[SP23] Address misc API review comment about NetworkStats

This change add several javadoc for NetworkStats and its Entry
class. Also remove IFACE_ALL constant accordlingly.

Test: atest FrameworkNetTests
Test: m doc-comment-check-docs
Bug: 148895143
Change-Id: Id1b8f41be79f847ad73197ff0e18258b6ee8a730

core/java/android/net/NetworkStats.java

@@ -21,7 +21,6 @@ import static android.os.Process.CLAT_UID;
 import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
-import android.annotation.SuppressLint;
 import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.os.Parcel;
@@ -58,9 +57,12 @@ import java.util.function.Predicate;
 public final class NetworkStats implements Parcelable {
     private static final String TAG = "NetworkStats";
 
-    /** {@link #iface} value when interface details unavailable. */
+    /**
-    @SuppressLint("CompileTimeConstant")
+     * {@link #iface} value when interface details unavailable.
+     * @hide
+     */
     @Nullable public static final String IFACE_ALL = null;
+
     /**
      * Virtual network interface for video telephony. This is for VT data usage counting
      * purpose.
@@ -248,7 +250,13 @@ public final class NetworkStats implements Parcelable {
     @UnsupportedAppUsage
     private long[] operations;
 
-    /** @hide */
+    /**
+     * Basic element of network statistics. Contains the number of packets and number of bytes
+     * transferred on both directions in a given set of conditions. See
+     * {@link Entry#Entry(String, int, int, int, int, int, int, long, long, long, long, long)}.
+     *
+     * @hide
+     */
     @SystemApi
     public static class Entry {
         /** @hide */
@@ -319,6 +327,35 @@ public final class NetworkStats implements Parcelable {
                     rxBytes, rxPackets, txBytes, txPackets, operations);
         }
 
+        /**
+         * Construct a {@link Entry} object by giving statistics of packet and byte transferred on
+         * both direction, and associated with a set of given conditions.
+         *
+         * @param iface interface name of this {@link Entry}. Or null if not specified.
+         * @param uid uid of this {@link Entry}. {@link #UID_TETHERING} if this {@link Entry} is
+         *            for tethering. Or {@link #UID_ALL} if this {@link NetworkStats} is only
+         *            counting iface stats.
+         * @param set usage state of this {@link Entry}. Should be one of the following
+         *            values: {@link #SET_DEFAULT}, {@link #SET_FOREGROUND}.
+         * @param tag tag of this {@link Entry}.
+         * @param metered metered state of this {@link Entry}. Should be one of the following
+         *                values: {link #METERED_YES}, {link #METERED_NO}.
+         * @param roaming roaming state of this {@link Entry}. Should be one of the following
+         *                values: {link #ROAMING_YES}, {link #ROAMING_NO}.
+         * @param defaultNetwork default network status of this {@link Entry}. Should be one
+         *                       of the following values: {link #DEFAULT_NETWORK_YES},
+         *                       {link #DEFAULT_NETWORK_NO}.
+         * @param rxBytes Number of bytes received for this {@link Entry}. Statistics should
+         *                represent the contents of IP packets, including IP headers.
+         * @param rxPackets Number of packets received for this {@link Entry}. Statistics should
+         *                  represent the contents of IP packets, including IP headers.
+         * @param txBytes Number of bytes transmitted for this {@link Entry}. Statistics should
+         *                represent the contents of IP packets, including IP headers.
+         * @param txPackets Number of bytes transmitted for this {@link Entry}. Statistics should
+         *                  represent the contents of IP packets, including IP headers.
+         * @param operations count of network operations performed for this {@link Entry}. This can
+         *                   be used to derive bytes-per-operation.
+         */
         public Entry(@Nullable String iface, int uid, @State int set, int tag,
                 @Meteredness int metered, @Roaming int roaming, @DefaultNetwork int defaultNetwork,
                 long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {