通知与自定义通知

奥利奥添加了通知渠道

系统默认通知

Notification

NotificationManager

private final String CHANNEL_ID="channelId_1";
private final String CHANNEL_NAME="channelName_1";
NotificationCompat.Builder builder=new NotificationCompat.Builder(this,channelId);
Notification notification=builder
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setWhen(System.currentTimeMillis())
                            .setContentTitle("title")
                            .setContentText("content")
                            .setCustomContentView(remoteViews)
                            .setChannelId(channelId)
                            .build();
NotificationManager manager= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
manager.createNotificationChannel(new NotificationChannel(channelId,channelName,NotificationManager.IMPORTANCE_DEFAULT));
manager.notify(0,notification);

在Android Version >= 26时需要加入渠道，否则无法弹出通知：

manager.createNotificationChannel(new NotificationChannel(channelId,channelName,NotificationManager.IMPORTANCE_DEFAULT));

NotificationChannel(String id, CharSequence name, int importance)

id为渠道Id，name为渠道名称，importance为通知优先级，分为以下几个：

1. IMPORTANCE_UNSPECIFIED
2. IMPORTANCE_NONE
3. IMPORTANCE_MIN
4. IMPORTANCE_LOW
5. IMPORTANCE_DEFAULT
6. IMPORTANCE_HIGH

当创建不同渠道的通知时会将通知如下分类：

public void notify (int id, Notification notification)

id为通知ID，是该app中该通知的唯一标识，即id相同则代表同一个通知，不弹出新通知

对于其它丰富通知功能的方法，参照Notification.Builder中的方法

自定义通知

RemoteViews

RemoteViews remoteViews=new RemoteViews(getPackageName(),R.layout.view_notification);
remoteViews.setTextColor(R.id.text_notify_custom,getResources().getColor(R.color.colorAccent,null));
PendingIntent pendingIntent=PendingIntent.getActivity(this,0,new Intent(this,TestActivity.class),PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.butt_notify_custom,pendingIntent);
Notification notification=builder
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setWhen(System.currentTimeMillis())
                            .setContentTitle("title")
                            .setContentText("content")
                            .setCustomContentView(remoteViews)
                            .setChannelId(channelId)
                            .build();

setCustomContentView(remoteViews)

view_notification.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:orientation="horizontal">
    <Button
        android:id="@+id/butt_notify_custom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:text="跳转"/>
    <TextView
        android:id="@+id/text_notify_custom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自定义通知"/>
</LinearLayout>

坑

这里有一个大坑，那就是自定义通知视图的布局不能是约束布局，否则报错!!!

Android 8.0及以上的操作系统需要添加通知渠道才能弹出通知否则无效！