add Android stuff

Author: tlancina

plugin.xml

@@ -16,6 +16,19 @@
     	<clobbers target="window.Keyboard" />
     </js-module>
 
+    <!-- android -->
+    <platform name="android">
+
+    <config-file target="config.xml" parent="/*">
+      <feature name="Keyboard">
+        <param name="android-package" value="com.ionic.keyboard.IonicKeyboard" />
+        <param name="onload" value="true" />
+      </feature>
+    </config-file>
+
+    <source-file src="src/android/IonicKeyboard.java" target-dir="src/com/ionic/keyboard" />
+  </platform>
+
     <!-- ios -->
     <platform name="ios">
         <config-file target="config.xml" parent="/*">

src/android/IonicKeyboard.java

@@ -0,0 +1,48 @@
+package com.ionic.keyboard; 
+
+import org.apache.cordova.CordovaInterface;
+import org.apache.cordova.CordovaPlugin;
+import org.apache.cordova.CordovaWebView;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.graphics.Rect;
+import android.util.DisplayMetrics;
+import android.view.View;
+import android.view.ViewTreeObserver.OnGlobalLayoutListener;
+
+public class IonicKeyboard extends CordovaPlugin{
+
+	public void initialize(CordovaInterface cordova, CordovaWebView webView) {
+        super.initialize(cordova, webView);
+        
+        //calculate density-independent pixels (dp)
+        //http://developer.android.com/guide/practices/screens_support.html
+        DisplayMetrics dm = new DisplayMetrics();
+        cordova.getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
+        final int density = (int)(dm.density);
+        
+        final CordovaWebView appView = webView;
+        
+        final View rootView = cordova.getActivity().getWindow().getDecorView().findViewById(android.R.id.content).getRootView();
+        OnGlobalLayoutListener list = new OnGlobalLayoutListener() {
+        	int previousHeightDiff = 0;
+            @Override
+            public void onGlobalLayout() {
+            	Rect r = new Rect();
+                //r will be populated with the coordinates of your view that area still visible.
+                rootView.getWindowVisibleDisplayFrame(r);
+
+                int heightDiff = rootView.getRootView().getHeight() - (r.bottom - r.top);
+                if (heightDiff > 200 && heightDiff != previousHeightDiff) { // if more than 100 pixels, its probably a keyboard...
+                	 int keyboardHeight = (int)(heightDiff / density);
+                     appView.sendJavascript("cordova.fireWindowEvent('showkeyboard', { 'keyboardHeight':" + Integer.toString(keyboardHeight)+"});");
+                }
+                previousHeightDiff = heightDiff;
+             }
+        }; 
+        
+        rootView.getViewTreeObserver().addOnGlobalLayoutListener(list);
+    }
+
+}