• 在service中播放音乐


    MainActivity:

    public class MainActivity extends Activity {
        private MyReceiver receiver;
        private Button btnStartOrPause;
        private String receiverAction = "com.pepelu.musicplayer";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        
            // 动态注册广播,不需要再在Manifest中注册
            receiver = new MyReceiver();
            IntentFilter filter = new IntentFilter(receiverAction);
            registerReceiver(receiver, filter);
            // button
            btnStartOrPause = (Button) findViewById(R.id.button1);
        }
    
        public void clickHandle(View view) {
            int id = view.getId();
            if (id == R.id.button1) {//播放,暂停
                Intent intent = new Intent(this, MusicPlayerService.class);
                Bundle bundle = new Bundle();
                File file = new File(Environment.getExternalStorageDirectory(), "残酷天使.mp3");
                bundle.putString("audioPath", file.getPath());
                bundle.putString("receiverAction", receiverAction);
                intent.putExtras(bundle);
                startService(intent);
            } else if (id == R.id.button2) {//停止
                Intent intent = new Intent(this, MusicPlayerService.class);
                stopService(intent);
            }
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            // 解除注册
            unregisterReceiver(receiver);
        }
    
        public class MyReceiver extends BroadcastReceiver {
            /**
             * 更新UI
             */
            @Override
            public void onReceive(Context context, Intent intent) {
    //            String name = intent.getStringExtra("name");
    //            Toast.makeText(context, name, Toast.LENGTH_SHORT).show();
    //            btnStartOrPause.setText("暂停");
                int backFlag=intent.getIntExtra("backFlag", 0);
                switch (backFlag) {
                case 0:
                    btnStartOrPause.setText("暂停");
                    break;
                case 1:
                case 2:
                case 3:
                    btnStartOrPause.setText("播放");
                    break;
                default:
                    break;
                }
            }
    
        }
    }

    Service:

    public class MusicPlayerService extends Service {
        private MediaPlayer player;
        private Intent mIntent;
        private Bundle bundle;
        private String audioPath;
        private String receiverAction;
    
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }
    
        @Override
        public void onCreate() {
            super.onCreate();
    
        }
    
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {
            // super.onStartCommand(intent, flags, startId);
            if (mIntent == null) {
                mIntent = intent;
            }
            audioPath = mIntent.getExtras().getString("audioPath");
            receiverAction = mIntent.getExtras().getString("receiverAction");
            // 正在播放
            if (player != null && player.isPlaying()) {
                player.pause();
                sendBC4UpdateUI(1);
            } else {
                // 第一次播放
                if (player == null) {
                    player = new MediaPlayer();
                    try {
                        player.setDataSource(audioPath);
                        player.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        player.prepare();
                    } catch (IllegalArgumentException e) {
                        e.printStackTrace();
                    } catch (SecurityException e) {
                        e.printStackTrace();
                    } catch (IllegalStateException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                // 异步缓冲
                // player.prepareAsync();
                // player.setOnPreparedListener(new OnPreparedListener() {
                // @Override
                // public void onPrepared(MediaPlayer mp) {
                // player.start();
                // }
                // });
                //开始播放
                player.start();
                sendBC4UpdateUI(0);
                //一曲播放结束
                player.setOnCompletionListener(new OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        //播放器重置
                        player.reset();
                        player = null;
                        sendBC4UpdateUI(3);
                    }
                });
            }
            return START_STICKY;
    
        }
    
        @Override
        public void onDestroy() {
            // 释放掉player资源
            if (player != null) {
                player.release();
                sendBC4UpdateUI(2);
            }
            super.onDestroy();
        }
    
        /**
         * 更新界面
         * 
         * @param flag
         */
        private void sendBC4UpdateUI(int flag) {
            Intent intent = new Intent(receiverAction);
            // 如果缺少下面这句,关掉再重新打开播放器里点“停止”并不能停掉
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            bundle = new Bundle();
            bundle.putInt("backFlag", flag);
            intent.putExtras(bundle);
            sendBroadcast(intent);
        }
    }

    布局文件:

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.pepelu.musicplayer.MainActivity" >
    
        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="clickHandle"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginTop="16dp"
            android:text="播放" />
    
        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="clickHandle"
            android:layout_alignBaseline="@+id/button1"
            android:layout_alignBottom="@+id/button1"
            android:layout_marginLeft="52dp"
            android:layout_toRightOf="@+id/button1"
            android:text="停止" />
    
    </RelativeLayout>
    View Code

    Manifest:

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.pepelu.musicplayer"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk
            android:minSdkVersion="14"
            android:targetSdkVersion="21" />
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    
        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name=".MainActivity"
                android:label="@string/app_name" >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
    
            <service android:name="com.pepelu.musicplayer.service.MusicPlayerService" >
            </service>
    
           
        </application>
    
    </manifest>
    View Code

    参考博客:

    简易mp3播放器 :http://blog.csdn.net/ouyang_peng/article/details/8777709

    使用service播放MP3:http://www.cnblogs.com/giuz/archive/2010/10/31/1865470.html

    service的使用:http://segmentfault.com/a/1190000000507084

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  • 原文地址:https://www.cnblogs.com/mada0/p/4862147.html
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