Android Notification通知栏的必备姿势

android开发，可能经常使用到通知管理者，在手机顶部显示通知。封装一些常用的方法，可以减少代码冗余。通常情况下，显示下载进度，播放器通知栏操作，显示APP状态信息，发送友情提示等，都需要用到Notification。

一，直接贴代码，直观了解通知栏。

/** * Created by duqian on 16/01/23. * Android通知栏封装 */public class NotificationUtils {    private static final int SmallIcon = R.drawable.ic_launcher;    public static final int NotificationNumber = 1;    private static NotificationManager mManager;    private static NotificationCompat.Builder mBuilder;    private static final Random RANDOM = new Random();    /**     * 获取Builder     */    public static NotificationCompat.Builder getBuilder(Context context) {        mBuilder = new NotificationCompat.Builder(context);        mBuilder.setNumber(NotificationNumber)                .setWhen(System.currentTimeMillis())                .setPriority(Notification.PRIORITY_DEFAULT)                .setAutoCancel(true);              //.setDefaults(Notification.DEFAULT_VIBRATE);        return mBuilder;    }    /**     * 获取NotificationManager     */    public static NotificationManager getManager(Context context) {        if (mManager == null) {            synchronized (NotificationUtils.class) {                if (mManager == null) {                    mManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);                }            }        }        return mManager;    }    /**     * 显示普通的通知     */    public static void showOrdinaryNotification(Context context, String title, String text, String ticker,                                                int icon, int channel) {        mBuilder = getBuilder(context);        mManager = getManager(context);        mBuilder.setContentTitle(title)                .setContentText(text)                .setContentIntent(getDefalutIntent(context, Notification.FLAG_AUTO_CANCEL))                .setNumber(NotificationNumber)//显示数量                .setTicker(ticker)//通知首次出现在通知栏，带上升动画效果的，可设置文字，图标                .setWhen(System.currentTimeMillis())//通知产生的时间                .setPriority(Notification.PRIORITY_DEFAULT)//设置该通知优先级                .setAutoCancel(true)//设置让通知将自动取消                .setOngoing(false)//ture，设置他为一个正在进行的通知。如一个文件下载,网络连接。                .setDefaults(Notification.DEFAULT_SOUND)//向通知添加声音、闪灯和振动效果。最简单、最一致的方式是使用当前的用户默认设置，使用defaults属性，可以组合：                        //Notification.DEFAULT_ALL  Notification.DEFAULT_SOUND 添加声音 //DEFAULT_VIBRATE requires VIBRATE permission                .setSmallIcon(SmallIcon)        ;        Notification mNotification = mBuilder.build();        mNotification.icon = icon;        mManager.notify(dealWithId(channel), mNotification);    }    //获取默认的延期意图    public static PendingIntent getDefalutIntent(Context context, int flags) {        PendingIntent pendingIntent = PendingIntent.getActivity(context, 1, new Intent(), flags);        return pendingIntent;    }    //通知channel ID，唯一标示一个通知    public static int dealWithId(int channel) {        return channel >= 1 && channel <= 100 ? channel : RANDOM.nextInt(Integer.MAX_VALUE - 100) + 101;    }    //获取系统SDK版本    public static int getSystemVersion() {        int version = android.os.Build.VERSION.SDK_INT;        return version;    }    /**     * 清除所有的通知     * @param context     */    public static void clearAllNotifification(Context context) {        mManager = getManager(context);        mManager.cancelAll();    }    /**     * 清除通知     */    public static void clearNotifificationById(Context context, int channel）{        mManager = getManager(context);        mManager.cancel(dealWithId(channel));    }    private static int iconId = 0;    public void setIconId(int iconId){        this.iconId=iconId;    }    /**     * 默认图标     */    private static int getPushIconId(Context context) {        if(iconId==0)        {            iconId = context.getApplicationInfo().icon;        }        if (iconId < 0) {            iconId = android.R.drawable.sym_def_app_icon;        }        return iconId;    }    //去通知文本的前15位字符    private  static String getSubStringTitle(String desc) {        if (desc != null && !"".equals(desc) && desc.length() > 15) {            return desc.substring(0, 15);        } else {            return desc;        }    } ｝/**     * 显示进度的通知栏     */    public static void showProgressNotification(Context context, String title, String text, String ticker,                                                Intent resultIntent, boolean indeterminate, int progress,                                                int icon, int channel) {        mBuilder = getBuilder(context);        mManager = getManager(context);        PendingIntent pendingIntent = PendingIntent.getActivity(context, RequestCode, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);        mBuilder.setContentTitle(ticker)//ticker,title                .setContentText(text)                .setTicker(ticker)                .setSmallIcon(SmallIcon)                .setContentIntent(pendingIntent);        if (indeterminate) {            //不确定进度的 设置为true就是不确定的那种进度条效果            mBuilder.setProgress(0, 0, true).setOngoing(false).setAutoCancel(true);        } else {            //确定进度的            mBuilder.setProgress(100, progress, false).setOngoing(true);        }        Notification progressNotification = mBuilder.build();        progressNotification.icon = icon;        mManager.notify(dealWithId(channel), progressNotification);    } /**     * 带意图的通知栏：Intent 中可以包含很多参数、功能     * 应用场景：页面启动、跳转、安装apk     */    public static void showIntentNotification(Context context, String title, String text, String ticker,                                              Intent resultIntent, int icon, int channel,int defaults) {        mBuilder = getBuilder(context);        mManager = getManager(context);        PendingIntent pendingIntent = PendingIntent.getActivity(context, RequestCode, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);        mBuilder.setContentTitle(title)                .setContentText(text)                .setTicker(ticker)                .setSmallIcon(SmallIcon)                .setContentIntent(pendingIntent);        if (defaults>0){            mBuilder.setDefaults(Notification.DEFAULT_SOUND);        }        Notification mNotification = mBuilder.build();        mNotification.icon = icon;        mManager.notify(dealWithId(channel), mNotification);    }

二，如何调用呢？

    //提示存储空间不足，跳转到某个页面    private void notifyNotEnoughSpace(Context context) {        String title = context.getString(R.string.error_sdcard_storage_full);        String text = context.getString(R.string.buy_oair_device);        String ticker = title;        Intent resultIntent = new Intent(context,SimpleWebActivity.class);        resultIntent.putExtra(MyConstant.intent_plugin_url,OairApi.oair_buy_product);        resultIntent.putExtra(MyConstant.intent_plugin_name, context.getString(R.string.webview_oair_title));        resultIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);        NotificationUtils.showIntentNotification(context, title,text, ticker, resultIntent, R.drawable.ic_launcher, channel_download_ocloud,Notification.DEFAULT_ALL);//Notification.DEFAULT_SOUND        //NotificationUtils.showOrdinaryNotification(context, title,text, ticker,R.drawable.logo_statusbar,channel_download_ocloud);        //ToastUtils.showCenterToast(context,title+","+text);    }

三，自定义通知View

以上通知栏，图标，位置随手机系统规格来。我们也可以自定义通知栏的布局。通过引入xml中定义好的布局，然后更新通知栏的UI。

//显示应用有更新的通知，显示下载进度，下载完成点击后可以安装或其他操作    private void showNotifycation(Context context) {        String title = context.getString(R.string.notify_download_apk);        String text = context.getString(R.string.notify_click_apk_download);        String ticker = title;        Notification n = new Notification(R.drawable.ic_launcher,ticker, System.currentTimeMillis());        Intent clickIntent = new Intent();        clickIntent.setAction(BroadcastUtils.ACTION_NOTIFICATION);        clickIntent.putExtra(BroadcastUtils.CATEGORY,BroadcastUtils.category_apk_download_install);        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, clickIntent, PendingIntent.FLAG_UPDATE_CURRENT);        n.setLatestEventInfo(context, title, text, pendingIntent);        n.flags |= Notification.FLAG_AUTO_CANCEL; //点击一次后自动消除        final int hours = new Date().getHours();        LogUtils.debug(TAG,"hours="+hours);        if (hours>=8&&hours<=24) {            n.defaults = Notification.DEFAULT_ALL;        }        NotificationManager nm = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);        nm.notify(channel_download_apk, n);    }

通过代码可以看出，Notification的使用姿势还是比较简单的，而且通用，暂时没有兼容性问题。我自己用的挺好，是否优雅，自己验证哈。
未完待续，Dusan，Q291902259，欢迎交流。

一，直接贴代码，直观了解通知栏。

二，如何调用呢？

三，自定义通知View

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