android 4.4

android 4.4 读取短信必须设置为默认短信程序才能读取短信，发送短信不需要

android 4.4 webview 将无法加载about:blank开始的url，需要改成其他自定义的

// The URL scheme should be non-hierarchical (no trailing slashes)private static final String APP_SCHEME = "example-app:";@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {    if (url.startsWith(APP_SCHEME)) {        urlData = URLDecoder.decode(url.substring(APP_SCHEME.length()), "UTF-8");        respondToData(urlData);        return true;    }    return false;}