1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.support.design.widget; 18 19 import android.graphics.drawable.Drawable; 20 import android.graphics.drawable.DrawableContainer; 21 import android.util.Log; 22 23 import java.lang.reflect.Method; 24 25 /** 26 * Caution. Gross hacks ahead. 27 */ 28 class DrawableUtils { 29 30 private static final String LOG_TAG = "DrawableUtils"; 31 32 private static Method sSetConstantStateMethod; 33 private static boolean sSetConstantStateMethodFetched; 34 35 private DrawableUtils() {} 36 37 static boolean setContainerConstantState(DrawableContainer drawable, 38 Drawable.ConstantState constantState) { 39 // We can use getDeclaredMethod() on v9+ 40 return setContainerConstantStateV9(drawable, constantState); 41 } 42 43 private static boolean setContainerConstantStateV9(DrawableContainer drawable, 44 Drawable.ConstantState constantState) { 45 if (!sSetConstantStateMethodFetched) { 46 try { 47 sSetConstantStateMethod = DrawableContainer.class.getDeclaredMethod( 48 "setConstantState", DrawableContainer.DrawableContainerState.class); 49 sSetConstantStateMethod.setAccessible(true); 50 } catch (NoSuchMethodException e) { 51 Log.e(LOG_TAG, "Could not fetch setConstantState(). Oh well."); 52 } 53 sSetConstantStateMethodFetched = true; 54 } 55 if (sSetConstantStateMethod != null) { 56 try { 57 sSetConstantStateMethod.invoke(drawable, constantState); 58 return true; 59 } catch (Exception e) { 60 Log.e(LOG_TAG, "Could not invoke setConstantState(). Oh well."); 61 } 62 } 63 return false; 64 } 65 } 66
