For example, you want to set 40% alpha transparence to #000000
(black color), you need to add 66
like this #66000000
.
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/* | |
* Copyright 2014 Chris Banes | |
* | |
* 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 |
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/* | |
* Copyright (C) 2014 darnmason | |
* | |
* 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 |
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import android.support.v7.widget.LinearLayoutManager; | |
import android.support.v7.widget.RecyclerView; | |
public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener { | |
public static String TAG = EndlessRecyclerOnScrollListener.class.getSimpleName(); | |
private int previousTotal = 0; // The total number of items in the dataset after the last load | |
private boolean loading = true; // True if we are still waiting for the last set of data to load. | |
private int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more. | |
int firstVisibleItem, visibleItemCount, totalItemCount; |
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/* | |
* Author: Felipe Herranz (felhr85@gmail.com) | |
* Contributors:Francesco Verheye (verheye.francesco@gmail.com) | |
* Israel Dominguez (dominguez.israel@gmail.com) | |
*/ | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.concurrent.atomic.AtomicBoolean; | |
import android.os.Handler; |
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public class pHash { | |
/** | |
* pHash算法流程 | |
* 1.缩小图片,最佳大小为32*32 | |
* 2.转化成灰度图 | |
* 3.转化为DCT图 | |
* 4.取dct图左上角8*8的范围 | |
* 5.计算所有点的平均值 | |
* 6.8*8的范围刚好64个点,计算出64位的图片指纹,如果小于平均值记为0,反之记为1,指纹顺序可以随机,但是每张图片的指纹的顺序应该保持一致 |