How To Get Resource Id Dynamically In Android

In Android, we normally use the R class in order to gain access to the drawable, layout, string (and others) variables.

I made this helper method to get a resource id dynamically. However, if you have no need for this, it is a better option to use the R class directly as the search operation is quicker compared to this.

public static int getResId(String variableName, Context context, Class<?> c) {
    try {
        Field idField = c.getDeclaredField(variableName);
        return idField.getInt(idField);
    } catch (Exception e) {
        e.printStackTrace();
        return -1;
    } 
}

Let us say, you have an XML file named help.xml in your res/layout/ folder. To use the method, do it like this.

getRestId("help", this, R.layout.class);

How To Fix ResourceDictionary Is Inside A ResourceDictionary And Does Not Have A Key

The solution is very easy actually but usually hounds new Windows Phone developers when they start with XAML. Just make sure your ResourceDictionary tag is first in your Application.Resources tag.

I encountered this problem because I declared the internationalization resource file first and then resource dictionary second (see code below).

<Application.Resources>
  <local:LocalizedStrings xmlns:local="clr-namespace:HelloWorld.Resources" x:Key="LocalizedStrings" />
  <ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
      <ResourceDictionary Source="Resources.xaml"/>
    </ResourceDictionary.MergedDictionaries>
  </ResourceDictionary>
</Application.Resources>

By transferring the ResourceDictionary tag to the top, that fixed the problem.

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