做实验的时候使用Service和broadcast实现了一个功能较为简单的音乐播放器,可以对音乐进行播放、暂停和停止。
主要思路:
1、使用Service在后台播放音乐
2、broadcast发送广播通知Activity更改界面
程序运行界面:
1、布局界面XML如下
<?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" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:orIEntation="vertical"> <androIDx.appcompat.Widget.Toolbar androID:ID="@+ID/musicbar" androID:layout_wIDth="match_parent" androID:layout_height="60dp" androID:background="?attr/colorPrimary" androID:minHeight="?attr/actionbarSize" androID:theme="?attr/actionbartheme" app:navigationIcon="@drawable/logo" app:TitleTextcolor="@color/white" /> <VIEw androID:ID="@+ID/vIEw" androID:layout_wIDth="match_parent" androID:layout_height="100dp" /> <ImageVIEw androID:ID="@+ID/photo" androID:layout_wIDth="250dp" androID:layout_height="250dp" androID:layout_gravity="center" androID:layout_marginBottom="20dp" app:srcCompat="@drawable/qIElogo" /> <TextVIEw androID:ID="@+ID/musictext" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_gravity="center" androID:layout_marginBottom="100dp" androID:text="暂无播放音乐" androID:textSize="28dp" /> <linearLayout androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:background="@color/white" androID:orIEntation="horizontal"> <Imagebutton androID:ID="@+ID/start" androID:layout_wIDth="90dp" androID:layout_height="90dp" androID:layout_weight="1" androID:background="@color/white" androID:scaleType="centerInsIDe" app:srcCompat="@drawable/start" /> <Imagebutton androID:ID="@+ID/stop" androID:layout_wIDth="90dp" androID:layout_height="90dp" androID:layout_weight="1" androID:background="@color/white" androID:scaleType="centerInsIDe" app:srcCompat="@drawable/stop" /> </linearLayout></linearLayout>
2、主Acitivy如下
package com.example.test6;import androIDx.appcompat.app.AppCompatActivity;import androID.content.broadcastReceiver;import androID.content.Context;import androID.content.Intent;import androID.content.IntentFilter;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.Imagebutton;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;public class Music extends AppCompatActivity { TextVIEw musictext; ImageVIEw photo; Imagebutton startbutton; Integer state = 2; @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_music); IntentFilter inf = new IntentFilter(); inf.addAction("com.user.action"); registerReceiver(broad,inf); musictext = findVIEwByID(R.ID.musictext); photo = findVIEwByID(R.ID.photo); startbutton = findVIEwByID(R.ID.start); Imagebutton stopbutton = findVIEwByID(R.ID.stop); startbutton.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { switch (state){ case 1: state = 2; break; default: state = 1; break; } Log.v("当前状态","1"); Intent intent = new Intent(Music.this,MusicService.class); intent.putExtra("action",state); startService(intent); Log.v("intent传值","1"); } }); stopbutton.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { Intent intent = new Intent(Music.this,MusicService.class); stopService(intent); } }); } @OverrIDe protected voID onDestroy() { super.onDestroy(); unregisterReceiver(broad); } public broadcastReceiver broad = new broadcastReceiver() { @OverrIDe public voID onReceive(Context context, Intent intent) { int i = intent.getIntExtra("action",-1); switch(i){ case 1: musictext.setText("China-X"); photo.setimageResource(R.drawable.yjtp); startbutton.setimageResource(R.drawable.pause); break; case 2: startbutton.setimageResource(R.drawable.start); musictext.setText("音乐暂停"); break; case 3: state = 3; musictext.setText("暂无播放音乐"); photo.setimageResource(R.drawable.qIElogo); startbutton.setimageResource(R.drawable.start); break; } } };}
3、Service类如下
package com.example.test6;import androID.app.Service;import androID.content.Intent;import androID.media.MediaPlayer;import androID.os.IBinder;import androID.util.Log;public class MusicService extends Service { public IBinder onBind(Intent intent){ return null; } private MediaPlayer mp; public voID onCreate(){ super.onCreate(); } public voID onStart(Intent intent,int startID){ super.onStart(intent,startID); int i = intent.getIntExtra("action",0); if(i==1){ if(null==mp) { mp = MediaPlayer.create(this, R.raw.mymusic); mp.setonCompletionListener(new MediaPlayer.OnCompletionListener() { @OverrIDe public voID onCompletion(MediaPlayer mp) { stopSelf(); } }); } mp.start(); }else if(i==2){ if(mp!=null&&mp.isPlaying()){ mp.pause(); } } Log.v("zhuangtai",String.valueOf(i)); Intent in = new Intent("com.user.action"); in.putExtra("action",i); sendbroadcast(in); } public voID onDestroy(){ super.onDestroy(); mp.stop(); Intent in = new Intent("com.user.action"); in.putExtra("action",3); sendbroadcast(in); }}
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