我正在开发一个连接到网站并从中获取数据的应用程序。我遇到的问题是，当我尝试检查网站是否有效时，有时它会在我的应用程序中显示其离线状态，但当我在浏览器上尝试使用相同的网站时，它正在工作。我已经尝试 HttpURLConnection 检查响应时间，如果它等于 200 返回 true ，但大多数情况下它没有 work.It表明网站不在线。我使用线程给asynctask一些延迟，但仍然不能完美。
这是代码。
package com.bu.innovate.bustudentportal;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.pnikosis.materialishprogress.ProgressWheel;
import java.io.File;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
public class Splash_Activity extends Activity implements Animation.AnimationListener {
UserSessionManager session;
Data data;
ProgressWheel progress;
boolean check;
String url = "";
FileInputStream inputStream;
String filename = "newMyProfileData";
Animation animFadein;
Animation animFadeout;
LinearLayout linearLayout;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
boolean finish = getIntent().getBooleanExtra("finish", false);
if (finish) {
finish();
return;
}
setContentView(R.layout.splast_activty);
linearLayout = (LinearLayout) findViewById(R.id.splash);
progress = (ProgressWheel) findViewById(R.id.progressbar);
session = new UserSessionManager(getApplicationContext());
HashMap<String, String> user = session.getUserDetails();
url = user.get(UserSessionManager.KEY_URL);
animFadein = AnimationUtils.loadAnimation(this,
R.anim.blink);
animFadeout = AnimationUtils.loadAnimation(this,
R.anim.fade_out);
animFadein.setAnimationListener(this);
animFadeout.setAnimationListener(this);
animFadein.setDuration(1300);
animFadeout.setDuration(1000);
animFadeout.setStartOffset(1200 + animFadein.getStartOffset() + 1200);
data = new Data(getApplicationContext());
progress.spin();
if(animFadein!=null)
{
linearLayout.startAnimation(animFadein);
}
if (!session.checkLogin() && isOnline()) {
final Handler handler2 = new Handler();
handler2.postDelayed(new Runnable() {
@Override
public void run() {
new checkingnetwork().execute();
}
}, 2000);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
getcheck();
}
}, 5000);
}
else if (!session.checkLogin() && !isOnline()) {
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
getcheck();
}
}, 4000);
} else {
getcheck();
}
}
public void getcheck() {
if (!data.isOnline() && !session.checkLogin()) {
MyProfile_Data data_file;
new MyProfile_Data();
try {
File filew = new File(Splash_Activity.this.getCacheDir(), filename);
inputStream = new FileInputStream(filew);
ObjectInputStream input = new ObjectInputStream(inputStream);
data_file = (MyProfile_Data) input.readObject();
Data.name_person = data_file.getName();
Data.name_enroll = data_file.getEnrollment();
} catch (Exception e) {
e.printStackTrace();
}
Intent myIntent = new Intent(getBaseContext(), Navigation_drawer.class);
startActivityForResult(myIntent, 0);
} else if (isOnline()) {
if (check && !session.checkLogin()) {
Data.checkwebsite = check;
new Login_Activity_Again(Splash_Activity.this).execute();
} else if (!session.checkLogin() && !check) {
MyProfile_Data data_file;
new MyProfile_Data();
try {
File filew = new File(Splash_Activity.this.getCacheDir(), filename);
inputStream = new FileInputStream(filew);
ObjectInputStream input = new ObjectInputStream(inputStream);
data_file = (MyProfile_Data) input.readObject();
Data.name_person = data_file.getName();
Data.name_enroll = data_file.getEnrollment();
} catch (Exception e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "Cannot connect to the webserver.Going into offline mode",
Toast.LENGTH_LONG).show();
Data.w_check = 1;
Intent myIntent = new Intent(getBaseContext(), Navigation_drawer.class);
startActivityForResult(myIntent, 0);
}
} else {
if (session.checkLogin())
finish();
}
}
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
//should check null because in air plan mode it will be null
return (netInfo != null && netInfo.isConnected());
}
@Override
public void onAnimationStart(Animation animation) {
// linearLayout.startAnimation(animFadein);
}
@Override
public void onAnimationEnd(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
public class checkingnetwork extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
try {
// FIRST METHOD I TRIED
HttpURLConnection urlc = (HttpURLConnection) (new URL(url).openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(3000);
urlc.connect();
check = (urlc.getResponseCode() == 200);
// SECOND METHOD I TRIED
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
connection.setRequestMethod("HEAD");
int responseCode = connection.getResponseCode();
check = (200 <= responseCode && responseCode <= 399);
System.out.print(responseCode);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
}
logcat就在这里..
1-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Static: SBServiceAPI: getService class android.os.ServiceManager
01-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Static: isShipBuild true
01-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Thread-18855-353874012: SmartBonding Enabling is true, SHIP_BUILD is true, log to file is false, DBG is false
01-11 23:04:26.204 10320-10320/com.bu.innovate.bustudentportal D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
01-11 23:04:27.824 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_launch_request id:com.bu.innovate.bustudentportal time:27606813
01-11 23:04:27.984 10320-10320/com.bu.innovate.bustudentportal D/debug: Screen inches : 5.2007338145504045
01-11 23:04:27.994 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/abc_ic_ab_back_mtrl_am_alpha.png
01-11 23:04:28.024 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable/header.jpg
01-11 23:04:28.114 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/profile_picture.png
01-11 23:04:28.204 10320-10320/com.bu.innovate.bustudentportal D/Activity: performCreate Call secproduct feature valuefalse
01-11 23:04:28.204 10320-10320/com.bu.innovate.bustudentportal D/Activity: performCreate Call debug elastic valuetrue
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/tick_logo.png
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/time_logo.png
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/result_logo.png
01-11 23:04:28.274 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.294 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.324 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.334 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/profile_logo.png
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/progress_logo.png
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/notification_logo.png
01-11 23:04:28.494 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/eva.png
01-11 23:04:28.494 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/password_logo.png
01-11 23:04:28.504 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/feedback_logo.png
01-11 23:04:28.514 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/privacy_logo.png
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{3bfd695e V.ED.... ......ID 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{1db4b13f V.ED.... ......I. 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{9aada0c V.ED.... ......I. 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.644 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@12a519a2 time:27607635
01-11 23:04:28.644 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@29c55571 time:27607635
01-11 23:04:30.024 10320-10638/com.bu.innovate.bustudentportal W/System.err: java.net.SocketTimeoutException
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:37)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okio.Okio$2.read(Okio.java:116)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okio.RealBufferedSource.indexOf(RealBufferedSource.java:150)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:97)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:198)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:119)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:777)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:379)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:491)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.bu.innovate.bustudentportal.Splash_Activity$checkingnetwork.doInBackground(Splash_Activity.java:223)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at com.bu.innovate.bustudentportal.Splash_Activity$checkingnetwork.doInBackground(Splash_Activity.java:208)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:288)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err: at java.lang.Thread.run(Thread.java:818)
01-11 23:05:00.344 10320-10351/com.bu.innovate.bustudentportal I/art: Debugger is no longer active
01-11 23:05:00.644 10320-10320/com.bu.innovate.bustudentportal D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
01-11 23:06:03.744 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@12a519a2 time:27702733
我试图修复它，并使用两种方法来解决这个问题，但是有时甚至没有什么加上网络速度很慢时它也没有连接。如果你们帮我解决这个问题，那将非常有帮助。