Button Selector

http://www.oschina.net/question/54100_34076

Custom Progressbar

http://blog.csdn.net/lcore/article/details/8728298
http://my.oschina.net/u/614972/blog/144434
http://www.cnblogs.com/tianzhijiexian/p/3854105.html
http://winwyf.blog.51cto.com/4561999/857867
http://stackoverflow.com/questions/15243553/how-to-implement-this-type-of-progressbar-in-android-using-xml-file
http://www.tiemenschut.com/how-to-customize-android-progress-bars/

android R檔不會更新

http://meebox.blogspot.tw/2012/08/ooxx-eclipse-rjava.html

Java百分比

http://zhidao.baidu.com/question/575912742.html
注意 必須使用Double
若用Int/Int 你會得到0%

VideoView OnClickListener?

http://stackoverflow.com/questions/6175456/android-why-cant-i-give-an-onclicklistener-to-a-videoview

Java 小數第幾位

float fcalc = (float)3.14159;
NumberFormat nf = NumberFormat.getInstance();
nf.setMaximumFractionDigits( 2 );    //小數後兩位
System.out.println( "a / b = " nf.format( fcalc ) );