Merge pull request #1 from Spikef/master

Add "SMART_BAR_SIZE" for MeiZu device.

README.md

@@ -5,6 +5,7 @@ This module allows you to access additional display metrics on Android devices.
 - Actual width and height of the screen (including elements such as soft menu bar)
 - Soft menu height
 - Status bar height
+- Smart bar height(MeiZu)
 
 ### Why?
 
@@ -84,3 +85,4 @@ Supported dimensions are:
 - `REAL_WINDOW_WIDTH` - Actual width of screen including system decor elements
 - `STATUS_BAR_HEIGHT` - Height of the status bar
 - `SOFT_MENU_BAR_HEIGHT` - Height of the soft menu bar (supported on most new Android devices)
+- `SMART_BAR_HEIGHT` - Height of the MeiZu's device smart bar

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

@@ -8,6 +8,8 @@ import android.content.Context;
 import android.os.Build;
 import android.util.DisplayMetrics;
 import android.view.Display;
+import android.provider.Settings;
+import android.content.res.Resources;
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
@@ -15,6 +17,8 @@ import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import java.util.HashMap;
 import java.util.Map;
 
+import java.lang.reflect.Field;
+
 public class ExtraDimensionsModule extends ReactContextBaseJavaModule {
     private Activity mCurrentActivity;
 
@@ -53,6 +57,7 @@ public class ExtraDimensionsModule extends ReactContextBaseJavaModule {
         constants.put("REAL_WINDOW_WIDTH", getRealWidth(metrics));
         constants.put("STATUS_BAR_HEIGHT", getStatusBarHeight(metrics));
         constants.put("SOFT_MENU_BAR_HEIGHT", getSoftMenuBarHeight(metrics));
+        constants.put("SMART_BAR_HEIGHT", getSmartBarHeight(metrics));
 
         return constants;
     }
@@ -84,5 +89,52 @@ public class ExtraDimensionsModule extends ReactContextBaseJavaModule {
     private float getRealWidth(DisplayMetrics metrics) {
         return metrics.widthPixels / metrics.density;
     }
+
+    // 获取魅族SmartBar高度
+    private float getSmartBarHeight(DisplayMetrics metrics) {
+        final Context context = getReactApplicationContext();
+        final boolean isMeiZu = Build.MANUFACTURER.equals("Meizu");
+ 
+        final boolean autoHideSmartBar = Settings.System.getInt(context.getContentResolver(),
+            "mz_smartbar_auto_hide", 0) == 1;
+ 
+        if (isMeiZu) {
+            if (autoHideSmartBar) {
+                return 0;
+            } else {
+                try {
+                    Class c = Class.forName("com.android.internal.R$dimen");
+                    Object obj = c.newInstance();
+                    Field field = c.getField("mz_action_button_min_height");
+                    int height = Integer.parseInt(field.get(obj).toString());
+                    return context.getResources().getDimensionPixelSize(height) / metrics.density;
+                } catch (Throwable e) { // 不自动隐藏smartbar同时又没有smartbar高度字段供访问，取系统navigationbar的高度
+                    return getNormalNavigationBarHeight(context) / metrics.density;
+                }
+            }
+        } else {
+            return 0;
+            //return getNormalNavigationBarHeight(context) / metrics.density;
+        }
+    }
+ 
+    protected static float getNormalNavigationBarHeight(final Context ctx) {
+        try {
+            final Resources res = ctx.getResources();
+            int rid = res.getIdentifier("config_showNavigationBar", "bool", "android");
+            if (rid > 0) {
+                boolean flag = res.getBoolean(rid);
+                if (flag) {
+                    int resourceId = res.getIdentifier("navigation_bar_height", "dimen", "android");
+                    if (resourceId > 0) {
+                        return res.getDimensionPixelSize(resourceId);
+                    }
+                }
+            }
+        } catch (Throwable e) {
+            return 0;
+        }
+        return 0;
+    }
 }