的一个intent.
* getBroadcast的参数,1,上下文,2是请求码唯一即可,3,intent对象,4,PendingIntent的创建方式.
* setOnClickPendingIntent.这个方法可以给组件设置一个点击事件.参数:1,组件id,2pendingIntent对象
* 也就是点击以后要跳转到何方.
*/
Intent intent1 = new Intent();
intent1.setAction("com.notify.pause");
PendingIntent pendingIntent = PendingIntent.getBroadcast(this,800,intent1,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.pause,pendingIntent);
Intent intent2 = new Intent();
intent2.setAction("com.notify.restart");
PendingIntent pendingIntent2 = PendingIntent.getBroadcast(this,810,intent2,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.restart,pendingIntent2);
Intent intent3 = new Intent();
intent1.setAction("com.notify.nav");
PendingIntent pendingIntent3 = PendingIntent.getBroadcast(this,820,intent1,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.nav,pendingIntent3);
Intent intent4 = new Intent();
intent1.setAction("com.notify.next");
PendingIntent pendingIntent4 = PendingIntent.getBroadcast(this,830,intent1,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.next,pendingIntent4);
//设置通知的布局
builder.setCustomContentView(views);
//开始一个前台服务
startForeground(1,builder.build());
return super.onStartCommand(intent, flags, startId);
}
//中间人对象
public class MusicBinder extends Binder{
public void callPlay(int position){
playSong(position);
}
public void callPause(){
pause();
}
public void callPlayNextSong(){
//播放下一首
playNextSong();
}
public void callPlayNavSong(){
//播放上一首
playNavSong();
}
public void callRestart(){
restart();
}
}
private void restart() {
mediaPlayer.start();
}
private void pause() {
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();
}
}
@Override
public IBinder onBind(Intent intent) {
return new MusicBinder();
}
//播放一个歌曲
private void playSong(int position) {
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
//先重置
mediaPlayer.reset();
//取到点击歌曲文件的位置
Song song = listSong.get(position);
try {
mediaPlayer.setDataSource(song.getPath());
// mediaPlayer.prepare();
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
private void playNextSong() {
//防止索引越界
if(++index > listSong.size()-1){
index = 0;
}
playSong(index);
}
//播放上一首
private void playNavSong() {
if (--index < 0){
index = 0;
}
playSong(index);
}
public void updateNotification(){
}
}
service中通知的布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/pause"
android:text="暂停"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/restart"
android:text="继续播放"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/nav"
android:text="上一首"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/next"
android:text="下一首"
/>
广播的内容
public class MyReceiver extends BroadcastReceiver {
private static final String TAG = "MyReceiver";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.i(TAG, "onReceive: "+action);
/**
* 通知状态栏里面的广播.
* 根据通知栏里面广播的类型,来发送一个空消息.
* MainActivity接受到消息以后,根据what的值不同,
* 去调用service里面不同的播放逻辑.
*/
if (action.equals("com.notify.pause")){
MainActivity.handler.sendEmptyMessage(110);
}else if(action.equals("com.notify.restart")){
MainActivity.handler.sendEmptyMessage(120);
}else if(action.equals("com.notify.nav")){
MainActivity.handler.sendEmptyMessage(130);
}else if(action.equals("com.notify.next")){
MainActivity.handler.sendEmptyMessage(140);
}
}
}
MainActivity中的代码
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private static final String TAG = "MainActivity";
private ListView lv;
private Button pause;
private Button restart;
private Button nav;
private Button next;
private Song song;
private List<Song> listSong;
private int index;
private ServiceConnection connection;
//注意这个handler就是,广播中用到的handle.是静态的.
public static Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.i(TAG, "handleMessage:"+msg.what);
if(msg.what == 110){
binder.callPause();
}else if(msg.what == 120){
binder.callRestart();
}else if(msg.what == 130){
binder.callPlayNavSong();
}else if(msg.what == 140){
binder.callPlayNextSong();
}
}
};
public static MusicService.MusicBinder binder;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化所有组件
initView();
//动态注册广播
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.notify.pause");
intentFilter.addAction("com.notify.restart");
intentFilter.addAction("com.notify.next");
intentFilter.addAction("com.notify.nav");
MyReceiver myReceiver = new MyReceiver();
registerReceiver(myReceiver,intentFilter);
//请求授权
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
//listview的监听事件
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.i(TAG, "onItemClick: ");
binder.callPlay(position);
//根据歌曲的索引来从list中查到歌曲的位置
index = position;
}
});
//启动服务
Intent intent = new Intent(this, MusicService.class);
startService(intent);
connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
binder = (MusicService.MusicBinder)(service);
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
};
//绑定服务
bindService(intent,connection, Service.BIND_AUTO_CREATE);
}
@Override
public void onClick(View v) {
int id = v.getId();
switch (id){
case R.id.pause:
binder.callPause();
break;
case R.id.restart:
binder.callRestart();
break;
case R.id.nav:
binder.callPlayNavSong();
break;
case R.id.next:
if(++index > listSong.size() - 1){
index = 0;
}
binder.callPlayNextSong();
break;
}
}
private void initView() {
lv = findViewById(R.id.lv);
pause = findViewById(R.id.pause);
pause.setOnClickListener(this);
restart = findViewById(R.id.restart);
restart.setOnClickListener(this);
nav = findViewById(R.id.nav);
nav.setOnClickListener(this);
next = findViewById(R.id.next);
next.setOnClickListener(this);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
initAdapter();
}else{
//结束当前App
finish();
}
}
//初始化适配器
public void initAdapter(){
listSong = MusicUtils.getMusicData(this);
MyAdapter myAdapter = new MyAdapter(this, listSong);
lv.setAdapter(myAdapter);
}
@Override
protected void onDestroy() {
super.onDestroy();
if (connection != null){
unbindService(connection);
}
}
}
MainActivity中的布局
<?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:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ListView
android:id="@+id/lv"
android:layout_weight="8"
android:layout_width="match_parent"
android:layout_height="0dp">
</ListView>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="0dp">
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/pause"
android:text="暂停"
/>
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/restart"
android:text="继续播放"
/>
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/nav"
android:text="上一首"
/>
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/next"
android:text="下一首"
/>
</LinearLayout>
</LinearLayout>
listView的布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal">
<TextView
android:id="@+id/item_mymusic_postion"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBottom="@+id/item_mymusic_singer"
android:layout_gravity="center_vertical"
android:gravity="center"
android:layout_margin="10dp"
android:text="1"
android:textSize="18sp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="60dp">
<TextView
android:id="@+id/item_mymusic_song"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:ellipsize="end"
android:maxLines="1"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:text="歌曲名"
android:textSize="18sp" />
<TextView
android:id="@+id/item_mymusic_singer"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/item_mymusic_duration"
android:gravity="bottom"
android:text="歌手"
android:ellipsize="end"
android:maxLines="1"
android:layout_marginBottom="5dp"
android:textSize="16sp" />
<TextView
android:id="@+id/item_mymusic_duration"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:gravity="bottom"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:text="歌曲时间"
android:textSize="16sp" />
</RelativeLayout>
</LinearLayout>
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.service_broadcast_music">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<receiver
android:name=".broadcast.MyReceiver"
android:enabled="true"
android:exported="true"></receiver>
<service
android:name=".service.MusicService"
android:enabled="true"
android:exported="true"></service>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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