How can i get my buttons working for Android Studio?

Question

I have an Activity which has two buttons on it. The first button adds the user data to a database and the second takes us to a different activity. The buttons in my main activity are working but not in this activity. The code seems to be correct.

Activity:

public class addData extends AppCompatActivity {
    EditText addName, addAge, addWeight;
    Button addDatatoDB, goToCalcIntake;
    personInfo personInfodDB;
    final int ltrPerKg = 30;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_data);

        addName = (EditText) findViewById(R.id.addName);
        addWeight = (EditText) findViewById(R.id.addWeight);
        addAge = (EditText) findViewById(R.id.addAge);

        addDatatoDB = (Button) findViewById(R.id.addDatatoDatabase);
        goToCalcIntake = (Button) findViewById(R.id.goTo);
        personInfodDB = new personInfo(getApplicationContext());



       addDatatoDB.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               String name = addName.getText().toString().trim();
               int weight = Integer.valueOf(addWeight.getText().toString().trim());
               int age = Integer.valueOf(addAge.getText().toString().trim());
               int intake = weight/ltrPerKg;
               personInfodDB.addInfo(name,weight,age,intake);
           }
       });

        goToCalcIntake.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                setContentView(R.layout.show_intake);
            }
        });;
    }

}

<Button
    android:id="@+id/goTo"
    android:layout_width="168dp"
    android:layout_height="77dp"
    android:layout_alignParentEnd="true"
    android:layout_alignParentBottom="true"
    android:layout_marginEnd="16dp"
    android:layout_marginBottom="22dp"
    android:text="Calculate your intake here" />

Answer 1

Try this.

goToCalcIntake.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
               Intent i = new Intent(MainActivity.this, show_intake.class);
                    startActivity(i);
            }
        });;

I assume that your next activity is called "show_intake" I cut the code my own working project.

Answer 2

make sure you declare and initialize.

declare

Button goToCalcIntake;

initialize

goToCalcIntake= findViewById(R.id.btnaddStudent);