1/* 2 * Copyright (C) 2017 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 17package android.support.transition; 18 19import android.animation.Animator; 20import android.graphics.Matrix; 21import android.support.annotation.RequiresApi; 22import android.util.Log; 23import android.widget.ImageView; 24 25import java.lang.reflect.InvocationTargetException; 26import java.lang.reflect.Method; 27 28@RequiresApi(21) 29class ImageViewUtilsApi21 implements ImageViewUtilsImpl { 30 31 private static final String TAG = "ImageViewUtilsApi21"; 32 33 private static Method sAnimateTransformMethod; 34 private static boolean sAnimateTransformMethodFetched; 35 36 @Override 37 public void startAnimateTransform(ImageView view) { 38 // Do nothing 39 } 40 41 @Override 42 public void animateTransform(ImageView view, Matrix matrix) { 43 fetchAnimateTransformMethod(); 44 if (sAnimateTransformMethod != null) { 45 try { 46 sAnimateTransformMethod.invoke(view, matrix); 47 } catch (IllegalAccessException e) { 48 // Do nothing 49 } catch (InvocationTargetException e) { 50 throw new RuntimeException(e.getCause()); 51 } 52 } 53 } 54 55 @Override 56 public void reserveEndAnimateTransform(ImageView view, Animator animator) { 57 // Do nothing 58 } 59 60 private void fetchAnimateTransformMethod() { 61 if (!sAnimateTransformMethodFetched) { 62 try { 63 sAnimateTransformMethod = ImageView.class.getDeclaredMethod("animateTransform", 64 Matrix.class); 65 sAnimateTransformMethod.setAccessible(true); 66 } catch (NoSuchMethodException e) { 67 Log.i(TAG, "Failed to retrieve animateTransform method", e); 68 } 69 sAnimateTransformMethodFetched = true; 70 } 71 } 72 73} 74