java - 如果墙纸是从另一个应用程序设置的，如何停止服务

Question

我正在使用一项服务在一段时间后更改墙纸并且它工作正常，现在的问题是“如果用户从任何其他应用程序设置墙纸但由于我的应用程序服务在后台运行而无法显示”我怎么能如果用户设置任何其他应用壁纸，请停止它。

   public class Wallpaper extends Service { 
    SharedPreferences customSharedPreference;
    int img[] = { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d,
            R.drawable.e, R.drawable.f, R.drawable.g, R.drawable.h,
            R.drawable.i, R.drawable.j, R.drawable.k, R.drawable.l,
            R.drawable.m, R.drawable.n, R.drawable.o };
    WallpaperManager wpm;

    int delay = 0;
    Timer timer;
    int index = -1;
    int int_delay = 500;

    public Wallpaper() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {

        delay = 10;
        customSharedPreference = getSharedPreferences(
                "com.janbark.live.wall.paper", Context.MODE_PRIVATE);
        int_delay = Integer.parseInt(customSharedPreference.getString(
                "userChoice", "500").toString());
        timer = new Timer();
    }

    @Override
    public void onStart(Intent intent, int startId) {

        timer.scheduleAtFixedRate(new TimerTask() {

            public void run() {
                index++;
                if (int_delay != Integer.parseInt(customSharedPreference
                        .getString("userChoice", "500").toString())) {
                    timer.cancel();
                }
                Log.d("TAGDELAY", "" + int_delay);
                wpm = WallpaperManager.getInstance(getApplicationContext());

                if (index <= 14) {
                    if(!customSharedPreference.getBoolean("Live", true)){
                        timer.cancel();
                        stopService(new Intent(Wallpaper.this,Wallpaper.class));
                    }
                    try {
                        wpm.setResource(img[index]);

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    if (index == 14)
                        index = -1;
                }

            }

        }, delay, int_delay);

    }

    @Override
    public void onDestroy() {

    }
}

Answer 1

如果您设置的壁纸是动态壁纸，并且看起来是这种情况，请使用:

boolean wallpaperWasSetByAnotherApp() {
     WallpaperManager wp_mngr = (WallpaperManager) getSystemService(WALLPAPER_SERVICE);
     WallpaperInfo info = wp_mngr.getWallpaperInfo();
     if (info == null) {
         // wallpaper is a static image
         return true; 
     } else {
         // wallpaper is live, check implementing service
         return !info.getComponent().equals(new ComponentName(this, getClass()));
     }
}