UnifiedPreferenceHelper.java 文件源码

/**
 * Called when the activity needs its list of headers built. By implementing
 * this and adding at least one item to the list, you will cause the
 * activity to run in its modern fragment mode. Note that this function may
 * not always be called; for example, if the activity has been asked to
 * display a particular fragment without the header list, there is no need
 * to build the headers.
 * 
 * <p>
 * Typical implementations will use {@link #loadHeadersFromResource} to fill
 * in the list from a resource. For convenience this is done if a header
 * resource has been set with {@link #setHeaderRes(int)}.
 * 
 * @param target The list in which to place the headers.
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
    // Do not build headers unless in single pane mode.
    if (!isSinglePane() && mHeaderRes > 0) {
        loadHeadersFromResource(mHeaderRes, target);
    }
}