/*******************************************************************************
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* Copyright 2013-2014 Sergey Tarasevich
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.nostra13.universalimageloader.core.imageaware;
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import android.graphics.Bitmap;
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import android.graphics.drawable.AnimationDrawable;
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import android.graphics.drawable.Drawable;
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import android.view.View;
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import android.widget.ImageView;
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import com.nostra13.universalimageloader.core.assist.ViewScaleType;
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import com.nostra13.universalimageloader.utils.L;
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import java.lang.reflect.Field;
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/**
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* Wrapper for Android {@link android.widget.ImageView ImageView}. Keeps weak reference of ImageView to prevent memory
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* leaks.
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @since 1.9.0
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*/
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public class ImageViewAware extends ViewAware {
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/**
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* Constructor. <br />
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* References {@link #ImageViewAware(android.widget.ImageView, boolean) ImageViewAware(imageView, true)}.
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*
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* @param imageView {@link android.widget.ImageView ImageView} to work with
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*/
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public ImageViewAware(ImageView imageView) {
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super(imageView);
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}
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/**
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* Constructor
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*
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* @param imageView {@link android.widget.ImageView ImageView} to work with
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* @param checkActualViewSize <b>true</b> - then {@link #getWidth()} and {@link #getHeight()} will check actual
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* size of ImageView. It can cause known issues like
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* <a href="https://github.com/nostra13/Android-Universal-Image-Loader/issues/376">this</a>.
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* But it helps to save memory because memory cache keeps bitmaps of actual (less in
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* general) size.
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* <p/>
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* <b>false</b> - then {@link #getWidth()} and {@link #getHeight()} will <b>NOT</b>
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* consider actual size of ImageView, just layout parameters. <br /> If you set 'false'
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* it's recommended 'android:layout_width' and 'android:layout_height' (or
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* 'android:maxWidth' and 'android:maxHeight') are set with concrete values. It helps to
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* save memory.
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* <p/>
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*/
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public ImageViewAware(ImageView imageView, boolean checkActualViewSize) {
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super(imageView, checkActualViewSize);
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}
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/**
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* {@inheritDoc}
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* <br />
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* 3) Get <b>maxWidth</b>.
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*/
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@Override
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public int getWidth() {
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int width = super.getWidth();
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if (width <= 0) {
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ImageView imageView = (ImageView) viewRef.get();
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if (imageView != null) {
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width = getImageViewFieldValue(imageView, "mMaxWidth"); // Check maxWidth parameter
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}
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}
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return width;
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}
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/**
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* {@inheritDoc}
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* <br />
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* 3) Get <b>maxHeight</b>
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*/
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@Override
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public int getHeight() {
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int height = super.getHeight();
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if (height <= 0) {
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ImageView imageView = (ImageView) viewRef.get();
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if (imageView != null) {
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height = getImageViewFieldValue(imageView, "mMaxHeight"); // Check maxHeight parameter
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}
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}
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return height;
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}
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@Override
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public ViewScaleType getScaleType() {
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ImageView imageView = (ImageView) viewRef.get();
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if (imageView != null) {
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return ViewScaleType.fromImageView(imageView);
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}
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return super.getScaleType();
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}
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@Override
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public ImageView getWrappedView() {
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return (ImageView) super.getWrappedView();
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}
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@Override
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protected void setImageDrawableInto(Drawable drawable, View view) {
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((ImageView) view).setImageDrawable(drawable);
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if (drawable instanceof AnimationDrawable) {
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((AnimationDrawable)drawable).start();
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}
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}
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@Override
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protected void setImageBitmapInto(Bitmap bitmap, View view) {
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((ImageView) view).setImageBitmap(bitmap);
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}
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private static int getImageViewFieldValue(Object object, String fieldName) {
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int value = 0;
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try {
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Field field = ImageView.class.getDeclaredField(fieldName);
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field.setAccessible(true);
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int fieldValue = (Integer) field.get(object);
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if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE) {
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value = fieldValue;
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}
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} catch (Exception e) {
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L.e(e);
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}
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return value;
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}
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}
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