externalize notification helper for icon

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/NotificationUtils.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui.util;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+
+public class NotificationUtils {
+
+    // from de.azapps.mirakel.helper.Helpers from https://github.com/MirakelX/mirakel-android
+    public static Bitmap getBitmap(int resId, Context context) {
+        int mLargeIconWidth = (int) context.getResources().getDimension(
+                android.R.dimen.notification_large_icon_width);
+        int mLargeIconHeight = (int) context.getResources().getDimension(
+                android.R.dimen.notification_large_icon_height);
+        Drawable d;
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            // noinspection deprecation (can't help it at this api level)
+            d = context.getResources().getDrawable(resId);
+        } else {
+            d = context.getDrawable(resId);
+        }
+        if (d == null) {
+            return null;
+        }
+        Bitmap b = Bitmap.createBitmap(mLargeIconWidth, mLargeIconHeight, Bitmap.Config.ARGB_8888);
+        Canvas c = new Canvas(b);
+        d.setBounds(0, 0, mLargeIconWidth, mLargeIconHeight);
+        d.draw(c);
+        return b;
+    }
+}