I am trying to use the help example of ProgressDialog.show(Context, message, message, boolean).
Target Android 2.1 level 7 and using Eclipse.
The code is refused with message that new View.onClickListener is the first parameter.
I cant find any reference or example of this form in the Android developer help or by googling. Can anyone help please?
Ron
It's hard to tell without seeing your code, but it sounds to me that you might be trying to use "this" as a reference to the context as the first parameter, and that you're inside the onClickListener when you're doing it. While in there, "this" doesn't refer to your Activity, but to your OnClickListener. Try saving a reference to your context in the activity's onCreate method and using that as the parameter for the ProgressDialog.show call.
Related
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When I try to create a new class in the library of flutter, inside the class the constructor shows error
The problem is that you have your parameters as optionally named, which means the caller can decide not to pass q or a, but you also marked them as non-nullable. Add the required keyword before your parameters to make sure they're passed in and are non-null, or add a default.
Also, in the future:
Please copy-paste your code instead of using an image. This lets us quickly copy-paste it into our IDEs and find any errors.
Please post the error you're getting. Errors are your friends, they tell you what's wrong, and they'll help us figure out how to help you.
So, what I'd like to achieve is:
I have a custom class which is basically a HttpRequest, I create the object with url, parameters, etc. And then I have to call execute() to execute it.
I was wondering, is there a way - by annotations, or whatever - to make Android Studio remind me to call this method?
I remember the was something similar with the android Toast, in the IDE a message like 'Did you forget to call show?' was shown if, in fact, I forgot to call show() after creating the Toast.
Thanks much to anyone who will help :)
You could try to create
Create a custom IntelliJ inspection
A custom LINT rule, if you want to check it on your build server and not on your local machine.
Here is the link of the Minesweeper project on codeproject.com.
I just wanted to ask one thing here. I completely understood the logic and algorithm this guy used, but when he called the showMineField() method inside startNewGame() method , he called it after createMineField(). I am really confused! Shouldn't the layout be set before setting up mines and handling the user click events? But the code seems to work fine. If I just call showMineField() inside startNewGame() , it gives me NullPointerException.
This is because you cannot show a mine field before creating all the objects.
It is like trying to run without legs. If you call showMineField() that is using objects that have not been initialized. Thats why you are recieving a NUllPointerException. Nullpointer is throws when a method is trying to be call on an object that has not been created yet. createminefield() initialzes everything so that nullpointer is not thrown
I'm attempting to create an Activity and unfortunately every time I want to grab one of my XML components it gives me a RunTimeException (NullPointer).
Anytime I use code such as:
TextView tv = (TextView) findViewById(R.id.myView); //I get the exception
The same happens for any components I attempt to find with that method. I can't quite figure out why. I know it isn't due to the Activity not being in the Manifest because it's the only Activity in the test app I made. (The one set up by default).
Oddly I can still use setContentView(R.id.myView). It just doesn't seem to want to find anything when using the findViewById method.
Info that might be of use:
I am currently using NetBeans as my IDE.
I have done multiple 'clean and builds' as was suggested in another question. Android -findViewById question
Has anyone run into this issue before? If so, what was the solution?
If need be, I can provide sample code of when this is happening.
Don't pass in a view ID to setContentView, pass in a layout resource ID:
setContentView(R.layout.layout_name);
If you still have problems, post your layout file.
It is very sure that you R.java is not properly generated.
Delete R.Java in netbeans IDE and Re-build the project.
Hope it resolves your query.
I need help with using an if statement in java, here is my code :
if(ans==1)
{
txtans.setText("This is a Prime Number");
}
else
{
txtans.setText("This is NOT a Prime Number");
}
if I remove the setText methods in both statements my program works, but when I leave them there and the program finds ans, then it quits, I'm wondering whats wrong with the statements? or is it not possible to use the setText method within if statements..if so how do I overcome this? What I want to do is print a string to the TextView layout when the ans = 1, any suggestions?
Yes, you can run txtans.setText() in an if statement just as well as you could run it if it wasn't in an if statement. You likely just don't have txtans initialised properly.
A quick google search brought up this as a way to print text to a textview.
Check your code, this erros usually comes when use findViewById() method in a wrong view.
In the activity you use like this findViewById(), maybe you need to call yourView.findViewById();
(If you post your class we can help you with more detailed answear.)
Also note that it is not allowed to call methods from Views from another Thread which created them. But a LogCat output including the Error will enlight us for shure :)
txtans might be NULL and you are trying to access a member of a NULL object.