• Register
0 votes
120 views

Problem :

I am getting bellow error while learning android and trying to make a semi-useful app.

java.lang.illegalstateexception: could not execute method for android:onclick

6 5 3
6,930 points

Please log in or register to answer this question.

1 Answer

0 votes

Solution:

This bellow line is throwing an NPE, producing an IllegalStateException in the exception chain:

int stopPortRange = Integer.parseInt(stopPort.getText().toString());

as you don't initialize stopPort (or startPort) in your onCreate method. You should have something like:

stopPort = (EditText) findViewById(R.id.stop_port_field);

The statement

EditText stopPort;

simply declares the variable which is null by default. Only instances that have been instantiated can have their methods invoked.

Further Readings:

https://github.com/printdotio/printio-android-sdk/issues/162

9 7 4
38,600 points

Related questions

0 votes
1 answer 76 views
76 views
Problem : While executing Android code getting below error java.lang.illegalstateexception could not execute method of the activity
asked Oct 23, 2019 peterlaw 6.9k points
0 votes
1 answer 3 views
3 views
Any suggestions?
asked Jan 4 TeamScript 9.5k points
0 votes
1 answer 41 views
41 views
Problem : Now a days I am learning Android Programming. I am facing below error message while trying to implement the logout functionality for the Google Sign-In for the Android: “Caused by: java.lang.IllegalStateException: GoogleApiClient is not ... .getInstance().getClient(); Auth.GoogleSignInApi.signOut(myGoogleApiClient); } I am struggling to find solution on it since yesterday.
asked Feb 27, 2020 mphil 2.3k points
1 vote
1 answer 27 views
27 views
Problem: I kept on getting this error when building for Android (shadow demo): Building DEX Failed! G:\Unity\JavaPluginSample\Temp/StagingArea> java -Xmx1024M -Djava.ext.dirs="G:/AndroidSDK/android-sdk_r09-windows\platform-tools/lib/" -jar "G:/AndroidSDK/android- ... initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. How to solve this?
asked Mar 27, 2020 LizzyM 6.1k points
1 vote
1 answer 23 views
23 views
Problem: I am getting this error when I tried to build shadow demo for android: Building DEX Failed! G:\Unity\JavaPluginSample\Temp/StagingArea> java -Xmx1024M -Djava.ext.dirs="G:/AndroidSDK/android-sdk_r09-windows\platform-tools/lib/" -jar "G:/AndroidSDK/android- ... reserve enough space for object heap Could not create the Java virtual machine. Can anybody help to fix or explain me this error
asked Mar 24, 2020 LizzyM 6.1k points
0 votes
1 answer 664 views
664 views
Problem : I am trying to learn Android programming also I am trying to develop a very basic weather app. My code works perfectly if I try to enter any valid city name. But I want to use the toast and it shows me the error and also to the ... .nextCleanInternal(JSONTokener.java:116) at org.json.JSONTokener.nextValue(JSONTokener.java:94) at org.json.JSONObject. How can I fix the above error?
asked Feb 14, 2020 mphil 2.3k points
0 votes
1 answer 79 views
79 views
Problem : Facing following error related to class path error:could not determine the class-path for interface com.android.builder.model.androidproject.
asked Nov 12, 2019 peterlaw 6.9k points
0 votes
1 answer 30 views
30 views
Why i am seeing this error can someone give me some explanation "Could not reserve enough space for object heap"” and how to resolve this issue.
asked Sep 14, 2020 Daniel Anderson 4k points
0 votes
1 answer 131 views
131 views
Cannot create controller in thread that did not call Looper.prepare () What does the following exception mean? How can I fix it? Here is the code: Toast toast = Toast.makeText (mContext, "Something", Toast.LENGTH_SHORT); This is the exception: Java.lang.RuntimeException: Cannot ... :121)      on Android.widget.Toast. <init> (Toast.Java:68)      on Android.widget.Toast.makeText (Toast.Java:231)
asked Aug 17, 2020 game 4.6k points