我正在开发的 Android 应用程序需要每 5 秒在我的服务器上请求一个页面，但我担心这会消耗大量电池，有没有更简单的方法？我当前的方法是每 5 秒循环一次的服务：
protected void onHandleIntent(Intent intent) {
while (true){
long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.***.***/***/request_sms.php");
String HTML = "";
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HTML = EntityUtils.toString(response.getEntity());
} catch (ClientProtocolException e) {} catch (IOException e) {}
if(HTML.indexOf("[NO TEXTS]") > 0) {
} else {
Vector<String> all_sms = getBetweenAll(HTML, "<sms>", "<sms>");
for(int i = 0, size = all_sms.size(); i < size; i++) {
String from = getBetween(all_sms.get(i), "<from>", "</from>");
String to = getBetween(all_sms.get(i), "<to>", "</to>");
String msg = getBetween(all_sms.get(i), "<msg>", "</msg>");
String sent = getBetween(all_sms.get(i), "<sent>", "</sent>");
String HTML1 = "";
HttpClient httpclient1 = new DefaultHttpClient();
HttpPost httppost1 = new HttpPost("http://www.***.***/***/add_sms.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("from", from));
nameValuePairs.add(new BasicNameValuePair("to", to));
nameValuePairs.add(new BasicNameValuePair("msg", msg));
nameValuePairs.add(new BasicNameValuePair("sent", sent));
httppost1.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response1 = httpclient1.execute(httppost1);
HTML1 = EntityUtils.toString(response1.getEntity());
HN.post(new DisplayToast(HTML1));
} catch (ClientProtocolException e) {} catch (IOException e) {}
}
}
} catch (Exception e) {
}
}
}
}
}
是否有理由需要每 5 秒检查一次？您最好让服务器向设备推送通知（通过 c2dm），告知何时有可用更新。如果您不断轮询服务器，无论您如何实现，您都会耗尽电池。
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