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- package com.rubensilva.formulasfisicas;
- import android.app.Activity;
- import android.content.Context;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.text.TextUtils;
- import android.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- import android.widget.Toast;
- public class EnergiaTransferida extends Activity implements View.OnClickListener {
- private EditText txtEnergia;
- private EditText txtDdp;
- private EditText txtCorrenteEletrica;
- private EditText txtTempo;
- private Button btnDeterminar;
- private TextView lblResultado;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_energia_transferida);
- txtEnergia = (EditText)findViewById(R.id.txtEnergia);
- txtDdp = (EditText)findViewById(R.id.txtDdp);
- txtCorrenteEletrica = (EditText)findViewById(R.id.txtCorrenteEletrica);
- txtTempo = (EditText)findViewById(R.id.txtTempo);
- btnDeterminar = (Button)findViewById(R.id.btnDeterminar);
- btnDeterminar.setOnClickListener(this);
- lblResultado = (TextView) findViewById(R.id.lblResultado);
- }
- public void onClick(View v){
- if (txtEnergia.getText().toString().trim().length() == 0 ){
- lblResultado.setText("Inválido");
- }
- if (txtEnergia.getText().toString().trim() == "0"){
- float u = Float.parseFloat(txtDdp.getText().toString());
- float i = Float.parseFloat(txtCorrenteEletrica.getText().toString());
- float tempo = Float.parseFloat(txtTempo.getText().toString());
- float energia = (u * i * tempo);
- String strDouble = String.format("%.2f", energia);
- lblResultado.setText("E = " + strDouble + " J");
- }
- if (txtDdp.getText().toString().trim().length() == 0 ){
- float e = Float.parseFloat(txtEnergia.getText().toString());
- float i = Float.parseFloat(txtCorrenteEletrica.getText().toString());
- float tempo = Float.parseFloat(txtTempo.getText().toString());
- float ddp = (e / (i * tempo));
- String strDouble = String.format("%.2f", ddp);
- lblResultado.setText("U = " + strDouble + " V");
- }
- if (txtCorrenteEletrica.getText().toString().trim().length() == 0 ){
- float e = Float.parseFloat(txtEnergia.getText().toString());
- float u = Float.parseFloat(txtDdp.getText().toString());
- float tempo = Float.parseFloat(txtTempo.getText().toString());
- float corrente = (e / (u * tempo));
- String strDouble = String.format("%.2f", corrente);
- lblResultado.setText("I = " + strDouble + " A");
- }
- if (txtTempo.getText().toString().trim().length() == 0 ){
- float e = Float.parseFloat(txtEnergia.getText().toString());
- float u = Float.parseFloat(txtDdp.getText().toString());
- float i = Float.parseFloat(txtCorrenteEletrica.getText().toString());
- float segundos = (e / (u * i));
- String strDouble = String.format("%.2f", segundos);
- lblResultado.setText("Tempo = " + strDouble + " s");
- }
- else {
- lblResultado.setText("Campos Inválidos");
- }
- }
- }
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