<Android> 7. Make a Calculator application

Calculator Ver1.0

• 계산기 어플 구현(후위표기 알고리즘 이용)

• http://willbfine.tistory.com/158

• 괄호 계산가능. 소수점 출력가능. 소수점 미구현 

<메뉴 화면 전환>

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button=findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(getApplicationContext(), Calc.class); // 넘길 클래스
                startActivityForResult(intent,1);
            }
        });

    }
}

<계산 구현>

 protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_calc);

    editText = findViewById(R.id.editText);

    arrayList = new ArrayList();
    button7 = findViewById(R.id.btn7);
    button8 = findViewById(R.id.btn8);
    button9 = findViewById(R.id.btn9);
    button4 = findViewById(R.id.btn4);
    button5 = findViewById(R.id.btn5);
    button6 = findViewById(R.id.btn6);
    button1 = findViewById(R.id.btn1);
    button2 = findViewById(R.id.btn2);
    button3 = findViewById(R.id.btn3);
    button0 = findViewById(R.id.btn0);
    plu = findViewById(R.id.puls);
    sub = findViewById(R.id.sub);
    mul = findViewById(R.id.mul);
    div = findViewById(R.id.div);
    c = findViewById(R.id.c);
    par1=findViewById(R.id.par1);
    par2=findViewById(R.id.par2);
    AC=findViewById(R.id.ac);

    result = findViewById(R.id.res);
}

public void onClick(View view) {

    if(check_result==true){
        editText.setText("");
        check_result=false;
    }

    if (view == button9) {
        arrayList.add(9);
        editText.setText(editText.getText() + "9");
    } else if (view == button8) {

실행

calc.apk

       

calc.apk