CODEWITHSUNDEEP
javaandroidonclicklistener
Mario
Mario

Reputation: 95

OnClickListener can't be found

I'm learning android and I'm currently doing a calculator. I've already done the xml part, where I put the buttons And I'm trying to finish the Java file, which is the code that makes the calculator work

BUT in the Java file I've got this error: Error:(22, 64) error: cannot find symbol class OnClickListener

and I don't know what to do :c I'm still learning I've seen that I should put 

    public class MainActivity extends ActionBarActivity implements View.OnClickListener {

But I don't understand what's that and I don't know if that will bug the calculator.

That's the Java file (MainActivity)

package com.example.glow.pruebas;

import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity implements OnClickListener {

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

        Button n0 = (Button) findViewById(R.id.B0);
        n0.setOnClickListener(this);
        Button n1 = (Button) findViewById(R.id.B1);
        n1.setOnClickListener(this);
        Button n2 = (Button) findViewById(R.id.B2);
        n2.setOnClickListener(this);
        Button n3 = (Button) findViewById(R.id.B3);
        n3.setOnClickListener(this);
        Button n4 = (Button) findViewById(R.id.B4);
        n4.setOnClickListener(this);
        Button n5 = (Button) findViewById(R.id.B5);
        n5.setOnClickListener(this);
        Button n6 = (Button) findViewById(R.id.B6);
        n6.setOnClickListener(this);
        Button n7 = (Button) findViewById(R.id.B7);
        n7.setOnClickListener(this);
        Button n8 = (Button) findViewById(R.id.B8);
        n8.setOnClickListener(this);
        Button n9 = (Button) findViewById(R.id.B9);
        n9.setOnClickListener(this);

        Button coma = (Button) findViewById(R.id.Bcoma);
        coma.setOnClickListener(this);
        Button igual = (Button) findViewById(R.id.Bigual);
        igual.setOnClickListener(this);

        Button suma = (Button) findViewById(R.id.B6sumar);
        suma.setOnClickListener(this);
        Button resta = (Button) findViewById(R.id.B5restar);
        resta.setOnClickListener(this);
        Button mul = (Button) findViewById(R.id.Bmult);
        mul.setOnClickListener(this);
        Button division = (Button) findViewById(R.id.Bdividir);
        division.setOnClickListener(this);
        Button raiz = (Button) findViewById(R.id.raiz);
        raiz.setOnClickListener(this);
        Button elevado = (Button) findViewById(R.id.BElevado);
        elevado.setOnClickListener(this);

        Button DEL = (Button) findViewById(R.id.BDEL);
        DEL.setOnClickListener(this);
        Button AC = (Button) findViewById(R.id.BAC);
        AC.setOnClickListener(this);

        Button sin = (Button) findViewById(R.id.Bsin);
        sin.setOnClickListener(this);
        Button cos = (Button) findViewById(R.id.Bcos);
        cos.setOnClickListener(this);
        Button tan = (Button) findViewById(R.id.Btan);
        tan.setOnClickListener(this);

        Button secreto = (Button) findViewById(R.id.Bsecreto);
        secreto.setOnClickListener(this);

    }
    @Override
    public void onClick(View v) {
        TextView pantalla = (TextView) findViewById(R.id.texto);
        int seleccion = v.getId();

        try {
            switch (seleccion) {
                case R.id.B0:
                    pantalla.setText("0");
                    break;
                case R.id.B1:
                    pantalla.setText("1");
                    break;
                case R.id.B2:
                    pantalla.setText("2");
                    break;
                case R.id.B3:
                    pantalla.setText("3");
                    break;
                case R.id.B4:
                    pantalla.setText("4");
                    break;
                case R.id.B5:
                    pantalla.setText("5");
                    break;
                case R.id.B6:
                    pantalla.setText("6");
                    break;
                case R.id.B7:
                    pantalla.setText("7");
                    break;
                case R.id.B8:
                    pantalla.setText("8");
                    break;
                case R.id.B9:
                    pantalla.setText("9");
                    break;

                case R.id.Bcoma:
                    pantalla.setText(",");
                    break;

                case R.id.Bmult:
                    break;
                case R.id.B5restar:
                    break;
                case R.id.B6sumar:
                    break;
                case R.id.Bdividir:
                    break;
                case R.id.BAC:
                    break;

                case R.id.Bsin:
                    break;
                case R.id.Bcos:
                    break;
                case R.id.Btan:
                    break;
            }

        }catch(Exception e){
            pantalla.setText("error");
        };

    }
}

Upvotes: 0

Views: 953

Answers (4)

Mrugesh
Mrugesh

Reputation: 4517

implement View.onClickListener instead of OnClickListener

Upvotes: 0

Asama
Asama

Reputation: 385

As you said you have to add

public class MainActivity extends ActionBarActivity implements View.OnClickListener {

So your problem is here: public class MainActivity extends ActionBarActivity implements OnClickListener.

Change that line to public class MainActivity extends ActionBarActivity implements View.OnClickListener

You are missing the View.OnClickListener and using just implements OnClickListener Changing that will solve your issue ;)

Upvotes: 0

Sagar Chavada
Sagar Chavada

Reputation: 5269

your mistake is that you implemented DialogInterface.onClickListener, it not work as a simple click listener, but in your case you have to implement View.onClickListener

your DialogInterface.onClickListener only work on dialog, and its not a VIEW and you are working on view object thats why.

Upvotes: 0

Keshav
Keshav

Reputation: 577

A silly mistake.

Change your implement from OnClickListener to View.OnClickListener.

Since you said you don't know what it does:

http://developer.android.com/reference/android/view/View.OnClickListener.html

You are basically trying to implement an Interface, so that you can access its method onClick(View v) where you are passing the View in the argument.

Upvotes: 1

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