NotificationChannel是android8.0新增的特性,如果App的targetSDKVersion>=26,没有设置channel通知渠道的话,就会导致通知无法展示。
Android O 引入了 通知渠道(Notification Channels),以提供统一的系统来帮助用户管理通知,如果是针对 android O 为目标平台时,必须实现一个或者多个通知渠道,以向用户显示通知。比如聊天软件,为每个聊天组设置一个通知渠道,指定特定声音、灯光等配置。
创建NotificationChannel
private NotificationManager getNotificationManager() { if (mNotificationManager == null) { mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); } return mNotificationManager; }
@NonNull private NotificationCompat.Builder getNotificationBuilder() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { NotificationChannel channel = new NotificationChannel("channel_id", "channel_name", NotificationManager.IMPORTANCE_DEFAULT); //是否绕过请勿打扰模式 channel.canBypassDnd(); //闪光灯 channel.enableLights(true); //锁屏显示通知 channel.setLockscreenVisibility(VISIBILITY_SECRET); //闪关灯的灯光颜色 channel.setLightColor(Color.RED); //桌面launcher的消息角标 channel.canShowBadge(); //是否允许震动 channel.enableVibration(true); //获取系统通知响铃声音的配置 channel.getAudioAttributes(); //获取通知取到组 channel.getGroup(); //设置可绕过 请勿打扰模式 channel.setBypassDnd(true); //设置震动模式 channel.setVibrationPattern(new long[]{100, 100, 200}); //是否会有灯光 channel.shouldShowLights(); getNotificationManager().createNotificationChannel(channel); } NotificationCompat.Builder notification = new NotificationCompat.Builder(this, "channel_id"); notification.setContentTitle("新消息来了"); notification.setContentText("周末到了,不用上班了"); notification.setSmallIcon(R.mipmap.ic_launcher); notification.setAutoCancel(true); return notification; }
builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);
Android 8.0 及以上是使用NotificationManager.IMPORTANCE_,Android 7.1 及以下是使用NotificationCompat.PRIORITY_它们都是定义的常量;下面我们以表格的形式更好的展示出来。
用户通知级别 | Android8.0及以上 | Android7.0及以下 |
---|---|---|
紧急级别(发出通知声音并显示为提示通知) | IMPORTANCE_HIGH | PRIORITY_HIGH或者PRIORITY_MAX |
高级别(发出通知声音并且通知栏有通知) | IMPORTANCE_DEFAULT | PRIORITY_DEFAULT |
中等级别(没有通知声音但通知栏有通知) | IMPORTANCE_LOW | PRIORITY_LOW |
低级别(没有通知声音也不会出现在状态栏上) | IMPORTANCE_MIN | PRIORITY_MIN |
上面这些通知级别用户都是可以在 Channel 设置中更改
private void sendCustomNotification() { NotificationCompat.Builder builder = getNotificationBuilder(); RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.layout_custom_notifition); remoteViews.setTextViewText(R.id.notification_title, "custom_title"); remoteViews.setTextViewText(R.id.notification_content, "custom_content"); Intent intent = new Intent(this, MainActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, -1, intent, PendingIntent.FLAG_UPDATE_CURRENT); remoteViews.setOnClickPendingIntent(R.id.turn_next, pendingIntent); builder.setCustomContentView(remoteViews); getNotificationManager().notify(3, builder.build()); }
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/notification_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="通知栏标题" android:textSize="24sp"/> <TextView android:id="@+id/notification_content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="通知栏内容"/> </LinearLayout> <Button android:id="@+id/turn_next" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:text="跳转"/></RelativeLayout>
public class NotificationUtils extends ContextWrapper { public static final String CHANNEL_ID = "default"; private static final String CHANNEL_NAME = "Default Channel"; private static final String CHANNEL_DESCRIPTION = "this is default channel!"; private NotificationManager mManager; public NotificationUtils(Context base) { super(base); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { createNotificationChannel(); } } @TargetApi(Build.VERSION_CODES.O) private void createNotificationChannel() { NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT); //是否绕过请勿打扰模式 channel.canBypassDnd(); //闪光灯 channel.enableLights(true); //锁屏显示通知 channel.setLockscreenVisibility(VISIBILITY_SECRET); //闪关灯的灯光颜色 channel.setLightColor(Color.RED); //桌面launcher的消息角标 channel.canShowBadge(); //是否允许震动 channel.enableVibration(true); //获取系统通知响铃声音的配置 channel.getAudioAttributes(); //获取通知取到组 channel.getGroup(); //设置可绕过 请勿打扰模式 channel.setBypassDnd(true); //设置震动模式 channel.setVibrationPattern(new long[]{100, 100, 200}); //是否会有灯光 channel.shouldShowLights(); getManager().createNotificationChannel(channel); } private NotificationManager getManager() { if (mManager == null) { mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); } return mManager; } /** * 发送通知 */ public void sendNotification(String title, String content) { NotificationCompat.Builder builder = getNotification(title, content); getManager().notify(1, builder.build()); } private NotificationCompat.Builder getNotification(String title, String content) { NotificationCompat.Builder builder = null; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { builder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID); } else { builder = new NotificationCompat.Builder(getApplicationContext()); builder.setPriority(PRIORITY_DEFAULT); } //标题 builder.setContentTitle(title); //文本内容 builder.setContentText(content); //小图标 builder.setSmallIcon(R.mipmap.ic_launcher); //设置点击信息后自动清除通知 builder.setAutoCancel(true); return builder; } /** * 发送通知 */ public void sendNotification(int notifyId, String title, String content) { NotificationCompat.Builder builder = getNotification(title, content); getManager().notify(notifyId, builder.build()); } /** * 发送带有进度的通知 */ public void sendNotificationProgress(String title, String content, int progress, PendingIntent intent) { NotificationCompat.Builder builder = getNotificationProgress(title, content, progress, intent); getManager().notify(0, builder.build()); } /** * 获取带有进度的Notification */ private NotificationCompat.Builder getNotificationProgress(String title, String content, int progress, PendingIntent intent) { NotificationCompat.Builder builder = null; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { builder = new NotificationCompat.Builder(getApplicationContext(), CHANNEL_ID); } else { builder = new NotificationCompat.Builder(getApplicationContext()); builder.setPriority(PRIORITY_DEFAULT); } //标题 builder.setContentTitle(title); //文本内容 builder.setContentText(content); //小图标 builder.setSmallIcon(R.mipmap.ic_launcher); //设置大图标,未设置时使用小图标代替,拉下通知栏显示的那个图标 //设置大图片 BitmpFactory.decodeResource(Resource res,int id) 根据给定的资源Id解析成位图 builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher)); if (progress > 0 && progress < 100) { //一种是有进度刻度的(false),一种是循环流动的(true) //设置为false,表示刻度,设置为true,表示流动 builder.setProgress(100, progress, false); } else { //0,0,false,可以将进度条隐藏 builder.setProgress(0, 0, false); builder.setContentText("下载完成"); } //设置点击信息后自动清除通知 builder.setAutoCancel(true); //通知的时间 builder.setWhen(System.currentTimeMillis()); //设置点击信息后的跳转(意图) builder.setContentIntent(intent); return builder; }}
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