SkAR Java: refactored project structure

1) Changed file paths
2) Added helpers that were missing previously

Bug: skia:
Change-Id: Idb4194fcef815a23277a17670acf46255a47451d
Reviewed-on: https://skia-review.googlesource.com/143680
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/platform_tools/android/apps/skar_java/src/main/java/com/google/skar/examples/helloskar/helpers/SnackbarHelper.java b/platform_tools/android/apps/skar_java/src/main/java/com/google/skar/examples/helloskar/helpers/SnackbarHelper.java
new file mode 100644
index 0000000000..02393499e9
--- /dev/null
+++ b/platform_tools/android/apps/skar_java/src/main/java/com/google/skar/examples/helloskar/helpers/SnackbarHelper.java
@@ -0,0 +1,113 @@
+/*
+ * 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.skar.examples.helloskar.helpers;
+
+import android.app.Activity;
+import android.support.design.widget.BaseTransientBottomBar;
+import android.support.design.widget.Snackbar;
+import android.view.View;
+
+/**
+ * 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}
+
+    ;
+
+    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;
+                    }
+                });
+    }
+
+    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();
+                                            }
+                                        });
+                            }
+                        }
+                        messageSnackbar.show();
+                    }
+                });
+    }
+}