Por: C. David

public class CalculadoraMain extends AppCompatActivity {
private Button btnN0;
private Button btnN1;
private Button btnN2;
private Button btnN3;
private Button btnN4;
private Button btnN5;
private Button btnN6;
private Button btnN7;
private Button btnN8;
private Button btnN9;
private Button btnSoma;
private Button btnSub;
private Button btnMulti;
private Button btnDivi;
private Button btnIgual;
private Button btnLimpa;
private TextView edConta;
private TextView edResu;

/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculadora_main);
edConta = (TextView) findViewById(R.id.edConta);
edResu = (TextView) findViewById(R.id.edResu);

btnN0 = (Button) findViewById(R.id.btnN0);
btnN1 = (Button) findViewById(R.id.btnN1);
btnN2 = (Button) findViewById(R.id.btnN2);
btnN3 = (Button) findViewById(R.id.btnN3);
btnN4 = (Button) findViewById(R.id.btnN4);
btnN5 = (Button) findViewById(R.id.btnN5);
btnN6 = (Button) findViewById(R.id.btnN6);
btnN7 = (Button) findViewById(R.id.btnN7);
btnN8 = (Button) findViewById(R.id.btnN8);
btnN9 = (Button) findViewById(R.id.btnN9);
btnSoma = (Button) findViewById(R.id.btnSoma);
btnSub = (Button) findViewById(R.id.btnSub);
btnMulti = (Button) findViewById(R.id.btnMulti);
btnDivi = (Button) findViewById(R.id.btnDivi);
btnIgual = (Button) findViewById(R.id.btnIgual);
btnLimpa = (Button) findViewById(R.id.btnLimpa);

btnN0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“0”);
}
});
btnN1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“1”);
}
});
btnN2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“2”);
}
});
btnN3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“3”);
}
});
btnN4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“4”);
}
});
btnN5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“5”);
}
});
btnN6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“6”);
}
});
btnN7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“7”);
}
});
btnN8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“8”);
}
});
btnN9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“9”);
}
});
btnSoma.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“ + ”);
}
});
btnSub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“ – “);
}
});
btnMulti.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“ x ”);
}
});
btnDivi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.append(“ / ”);
}
});
btnLimpa.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
edConta.setText(“”);
edResu.setText(“”);
}
});