| /* |
| * Copyright (C) 2014 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. |
| */ |
| |
| |
| package androidx.appcompat.app; |
| |
| import android.R; |
| import android.app.ActionBar; |
| import android.app.Activity; |
| import android.content.res.TypedArray; |
| import android.graphics.drawable.Drawable; |
| import android.os.Build; |
| 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. |
| * |
| * Moved from Support-v4 |
| */ |
| class ActionBarDrawerToggleHoneycomb { |
| private static final String TAG = "ActionBarDrawerToggleHC"; |
| |
| private static final int[] THEME_ATTRS = new int[] { |
| R.attr.homeAsUpIndicator |
| }; |
| |
| public static SetIndicatorInfo setActionBarUpIndicator(Activity activity, |
| Drawable drawable, int contentDescRes) { |
| SetIndicatorInfo info = new SetIndicatorInfo(activity); |
| if (info.setHomeAsUpIndicator != null) { |
| try { |
| final ActionBar actionBar = activity.getActionBar(); |
| info.setHomeAsUpIndicator.invoke(actionBar, drawable); |
| info.setHomeActionContentDescription.invoke(actionBar, contentDescRes); |
| } catch (Exception e) { |
| Log.w(TAG, "Couldn't set home-as-up indicator via JB-MR2 API", e); |
| } |
| } else if (info.upIndicatorView != null) { |
| info.upIndicatorView.setImageDrawable(drawable); |
| } else { |
| Log.w(TAG, "Couldn't set home-as-up indicator"); |
| } |
| return info; |
| } |
| |
| public static SetIndicatorInfo setActionBarDescription(SetIndicatorInfo info, Activity activity, |
| int contentDescRes) { |
| if (info == null) { |
| info = new SetIndicatorInfo(activity); |
| } |
| if (info.setHomeAsUpIndicator != null) { |
| try { |
| final ActionBar actionBar = activity.getActionBar(); |
| info.setHomeActionContentDescription.invoke(actionBar, contentDescRes); |
| if (Build.VERSION.SDK_INT <= 19) { |
| // For API 19 and earlier, we need to manually force the |
| // action bar to generate a new content description. |
| actionBar.setSubtitle(actionBar.getSubtitle()); |
| } |
| } 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; |
| } |
| |
| 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; |
| } |
| } |
| } |
| |
| private ActionBarDrawerToggleHoneycomb() { |
| } |
| } |