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Scroller使用分析 - 安诺爱思考 - CSDN博客.html
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<div style="clear:both"></div><div style="border:solid 1px #ccc; background:#eee; float:left; min-width:200px;padding:4px 10px;"><p style="text-align:right;margin:0;"><span style="float:left;">目录<a href="http://blog.csdn.net/a910626/article/details/51548840#" title="系统根据文章中H1到H6标签自动生成文章目录">(?)</a></span><a href="http://blog.csdn.net/a910626/article/details/51548840#" onclick="javascript:return openct(this);" title="展开">[+]</a></p><ol style="display:none;margin-left:14px;padding-left:14px;line-height:160%;"><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t0">一Scroller是什么</a></li><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t1">二这个知识应用场景是可以解决什么问题</a></li><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t2">三该类的常见API</a></li><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t3">四常规的用法是什么</a></li><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t4">五使用时的难点在哪里</a></li><li><a href="http://blog.csdn.net/a910626/article/details/51548840#t5">六一个案例来自android群英传</a></li></ol></div><div style="clear:both"></div><div id="article_content" class="article_content tracking-ad" data-mod="popu_307" data-dsm="post">
<div class="markdown_views"><h2 id="一scroller是什么"><a name="t0" target="_blank"></a>一.Scroller是什么？</h2>
<ul>
<li><p><a href="http://lib.csdn.net/base/android" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">Android</a>里Scroller类是为了实现View平滑滚动的一个Helper类。通常在自定义的View时使用，在View中定义一个私有成员mScroller = new Scroller(context)。设置mScroller滚动的位置时，并不会导致View的滚动，通常是用mScroller记录/计算View滚动的位置，再重写View的computeScroll()，完成实际的滚动。 </p></li>
<li><p>Scroller只是个计算器，提供插值计算，让滚动过程具有动画属性，但它并不是UI，也不是辅助UI滑动，反而是单纯地为滑动提供计算。</p></li>
<li><p>无论从构造方法还是其他方法，以及Scroller的属性可知，其并不会持有View，辅助ViewGroup滑动。</p></li>
<li><p>Scroller只是提供计算，那谁来调用computeScroll使得ViewGroup滑动</p></li>
<li><p>computeScroll也不是来让ViewGroup滑动的，真正让ViewGroup滑动的是scrollTo,scrollBy。computeScroll的作用是计算ViewGroup如何滑动。而computeScroll是通过draw来调用的。</p></li>
<li><p>computeScroll和Scroller都是计算，两者有啥关系？没有直接的关系。computeScroll和Scroller要是飞得拉关系的话，那就是computeScroll可以参考Scroller计算结果来影响scrollTo,scrollBy,从而使得滑动发生改变。也就是Scroller不会调用computeScroll，反而是computeScroll调用Scroller。</p></li>
<li><p>滑动时连续的，如何让Scroller的计算也是连续的？这个就问到了什么时候调用computeScroll了，如上所说computeScroll调用Scroller，只要computeScroll调用连续，Scroller也会连续，实质上computeScroll的连续性又invalidate方法控制，scrollTo,scrollBy都会调用invalidate，而invalidate回去触发draw,从而computeScroll被连续调用，综上，Scroller也会被连续调用，除非invalidate停止调用。</p></li>
<li><p>computeScroll如何和Scroller的调用过程保持一致？computeScroll参考Scroller影响scrollTo,scrollBy，实质上，为了不重复影响scrollTo,scrollBy，那么Scroller必须终止计算currX，currY。要知道计算有没有终止，需要通过mScroller.computeScrollOffset()</p></li>
</ul>
<h2 id="二这个知识应用场景是可以解决什么问题"><a name="t1" target="_blank"></a>二.这个知识应用场景是？可以解决什么问题？</h2>
<p> 我们在需求实现时，经常遇到view滑动的情况，而scrollTo、scrollBy方法都可以实现view的滑动，但是效果是瞬间完成的，用户体验并不好，我们可以使用scroller或者smoothScrollto（内部也是scroller实现的）来实现平滑移动的效果。常见于自定义view中。</p>
<h2 id="三该类的常见api"><a name="t2" target="_blank"></a>三.该类的常见API？</h2>
<pre class="prettyprint" name="code"><code class="hljs cs has-numbering">mScroller.getCurrX() <span class="hljs-comment">//获取mScroller当前水平滚动的位置 </span>
mScroller.getCurrY() <span class="hljs-comment">//获取mScroller当前竖直滚动的位置 </span>
mScroller.getFinalX() <span class="hljs-comment">//获取mScroller最终停止的水平位置 </span>
mScroller.getFinalY() <span class="hljs-comment">//获取mScroller最终停止的竖直位置 </span>
mScroller.setFinalX(<span class="hljs-keyword">int</span> newX) <span class="hljs-comment">//设置mScroller最终停留的水平位置，没有动画效果，直接跳到目标位置 </span>
mScroller.setFinalY(<span class="hljs-keyword">int</span> newY) <span class="hljs-comment">//设置mScroller最终停留的竖直位置，没有动画效果，直接跳到目标位置 </span>
<span class="hljs-comment">//滚动，startX, startY为开始滚动的位置，dx,dy为滚动的偏移量, duration为完成滚动的时间 </span>
mScroller.startScroll(<span class="hljs-keyword">int</span> startX, <span class="hljs-keyword">int</span> startY, <span class="hljs-keyword">int</span> dx, <span class="hljs-keyword">int</span> dy) <span class="hljs-comment">//使用默认完成时间250ms </span>
mScroller.startScroll(<span class="hljs-keyword">int</span> startX, <span class="hljs-keyword">int</span> startY, <span class="hljs-keyword">int</span> dx, <span class="hljs-keyword">int</span> dy, <span class="hljs-keyword">int</span> duration)
mScroller.computeScrollOffset() <span class="hljs-comment">//返回值为boolean，true说明滚动尚未完成，false说明滚动已经完成。这是一个很重要的方法，通常放在View.computeScroll()中，用来判断是否滚动是否结束。 </span></code><ul class="pre-numbering" style="opacity: 0;"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li></ul><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="./Scroller使用分析 - 安诺爱思考 - CSDN博客_files/save_snippets.png"></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li></ul></pre>
<h2 id="四常规的用法是什么"><a name="t3" target="_blank"></a>四.常规的用法是什么？</h2>
<p> Scroller的基本用法其实还是比较简单的，主要可以分为以下几个步骤： <br>
1. 创建Scroller的实例 <br>
2. 调用startScroll()方法来初始化滚动数据并刷新界面 <br>
3. 重写computeScroll()方法，并在其内部完成平滑滚动的逻辑 </p>
<h2 id="五使用时的难点在哪里"><a name="t4" target="_blank"></a>五.使用时的难点在哪里？</h2>
<p> 使用的难点在于startScroll的参数含义，然后根据参数含义给出合适的值，因为这个过程涉及<a href="http://lib.csdn.net/base/android" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">android</a>中坐标计算，所以较为复杂。</p>
<pre class="prettyprint" name="code"><code class="hljs cs has-numbering"> <span class="hljs-comment">// void android.widget.Scroller.startScroll(int startX, int startY, int dx, int dy, int duration)</span>
<span class="hljs-comment">// 第一个参数是起始移动的x坐标值，</span>
<span class="hljs-comment">// 第二个是起始移动的y坐标值，</span>
<span class="hljs-comment">// 第三个第四个参数都是移到某点的坐标值-初始的坐标值，即移动的距离值</span>
<span class="hljs-comment">// 而duration 当然就是执行移动的时间。</span>
</code><ul class="pre-numbering" style="opacity: 0;"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank"><img src="./Scroller使用分析 - 安诺爱思考 - CSDN博客_files/save_snippets.png"></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul></pre>
<h2 id="六一个案例来自android群英传"><a name="t5" target="_blank"></a>六.一个案例：来自《android群英传》</h2>
<pre class="prettyprint" name="code"><code class="hljs java has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ScrollerDragView</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">View</span> {</span>
<span class="hljs-keyword">private</span> Scroller mScroller;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">int</span> mLastX;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">int</span> mLastY;
<span class="hljs-keyword">public</span> <span class="hljs-title">ScrollerDragView</span>(Context context) {
<span class="hljs-keyword">super</span>(context);
initView(context);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">ScrollerDragView</span>(Context context, AttributeSet attrs) {
<span class="hljs-keyword">super</span>(context, attrs);
initView(context);
}
<span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">initView</span>(Context context) {
setBackgroundColor(Color.BLUE);
mScroller = <span class="hljs-keyword">new</span> Scroller(context);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onTouchEvent</span>(MotionEvent event) {
<span class="hljs-keyword">int</span> x = (<span class="hljs-keyword">int</span>) event.getX();
<span class="hljs-keyword">int</span> y = (<span class="hljs-keyword">int</span>) event.getY();
<span class="hljs-keyword">switch</span> (event.getAction()) {
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
mLastX = (<span class="hljs-keyword">int</span>) event.getX();
mLastY = (<span class="hljs-keyword">int</span>) event.getY();
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
<span class="hljs-keyword">int</span> offsetX = x - mLastX;
<span class="hljs-keyword">int</span> offsetY = y - mLastY;
<span class="hljs-comment">// 貌似使用了getParent，就不再需要重置x，y的坐标了</span>
((View)getParent()).scrollBy(-offsetX, -offsetY);
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
View viewGroup = (View) getParent();
mScroller.startScroll(viewGroup.getScrollX(),
viewGroup.getScrollY(),
-viewGroup.getScrollX(),
-viewGroup.getScrollY());
invalidate();
<span class="hljs-keyword">break</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}
<span class="hljs-javadoc">/**
* 这里不需要特别的理解，只要使用Scroller，这里都是一样的
*/</span>
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">computeScroll</span>() {
<span class="hljs-keyword">super</span>.computeScroll();
<span class="hljs-keyword">if</span> (mScroller.computeScrollOffset()) {
((View)getParent()).scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
invalidate();
}
}
}
</code><ul class="pre-numbering" style="opacity: 0;"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li></ul><div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank"><img src="./Scroller使用分析 - 安诺爱思考 - CSDN博客_files/save_snippets.png"></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li></ul></pre></div>
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