SnackbarManagerImpl

Snackbarmanager

import android.app.Activity;
import android.os.Handler;
import android.os.Message;

import com.nispok.snackbar.Snackbar;

import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;

import ru.noties.debug.Debug;

/**
 * Created by Dimitry Ivanov (noties.app@gmail.com) on 26/11/14.
 */
public class SnackbarManager {

    private static volatile SnackbarManager sInstance = null;

    public static SnackbarManager getInstance() {
        SnackbarManager localInstance = sInstance;
        if (localInstance == null) {
            synchronized (SnackbarManager.class) {
                localInstance = sInstance;
                if (localInstance == null) {
                    localInstance = sInstance = new SnackbarManager();
                }
            }
        }
        return localInstance;
    }

    private final Map<String, WeakReference<Snackbar>> mSnacks;
    private final Handler mHandler;

    private SnackbarManager() {
        mSnacks = new HashMap<>();
        mHandler = new SnackHandler();
    }

    public void show(Activity activity, Snackbar snackbar, String tag) {

        if (tag != null) {

            final WeakReference<Snackbar> reference = mSnacks.get(tag);
            final Snackbar currentSnack = reference == null ? null : reference.get();

            // if we are still holding a snack instance - then dismiss it
            if (currentSnack != null) {
                currentSnack.dismiss();
                mSnacks.remove(tag);

                mHandler.removeMessages(SnackHandler.END, tag);
            }

            mSnacks.put(tag, new WeakReference<>(snackbar));

            final long duration = snackbar.getDuration();
            final Message message = mHandler.obtainMessage(SnackHandler.END, tag);
            mHandler.sendMessageDelayed(message, duration);
        }

        snackbar.show(activity);
    }

    private class SnackHandler extends Handler {

        static final int END = 1;

        @Override
        public void handleMessage(Message msg) {

            final String tag = (String) msg.obj;
            final boolean result = mSnacks.remove(tag) != null;

            Debug.i("tag: %s, result: %s", msg.obj, result);
        }
    }

}