PROYECTO FINAL

CÓDIGO PARA HACER UNA PANTALLA QUE APAREZCA UNOS SEGUNDOS

package com.example.splash_screen;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Window;
import android.view.WindowManager;

     public class SplashScreen extends Activity {

 private boolean backbtnPress;
 private static final int SPLASH_DURATION = 3000; // 3 segundos
 private Handler myHandler;

 @Override
protected void onCreate(Bundle savedInstanceState){
 requestWindowFeature(Window.FEATURE_NO_TITLE);
 getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_splash_screen);

myHandler = new Handler();

myHandler.postDelayed(new Runnable() {

 @Override
 public void run() {
 finish();

 if(!backbtnPress)
 {
 Intent intent = new Intent(SplashScreen.this,MainActivity.class);
 SplashScreen.this.startActivity(intent);
 }
 }
    }, SPLASH_DURATION);
}

@Override
    public void onBackPressed() {
backbtnPress = true;
super.onBackPressed();
}
}

CODIGO PARA DAR UN FONDO A LA PANTALLA DE LA APLICACION
android:background"@drawable/fondo2"
                                                                                
Depende de el nombre que se la ponga a la imgen que se quiere de fondo                        

CÓDIGO PARA DAR LA ORDEN DE QUE SE REALICEN LAS OPERACIONES MATEMÁTICAS EN EL PROGRAMA

package com.example.calculator;

import com.example.calculator.R;

import android.os.Bundle;

import android.app.Activity;                                                                             

import android.view.Menu;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.CheckBox;

public class MainActivity extends Activity {

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

            }

            @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;

            }

           

             public void Resultado(View view) {

                    EditText et1=(EditText)findViewById(R.id.et1);

                    EditText et2=(EditText)findViewById(R.id.et2);

                    EditText et3=(EditText)findViewById(R.id.et3);

                    CheckBox checkBox1=(CheckBox)findViewById(R.id.checkBox1);

                    CheckBox checkBox2=(CheckBox)findViewById(R.id.checkBox2);       

                    CheckBox checkBox3=(CheckBox)findViewById(R.id.checkBox3); 

                    CheckBox checkBox4=(CheckBox)findViewById(R.id.checkBox4); 

                    CheckBox checkBox5=(CheckBox)findViewById(R.id.checkBox5); 

                         

                    int nro1=Integer.parseInt(et1.getText().toString());

                    int nro2=Integer.parseInt(et2.getText().toString());      

                   

                    if (checkBox1.isChecked()==true) {

                        int suma=nro1+nro2;

                        String resu=String.valueOf(suma);

                        et3.setText(resu);

                    }

                    else

                        if (checkBox2.isChecked()==true) {

                        int resta=nro1-nro2;

                        String resu=String.valueOf(resta);

                        et3.setText(resu);               

                        }

                    else

                         if (checkBox3.isChecked()==true) {

                                    int mul=nro1*nro2;

                                    String resu=String.valueOf(mul);

                                    et3.setText(resu);               

                                    }         

                            else

                         if (checkBox4.isChecked()==true) {

                                    int div=nro1/nro2;

                                    String resu=String.valueOf(div);

                                    et3.setText(resu);               

                                    }         

                        else

                         if (checkBox5.isChecked()==true) {

                                    int ele=nro1*nro1;

                                    String resu=String.valueOf(ele);

                                    et3.setText(resu);

}  

                                    }         

            }