外贸建站行业好做吗,网页平台做个业务推广,法国企业网站建设,网站建设费用计入无形资产按几年摊销通知栏notification是Android中一个很重要的组件#xff0c;可以在顶部状态栏中存在#xff0c;用户也可以通过此来操作应用#xff0c;在Android中只有3.0以上的版本才加入了notification的按钮点击功能。先看一下仿虾米写出来的通知的效果这是一个自定义的notification可以在顶部状态栏中存在用户也可以通过此来操作应用在Android中只有3.0以上的版本才加入了notification的按钮点击功能。先看一下仿虾米写出来的通知的效果这是一个自定义的notification添加了前一曲、播放、暂停、下一曲等功能自定义的notification需要自己写布局文件并通过remoteview显示在界面中。res/layout/customnotice.xml写了布局之后就需要实例化通知了1.定义一个NotificationManager对象并实例化2.定义一个RemoteViews对象3.设置RemoteViews属性private NotificationManager manager;private RemoteViews remoteViews;manager (NotificationManager) getSystemService(NOTIFICATION_SERVICE);/*** 设置通知*/SuppressLint(NewApi)private void setNotification() {NotificationCompat.Builder builder new Builder(this);Intent intent new Intent(this, MainActivity.class);// 点击跳转到主界面PendingIntent intent_go PendingIntent.getActivity(this, 5, intent,PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.notice, intent_go);// 4个参数context, requestCode, intent, flagsPendingIntent intent_close PendingIntent.getActivity(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_close, intent_close);// 设置上一曲Intent prv new Intent();prv.setAction(Constants.ACTION_PRV);PendingIntent intent_prev PendingIntent.getBroadcast(this, 1, prv,PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_prev, intent_prev);// 设置播放if (Myapp.isPlay) {Intent playorpause new Intent();playorpause.setAction(Constants.ACTION_PAUSE);PendingIntent intent_play PendingIntent.getBroadcast(this, 2,playorpause, PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_play, intent_play);}if (!Myapp.isPlay) {Intent playorpause new Intent();playorpause.setAction(Constants.ACTION_PLAY);PendingIntent intent_play PendingIntent.getBroadcast(this, 6,playorpause, PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_play, intent_play);}// 下一曲Intent next new Intent();next.setAction(Constants.ACTION_NEXT);PendingIntent intent_next PendingIntent.getBroadcast(this, 3, next,PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_next, intent_next);// 设置收藏PendingIntent intent_fav PendingIntent.getBroadcast(this, 4, intent,PendingIntent.FLAG_UPDATE_CURRENT);remoteViews.setOnClickPendingIntent(R.id.widget_fav, intent_fav);builder.setSmallIcon(R.drawable.notification_bar_icon); // 设置顶部图标Notification notify builder.build();notify.contentView remoteViews; // 设置下拉图标notify.bigContentView remoteViews; // 防止显示不完全,需要添加apisupportnotify.flags Notification.FLAG_ONGOING_EVENT;notify.icon R.drawable.notification_bar_icon;manager.notify(100, notify);}PendingIntent是一种特殊的intent设置之后并不会马上使用而是在真正点击后只会调用。Android默认使用的通知高度大概是64dp无法满足大界面的显示所以需要在其中设置bigContentView这样才能显示大图。manager.notify(id, notification)中第一个参数是一个标识码在取消通知的时候需要传入这个参数第二个就是一个notify对象。通知栏一次实例化后里面按钮的点击事件就确定了如果当前设置的是播放的按钮那么暂停是不会起作用的所以需要重新设置通知目前采用的是用Handler来更新通知栏。public Handler handler new Handler() {public void handleMessage(android.os.Message msg) {Mp3Info info (Mp3Info) msg.obj;Bitmap bitmap MediaUtil.getArtwork(getApplicationContext(),info.getId(), info.getAlbumId(), true, false);btm_album.setImageBitmap(bitmap);btm_artist.setText(info.getArtist());btm_title.setText(info.getTitle());// 播放歌曲btm_state.setImageResource(R.drawable.player_btn_radio_pause_normal);// 设置通知栏的图片文字remoteViews new RemoteViews(getPackageName(),R.layout.customnotice);remoteViews.setImageViewBitmap(R.id.widget_album, bitmap);remoteViews.setTextViewText(R.id.widget_title, info.getTitle());remoteViews.setTextViewText(R.id.widget_artist, info.getArtist());if (Myapp.isPlay) {remoteViews.setImageViewResource(R.id.widget_play, R.drawable.widget_btn_pause_normal);}else {remoteViews.setImageViewResource(R.id.widget_play, R.drawable.widget_btn_play_normal);}setNotification();};};在退出的时候需要取消通知栏用NotificationManager的manager对象取消通知view其中的100是notify设置的id用来区别通知因为在其他应用中可能会产生好多通知。Overrideprotected void onDestroy() {Log.i(---TAG, ondestory);super.onDestroy();if (remoteViews ! null) {manager.cancel(100);}if (receiver ! null) {unregisterReceiver(receiver);}}
