Introduce a WifiTrackerLibProvider.

This make the WifiTrackerLib can be customized.

Bug: 149540986
Test: manual test wifi picker, and atest com.android.settings
Change-Id: I1418ae39c895ce2ff87f18005a226a4835f9e083

src/com/android/settings/wifi/WifiTrackerLibProvider.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi;
+
+import android.content.Context;
+import android.os.Handler;
+
+import androidx.lifecycle.Lifecycle;
+
+import com.android.wifitrackerlib.NetworkDetailsTracker;
+import com.android.wifitrackerlib.WifiPickerTracker;
+
+import java.time.Clock;
+
+/**
+ * Provides the objects instances from the AOSP WifiTrackerLib.
+ */
+public interface WifiTrackerLibProvider {
+
+    /** Create a new instance of WifiPickerTracker */
+    WifiPickerTracker createWifiPickerTracker(
+            Lifecycle lifecycle, Context context,
+            Handler mainHandler, Handler workerHandler, Clock clock,
+            long maxScanAgeMillis, long scanIntervalMillis,
+            WifiPickerTracker.WifiPickerTrackerCallback listener);
+
+    /** Create a new instance of NetworkDetailsTracker */
+    NetworkDetailsTracker createNetworkDetailsTracker(
+            Lifecycle lifecycle, Context context,
+            Handler mainHandler, Handler workerHandler, Clock clock,
+            long maxScanAgeMillis, long scanIntervalMillis,
+            String key);
+
+}