深入解析Android App开发中Context的用法

public Resources getTopLevelResources(String resDir, int displayId, 
    Configuration overrideConfiguration, CompatibilityInfo compatInfo, IBinder token) { 
  final float scale = compatInfo.applicationScale; 
  ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfiguration, scale, 
      token); 
  Resources r; 
  synchronized (this) { 
    // Resources is app scale dependent. 
    if (false) { 
      Slog.w(TAG, "getTopLevelResources: " + resDir + " / " + scale); 
    } 
    WeakReference<Resources> wr = mActiveResources.get(key); 
    r = wr != null ? wr.get() : null; 
    //if (r != null) Slog.i(TAG, "isUpToDate " + resDir + ": " + r.getAssets().isUpToDate()); 
    if (r != null && r.getAssets().isUpToDate()) { 
      if (false) { 
        Slog.w(TAG, "Returning cached resources " + r + " " + resDir 
            + ": appScale=" + r.getCompatibilityInfo().applicationScale); 
      } 
      return r; 
    } 
  } 
 
  //if (r != null) { 
  //  Slog.w(TAG, "Throwing away out-of-date resources!!!! " 
  //      + r + " " + resDir); 
  //} 
 
  AssetManager assets = new AssetManager(); 
  if (assets.addAssetPath(resDir) == 0) { 
    return null; 
  } 
 
  //Slog.i(TAG, "Resource: key=" + key + ", display metrics=" + metrics); 
  DisplayMetrics dm = getDisplayMetricsLocked(displayId); 
  Configuration config; 
  boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY); 
  final boolean hasOverrideConfig = key.hasOverrideConfiguration(); 
  if (!isDefaultDisplay || hasOverrideConfig) { 
    config = new Configuration(getConfiguration()); 
    if (!isDefaultDisplay) { 
      applyNonDefaultDisplayMetricsToConfigurationLocked(dm, config); 
    } 
    if (hasOverrideConfig) { 
      config.updateFrom(key.mOverrideConfiguration); 
    } 
  } else { 
    config = getConfiguration(); 
  } 
  r = new Resources(assets, dm, config, compatInfo, token); 
  if (false) { 
    Slog.i(TAG, "Created app resources " + resDir + " " + r + ": " 
        + r.getConfiguration() + " appScale=" 
        + r.getCompatibilityInfo().applicationScale); 
  } 
 
  synchronized (this) { 
    WeakReference<Resources> wr = mActiveResources.get(key); 
    Resources existing = wr != null ? wr.get() : null; 
    if (existing != null && existing.getAssets().isUpToDate()) { 
      // Someone else already created the resources while we were 
      // unlocked; go ahead and use theirs. 
      r.getAssets().close(); 
      return existing; 
    } 
 
    // XXX need to remove entries when weak references go away 
    mActiveResources.put(key, new WeakReference<Resources>(r)); 
    return r; 
  } 
} 
								 
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