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/*
* Copyright (C) 2013 Square, Inc.
*
* 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.squareup.picasso;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import static com.squareup.picasso.Picasso.LoadedFrom;
/**
* Represents an arbitrary listener for image loading.
* <p/>
* Objects implementing this class <strong>must</strong> have a working implementation of
* {@link #equals(Object)} and {@link #hashCode()} for proper storage internally. Instances of this
* interface will also be compared to determine if view recycling is occurring. It is recommended
* that you add this interface directly on to a custom view type when using in an adapter to ensure
* correct recycling behavior.
*/
public interface Target {
/**
* Callback when an image has been successfully loaded.
* <p/>
* <strong>Note:</strong> You must not recycle the bitmap.
*/
void onBitmapLoaded(Bitmap bitmap, LoadedFrom from);
/** Callback indicating the image could not be successfully loaded. */
void onBitmapFailed(Drawable errorDrawable);
/** Callback invoked right before your request is submitted. */
void onPrepareLoad(Drawable placeHolderDrawable);
}
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