Thread: Checking if input value is in an array

Hi
So I'm trying to make a somewhat simple Android application.
A user enters a value in a numberbox.
The program checks if that number is in an array.
If it is, in a textbox it says "Yes" if it isn't, in the same text box it says "No"

public class MainActivity extends AppCompatActivity {
 
    private Integer enterDate; private Button btnCheck; private TextView resVal;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
 
        enterDate = (Integer) findViewById(R.id.enterDate);
        btnCheck = (Button) findViewById(R.id.btnCheck);
        resVal = (TextView) findViewById(R.id.resVal);
 
        btnCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
 
                Integer[] array = {1,3,5,7};
                Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
                boolean enterDate = set.contains(enterDate);
                if(enterDate) {
                    resVal.setText("Yes");
                }else {
                            resVal.setText("No");
                        }
                    }
            }
    }});

I'm getting three errors:

error: ')' expected
error: illegal start of type
error: reached end of file while parsing

They all point me to the last line of code

You are declared enterDate as integer, so just initialized it like this

int enterDate = 0

Below code is not needed.

enterDate = (Integer) findViewById(R.id.enterDate);

and by the way, this enterDate variable is actually the number that I want to get from input in the numberbox

Then you need to add an editText, and then assign the input to enterDate variable when button is clicked.

See the example below

public class MainActivity extends AppCompatActivity {
 
    private Button btnCheck;
    private TextView resVal;
    private EditText editText;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
 
        editText = (EditText) findViewById(R.id.editText);  // create an editText
 
        btnCheck = (Button) findViewById(R.id.btnCheck);
        resVal = (TextView) findViewById(R.id.resVal);
 
        btnCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
 
                Integer[] array = {1, 3, 5, 7};
                Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
 
                String enterDate = editText.getText().toString();    // get the input from editText, then assign to enterDate variable
                int value = Integer.parseInt(enterDate);
 
                boolean enterDate1 = set.contains(value);
                if (enterDate1) {
                    resVal.setText("Yes");
                } else {
                    resVal.setText("No");
                }
            }
 
        });
    }
}

Originally Posted by John Joe

Then you need to add an editText, and then assign the input to enterDate variable when button is clicked.

See the example below

public class MainActivity extends AppCompatActivity {
 
    private Button btnCheck;
    private TextView resVal;
    private EditText editText;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
 
        editText = (EditText) findViewById(R.id.editText);  // create an editText
 
        btnCheck = (Button) findViewById(R.id.btnCheck);
        resVal = (TextView) findViewById(R.id.resVal);
 
        btnCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
 
                Integer[] array = {1, 3, 5, 7};
                Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
 
                String enterDate = editText.getText().toString();    // get the input from editText, then assign to enterDate variable
                int value = Integer.parseInt(enterDate);
 
                boolean enterDate1 = set.contains(value);
                if (enterDate1) {
                    resVal.setText("Yes");
                } else {
                    resVal.setText("No");
                }
            }
 
        });
    }
}

This returns an error
error: cannot find symbol variable editText

I just changed the ID attribute in content and it worked.
I really appreciate your help.
Thanks a TON!

You''re welcome