Merge "support framework logging for slices" into pi-dev

api/current.txt

@@ -7281,6 +7281,13 @@ package android.app.slice {
     field public static final java.lang.String SLICE_METADATA_KEY = "android.metadata.SLICE_URI";
   }
 
+  public class SliceMetrics {
+    ctor public SliceMetrics(android.content.Context, android.net.Uri);
+    method public void logHidden();
+    method public void logTouch(android.net.Uri);
+    method public void logVisible();
+  }
+
   public abstract class SliceProvider extends android.content.ContentProvider {
     ctor public SliceProvider();
     method public final int delete(android.net.Uri, java.lang.String, java.lang.String[]);

core/java/android/app/slice/SliceMetrics.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2018 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 android.app.slice;
+
+import android.annotation.NonNull;
+import android.content.Context;
+import android.net.Uri;
+
+import com.android.internal.logging.MetricsLogger;
+
+/**
+ * Metrics interface for slices.
+ *
+ * This is called by SliceView, so Slice develoers should
+ * not need to reference this class.
+ *
+ * @see androidx.slice.widget.SliceView
+ */
+public class SliceMetrics {
+
+    private static final String TAG = "SliceMetrics";
+    private MetricsLogger mMetricsLogger;
+
+    /**
+     * An object to be used throughout the life of a slice to register events.
+     */
+    public SliceMetrics(@NonNull Context context, @NonNull Uri uri) {
+        mMetricsLogger = new MetricsLogger();
+    }
+
+    /**
+     * To be called whenever the slice becomes visible to the user.
+     */
+    public void logVisible() {
+    }
+
+    /**
+     * To be called whenever the slice becomes invisible to the user.
+     */
+    public void logHidden() {
+    }
+
+    /**
+     * To be called whenever the use interacts with a slice.
+     *@param subSlice The URI of the sub-slice that is the subject of the interaction.
+     */
+    public void logTouch(@NonNull Uri subSlice) {
+    }
+}