Android之Notification制作多媒体控制器

上一篇讲述了Notification的基础用法，本篇将介绍，自定义通知栏，并利用讲到的内容，实现一个简单的音乐播发器。

1.自定义通知的实现；

Notification有一个contentView属性，该属性接受的对象是RemoteView对象，用它即可实现自定义布局.

获取RemoteView对象的方法：

<span style="font-size:14px;">RemoteView remoteViews = new RemoteViews(getPackageName(),R.layout.notify_view);</span>

2.添加通知栏响应事件

Intent buttonplayIntent = new Intent("play");PendingIntent pendplayButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonplayIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.play, pendplayButtonIntent);

其中关于PendingIntent

PendingIntent用于描述Intent及其最终的行为.
你可以通过getActivity(Context context, int requestCode, Intent intent, int flags)系列方法从系统取得一个用于启动一个Activity的PendingIntent对象,
可以通过getService(Context context, int requestCode, Intent intent, int flags)方法从系统取得一个用于启动一个Service的PendingIntent对象

可以通过getBroadcast(Context context, int requestCode, Intent intent, int flags)方法从系统取得一个用于向BroadcastReceiver的Intent广播的PendingIntent对象

返回的PendingIntent可以递交给别的应用程序，然后继续处理。这里的话你可以稍后才处理PendingIntent中描述的Intent及其最终行为。

3.完整的创建自定义通知方法：

Notification mNotification;RemoteViews mRemoteViews;NotificationManager notificationManager;public void createNotifiView() {notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);mNotification = new Notification(R.drawable.ic_launcher, "MusicDemo",System.currentTimeMillis());mNotification.flags |= Notification.FLAG_ONGOING_EVENT;Intent intent = new Intent(Intent.ACTION_MAIN);intent.setClass(getApplicationContext(), MainActivity.class);PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent,PendingIntent.FLAG_CANCEL_CURRENT);mNotification.contentIntent = pendingIntent;if (mRemoteViews == null) {mRemoteViews = new RemoteViews(getPackageName(),R.layout.notify_view);}Intent buttoncloseIntent = new Intent("close");PendingIntent pendcloseButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttoncloseIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.close, pendcloseButtonIntent);Intent buttonplayIntent = new Intent("play");PendingIntent pendplayButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonplayIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.play, pendplayButtonIntent);//Intent buttonnextIntent = new Intent("next");PendingIntent pendnextButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonnextIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.next, pendnextButtonIntent);Intent buttonprewtIntent = new Intent("prew");PendingIntent pendprewButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonprewtIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.prew, pendprewButtonIntent);mRemoteViews.setTextViewText(R.id.songName, "歌曲名");if (!MainActivity.isPlay) {mRemoteViews.setImageViewResource(R.id.play,R.drawable.statusbar_btn_play);mRemoteViews.setOnClickPendingIntent(R.id.play,pendplayButtonIntent);} else {mRemoteViews.setImageViewResource(R.id.play,R.drawable.statusbar_btn_pause);mRemoteViews.setOnClickPendingIntent(R.id.play,pendplayButtonIntent);}mNotification.contentView = mRemoteViews;notificationManager.notify(0, mNotification);}

因为这里用了getBroadCast()获取PendingIntent，所以该Intent是通过发送广播来告知通知栏控件发生了触发事件。

所以，需要在响应界面过滤action,注册响应广播。

先给出通知布局文件notifiy_view:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"tools:ignore="ContentDescription" ><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="64dp"android:orientation="vertical" ><ImageViewandroid:id="@+id/icon_pic"android:layout_width="60dp"android:layout_height="60dp"android:layout_centerVertical="true" /><ImageButtonandroid:id="@+id/close"android:layout_width="30dp"android:layout_height="30dp"android:layout_alignParentRight="true"android:layout_alignParentTop="true"android:layout_marginRight="10dp"android:layout_marginTop="10dp"android:background="@drawable/status_bg"android:src="@drawable/statusbar_close" /><TextViewandroid:id="@+id/songName"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="10dp"android:layout_marginRight="5dp"android:layout_marginTop="10dp"android:layout_toLeftOf="@+id/close"android:layout_toRightOf="@+id/icon_pic"android:ellipsize="end"android:singleLine="true"android:text="歌名"android:textSize="15dp" /><ImageButtonandroid:id="@+id/prew"android:layout_width="30dp"android:layout_height="30dp"android:layout_alignParentBottom="true"android:layout_centerInParent="true"android:background="@drawable/status_bg"android:src="@drawable/statusbar_btn_prev" /><ImageButtonandroid:id="@+id/play"android:layout_width="30dp"android:layout_height="30dp"android:layout_alignTop="@+id/prew"android:layout_marginLeft="10dp"android:layout_toRightOf="@+id/prew"android:background="@drawable/status_bg"android:src="@drawable/statusbar_btn_play" /><ImageButtonandroid:id="@+id/next"android:layout_width="30dp"android:layout_height="30dp"android:layout_alignTop="@+id/prew"android:layout_marginLeft="10dp"android:layout_toRightOf="@+id/play"android:background="@drawable/status_bg"android:src="@drawable/statusbar_btn_next" /></RelativeLayout></LinearLayout>

我将会把项目放在CSDN上，大家可以下载，获取相应的资源文件

在这个小项目中，我将播放的service做为的是后台服务，然后广播也提出来了，作为一个公用的广播，如果只是做简单播放用，可以将广播放在播放界面。

项目中用到的广播：

public class MusicBroadCast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Intent musicServiceIntent = new Intent(context, MusicService.class);if (intent.getAction().equals("play")) {musicServiceIntent.putExtra(MusicService.MusicCommandKey, ""+ MusicService.MusicPlayCommand);context.startService(musicServiceIntent);} else if (intent.getAction().equals("next")) {musicServiceIntent.putExtra(MusicService.MusicCommandKey, ""+ MusicService.MusicNextCommand);context.startService(musicServiceIntent);} else if (intent.getAction().equals("prew")) {musicServiceIntent.putExtra(MusicService.MusicCommandKey, ""+ MusicService.MusicNextCommand);context.startService(musicServiceIntent);} else if (intent.getAction().equals("close")) {musicServiceIntent.putExtra(MusicService.MusicCommandKey, "");context.startService(musicServiceIntent);} else if (intent.getAction().equals("android.media.AUDIO_BECOMING_NOISY")) {// 耳机拔出事件musicServiceIntent.putExtra(MusicService.MusicCommandKey,MusicService.MusicPauseCommand+ MusicService.MusicPauseCommand);context.startService(musicServiceIntent);}}}

我这里是在service注册的广播，这个应该有点夸张了，由于项目需要全局播放，然后由通知栏也可以控制，就这样做了。

service文件代码：

package com.example.musicdemo;import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.RemoteViews;import java.io.IOException;/*** Create by gaylen on 2015/12/9 11:07*/public class MusicService extends Service {// 其他对象控制Service进行音频播放操作// 全部采用命令+命令参数的形式处理public static final int MusicInitCommand = 0;public static final int MusicPlayCommand = 10;public static final int MusicStopCommand = 20;public static final int MusicPauseCommand = 30;public static final int MusicSeekToCommand = 40;public static final int MusicNextCommand = 50;public static final int MusicPrevCommand = 60;public static final int MusicNotificationCommand = 70;// 所有的命令参数都String传递// 非String类型,采取转型处理public static String MusicCommandKey = "CtrlCommand";public static String MusicParameterKey = "CommandParameter";private MusicBroadCast broadCast;@Overridepublic void onCreate() {super.onCreate();broadCast = new MusicBroadCast();IntentFilter filter = new IntentFilter();filter.addAction("play");filter.addAction("next");filter.addAction("prew");filter.addAction("close");// 耳机filter.addAction("android.media.AUDIO_BECOMING_NOISY");// 短信// mSystemFilter.addAction("android.provider.Telephony.SMS_RECEIVED");registerReceiver(broadCast, filter);regeisterCallLisenler();/*** 为了防止通知栏点击时出现闪屏，在开启service就将一些对象实例化了*/notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);mNotification = new Notification(R.drawable.ic_launcher, "MusicDemo",System.currentTimeMillis());mNotification.flags |= Notification.FLAG_ONGOING_EVENT;Intent intent = new Intent(Intent.ACTION_MAIN);intent.setClass(getApplicationContext(), MainActivity.class);PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent,PendingIntent.FLAG_CANCEL_CURRENT);mNotification.contentIntent = pendingIntent;}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// 分析传入的命令,根据不同命令调用不同方法String commandValue = intent.getStringExtra(MusicCommandKey);if (commandValue != null) {int command = Integer.parseInt(commandValue);switch (command) {case MusicService.MusicPlayCommand:// 得到play命令对应的参数String Param = intent.getStringExtra(MusicParameterKey);// 执行doPlayCommand方法doPlayCommand(Param);break;case MusicService.MusicStopCommand:stopPlayCommand();break;case MusicService.MusicSeekToCommand:// 解析命令参数执行相关方法// 得到SeekTo的进度(字符串形式)String strProgressSet = intent.getStringExtra(MusicService.MusicParameterKey);doSeekToCommand(strProgressSet);break;case MusicService.MusicNextCommand:doNextCommand();break;case MusicService.MusicPrevCommand:doPreCommand();break;case MusicService.MusicNotificationCommand:createNotifiView();break;}}return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {super.onDestroy();// Service 被结束,则音乐停止unregisterReceiver(broadCast);}/*** 停止播放*/private void stopPlayCommand() {Log.i("play", "stop");createNotifiView();}private void doPause() {Log.i("play", "pause");}/*** 播放* * @param param*/private void doPlayCommand(String param) {if (MainActivity.isPlay) {doPause();} else {Log.i("play", "play");}createNotifiView();}// 播放下一首命令处理private void doNextCommand() {Log.i("play", "next");}// 播放上一首命令处理private void doPreCommand() {Log.i("play", "pre");}private void doSeekToCommand(String seekToValue) {int seekTo = Integer.parseInt(seekToValue);// 设置跳转进度// mMediaPlayer.seekTo(seekTo);}Notification mNotification;RemoteViews mRemoteViews;NotificationManager notificationManager;public void createNotifiView() {if (mRemoteViews == null) {mRemoteViews = new RemoteViews(getPackageName(),R.layout.notify_view);}Intent buttoncloseIntent = new Intent("close");PendingIntent pendcloseButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttoncloseIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.close, pendcloseButtonIntent);Intent buttonplayIntent = new Intent("play");PendingIntent pendplayButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonplayIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.play, pendplayButtonIntent);//Intent buttonnextIntent = new Intent("next");PendingIntent pendnextButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonnextIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.next, pendnextButtonIntent);Intent buttonprewtIntent = new Intent("prew");PendingIntent pendprewButtonIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, buttonprewtIntent, 0);mRemoteViews.setOnClickPendingIntent(R.id.prew, pendprewButtonIntent);mRemoteViews.setTextViewText(R.id.songName, "歌曲名");if (!MainActivity.isPlay) {mRemoteViews.setImageViewResource(R.id.play,R.drawable.statusbar_btn_play);mRemoteViews.setOnClickPendingIntent(R.id.play,pendplayButtonIntent);} else {mRemoteViews.setImageViewResource(R.id.play,R.drawable.statusbar_btn_pause);mRemoteViews.setOnClickPendingIntent(R.id.play,pendplayButtonIntent);}mNotification.contentView = mRemoteViews;notificationManager.notify(0, mNotification);}private AudioManager mAudioManager;public void regeisterCallLisenler() {mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);// 添加来电监听事件TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); // 获取系统服务telManager.listen(new MobliePhoneStateListener(),PhoneStateListener.LISTEN_CALL_STATE);}/*** @author wwj 电话监听器类*/private class MobliePhoneStateListener extends PhoneStateListener {@Overridepublic void onCallStateChanged(int state, String incomingNumber) {switch (state) {case TelephonyManager.CALL_STATE_IDLE: // 挂机状态// doPlayCommand("");break;case TelephonyManager.CALL_STATE_OFFHOOK: // 通话状态case TelephonyManager.CALL_STATE_RINGING: // 响铃状态Log.i("tag", "接收到来电-->");doPause();break;default:break;}}}
}

最后就是播放主界面：

public class MainActivity extends ActionBarActivity {public static boolean isPlay = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);player();}public void player() {Intent musicServiceIntent = new Intent(MainActivity.this,MusicService.class);// 设置播放控制命令:playCommandmusicServiceIntent.putExtra(MusicService.MusicCommandKey, ""+ MusicService.MusicPlayCommand);MainActivity.this.startService(musicServiceIntent);}
}

布局跟通知栏布局差不多，这里就不写了。

完整项目源码可以去：http://download.csdn.net/detail/caihuajian235/9365027下载。

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