添加localNotificationCompat依赖v4 25版本，兼容8.0

library/src/main/java/android/support/v4/app/LocalNotificationCompat.java

@@ -0,0 +1,62 @@
+package android.support.v4.app;
+
+import android.app.Notification;
+import android.content.Context;
+import android.support.annotation.NonNull;
+
+import java.util.ArrayList;
+
+/**
+ * Created by ucmed on 2018/3/8.
+ */
+public class LocalNotificationCompat extends NotificationCompat {
+    public static class Builder extends NotificationCompat.Builder{
+        String mChannelId;
+        /**
+         * Constructor.
+         *
+         * Automatically sets the when field to {@link System#currentTimeMillis()
+         * System.currentTimeMillis()} and the audio stream to the
+         * {@link Notification#STREAM_DEFAULT}.
+         *
+         * @param context A {@link Context} that will be used to construct the
+         *      RemoteViews. The Context will not be held past the lifetime of this
+         *      Builder object.
+         * @param channelId The constructed Notification will be posted on this
+         *      NotificationChannel.
+         */
+        public Builder(@NonNull Context context, @NonNull String channelId) {
+            super(context);
+            mContext = context;
+            mChannelId = channelId;
+
+            // Set defaults to match the defaults of a Notification
+            mNotification.when = System.currentTimeMillis();
+            mNotification.audioStreamType = Notification.STREAM_DEFAULT;
+            mPriority = PRIORITY_DEFAULT;
+            mPeople = new ArrayList<String>();
+        }
+
+        /**
+         * @deprecated use {@link #LocalNotificationCompat.Builder(Context,String)} instead.
+         * All posted Notifications must specify a NotificationChannel Id.
+         */
+        @Deprecated
+        public Builder(Context context) {
+            this(context, null);
+        }
+
+
+        /**
+         * Specifies the channel the notification should be delivered on.
+         *
+         * No-op on versions prior to {@link android.os.Build.VERSION_CODES#O} .
+         */
+        public Builder setChannelId(@NonNull String channelId) {
+            mChannelId = channelId;
+            return this;
+        }
+    }
+
+
+}

library/src/main/java/me/shenfan/updateapp/UpdateService.java

@@ -20,7 +20,7 @@
 import android.os.Environment;
 import android.os.IBinder;
 import android.support.annotation.Nullable;
-import android.support.v4.app.NotificationCompat;
+import android.support.v4.app.LocalNotificationCompat;
 import android.support.v4.content.FileProvider;
 import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
@@ -94,7 +94,7 @@ public void setUpdateProgressListener(UpdateProgressListener listener) {
 
     private boolean startDownload;//开始下载
     private int lastProgressNumber;
-    private NotificationCompat.Builder builder;
+    private LocalNotificationCompat.Builder builder;
     private NotificationManager manager;
     private int notifyId;
     private String appName;
@@ -277,7 +277,7 @@ private void sendLocalBroadcast(int status, int progress) {
     @TargetApi(26)
     private void buildNotification() {
         manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
-        builder = new NotificationCompat.Builder(this);
+        builder = new LocalNotificationCompat.Builder(this);
         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
             CharSequence name = "update_channel";
             String Description = "zhuojian update channel";
@@ -302,6 +302,7 @@ private void buildNotification() {
         manager.notify(notifyId, builder.build());
     }
 
+
     private void start() {
         builder.setContentTitle(appName);
         builder.setContentText(getString(R.string.update_app_model_progress, 1, "%"));