adds real window height constant

Example/index.android.js

@@ -4,22 +4,26 @@
 const React = require('react-native');
 const {
   AppRegistry,
-  StyleSheet,
+  Dimensions,
   Text,
-  View,
+  View
 } = React;
 
 const ExtraDimensions = require('react-native-extra-dimensions-android');
 
+const window = Dimensions.get('window');
+
 const Example = React.createClass({
-  render: function() {
+  render() {
     return (
-      <View style={{ flex: 1, flexDirection: 'column' }}>
-        <View style={{ backgroundColor: 'blue', justifyContent: 'center', alignItems: 'center', height: ExtraDimensions.get('STATUS_BAR_HEIGHT') }}>
+      <View style={{ flex: 1 }}>
+        <View style={{ backgroundColor: 'red', justifyContent: 'center', alignItems: 'center', height: ExtraDimensions.get('STATUS_BAR_HEIGHT')}}>
           <Text style={{ color: 'white' }}>STATUS_BAR_HEIGHT ({ExtraDimensions.get('STATUS_BAR_HEIGHT')})</Text>
         </View>
-        <View style={{ flex: 1 }}/>
-        <View style={{ backgroundColor: 'green', justifyContent: 'center', alignItems: 'center', height: ExtraDimensions.get('SOFT_MENU_BAR_HEIGHT') }}>
+        <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
+          <Text>REAL_WINDOW_HEIGHT ({ExtraDimensions.get('REAL_WINDOW_HEIGHT')})</Text>
+        </View>
+        <View style={{ backgroundColor: 'blue', justifyContent: 'center', alignItems: 'center', height: ExtraDimensions.get('SOFT_MENU_BAR_HEIGHT')}}>
           <Text style={{ color: 'white' }}>SOFT_MENU_BAR_HEIGHT ({ExtraDimensions.get('SOFT_MENU_BAR_HEIGHT')})</Text>
         </View>
       </View>

android/src/main/java/ca/jaysoo/extradimensions/ExtraDimensionsModule.java

@@ -32,6 +32,7 @@ public class ExtraDimensionsModule extends ReactContextBaseJavaModule {
 
         constants.put("STATUS_BAR_HEIGHT", getStatusBarHeight());
         constants.put("SOFT_MENU_BAR_HEIGHT", getSoftMenuBarHeight());
+        constants.put("REAL_WINDOW_HEIGHT", getRealHeight());
 
         return constants;
     }
@@ -54,10 +55,14 @@ public class ExtraDimensionsModule extends ReactContextBaseJavaModule {
         mCurrentActivity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
         int usableHeight = metrics.heightPixels;
 
-        mCurrentActivity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
-        int realHeight = metrics.heightPixels;
+        return Math.max(0, getRealHeight() - usableHeight / metrics.density);
+    }
 
-        return Math.max(0, realHeight - usableHeight) / metrics.density;
+    private float getRealHeight() {
+        Context ctx = getReactApplicationContext();
+        DisplayMetrics metrics = ctx.getResources().getDisplayMetrics();
+        mCurrentActivity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
+        return metrics.heightPixels / metrics.density;
     }
 }