CODIGO DE CALCULADORA DE 8 DIGITOS EN ANDROID STUDIO

CODIGO DE CALCULADORA  DE 8 DIGITOS EN ANDROID STUDIO

esto es mi primer proyecto en android studio se trata de una calculadora aunque basica espero les sirva como ejemplo .....

package com.example.calculadora;

import android.support.v7.app.ActionBarActivity;

import android.support.v4.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

public class MainActivity extends ActionBarActivity{

   @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {

            getSupportFragmentManager().beginTransaction()

                    .add(R.id.container, new PlaceholderFragment())

                    .commit();

        }

    }

   @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;

    }

   @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        switch (item.getItemId()) {

            case R.id.action_settings:

                return true;

        }

        return super.onOptionsItemSelected(item);

    }

    /**

     * A placeholder fragment containing a simple view.

     */

    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {

        }

       @Override

        public View onCreateView(LayoutInflater inflater, ViewGroup container,

                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.fragment_main, container, false);

            return rootView;

        }

    }

/**

    public void onClickSuma(View miVista){

        TextView temp;

        temp = (TextView)findViewById(R.id.num1);

        try{

            float a = Float.parseFloat(temp.getText().toString());

            temp = (TextView)findViewById(R.id.num2);

            float b = Float.parseFloat(temp.getText().toString());

            float c=a+b;

            TextView resultado = (TextView)findViewById(R.id.resultado);

            resultado.setText(" "+ c);

        }catch (Exception e){

        }

    }

 */

Double num1,num2,resul;

  String operador;

    public void onclickcero(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

               tv.setText(tv.getText() + "0");

    }

public void onclickuno(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "1");

}

    public void onclickdos(View miVista){

            TextView tv = (TextView) findViewById(R.id.numero) ;

            tv.setText(tv.getText() + "2");

        }

    public void onclicktres(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "3");

    }

    public void onclickcuatro(View miVista){

            TextView tv = (TextView) findViewById(R.id.numero) ;

            tv.setText(tv.getText() + "4");

        }

    public void onclickcinco(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "5");

    }

    public void onclickseis(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "6");

    }

    public void onclicksiete(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "7");

    }

    public void onclickocho(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText() + "8");

    }

    public void onclicknueve(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

        tv.setText(tv.getText()+"9" );

    }

    public void onclickpunto(View miVista){

        TextView tv = (TextView) findViewById(R.id.numero) ;

               tv.setText(tv.getText() + ".");

    }

    public void onclickdivision(View miView)

    {

        operador="/";

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        TextView tv = (TextView) findViewById(R.id.numero) ;

        num1 = Double.parseDouble(tv.getText().toString());

        tv1.setText(num1.toString()+" / ");

        tv.setText("");

    }

    public void onclickmultiplicacion(View miView)

    {

        operador="*";

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        TextView tv = (TextView) findViewById(R.id.numero) ;

        num1 = Double.parseDouble(tv.getText().toString());

        tv1.setText(num1.toString()+" * ");

        tv.setText("");

    }

    public void onclicksuma(View miView)

    {

        operador="+";

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        TextView tv = (TextView) findViewById(R.id.numero) ;

        num1 = Double.parseDouble(tv.getText().toString());

        tv1.setText(num1.toString()+" + ");

        tv.setText("");

    }

    public void onclickresta(View miView)

    {

        operador="-";

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        TextView tv = (TextView) findViewById(R.id.numero) ;

        num1 = Double.parseDouble(tv.getText().toString());

        tv1.setText(num1.toString()+" - ");

        tv.setText("");

    }

    public void onclickdelete(View miView)

    {

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        TextView tv = (TextView) findViewById(R.id.numero) ;

        num2=0.0;

        num1 =0.0;

        tv1.setText("");

        tv.setText("");

    }

    public void onclickigual(View miView)

    {

        TextView tv = (TextView) findViewById(R.id.numero) ;

        TextView tv1 = (TextView) findViewById(R.id.textonum) ;

        String a = tv1.getText().toString();

        num2 = Double.parseDouble(tv.getText().toString());

        if (operador.equals("+")){

            resul = num1 + num2;

        }

       else if (operador.equals("-")){

            resul = num1 - num2;

        }

        else if (operador.equals("*")){

            resul = num1 * num2;

        }

        else if (operador.equals("/")){

            resul = num1 / num2;

        }

        tv1.setText(a+ num2);

        tv.setText(resul.toString());

    }

    }