public class MyActivity extends AppCompatActivity {
@Override  //override the function
    protected void onCreate(@Nullable Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       try {
            OkhttpManager.getInstance().setTrustrCertificates(getAssets().open("mycer.cer");
            OkHttpClient mOkhttpClient= OkhttpManager.getInstance().build();
        } catch (IOException e) {
            e.printStackTrace();
        }






body:before {
    background: url(https://www.cnblogs.com/zhijiyiyu/gallery/image/388826.html) center/cover no-repeat;
    content: '';
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.08;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    -webkit-filter: grayscale(40%);
    -moz-filter: grayscale(40%);
    -ms-filter: grayscale(40%);
    -o-filter: grayscale(40%);
    filter: grayscale(40%);
    filter: gray;
}





/*博客园添加markdown代码复制*/

/*添加按钮*/
.cnblogs-markdown pre {
  position: relative;
}
.cnblogs-markdown pre > span {
  position: absolute;
  top: 0;
  right: 0;
  border-radius: 4px;
  padding: 0 16px;
  font-size: 18px;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  cursor: pointer;
  display:none;
}
.cnblogs-markdown pre:hover > span {
  display:block;
}
.cnblogs-markdown pre > .copyed {
  background: #67c23a;
}
/*结束*/












/*字体设置*/
#cnblogs_post_body
{
    color: black;      
    font: 0.875em/1.5em "微软雅黑" , "PTSans" , "Arial" ,sans-serif;
    font-size: 15px;
}
#cnblogs_post_body h1    {
    text-align:center;
    background: #333366;
    border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
    color: #FFFFFF;
    font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
    font-size: 23px;
    font-weight: bold;
    height: 25px;
    line-height: 25px;
    margin: 18px 0 !important;
    padding: 8px 0 5px 5px;
    text-shadow: 2px 2px 3px #222222;
}
#cnblogs_post_body h2    {
    text-align:center;
    background: #006699;
    border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 1px #5F5A4B, 1px 1px 6px 1px rgba(10, 10, 0, 0.5);
    color: #FFFFFF;
    font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
    font-size: 20px;
    font-weight: bold;
    height: 25px;
    line-height: 25px;
    margin: 18px 0 !important;
    padding: 8px 0 5px 5px;
    text-shadow: 2px 2px 3px #222222;
}
/*END*/




/* tinyces 的第二种代码块的 字体大小设置*/
.cnblogs_code,.cnblogs_code span{
    font-size:16px!important;
}
.syntaxhighlighter a, .syntaxhighlighter div,
.syntaxhighlighter code, .syntaxhighlighter table,
.syntaxhighlighter table td, .syntaxhighlighter table tr,
.syntaxhighlighter table tbody, .syntaxhighlighter table thead,
.syntaxhighlighter table caption, .syntaxhighlighter textarea {
    font-size: 16px!important;
}　
/*end*/