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// getViewById("tvTest");
public View getViewById(String id) {
    // Retrieve the resource id
    String packageName = getBaseContext().getPackageName();
    Resources resources = getBaseContext().getResources();
    int viewId = resources.getIdentifier(id, "id", packageName);
    if (viewId == 0) { return null; }
    // Return the string value based on the res id
    return findViewById(viewId);
}

public String getStringValue(String key) {
    // Retrieve the resource id
    String packageName = getBaseContext().getPackageName();
    Resources resources = getBaseContext().getResources();
    int stringId = resources.getIdentifier(key, "string", packageName);
    if (stringId == 0) { return null; }
    // Return the string value based on the res id
    return resources.getString(stringId);
}