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/* * Copyright 2014 Regional Adult Education Program of Lee, Scott, Wise, and Norton Public Schools *// w w w. ja va 2s . c o m * 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. */ package edu.mecc.race2ged.navigation; 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. * * 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(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() == R.id.home ? second : first; if (up instanceof ImageView) { // Jackpot! (Probably...) upIndicatorView = (ImageView) up; } } } }