I want to call a new AsyncTask from onPostExecute of the currently finished AsyncTask.
protected void onPostExecute(Integer feed) {
dialog1.dismiss();
super.onPostExecute(feed);
new SendsequenceofRequest().execute();
}
But I'm receiving following exception:
android.os.NetworkOnMainThreadException
My logcat output is:
09-30 16:08:19.517: W/System.err(3706): android.os.NetworkOnMainThreadException
09-30 16:08:19.517: W/System.err(3706): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
09-30 16:08:19.517: W/System.err(3706): at dalvik.system.BlockGuard$WrappedNetworkSystem.read(BlockGuard.java:279)
09-30 16:08:19.517: W/System.err(3706): at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:448)
09-30 16:08:19.517: W/System.err(3706): at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:75)
09-30 16:08:19.517: W/System.err(3706): at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
09-30 16:08:19.517: W/System.err(3706): at org.apache.http.impl.io.SocketInputBuffer.isStale(SocketInputBuffer.java:132)
09-30 16:08:19.517: W/System.err(3706): at org.apache.http.impl.AbstractHttpClientConnection.isStale(AbstractHttpClientConnection.java:205)
09-30 16:08:19.517: W/System.err(3706): at org.apache.http.impl.conn.AbstractClientConnAdapter.isStale(AbstractClientConnAdapter.java:185)
09-30 16:08:19.577: W/System.err(3706): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:336)
09-30 16:08:19.577: W/System.err(3706): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-30 16:08:19.577: W/System.err(3706): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-30 16:08:19.597: W/System.err(3706): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-30 16:08:19.597: W/System.err(3706): at com.dm.ekot.reqres.SimpleHttpClient.sendresponseSequReqRes(SimpleHttpClient.java:715)
09-30 16:08:19.607: W/System.err(3706): at com.dm.ekot.MainScreen$SendsequenceofRequest$1$1.run(MainScreen.java:1020)
09-30 16:08:19.620: W/System.err(3706): at android.os.Handler.handleCallback(Handler.java:587)
09-30 16:08:19.620: W/System.err(3706): at android.os.Handler.dispatchMessage(Handler.java:92)
09-30 16:08:19.620: W/System.err(3706): at android.os.Looper.loop(Looper.java:132)
09-30 16:08:19.620: W/System.err(3706): at android.app.ActivityThread.main(ActivityThread.java:4025)
09-30 16:08:19.627: W/System.err(3706): at java.lang.reflect.Method.invokeNative(Native Method)
09-30 16:08:19.627: W/System.err(3706): at java.lang.reflect.Method.invoke(Method.java:491)
09-30 16:08:19.627: W/System.err(3706): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
09-30 16:08:19.627: W/System.err(3706): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
09-30 16:08:19.642: W/System.err(3706): at dalvik.system.NativeStart.main(Native Method)
In my SendsequenceofRequest AsyncTask I do start another thread in doInBackground() method.
class SendsequenceofRequest extends AsyncTask<String, Void, Integer> {
// private ProgressDialog dialog1;
protected void onPreExecute() {
// dialog1 = ProgressDialog.show(MainScreen.this, "", "Loading...");
}
protected void onPostExecute(Integer feed) {
// dialog1.dismiss();
super.onPostExecute(feed);
}
@Override
protected Integer doInBackground(String... arg0) {
String str_stater_menu = "Starters";
String response_starter = "";
try {
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
while (isThreadPaused1) {
try {
Thread.sleep(3000);
mHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
final String response_req_sequence = SimpleHttpClient.sendresponseSequReqRes(response_send_order);
System.out.println(" i ma in thread");
if(response_req_sequence != null)
{
onPause();
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Your Order will be delivered in"+response_req_sequence, 10000).show();
}
});
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
}
}).start();
//response_starter = SimpleHttpClient.sendFirstStarter(str_stater_menu);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println("i am getting response for starter"+response_starter);
// str_reponse_request_tableid_ip = SimpleHttpClient.sendIpTabletId(url , str_ip);
/**
*
*/
// res = response_starter.toString();
System.out.println("response TEST: "+res);
// Object obj = response_starter.toString();
System.out.println("after object creation ");
// getJsonStringForStarter(response_starter);
System.out.println("response :"+res);
/** Inside the new thread we cannot update the main thread
So updating the main thread outside the new thread */
try {
}catch (Exception e) {
e.printStackTrace();
// e.printStackTrace();
}
return null;
}
}
When i go through several link i couldn't found any help as my issue. So please nay body help me to take me out of this issue. Thanks in advance to all.
I would suggest the use of publishProgress to publish the current progress and override onProgressUpdate which is executed on the main thread. With that, you won't have to use handlers and Threads in the AsyncTask at all.
Notice that the first line has changed from extends AsyncTask<String, Void, Integer> to extends AsyncTask<String, String, Integer>. The middle parameter determines the object type of the Update Parameter. If you need to send complex data to the update method, change it to a class containing all information necessary.
class SendsequenceofRequest extends AsyncTask<String, String, Integer> {
@Override
protected Integer doInBackground(String... arg0) {
try {
// This will run indefinitely, unless stopped by break. So make sure you have an exit condition, see below
String response_req_sequence = null;
do {
response_req_sequence = SimpleHttpClient.sendresponseSequReqRes(response_send_order);
if(response_req_sequence != null) {
// Instead of calling runOnUiThread, call progress update
publishProgress(response_req_sequence);
}
// Wait before retry
Thread.sleep(3000);
// Keep in mind, that if the connection is successful, the string may be empty,
// so TextUtils.isEmpty(response_req_sequence); may be better exit condition as it checks if string is null or has size of 0
} while(response_req_sequence!=null);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
void onProgressUpdate(String... string) {
// This will always be executed in main thread
onPause();
Toast.makeText(getApplicationContext(), "Your Order will be delivered in"+response_req_sequence, 10000).show();
}
protected void onPostExecute(Integer feed) {
// Notify user the task has bene completed
Toast.makeText(getApplicationContext(), "Task completed.", 10000).show();
}
}