content: package allen.town.focus.twitter.views.widgets;
  
  /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  
  import android.R;
  import android.app.ActionBar;
  import android.app.Activity;
  import android.content.res.TypedArray;
  import android.graphics.drawable.Drawable;
  import android.util.Log;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.ImageView;
  
  import java.lang.reflect.Method;
  
  /**
   * This class encapsulates some awful hacks.
   * <p/>
   * Before JB-MR2 (API 18) it was not possible to change the home-as-up indicator glyph
   * in an action bar without some really gross hacks. Since the MR2 SDK is not published as of
   * this writing, the new API is accessed via reflection here if available.
   */
  class ActionBarDrawerToggleHoneycomb {
      private static final String TAG = "ActionBarDrawerToggleHoneycomb";
  
      private static final int[] THEME_ATTRS = new int[]{
              R.attr.homeAsUpIndicator
      };
  
      public static Object setActionBarUpIndicator(Object info, Activity activity,
                                                   Drawable drawable, int contentDescRes) {
          if (info == null) {
              info = new SetIndicatorInfo(activity);
          }
          final SetIndicatorInfo sii = (SetIndicatorInfo) info;
          if (sii.setHomeAsUpIndicator != null) {
              try {
                  final ActionBar actionBar = activity.getActionBar();
                  sii.setHomeAsUpIndicator.invoke(actionBar, drawable);
                  sii.setHomeActionContentDescription.invoke(actionBar, contentDescRes);
              } catch (Exception e) {
                  Log.w(TAG, "Couldn't set home-as-up indicator via JB-MR2 API", e);
              }
          } else if (sii.upIndicatorView != null) {
              sii.upIndicatorView.setImageDrawable(drawable);
          } else {
              Log.w(TAG, "Couldn't set home-as-up indicator");
          }
          return info;
      }
  
      public static Object setActionBarDescription(Object info, Activity activity,
                                                   int contentDescRes) {
          if (info == null) {
              info = new SetIndicatorInfo(activity);
          }
          final SetIndicatorInfo sii = (SetIndicatorInfo) info;
          if (sii.setHomeAsUpIndicator != null) {
              try {
                  final ActionBar actionBar = activity.getActionBar();
                  sii.setHomeActionContentDescription.invoke(actionBar, contentDescRes);
              } catch (Exception e) {
                  Log.w(TAG, "Couldn't set content description via JB-MR2 API", e);
              }
          }
          return info;
      }
  
      public static Drawable getThemeUpIndicator(Activity activity) {
          final TypedArray a = activity.obtainStyledAttributes(THEME_ATTRS);
          final Drawable result = a.getDrawable(0);
          a.recycle();
          return result;
      }
  
      private static class SetIndicatorInfo {
          public Method setHomeAsUpIndicator;
          public Method setHomeActionContentDescription;
          public ImageView upIndicatorView;
  
          SetIndicatorInfo(Activity activity) {
              try {
                  setHomeAsUpIndicator = ActionBar.class.getDeclaredMethod("setHomeAsUpIndicator",
                          Drawable.class);
                  setHomeActionContentDescription = ActionBar.class.getDeclaredMethod(
                          "setHomeActionContentDescription", Integer.TYPE);
  
                  // If we got the method we won't need the stuff below.
                  return;
              } catch (NoSuchMethodException e) {
                  // Oh well. We'll use the other mechanism below instead.
              }
  
              final View home = activity.findViewById(android.R.id.home);
              if (home == null) {
                  // Action bar doesn't have a known configuration, an OEM messed with things.
                  return;
              }
  
              final ViewGroup parent = (ViewGroup) home.getParent();
              final int childCount = parent.getChildCount();
              if (childCount != 2) {
                  // No idea which one will be the right one, an OEM messed with things.
                  return;
              }
  
              final View first = parent.getChildAt(0);
              final View second = parent.getChildAt(1);
              final View up = first.getId() == android.R.id.home ? second : first;
  
              if (up instanceof ImageView) {
                  // Jackpot! (Probably...)
                  upIndicatorView = (ImageView) up;
              }
          }
      }
  }
  