Stian Instebo Stian Instebo - 4 months ago 17
JSON Question

aSync Task can't be executed twice

I'm working on app which needs to upload a file to server. But to upload the files it needs to login (working) then get the url (working) then uploading (Force Close)

The logcat:

10-13 14:10:27.494: E/AndroidRuntime(26578): FATAL EXCEPTION: main
10-13 14:10:27.494: E/AndroidRuntime(26578): java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:578)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.os.AsyncTask.execute(AsyncTask.java:534)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.spxc.bayfiles.FilesActivity.onOptionsItemSelected(FilesActivity.java:294)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.actionbarsherlock.app.SherlockActivity.onMenuItemSelected(SherlockActivity.java:208)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.actionbarsherlock.ActionBarSherlock.callbackOptionsItemSelected(ActionBarSherlock.java:603)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.actionbarsherlock.internal.ActionBarSherlockNative.dispatchOptionsItemSelected(ActionBarSherlockNative.java:93)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.actionbarsherlock.app.SherlockActivity.onOptionsItemSelected(SherlockActivity.java:159)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.app.Activity.onMenuItemSelected(Activity.java:2566)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:986)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:547)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:115)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.view.View.performClick(View.java:4240)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.view.View$PerformClick.run(View.java:17721)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.os.Handler.handleCallback(Handler.java:730)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.os.Handler.dispatchMessage(Handler.java:92)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.os.Looper.loop(Looper.java:137)
10-13 14:10:27.494: E/AndroidRuntime(26578): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-13 14:10:27.494: E/AndroidRuntime(26578): at java.lang.reflect.Method.invokeNative(Native Method)
10-13 14:10:27.494: E/AndroidRuntime(26578): at java.lang.reflect.Method.invoke(Method.java:525)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-13 14:10:27.494: E/AndroidRuntime(26578): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-13 14:10:27.494: E/AndroidRuntime(26578): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:112)
10-13 14:10:27.494: E/AndroidRuntime(26578): at dalvik.system.NativeStart.main(Native Method)


My code: (handleJsonObject):

private void handleJsonObject(JSONObject object) {

try {
sUpload = object.getString("uploadUrl");
HttpClient httpclient = new DefaultHttpClient();

//post request to send the video

File sdCardRoot = Environment.getExternalStorageDirectory();
File myDir = new File(sdCardRoot, "Download");

HttpPost httppost = new HttpPost(sUpload);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy( policy);
FileBody video_file1 = new FileBody(new File(myDir + "/test.txt"));
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("file=", video_file1);
httppost.setEntity(reqEntity);

// DEBUG
System.out.println( "executing request " + httppost.getRequestLine( ) );
HttpResponse response = null;
try {
response = httpclient.execute( httppost );
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpEntity resEntity = response.getEntity( );

// DEBUG
System.out.println( response.getStatusLine( ) );
if (resEntity != null) {
try {
System.out.println( EntityUtils.toString( resEntity ) );
} catch (org.apache.http.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} // end if
if (resEntity != null) {
try {
resEntity.consumeContent( );
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} // end if

httpclient.getConnectionManager( ).shutdown( );


} catch (JSONException e) {
Log.e("log_tag", "Error parsing data: " + e.toString());
Crouton.makeText(this, "Something went wrong!", Style.ALERT).show();
}
}


The code (aSync) Which calls the post code (handleJsonObject):

asyncTask.setJsonListener(new JsonListener() {
public void onObjectReturn(JSONObject object) {
handleJsonObject(object);
}
});
asyncTask.execute("http://api.bayfiles.net/v1/file/uploadUrl?session=" + sessionId);


I can't figure out why the code won't work?
Any help is much appreciated!

Answer

As the exception itself explains, you cannot execute an AsyncTask more than once, unless you create a new instance of it and call .execute.

For example:

async = new AsyncTask();
async.execute();

*in order to execute more than once, you need to re-create the instance (using new) the number of times you want to execute it.

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