Android Open Source - OverlayView Overlay Inflator

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License

The source code is released under:

Apache License

Java Source Code

package com.mhz.overlayview;
/*from w  w  w.j  a va 2  s  .c  o  m*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.Xml;

public class OverlayInflator {

  private static final String TAG = "OverlayInflator";
  private static final Object XML_OVERLAY = "overlay";
  private static final Object OVERLAY_GROUP = "group";
  private static final Object OVERLAY_ITEM = "item";
  private Context context;

  public OverlayInflator(Context context) {
    this.context = context;
  }

  public List<OverlayState> inflate(int res) {
    try {
      XmlPullParser parser = context.getResources().getXml(res);
      AttributeSet attrs = Xml.asAttributeSet(parser);
      return parseXml(parser, attrs);
    } catch (XmlPullParserException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }

  private List<OverlayState> parseXml(XmlPullParser parser, AttributeSet attrs) throws XmlPullParserException, IOException {
    int eventType = parser.getEventType();
    String tagName;
    boolean lookingForEndOfUnknownTag = false;
    String unknownTagName = null;
    
    List<OverlayState> overlayStates = new ArrayList<OverlayState>();
    
    // This loop will skip to the menu start tag
    do {
      if (eventType == XmlPullParser.START_TAG) {
        tagName = parser.getName();
        if (tagName.equals(XML_OVERLAY)) {
          // Go to next tag
          eventType = parser.next();
          break;
        }

        throw new RuntimeException("Expecting menu, got " + tagName);
      }
      eventType = parser.next();
    } while (eventType != XmlPullParser.END_DOCUMENT);
    
    OverlayState overlayState = new OverlayState();
    
    boolean reachedEndOfMenu = false;
        while (!reachedEndOfMenu) {
            switch (eventType) {
                case XmlPullParser.START_TAG:
                    if (lookingForEndOfUnknownTag) {
                        break;
                    }
                    
                    tagName = parser.getName();

                    if (tagName.equals(OVERLAY_GROUP)) {
                      TypedArray a = context.obtainStyledAttributes(attrs,
                        R.styleable.OverlayItem);
                      overlayState.readGroup(a);
                    } else if (tagName.equals(OVERLAY_ITEM)) {
                      TypedArray a = context.obtainStyledAttributes(attrs,
                        R.styleable.OverlayItem);
                      int titl = a.getInt(R.styleable.OverlayItem_overlay_id, -1);
                      overlayState.readItem(a);
                    } else {
                        lookingForEndOfUnknownTag = true;
                        unknownTagName = tagName;
                    }
                    break;
                    
                case XmlPullParser.END_TAG:
                    tagName = parser.getName();
                    if (lookingForEndOfUnknownTag && tagName.equals(unknownTagName)) {
                        lookingForEndOfUnknownTag = false;
                        unknownTagName = null;
                    } else if (tagName.equals(OVERLAY_GROUP)) {
                      overlayState.resetGroup();
                    } else if (tagName.equals(OVERLAY_ITEM)) {
                      //TODO this might have sub items - deal with it
                      overlayStates.add(overlayState.addItem());
                        // Add the item if it hasn't been added (if the item was
                        // a submenu, it would have been added already)
//                        if (!menuState.hasAddedItem()) {
//                            if (menuState.itemActionProvider != null &&
//                                    menuState.itemActionProvider.hasSubMenu()) {
//                                menuState.addSubMenuItem();
//                            } else {
//                                menuState.addItem();
//                            }
//                        }
                    } else if (tagName.equals(XML_OVERLAY)) {
                        reachedEndOfMenu = true;
                    }
                    break;
                    
                case XmlPullParser.END_DOCUMENT:
                    throw new RuntimeException("Unexpected end of document");
            }
            eventType = parser.next();
        }
        
        
        return overlayStates;
  }

}

Java Source Code List

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