Load resource (layout) from another apk dynamically


Ask by : Siddharth Naik March 18, 2016 08:22

I managed to pull the layouts, and i add it to my viewflipper, however, there it is loaded as blank.

The code is,

Resources packageResources;
Context packageContext;
try
{   
    packageResources = pm.getResourcesForApplication(packageName);
    packageContext = this.createPackageContext(packageName,     Context.CONTEXT_INCLUDE_CODE + Context.CONTEXT_IGNORE_SECURITY);                
 }
 catch(NameNotFoundException excep)
 {
     // the package does not exist. move on to see if another exists.
 }

 Class layoutClass;
 try
 {
       // using reflection to get the layout class inside the R class of the package
       layoutClass = packageContext.getClassLoader().loadClass(packageName + ".R$layout");
 }
 catch (ClassNotFoundException excep1)
 {
     // Less chances that class won't be there.
 }

 for( Field layoutID : layoutClass.getFields() )
 {
    try
    {
        int id = layoutID.getInt(layoutClass);
        XmlResourceParser xmlResourceLayout = packageResources.getLayout(id);

        View v = new View(this, Xml.asAttributeSet(xmlResourceLayout));

        this.viewFlipper.addView(v);                 
    }
    catch (Exception excep)
   {
    continue;
   }
}

I get no errors, and i debugged and checked. The layout IDs are correct. However, in my viewFlipper its just blank. No warnings or errors i can find.

View original question

Answer by : Siddharth NaikNovember 04, 2012 17:56

Finally got it.... Its actually simple !!!!

Here is what i did...

  1. In the target apk, there is only resources and layouts with no application or activity code. I created a class,

    public final class ViewExtractor
    {
        private static final int NUMBER_OF_LAYOUTS = 5;
    
        public static View[] getAllViews(Context context)
        {
            View[] result = new View[ViewExtractor.NUMBER_OF_LAYOUTS];
    
            result[0] = View.inflate(context, R.layout.layout_0, null);
            result[1] = View.inflate(context, R.layout.layout_1, null);
            result[2] = View.inflate(context, R.layout.layout_2, null);
            result[3] = View.inflate(context, R.layout.layout_3, null);
            result[4] = View.inflate(context, R.layout.layout_4, null);
    
            return result;
        }
     }
    

Then in my current application, I modified my earlier code. The modification takes place once package has been verified to exist.

        // If the package exists then get the resources within it.
        // Use the method in the class to get the views.
        Class<?> viewExtractor;
        try
        {
            viewExtractor = packageContext.getClassLoader().loadClass(packageName + ".ViewExtractor");
        }
        catch (ClassNotFoundException excep)
        {
            continue;
        }

        View[] resultViews;
        try
        {
            Method m = viewExtractor.getDeclaredMethod("getAllViews", Context.class);

            resultViews= (View[])m.invoke(null, new Object[]{packageContext});

            for( View v : resultViews)
            {
                this.viewFlipper.addView(v);
            }
        }
        catch (Exception excep)
        {
            excep.printStackTrace();
        }   
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