Add dip2pixel and update image grid test.

Author: androidquery

demo/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="com.androidquery"
-      android:versionCode="52"
-      android:versionName="0.29.52">
+      android:versionCode="53"
+      android:versionName="0.29.53">
 
 
 	<uses-permission android:name="android.permission.INTERNET" /> 

demo/src/com/androidquery/test/image/ImageGridFragment.java

@@ -112,7 +112,7 @@ public View getView(int position, View convertView, ViewGroup parent) {
 
 				}else{
 
-					aq.id(R.id.tb).image(tbUrl, true, true, 200, 0, null, 0, 0);
+					aq.id(R.id.tb).image(tbUrl, true, true, 200, R.drawable.image_missing, null, 0, 0);
 				}
 
 				return convertView;

src/com/androidquery/util/AQUtility.java

@@ -38,10 +38,12 @@
 import android.app.Application;
 import android.content.Context;
 import android.content.SharedPreferences.Editor;
+import android.content.res.Resources;
 import android.os.AsyncTask;
 import android.os.Environment;
 import android.os.Handler;
 import android.os.Looper;
+import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.View;
@@ -676,6 +678,14 @@ public static int dip2pixel(Context context, float n){
 		return value;
 	}
 
+	public static float pixel2dip(Context context, float n){
+	    Resources resources = context.getResources();
+	    DisplayMetrics metrics = resources.getDisplayMetrics();
+	    float dp = n / (metrics.densityDpi / 160f);
+	    return dp;
+
+	}
+	
 	private static Context context;
 	public static void setContext(Application app){
 		context = app.getApplicationContext();