The Android status bar background is initially transparent and restores the background color with the slide

<span id="Label3"></p><p><p>Now some applications, the status bar is initially fully transparent, and when the user declines, the status bar transparency is gradually restored, see</p></p><p><p></p></p><p><p></p></p><p><p></p></p><p><p><br></p></p><p><p>This effect is not difficult to achieve, the head of the ListView is set as a picture, the ListView implements the Onscrolllistener event, which can be achieved when the ListView falls down, and the important code is as Follows:</p></p><p>@Override<br>public void onscroll (abslistview listView, int firstvisibleitem,<br>int visibleitemcount, int Totalitemcount) {<br>if (firstvisibleitem = = 0) {<br>Get Header Layout<br>View view = Listview.getchildat (0);<br>If (view! = Null) {<br>Gets the inverse number of the top position of the header layout now<br>int top =-view.gettop ();<br>Gets the height of the header layout<br>int headerheight = View.getheight ();<br>LOG.I ("info", "firstvisibleitem" + firstvisibleitem + ", top:"<br>+ Top + ", headerheight:" + headerheight);<br>When this condition is met, it is the head layout at the top of the Xlistview first control, only this time we adjust the transparency<br>If (top <= headerheight && top >= 0) {<br>Gets the percentage of the head layout height of the current position<br>float f = (float) top/(float) headerheight;<br>Rl_title.getbackground (). setalpha ((int) (f * 255));<br>Notifies the title bar to refresh the display<br>Rl_title.invalidate ();<br>}<br>}<br>} else if (firstvisibleitem > 0) {<br>Rl_title.setbackgroundcolor (color.argb (255, 0, 00, 0));<br>Rl_title.getbackground (). Setalpha (255);<br>} else {<br>Rl_title.getbackground (). Setalpha (0);<br>}<br><br>}</p><p><p><br></p></p><p><p>In fact, the calculation of the ListView drop Distance. Transparency changes as the ListView Slides. When head has slipped, the status bar restores the defined Color.</p></p><p><p><br></p></p><p><p>Full code:</p></p><p><p>http://blog.csdn.net/bisubisu/article/details/47835359<br></p></p><p><p><br></p></p><p><p><br></p></p>This function reference address: http://www.94cto.com/index/Article/content/id/69842.html<p style="font-size:12px;"><p style="font-size:12px;">Copyright Notice: This article for Bo Master original article, without Bo Master permission not Reproduced.</p></p> <p><p>The Android status bar background is initially transparent and restores the background color with the slide</p></p></span>