Android Open Source - android-movies-demo Resource Utils

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Back to project page android-movies-demo.

License

The source code is released under:

MIT License

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Java Source Code

package com.idunnolol.moviesdemo.util;
//  w ww .  j  a  v  a  2s.c  o  m
import android.util.Log;

import java.lang.reflect.Field;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Utilities relating to resources (anything under /res/ or deals
 * with the Resources class).
 */
public class ResourceUtils {

  /** Cache of resources ids, for speed */
  private static Map<Class<?>, Map<String, Integer>> mIdentifierCache = new ConcurrentHashMap<Class<?>, Map<String, Integer>>();

  /**
   * Retrieves a resource id dynamically, via reflection.  It's much faster
   * than Resources.getIdentifier(), however it only allows you to get
   * identifiers from your own package. 
   * 
   * Note that this method is still slower than retrieving resources
   * directly (e.g., R.drawable.MyResource) - it should only be used
   * when dynamically retrieving ids.
   * 
   * @param type the type of resource (e.g. R.drawable.class, R.layout.class, etc.)
   * @param name the name of the resource
   * @return the resource id, or -1 if not found
   */
  public static int getIdentifier(Class<?> type, String name) {
    // See if the cache already contains this identifier
    Map<String, Integer> typeCache;
    if (!mIdentifierCache.containsKey(type)) {
      typeCache = new ConcurrentHashMap<String, Integer>();
      mIdentifierCache.put(type, typeCache);
    }
    else {
      typeCache = mIdentifierCache.get(type);
    }

    if (typeCache.containsKey(name)) {
      return typeCache.get(name);
    }

    // Retrieve the identifier
    try {
      Field field = type.getField(name);
      int resId = field.getInt(null);

      if (resId != -1) {
        typeCache.put(name, resId);
      }

      return resId;
    }
    catch (Exception e) {
      Log.e("MovieDemo", "Failed to retrieve identifier: type=" + type + " name=" + name, e);
      return -1;
    }
  }
}

Java Source Code List