public static String getUrlCache(Context context, String url) {
if (TextUtils.isEmpty(url)) {
return null;
}
int netState = NetUtil.getNetworkState(context);
File file = new File(getCacheDir(context) + File.separator + replaceUrlWithPlus(url));
if (file.exists() && file.isFile()) {
long expiredTime = System.currentTimeMillis() - file.lastModified();
Log.i("liweiping", url + ": expiredTime=" + expiredTime / 1000);
// 1. in case the system time is incorrect (the time is turn back
// long ago)
// 2. when the network is invalid, you can only read the cache
if (netState != NetUtil.NETWORN_NONE && expiredTime < 0) {
return null;
}
// 如果是wifi网络，则30分钟过期
if (netState == NetUtil.NETWORN_WIFI && expiredTime > CONFIG_CACHE_WIFI_TIMEOUT) {
return null;
// 如果是手机网络，则2个小时过期
} else if (netState == NetUtil.NETWORN_MOBILE && expiredTime > CONFIG_CACHE_MOBILE_TIMEOUT) {
return null;
}
try {
String result = FileUtils.readTextFile(file);
return result;
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
