Plexamp Lite 1.14: Android 4.1 build with ExoPlayer, lyrics, home-screen widget

- One build per Android level, as in Tenda: build/PlexampLite.apk (Android 2.2+, versionCode 1508) and
  build/PlexampLite-api16.apk (Android 4.1+, 1516), from shared src/ plus platform/api8 or platform/api16.
- Android 4.1 build: ExoPlayer 2.18.7 behind a small Engine interface (gapless hand-over to read-ahead and
  downloaded files, a longer buffer, MediaPlayer fallback for tracks it can't decode), a notification and
  lock screen with art and buttons, a resizable widget, Holo, a menu button without a Menu key, metered networks.
  R8 shrinks ExoPlayer and Guava (tools/fetch_exoplayer.sh, tools/r8-rules.pro).
- Both builds: lyrics in Now Playing as in the Mac app (timed lyrics follow and seek), a home-screen widget,
  media play/pause keys, the moon icon drawn without clipPath.
- PlexampLite-noreport on the SD card stops play reports, for tests against a real server.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

platform/api8/com/minamp/Platform.java

@@ -0,0 +1,66 @@
+package com.minamp;
+
+import android.app.Notification;
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+import com.minamp.plex.Item;
+
+/**
+ * What differs between Plexamp Lite's builds, for Android 2.2 and later (the Galaxy Mini). platform/api16 has the
+ * same methods for Android 4.1 and later; the rest of the app is shared and calls these. Keep the two in step.
+ */
+final class Platform {
+    private Platform() {}
+
+    /** The Android level this build is for: its minSdkVersion. */
+    static final int API = 8;
+
+    /** Size the current track's art is loaded at for the notification, lock screen and widget, in pixels. */
+    static final int ART_PX = 96;
+
+    /** At start-up, before anything else. */
+    static void init(App app) {}
+
+    /** The player for a track. {@code fallback}: the track failed to decode in the usual one. */
+    static Engine newEngine(Context c, boolean fallback) {
+        return new MediaPlayerEngine(c);
+    }
+
+    /** On a network that may cost by the megabyte (the "away" quality applies): here, anything but Wi-Fi. */
+    static boolean metered(Context c) {
+        try {
+            ConnectivityManager cm = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE);
+            NetworkInfo ni = cm.getActiveNetworkInfo();
+            return ni != null && ni.getType() != ConnectivityManager.TYPE_WIFI;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    /** The phone has no Menu key, so screens need a ⋮ button for the options menu. Android 2.x phones all have one. */
+    static boolean needsMenuButton(Context c) {
+        return false;
+    }
+
+    /** The playback notification. Android 2.x: title and artist; its notifications can't have buttons. */
+    @SuppressWarnings("deprecation")
+    static Notification playerNotification(Context c, Item it, Bitmap art, int state) {
+        Notification n = new Notification(R.drawable.ic_stat, null, 0);
+        n.flags |= Notification.FLAG_ONGOING_EVENT | Notification.FLAG_NO_CLEAR;
+        String line = (state == PlayerService.PAUSED ? c.getString(R.string.paused_dot) : "") + it.artist;
+        n.setLatestEventInfo(c, it.title, line, PlayerViews.open(c));
+        return n;
+    }
+
+    /** The lock screen's player (null item or IDLE: take it away). Android 2.x has none. */
+    static void lockScreen(Context c, Item it, Bitmap art, int state) {}
+
+    /** The widget's layout for its current size. Android 2.x widgets have one size. */
+    static int widgetLayout(AppWidgetManager m, int id) {
+        return R.layout.widget_player;
+    }
+}