Android Open Source - Android-Universal-Image-Loader Image View Aware

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Apache License
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Java Source Code

/*******************************************************************************
 * Copyright 2013-2014 Sergey Tarasevich
 *//w w w.ja va 2  s.c om
 * 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 com.nostra13.universalimageloader.core.imageaware;

import android.graphics.Bitmap;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;
import com.nostra13.universalimageloader.core.assist.ViewScaleType;
import com.nostra13.universalimageloader.utils.L;

import java.lang.reflect.Field;

/**
 * Wrapper for Android {@link android.widget.ImageView ImageView}. Keeps weak reference of ImageView to prevent memory
 * leaks.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.9.0
 */
public class ImageViewAware extends ViewAware {

  /**
   * Constructor. <br />
   * References {@link #ImageViewAware(android.widget.ImageView, boolean) ImageViewAware(imageView, true)}.
   *
   * @param imageView {@link android.widget.ImageView ImageView} to work with
   */
  public ImageViewAware(ImageView imageView) {
    super(imageView);
  }

  /**
   * Constructor
   *
   * @param imageView           {@link android.widget.ImageView ImageView} to work with
   * @param checkActualViewSize <b>true</b> - then {@link #getWidth()} and {@link #getHeight()} will check actual
   *                            size of ImageView. It can cause known issues like
   *                            <a href="https://github.com/nostra13/Android-Universal-Image-Loader/issues/376">this</a>.
   *                            But it helps to save memory because memory cache keeps bitmaps of actual (less in
   *                            general) size.
   *                            <p/>
   *                            <b>false</b> - then {@link #getWidth()} and {@link #getHeight()} will <b>NOT</b>
   *                            consider actual size of ImageView, just layout parameters. <br /> If you set 'false'
   *                            it's recommended 'android:layout_width' and 'android:layout_height' (or
   *                            'android:maxWidth' and 'android:maxHeight') are set with concrete values. It helps to
   *                            save memory.
   *                            <p/>
   */
  public ImageViewAware(ImageView imageView, boolean checkActualViewSize) {
    super(imageView, checkActualViewSize);
  }

  /**
   * {@inheritDoc}
   * <br />
   * 3) Get <b>maxWidth</b>.
   */
  @Override
  public int getWidth() {
    int width = super.getWidth();
    if (width <= 0) {
      ImageView imageView = (ImageView) viewRef.get();
      if (imageView != null) {
        width = getImageViewFieldValue(imageView, "mMaxWidth"); // Check maxWidth parameter
      }
    }
    return width;
  }

  /**
   * {@inheritDoc}
   * <br />
   * 3) Get <b>maxHeight</b>
   */
  @Override
  public int getHeight() {
    int height = super.getHeight();
    if (height <= 0) {
      ImageView imageView = (ImageView) viewRef.get();
      if (imageView != null) {
        height = getImageViewFieldValue(imageView, "mMaxHeight"); // Check maxHeight parameter
      }
    }
    return height;
  }

  @Override
  public ViewScaleType getScaleType() {
    ImageView imageView = (ImageView) viewRef.get();
    if (imageView != null) {
      return ViewScaleType.fromImageView(imageView);
    }
    return super.getScaleType();
  }

  @Override
  public ImageView getWrappedView() {
    return (ImageView) super.getWrappedView();
  }

  @Override
  protected void setImageDrawableInto(Drawable drawable, View view) {
    ((ImageView) view).setImageDrawable(drawable);
    if (drawable instanceof AnimationDrawable) {
      ((AnimationDrawable)drawable).start();
    }
  }

  @Override
  protected void setImageBitmapInto(Bitmap bitmap, View view) {
    ((ImageView) view).setImageBitmap(bitmap);
  }

  private static int getImageViewFieldValue(Object object, String fieldName) {
    int value = 0;
    try {
      Field field = ImageView.class.getDeclaredField(fieldName);
      field.setAccessible(true);
      int fieldValue = (Integer) field.get(object);
      if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE) {
        value = fieldValue;
      }
    } catch (Exception e) {
      L.e(e);
    }
    return value;
  }
}
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