ImageViewUtils.java
/*
* Copyright (C) 2017 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.transition;
import android.annotation.SuppressLint;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import java.lang.reflect.Field;
class ImageViewUtils {
/**
* False when linking of the hidden animateTransform method has previously failed.
*/
private static boolean sTryHiddenAnimateTransform = true;
private static Field sDrawMatrixField;
private static boolean sDrawMatrixFieldFetched;
/**
* Sets the matrix to animate the content of the image view.
*/
static void animateTransform(@NonNull ImageView view, @Nullable Matrix matrix) {
if (Build.VERSION.SDK_INT >= 29) {
view.animateTransform(matrix);
} else if (matrix == null) {
// There is a bug in ImageView.animateTransform() prior to Q so paddings are
// ignored when matrix is null.
Drawable drawable = view.getDrawable();
if (drawable != null) {
int vwidth = view.getWidth() - view.getPaddingLeft() - view.getPaddingRight();
int vheight = view.getHeight() - view.getPaddingTop() - view.getPaddingBottom();
drawable.setBounds(0, 0, vwidth, vheight);
view.invalidate();
}
} else if (Build.VERSION.SDK_INT >= 21) {
hiddenAnimateTransform(view, matrix);
} else {
Drawable drawable = view.getDrawable();
if (drawable != null) {
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
Matrix drawMatrix = null;
fetchDrawMatrixField();
if (sDrawMatrixField != null) {
try {
drawMatrix = (Matrix) sDrawMatrixField.get(view);
if (drawMatrix == null) {
drawMatrix = new Matrix();
sDrawMatrixField.set(view, drawMatrix);
}
} catch (IllegalAccessException ignore) {
// Do nothing
}
}
if (drawMatrix != null) {
drawMatrix.set(matrix);
}
view.invalidate();
}
}
}
@RequiresApi(21)
@SuppressLint("NewApi") // Lint doesn't know about the hidden method.
private static void hiddenAnimateTransform(@NonNull ImageView view, @Nullable Matrix matrix) {
if (sTryHiddenAnimateTransform) {
// Since this was an @hide method made public, we can link directly against it with
// a try/catch for its absence instead of doing the same through reflection.
try {
view.animateTransform(matrix);
} catch (NoSuchMethodError e) {
sTryHiddenAnimateTransform = false;
}
}
}
private static void fetchDrawMatrixField() {
if (!sDrawMatrixFieldFetched) {
try {
sDrawMatrixField = ImageView.class.getDeclaredField("mDrawMatrix");
sDrawMatrixField.setAccessible(true);
} catch (NoSuchFieldException ignore) {
// Do nothing
}
sDrawMatrixFieldFetched = true;
}
}
private ImageViewUtils() {
}
}