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I made a simple application, which just download some data from internet and then process it continuously. But I found that after a half or some time application stops working when screen is turned off. And there is no error on application. It seems like application restarted and every thing normal,just not downloading data. Here is my code.
class RequestTask extends AsyncTask&String, String, String&{
protected String doInBackground(String... url) {
// constants
int timeoutSocket = 5000;
int timeoutConnection = 5000;
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
HttpClient client = new DefaultHttpClient(httpParameters);
System.out.println(GlobalVariables.getRandomString(15));
HttpGet httpget = new HttpGet(url[0] + "?id=" + GlobalVariables.getRandomString(15));
HttpResponse getResponse = client.execute(httpget);
getResponse.addHeader("Cache-Control:", "no-cache");
final int statusCode = getResponse.getStatusLine().getStatusCode();
if(statusCode != HttpStatus.SC_OK) {
Log.w("MyApp", "Download Error: " + statusCode + "| for URL: " + url);
String line = "";
StringBuilder total = new StringBuilder();
HttpEntity getResponseEntity = getResponse.getEntity();
BufferedReader reader = new BufferedReader(new InputStreamReader(getResponseEntity.getContent()));
while((line = reader.readLine()) != null) {
total.append(line);
total.append("\n");
line = total.toString();
} catch (Exception e) {
Log.w("MyApp", "Download Exception : " + e.toString());
protected void onPreExecute() {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: Downloading Data, Please Wait....");
protected void onPostExecute(String result) {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: Downloading Complete.");
if(result.toString().length() & 10) {
errorcount = 0;
MyMessageDetails D
String[] mydata = result.split("\\|s\\|");
for (String value : mydata)
if (value.contains("|")){
String[] details = value.split("\\|n\\|");
String mymsg =
Detail = new MyMessageDetails();
Detail.setIcon(R.drawable.ic_launcher);
for (String mydetail : details)
if (mydetail.startsWith("_From:_")){
mymsg = "From: " + mydetail.replace("_From:_", "")+ "\n";
Detail.setMsgBody(mymsg);
titles.add(Detail);
if (titles.size() & 0){
ListView listView1 = (ListView)findViewById(R.id.lstmsgs);
ca = new CustomAdapter(titles , MainActivity.this);
listView1.setAdapter(ca);
if (StartInfo){
new RequestTask().execute(BaseUrl);
if (StartInfo){
new RequestTask().execute(BaseUrl);
} catch(NullPointerException e) {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: " + "Error: " + e.getCause());
LogCat look like this.
09-08 22:16:32.650: D/jdwp(9057): sendBufferedRequest : len=0x3F
09-08 22:16:32.713: D/ActivityThread(9057): BIND_APPLICATION handled : 0 / AppBindData{appInfo=ApplicationInfo{417d01d0 com.golden.smsserver}}
09-08 22:16:32.788: D/ThemeManager(9057): contextandroid.app.ContextImpl@417d2460
09-08 22:16:32.788: D/ThemeManager(9057): create ThemeManager object
09-08 22:16:32.789: D/ThemeManager(9057): Res_clear()
09-08 22:16:32.806: D/ThemeManager(9057): packageName=====com.golden.smsserver
09-08 22:16:32.809: D/ThemeManager(9057): packageName=com.golden.smsserver
09-08 22:16:32.810: V/Provider/Setting(9057): invalidate [system]: current 25 != cached 0
09-08 22:16:32.813: D/RRR(9057): path=other/bottom/bottom7.png
09-08 22:16:32.872: D/ThemeManager(9057): sIconWidth=64----sIconHeight=64
09-08 22:16:32.875: D/ThemeManagerHH(9057): infoDrawable=72
09-08 22:16:33.000: D/dalvikvm(9057): threadid=11: interp stack at 0x4c0b0000
09-08 22:16:33.000: D/dalvikvm(9057): threadid=11: calling run()
09-08 22:16:33.007: D/dalvikvm(9057): threadid=11: exiting
09-08 22:16:33.008: D/dalvikvm(9057): threadid=11: bye!
09-08 22:16:33.008: D/dalvikvm(9057): threadid=0: freeing
09-08 22:16:33.009: D/ActivityThread(9057): ACT-AM_ON_RESUME_CALLED ActivityRecord{417d1800 token=android.os.BinderProxy@417d1038 {com.golden.smsserver/com.golden.smsserver.MainActivity}}
09-08 22:16:33.029: D/ActivityThread(9057): ACT-LAUNCH_ACTIVITY handled : 0 / ActivityRecord{417d1800 token=android.os.BinderProxy@417d1038 {com.golden.smsserver/com.golden.smsserver.MainActivity}}
09-08 22:16:33.117: D/libEGL(9057): loaded /system/lib/egl/libGLES_android.so
09-08 22:16:33.126: D/libEGL(9057): loaded /vendor/lib/egl/libEGL_mtk.so
09-08 22:16:33.147: D/libEGL(9057): loaded /vendor/lib/egl/libGLESv1_CM_mtk.so
09-08 22:16:33.156: D/libEGL(9057): loaded /vendor/lib/egl/libGLESv2_mtk.so
09-08 22:16:33.243: D/OpenGLRenderer(9057): Enabling debug mode 0
09-08 22:16:36.226: D/dalvikvm(9057): threadid=11: interp stack at 0x4e02e000
09-08 22:16:36.226: D/dalvikvm(9057): threadid=11: calling run()
09-08 22:16:36.229: I/System.out(9057): ns7iqohduryaote
09-08 22:16:36.317: I/System.out(9057): [socket][0] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:36.317: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:36.328: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:36.424: I/System.out(9057): [socket][/192.168.104.101:33406]
09-08 22:16:36.425: I/System.out(9057): rx timeout:5000
09-08 22:16:37.273: D/dalvikvm(9057): threadid=12: interp stack at 0x4e082000
09-08 22:16:37.273: D/dalvikvm(9057): threadid=12: calling run()
09-08 22:16:37.273: I/System.out(9057): 6bui5dlvbf445wr
09-08 22:16:37.299: I/System.out(9057): [socket][1] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:37.300: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:37.300: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:40.457: I/System.out(9057): [socket][/192.168.104.101:34375]
09-08 22:16:40.457: I/System.out(9057): rx timeout:5000
09-08 22:16:41.496: I/System.out(9057): rx timeout:10
09-08 22:16:41.496: I/System.out(9057): rx timeout:5000
09-08 22:16:41.497: I/System.out(9057): rx timeout:10
09-08 22:16:41.497: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:41.497: I/System.out(9057): rx timeout:5000
09-08 22:16:41.497: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:41.499: I/System.out(9057): [CDS]close[34375]
09-08 22:16:41.501: I/System.out(9057): close [socket][/0.0.0.0:34375]
09-08 22:16:41.502: I/System.out(9057): close [socket][/0.0.0.0:34375]
09-08 22:16:41.513: D/dalvikvm(9057): threadid=13: interp stack at 0x4e223000
09-08 22:16:41.513: D/dalvikvm(9057): threadid=13: calling run()
09-08 22:16:41.514: I/System.out(9057): urz5mb57hes3124
09-08 22:16:41.549: I/System.out(9057): [socket][2] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:41.549: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:41.550: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:41.640: I/System.out(9057): [socket][/192.168.104.101:36147]
09-08 22:16:41.640: I/System.out(9057): rx timeout:5000
09-08 22:16:42.206: I/System.out(9057): rx timeout:10
09-08 22:16:42.210: I/System.out(9057): [CDS]EAGAIN or EWOULDBLOCK in Recvfrom
09-08 22:16:42.210: I/System.out(9057): [CDS]read is 0
09-08 22:16:42.211: I/System.out(9057): rx timeout:5000
09-08 22:16:42.211: I/System.out(9057): rx timeout:10
09-08 22:16:42.219: I/System.out(9057): rx timeout:5000
09-08 22:16:42.219: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:42.219: I/System.out(9057): [CDS]close[36147]
09-08 22:16:42.220: I/System.out(9057): close [socket][/0.0.0.0:36147]
09-08 22:16:42.220: I/System.out(9057): close [socket][/0.0.0.0:36147]
09-08 22:16:42.229: D/dalvikvm(9057): threadid=14: interp stack at 0x4e22b000
09-08 22:16:42.229: D/dalvikvm(9057): threadid=14: calling run()
09-08 22:16:42.230: I/System.out(9057): whm0kske88z9hwr
09-08 22:16:42.233: I/System.out(9057): [socket][3] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:42.234: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:42.235: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:42.238: I/System.out(9057): [socket][/192.168.104.101:57208]
09-08 22:16:42.238: I/System.out(9057): rx timeout:5000
09-08 22:16:42.759: I/System.out(9057): rx timeout:10
09-08 22:16:42.760: I/System.out(9057): [CDS]EAGAIN or EWOULDBLOCK in Recvfrom
09-08 22:16:42.760: I/System.out(9057): [CDS]read is 0
09-08 22:16:42.760: I/System.out(9057): rx timeout:5000
09-08 22:16:42.760: I/System.out(9057): rx timeout:10
09-08 22:16:42.761: I/System.out(9057): rx timeout:5000
09-08 22:16:42.761: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:42.761: I/System.out(9057): [CDS]close[57208]
09-08 22:16:42.762: I/System.out(9057): close [socket][/0.0.0.0:57208]
09-08 22:16:42.762: I/System.out(9057): close [socket][/0.0.0.0:57208]
09-08 22:16:42.763: D/dalvikvm(9057): threadid=15: interp stack at 0x4e233000
09-08 22:16:42.764: D/dalvikvm(9057): threadid=15: calling run()
09-08 22:16:42.765: I/System.out(9057): 769h9vhnoeafrbi
09-08 22:16:42.768: I/System.out(9057): [socket][4] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:42.770: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:42.773: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:42.775: I/System.out(9057): [socket][/192.168.104.101:60430]
09-08 22:16:42.775: I/System.out(9057): rx timeout:5000
09-08 22:16:43.335: I/System.out(9057): rx timeout:10
09-08 22:16:43.340: I/System.out(9057): [CDS]EAGAIN or EWOULDBLOCK in Recvfrom
09-08 22:16:43.340: I/System.out(9057): [CDS]read is 0
09-08 22:16:43.341: I/System.out(9057): rx timeout:5000
09-08 22:16:43.341: I/System.out(9057): rx timeout:10
09-08 22:16:43.347: I/System.out(9057): rx timeout:5000
09-08 22:16:43.347: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:43.347: I/System.out(9057): [CDS]close[60430]
09-08 22:16:43.348: I/System.out(9057): close [socket][/0.0.0.0:60430]
09-08 22:16:43.348: I/System.out(9057): close [socket][/0.0.0.0:60430]
09-08 22:16:43.349: I/System.out(9057): 4fmk
09-08 22:16:43.355: I/System.out(9057): [socket][5] connection /192.168.10.9:8080;LocalPort=)
09-08 22:16:43.355: I/System.out(9057): [CDS]connect[/192.168.10.9:8080] tm:5
09-08 22:16:43.356: D/Posix(9057): [Posix_connect Debug]Process com.golden.smsserver :8080
09-08 22:16:43.359: I/System.out(9057): [socket][/192.168.104.101:41743]
09-08 22:16:43.360: I/System.out(9057): rx timeout:5000
09-08 22:16:44.000: I/System.out(9057): rx timeout:10
09-08 22:16:44.010: I/System.out(9057): [CDS]EAGAIN or EWOULDBLOCK in Recvfrom
09-08 22:16:44.010: I/System.out(9057): [CDS]read is 0
09-08 22:16:44.010: I/System.out(9057): rx timeout:5000
09-08 22:16:44.011: I/System.out(9057): rx timeout:10
09-08 22:16:44.012: I/System.out(9057): rx timeout:5000
09-08 22:16:44.012: I/System.out(9057): [CDS]shutdownInput
09-08 22:16:44.012: I/System.out(9057): [CDS]close[41743]
09-08 22:16:44.013: I/System.out(9057): close [socket][/0.0.0.0:41743]
09-08 22:16:44.013: I/System.out(9057): close [socket][/0.0.0.0:41743]
09-08 22:16:44.015: I/System.out(9057): z56eof2knllxpm3
public class MainActivity extends Activity implements android.view.View.OnClickListener{
public boolean StartI
ArrayList&MyMessageDetails& titles = new ArrayList&MyMessageDetails&();
String BaseUrl = My URL
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnsend = (Button) findViewById(R.id.btnsend);
btnsend.setOnClickListener(this);
@SuppressWarnings("deprecation")
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()) {
case R.id.btnsend:
Button btnsend = (Button) findViewById(R.id.btnsend);
EditText etcounter = (EditText) findViewById(R.id.etcounter);
if (StartInfo){
btnsend.setText("Start");
etcounter.setEnabled(true);
StartInfo =
btnsend.setText("Stop");
etcounter.setEnabled(true);
StartInfo =
new RequestTask().execute(BaseUrl);
class RequestTask extends AsyncTask&String, String, String&{
protected String doInBackground(String... url) {
// constants
int timeoutSocket = 5000;
int timeoutConnection = 5000;
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
HttpClient client = new DefaultHttpClient(httpParameters);
System.out.println(GlobalVariables.getRandomString(15));
HttpGet httpget = new HttpGet(url[0] + "?id=" + GlobalVariables.getRandomString(15));
HttpResponse getResponse = client.execute(httpget);
getResponse.addHeader("Cache-Control:", "no-cache");
final int statusCode = getResponse.getStatusLine().getStatusCode();
if(statusCode != HttpStatus.SC_OK) {
Log.w("MyApp", "Download Error: " + statusCode + "| for URL: " + url);
String line = "";
StringBuilder total = new StringBuilder();
HttpEntity getResponseEntity = getResponse.getEntity();
BufferedReader reader = new BufferedReader(new InputStreamReader(getResponseEntity.getContent()));
while((line = reader.readLine()) != null) {
total.append(line);
total.append("\n");
line = total.toString();
} catch (Exception e) {
Log.w("MyApp", "Download Exception : " + e.toString());
protected void onPreExecute() {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: Downloading Data, Please Wait....");
protected void onPostExecute(String result) {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: Downloading Complete.");
if(result.toString().length() & 10) {
MyMessageDetails D
String[] mydata = result.split("\\|s\\|");
for (String value : mydata)
if (value.contains("|")){
String[] details = value.split("\\|n\\|");
String mymsg =
Detail = new MyMessageDetails();
Detail.setIcon(R.drawable.ic_launcher);
for (String mydetail : details)
if (mydetail.startsWith("_From:_")){
mymsg = "From: " + mydetail.replace("_From:_", "")+ "\n";
Detail.setMsgBody(mymsg);
titles.add(Detail);
if (titles.size() & 0){
ListView listView1 = (ListView)findViewById(R.id.lstmsgs);
ca = new CustomAdapter(titles , MainActivity.this);
listView1.setAdapter(ca);
if (StartInfo){
new RequestTask().execute(BaseUrl);
if (StartInfo){
new RequestTask().execute(BaseUrl);
} catch(NullPointerException e) {
TextView txtstatus = (TextView) findViewById(R.id.txtstatus);
txtstatus.setText("Status: " + "Error: " + e.getCause());
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在这种模型中，配置的是非阻塞 I/O，然后使用阻塞 select 系统调用来确定一个 I/O 描述符何时有操作。
使 select 调用非常有趣的是它可以用来为多个描述符提供通知，而不仅仅为一个描述符提供通知。
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http://blog.chinaunix.net/uid--id-3755264.html
三、异步阻塞模式
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在这种模型中，配置的是非阻塞 I/O，然后使用阻塞 select 系统调用来确定一个 I/O 描述符何时有操作。
使 select 调用非常有趣的是它可以用来为多个描述符提供通知，而不仅仅为一个描述符提供通知。
对于每个提示符来说，我们可以请求这个描述符可以写数据、有读数据可用以及是否发生错误的...
网络与安全
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图 1. 基本 linux I/O 模型的简单矩阵
每个 I/O 模型都有自己的使用模式，它们对于特定的应用程序都有自己的优点。
本节将简要对其一一进行介绍。
一、同步阻塞模式
在这个模式中，用户空间的应用程序执行一个系统调用，并阻塞，直到系统调用完成为止(数据传输完成或发生错误)。
* tcp client
#include &stdio.h&
#include &stdlib.h&
#include &sys/socket.h&
架构设计与优化
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