Release React Native for Android

This is an early release and there are several things that are known
not to work if you're porting your iOS app to Android.

See the Known Issues guide on the website.

We will work with the community to reach platform parity with iOS.

ReactAndroid/src/main/java/com/facebook/react/uimanager/PixelUtil.java

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.uimanager;
+
+import android.util.TypedValue;
+
+/**
+ * Android dp to pixel manipulation
+ */
+public class PixelUtil {
+
+  /**
+   * Convert from DIP to PX
+   */
+  public static float toPixelFromDIP(float value) {
+    return TypedValue.applyDimension(
+        TypedValue.COMPLEX_UNIT_DIP,
+        value,
+        DisplayMetricsHolder.getDisplayMetrics());
+  }
+
+  /**
+   * Convert from DIP to PX
+   */
+  public static float toPixelFromDIP(double value) {
+    return toPixelFromDIP((float) value);
+  }
+
+  /**
+   * Convert from SP to PX
+   */
+  public static float toPixelFromSP(float value) {
+    return TypedValue.applyDimension(
+        TypedValue.COMPLEX_UNIT_SP,
+        value,
+        DisplayMetricsHolder.getDisplayMetrics());
+  }
+
+  /**
+   * Convert from SP to PX
+   */
+  public static float toPixelFromSP(double value) {
+    return toPixelFromSP((float) value);
+  }
+
+  /**
+   * Convert from PX to DP
+   */
+  public static float toDIPFromPixel(float value) {
+    return value / DisplayMetricsHolder.getDisplayMetrics().density;
+  }
+
+}