Created
January 30, 2013 14:00
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Android-BitmapCache (https://github.com/chrisbanes/Android-BitmapCache) CacheableImageView with a fade-in transition display option.
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/******************************************************************************* | |
* Copyright 2011, 2012 Chris Banes. 2013 readyState Software Ltd. | |
* | |
* 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.your.package.name; | |
import uk.co.senab.bitmapcache.CacheableBitmapDrawable; | |
import android.content.Context; | |
import android.graphics.drawable.BitmapDrawable; | |
import android.graphics.drawable.Drawable; | |
import android.graphics.drawable.TransitionDrawable; | |
import android.net.Uri; | |
import android.util.AttributeSet; | |
import android.widget.ImageView; | |
public class CacheableImageView extends ImageView { | |
private static final int FADE_DURATION = 200; | |
private static BitmapDrawable mEmptyDrawable; | |
private static void onDrawableSet(Drawable drawable) { | |
if (drawable instanceof TransitionDrawable) { | |
drawable = ((TransitionDrawable) drawable).getDrawable(1); | |
} | |
if (drawable instanceof CacheableBitmapDrawable) { | |
((CacheableBitmapDrawable) drawable).setBeingUsed(true); | |
} | |
} | |
private static void onDrawableUnset(Drawable drawable) { | |
if (drawable instanceof TransitionDrawable) { | |
drawable = ((TransitionDrawable) drawable).getDrawable(1); | |
} | |
if (drawable instanceof CacheableBitmapDrawable) { | |
((CacheableBitmapDrawable) drawable).setBeingUsed(false); | |
} | |
} | |
public CacheableImageView(Context context) { | |
super(context); | |
} | |
public CacheableImageView(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
} | |
@Override | |
public void setImageDrawable(Drawable drawable) { | |
final Drawable previousDrawable = getDrawable(); | |
// Set new Drawable | |
super.setImageDrawable(drawable); | |
if (drawable != previousDrawable) { | |
onDrawableSet(drawable); | |
onDrawableUnset(previousDrawable); | |
} | |
} | |
public void setImageDrawable(Drawable drawable, boolean withFade) { | |
if (withFade) { | |
if (mEmptyDrawable == null) mEmptyDrawable = new BitmapDrawable(getResources()); | |
TransitionDrawable fadeInDrawable = new TransitionDrawable(new Drawable[] { mEmptyDrawable, drawable }); | |
setImageDrawable(fadeInDrawable); | |
fadeInDrawable.startTransition(FADE_DURATION); | |
} else { | |
setImageDrawable(drawable); | |
} | |
} | |
@Override | |
public void setImageResource(int resId) { | |
final Drawable previousDrawable = getDrawable(); | |
super.setImageResource(resId); | |
onDrawableUnset(previousDrawable); | |
} | |
@Override | |
public void setImageURI(Uri uri) { | |
final Drawable previousDrawable = getDrawable(); | |
super.setImageURI(uri); | |
onDrawableUnset(previousDrawable); | |
} | |
@Override | |
protected void onDetachedFromWindow() { | |
super.onDetachedFromWindow(); | |
// Will cause displayed bitmap wrapper to be 'free-able' | |
setImageDrawable(null); | |
} | |
} |
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