Checkbox

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package com.example.checkbox;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CheckBox;
import android.widget.EditText;

public class MainActivity extends Activity {
 // Declaração de váriaveis
 EditText edSal, edRes;
 double num1;
 CheckBox taxa;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //Declaração do conteúdo
        edSal = (EditText) findViewById(R.id.et1);
        edRes = (EditText) findViewById(R.id.et2);        
        taxa = (CheckBox) findViewById(R.id.cb1);
        // Criando a ação do Checkbox
        taxa.setOnClickListener(new OnClickListener() {
          
       
         public void onClick(View v) {
                      
        if (((CheckBox) v).isChecked()) {
         
         num1 = Double.parseDouble(edSal.getText().toString());
          
         edRes.setText(String.valueOf(num1 * 0.1));
          
        }
        else{
         num1 = Double.parseDouble(edSal.getText().toString());
         
         edRes.setText(String.valueOf(num1));
        }
         
       
         }
       });
        
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}