/* * Copyright 2017 Google Inc. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.ar.core.examples.java.common.helpers; import android.app.Activity; import android.support.design.widget.BaseTransientBottomBar; import android.support.design.widget.Snackbar; import android.view.View; import android.widget.TextView; /** * Helper to manage the sample snackbar. Hides the Android boilerplate code, and exposes simpler * methods. */ public final class SnackbarHelper { private static final int BACKGROUND_COLOR = 0xbf323232; private Snackbar messageSnackbar; private enum DismissBehavior { HIDE, SHOW, FINISH }; private int maxLines = 2; public boolean isShowing() { return messageSnackbar != null; } /** Shows a snackbar with a given message. */ public void showMessage(Activity activity, String message) { show(activity, message, DismissBehavior.HIDE); } /** Shows a snackbar with a given message, and a dismiss button. */ public void showMessageWithDismiss(Activity activity, String message) { show(activity, message, DismissBehavior.SHOW); } /** * Shows a snackbar with a given error message. When dismissed, will finish the activity. Useful * for notifying errors, where no further interaction with the activity is possible. */ public void showError(Activity activity, String errorMessage) { show(activity, errorMessage, DismissBehavior.FINISH); } /** * Hides the currently showing snackbar, if there is one. Safe to call from any thread. Safe to * call even if snackbar is not shown. */ public void hide(Activity activity) { activity.runOnUiThread( new Runnable() { @Override public void run() { if (messageSnackbar != null) { messageSnackbar.dismiss(); } messageSnackbar = null; } }); } public void setMaxLines(int lines) { maxLines = lines; } private void show( final Activity activity, final String message, final DismissBehavior dismissBehavior) { activity.runOnUiThread( new Runnable() { @Override public void run() { messageSnackbar = Snackbar.make( activity.findViewById(android.R.id.content), message, Snackbar.LENGTH_INDEFINITE); messageSnackbar.getView().setBackgroundColor(BACKGROUND_COLOR); if (dismissBehavior != DismissBehavior.HIDE) { messageSnackbar.setAction( "Dismiss", new View.OnClickListener() { @Override public void onClick(View v) { messageSnackbar.dismiss(); } }); if (dismissBehavior == DismissBehavior.FINISH) { messageSnackbar.addCallback( new BaseTransientBottomBar.BaseCallback<Snackbar>() { @Override public void onDismissed(Snackbar transientBottomBar, int event) { super.onDismissed(transientBottomBar, event); activity.finish(); } }); } } ((TextView) messageSnackbar .getView() .findViewById(android.support.design.R.id.snackbar_text)) .setMaxLines(maxLines); messageSnackbar.show(); } }); } }