podlite/platform/api16/com/miniabs/Platform.java

package com.miniabs;

import android.app.Notification;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.AudioManager;
import android.media.MediaMetadataRetriever;
import android.media.RemoteControlClient;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.StrictMode;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.RemoteViews;

/**
 * What differs between Podlite's builds, for Android 4.1 and later (Xperia J, Galaxy S II...): ExoPlayer (speed,
 * skipping silences), a notification with the cover and buttons, lock-screen controls, metered networks, and the
 * ⋮ button on phones without a Menu key. platform/api8 has the same methods for Android 2.2; keep the two in step.
 */
final class Platform {
    private Platform() {}

    static final int API = 16;

    static final boolean SPEED = true;

    static final int COVER_PX = 320;   // the lock screen shows it large

    private static boolean initDone;

    static void init(Context c) {
        if (initDone) return;
        initDone = true;
        // Shared code sometimes closes a connection on the main thread (always brief). Android 2.x allows that;
        // Android 3+ kills apps that target it. Allow it here too.
        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder(StrictMode.getThreadPolicy()).permitNetwork().build());
    }

    static Engine newEngine(Context c, boolean fallback) {
        return fallback ? new MediaPlayerEngine(c) : new ExoEngine(c);
    }

    /** Android 4.1 knows which networks cost: mobile data, and a Wi-Fi that is a phone's hotspot. */
    static boolean unmetered(Context c) {
        try {
            ConnectivityManager cm = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo ni = cm == null ? null : cm.getActiveNetworkInfo();
            return ni != null && ni.isConnected() && !cm.isActiveNetworkMetered();
        } catch (Exception e) {
            return false;
        }
    }

    static boolean needsMenuButton(Context c) {
        return !ViewConfiguration.get(c).hasPermanentMenuKey();
    }

    /** Cover, title and show with −15 ⏯ +30 and ✕ (pulled down, a larger one). Swiping it away while paused stops. */
    static Notification playerNotification(Context c, Episode ep, String what, Bitmap cover, int state, boolean ongoing) {
        Notification n = new Notification.Builder(c)
                .setSmallIcon(R.drawable.ic_stat)
                .setContent(views(c, R.layout.notif_player, ep, what, cover, state))
                .setContentIntent(openPlayer(c))
                .setDeleteIntent(service(c, PlayerService.A_STOP, 14))
                .setOngoing(ongoing)
                .setWhen(0)
                .setPriority(state == PlayerService.PLAYING ? Notification.PRIORITY_HIGH : Notification.PRIORITY_DEFAULT)
                .build();
        n.bigContentView = views(c, R.layout.notif_player_big, ep, what, cover, state);
        return n;
    }

    private static Bitmap small, smallOf;

    private static RemoteViews views(Context c, int layout, Episode ep, String what, Bitmap cover, int state) {
        RemoteViews v = new RemoteViews(c.getPackageName(), layout);
        v.setTextViewText(R.id.n_title, ep.title);
        v.setTextViewText(R.id.n_sub, Util.join(what, ep.show));
        if (cover != null) {
            // the size the notification shows it at: a full-size bitmap would be copied to the status bar each time
            if (cover != smallOf) {
                int px = (int) (112 * c.getResources().getDisplayMetrics().density);
                smallOf = cover;
                small = cover.getWidth() <= px ? cover : Bitmap.createScaledBitmap(cover, px, px * cover.getHeight() / cover.getWidth(), true);
            }
            v.setImageViewBitmap(R.id.n_cover, small);
        }
        Prefs p = Prefs.get(c);
        v.setTextViewText(R.id.n_back, "−" + p.skipBack());
        v.setTextViewText(R.id.n_fwd, "+" + p.skipFwd());
        boolean playing = state == PlayerService.PLAYING || state == PlayerService.LOADING;
        v.setImageViewResource(R.id.n_play, playing ? R.drawable.ic_pause_small : R.drawable.ic_play_small);
        v.setOnClickPendingIntent(R.id.n_back, service(c, PlayerService.A_BACK, 11));
        v.setOnClickPendingIntent(R.id.n_play, service(c, PlayerService.A_TOGGLE, 12));
        v.setOnClickPendingIntent(R.id.n_fwd, service(c, PlayerService.A_FWD, 13));
        v.setOnClickPendingIntent(R.id.n_close, service(c, PlayerService.A_STOP, 14));
        v.setOnClickPendingIntent(R.id.n_cover, openPlayer(c));
        v.setOnClickPendingIntent(R.id.n_text, openPlayer(c));
        v.setViewVisibility(R.id.n_close, View.VISIBLE);
        return v;
    }

    static PendingIntent openPlayer(Context c) {
        Intent i = new Intent(c, PlayerActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        return PendingIntent.getActivity(c, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    private static PendingIntent service(Context c, String action, int request) {
        return PendingIntent.getService(c, request, new Intent(c, PlayerService.class).setAction(action), 0);
    }

    private static RemoteControlClient remote;
    private static String remoteFor;
    private static Bitmap remoteCover;

    /** The lock screen's player: cover, title, show and buttons (⏮ ⏭ skip back and forward: media keys). */
    static void lockScreen(Context c, Episode ep, Bitmap cover, int state) {
        AudioManager am = (AudioManager) c.getSystemService(Context.AUDIO_SERVICE);
        if (ep == null || state == PlayerService.IDLE) {
            if (remote != null) {
                remote.setPlaybackState(RemoteControlClient.PLAYSTATE_STOPPED);
                am.unregisterRemoteControlClient(remote);
                remote = null;
                remoteFor = null;
                remoteCover = null;
            }
            return;
        }
        if (remote == null) {
            ComponentName buttons = new ComponentName(c, MediaButtonReceiver.class);
            am.registerMediaButtonEventReceiver(buttons);
            Intent i = new Intent(Intent.ACTION_MEDIA_BUTTON).setComponent(buttons);
            remote = new RemoteControlClient(PendingIntent.getBroadcast(c.getApplicationContext(), 0, i, 0));
            remote.setTransportControlFlags(RemoteControlClient.FLAG_KEY_MEDIA_PLAY | RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
                    | RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE | RemoteControlClient.FLAG_KEY_MEDIA_NEXT
                    | RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS);
            am.registerRemoteControlClient(remote);
        }
        remote.setPlaybackState(state == PlayerService.PLAYING ? RemoteControlClient.PLAYSTATE_PLAYING
                : state == PlayerService.LOADING ? RemoteControlClient.PLAYSTATE_BUFFERING
                : state == PlayerService.ERROR ? RemoteControlClient.PLAYSTATE_ERROR : RemoteControlClient.PLAYSTATE_PAUSED);
        if (ep.id.equals(remoteFor) && cover == remoteCover) return;
        remoteFor = ep.id;
        remoteCover = cover;
        RemoteControlClient.MetadataEditor ed = remote.editMetadata(true);
        ed.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, ep.title);
        ed.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, ep.show);
        ed.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, (long) (ep.duration * 1000));
        // a copy: Android recycles the artwork it's given when the next one comes, and this one is in the cover cache
        if (cover != null) ed.putBitmap(RemoteControlClient.MetadataEditor.BITMAP_KEY_ARTWORK, cover.copy(Bitmap.Config.ARGB_8888, false));
        ed.apply();
    }
}