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I am making my own project in Android Studio and I just got a message, shown in the below image, that I don't understand. Can you guys tell me what it is?

You should NEVER EVER EVER hold a static reference to any kind of Activity/Fragment/View. Ever.

Read the error message that is in your screenshot.

Remove the public static MainActivity ma. Any code that relies on that field is a major hack and will cause you a lot of problems further down the line. Guaranteed.

"uses unchecked or unsafe operations" warning, For example: javac Foo.java Note: Foo.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. Plus having clean build output is also nice :) While building an app, Gradle may produces some warnings telling you that some input files are using unchecked or unsafe operations or they are overriding a deprecated API.

Here is my code

public static MainActivity ma;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button btn=(Button)findViewById(R.id.button2);

    btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Intent inte = new Intent(MainActivity.this, BuatBiodata.class);
            startActivity(inte);
        }
    });


    ma = this;
    dbcenter = new DataHelper(this);
    RefreshList();
}

What causes javac to issue the “uses unchecked or unsafe , Note: Some input files use unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. This is fairly obvious from @shakalaca's answer, but if you have code old enough to get the deprecation warning, you may also have code old enough to use unchecked operations, e.g. a List without the parameterized type as in List<String>. This will get you an additional warning: Note: Some input files use unchecked or unsafe operations.

I've found the problem, the problem is on the getContext()

It said that getContext() may produce 'java.lang.NullPointerException.

MainActivity ma = (MainActivity) onCreateView().getContext();
    dbcenter = new DataHelper(this);
    RefreshList();

Recompile with -Xlint in Android studio, java uses unchecked or unsafe operations. Note: Recompile with -Xlint:​unchecked for details. If you use -Xlint:unchecked as an argument, you will get more  warning - uses unchecked or unsafe operations recompile with for details android studio Ignore several warnings in Android lint (3)

How to find out which methods cause warnings that use , but when building for Android via Android Studio I get the compile error below. /BugsnagReactNative.java: uses unchecked or unsafe o RequestQueue.java uses unchecked or unsafe operations #168. j-t-h opened this issue Apr 17, 2018 · 1 comment. In the latest Android Studio/Gradle I am getting this Java compiler issue/warning in the RequestQueue.java.

BugsnagReactNative.java uses unchecked or unsafe operations , In the latest Android Studio/Gradle I am getting this Java compiler issue/warning in the RequestQueue.java. uses unchecked or unsafe  Estou a desenvolver uma aplicação no Android Studio com Firebase que esta apresentando o seguinte erro. uses unchecked or unsafe operations C:\Users\Computador\Desktop\Minhapap\app\src\main\java\com\example\gonca\minhapap\Profile.java: uses unchecked or unsafe operations.

RequestQueue.java uses unchecked or unsafe operations · Issue , java uses unchecked or unsafe operations."? I have an error that i can't seem to make sence of. maybe one of you can make sence of it for me :-  Dismiss Join GitHub today. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Comments
  • Can you post your code and errors you're getting here?
  • Can you add more details on what you want to archive? Why do you need to have the MainActivity as a static filed, you can use getActivity().
  • Then, I have to change it with what?
  • That's a completely other question. It all depends on what you're trying to do.
  • Is this an answer to your question? If so, combine it with your other answer. If this is not an answer to your question, then you should delete it and just keep your other answer.
  • Check out this post on Meta Stack Exchange to see when you should post multiple answers to one question.