import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1 = (Button) findViewById(R.id.btn1);
Button btn2 = (Button) findViewById(R.id.btn2);
Button btn3 = (Button) findViewById(R.id.btn3);
Button btn4 = (Button) findViewById(R.id.btn4);
Button btn5 = (Button) findViewById(R.id.btn5);
Button btn6 = (Button) findViewById(R.id.btn6);
Button btn7 = (Button) findViewById(R.id.btn7);
Button btn8 = (Button) findViewById(R.id.btn8);
Button btn9 = (Button) findViewById(R.id.btn9);
Button btn0 = (Button) findViewById(R.id.btn0);
Button plus = (Button) findViewById(R.id.plus);
Button minus = (Button) findViewById(R.id.minus);
Button multiply = (Button) findViewById(R.id.multiply);
Button divide = (Button) findViewById(R.id.divide);
Button equals = (Button) findViewById(R.id.equals);
Button prime = (Button) findViewById(R.id.prime);
btn0.setOnClickListener(this);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
btn5.setOnClickListener(this);
btn6.setOnClickListener(this);
btn7.setOnClickListener(this);
btn8.setOnClickListener(this);
btn9.setOnClickListener(this);
plus.setOnClickListener(this);
minus.setOnClickListener(this);
multiply.setOnClickListener(this);
divide.setOnClickListener(this);
equals.setOnClickListener(this);
prime.setOnClickListener(this);
}
@Override
public void onClick(View view) {
String S;
TextView content = (TextView) findViewById(R.id.content);
String val;
switch (view.getId()) {
case R.id.btn0:
content.append("0");
break;
case R.id.btn1:
content.append("1");
break;
case R.id.btn2:
content.append("2");
break;
case R.id.btn3:
content.append("3");
break;
case R.id.btn4:
content.append("4");
break;
case R.id.btn5:
content.append("5");
break;
case R.id.btn6:
content.append("6");
break;
case R.id.btn7:
content.append("7");
break;
case R.id.btn8:
content.append("8");
break;
case R.id.btn9:
content.append("9");
break;
case R.id.plus:
if(Sconunt(content.toString())){
S=content.toString().substring(0,content.toString().length()-1)+"+";
content.setText(S);
break;
}
content.append("+");
break;
case R.id.minus:
if(Sconunt(content.toString())){
S=content.toString().substring(0,content.toString().length()-1)+"-";
content.setText(S);
break;
}
content.append("-");
break;
case R.id.multiply:
if(Sconunt(content.toString())){
S=content.toString().substring(0,content.toString().length()-1)+"*";
content.setText(S);
break;
}
content.append("*");
break;
case R.id.divide:
if(Sconunt(content.toString())){
S=content.toString().substring(0,content.toString().length()-1)+"/";
content.setText(S);
break;
}
content.append("/");
break;
case R.id.equals:
//countview=(String) hap(content.toString());
break;
case R.id.prime:
content.append(".");
}
}
boolean Sconunt(String BSstr){
if(BSstr.toString().endsWith("+")){return false;}
if(BSstr.toString().endsWith("-")){return false;}
if(BSstr.toString().endsWith("*")){return false;}
if(BSstr.toString().endsWith("/")){return false;}
return true;
}
}
content.toString().substring(0,content.toString().length()-1)+"+";
content.setText(S);
이부분을 어떻게 해야할까요 조언좀 해주세요 사칙연산이 눌러지게되면 앞에 사칙연산이 있으면 바뀌게하려고 합니다 이렇게 하면 이상하게 나오는데 어떻게해야할까요 ??