안드로이드 계산기

안드로이드 계산기앱 (TableLayout 만든거)

[activity_main.xml]

<?xml version="1.0" encoding="utf-8"?>
<TableLayout               
                --생략--
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:shrinkColumns="*"
    android:padding="10dp"
    tools:context="com.example.lhcdesktop.myapplication.MainActivity">
    <TableRow>
        <EditText
            android:id="@+id/edt1"
            android:layout_span="5"
            android:hint="숫자1입력"/>
    </TableRow>

    <TableRow>
        <EditText
            android:id="@+id/edt2"
            android:layout_span="5"
            android:hint="숫자2입력"/>
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btn0"
            android:text="0"/>
        <Button
            android:id="@+id/btn1"
            android:text="1"/>
        <Button
            android:id="@+id/btn2"
            android:text="2"/>
        <Button
            android:id="@+id/btn3"
            android:text="3"/>
        <Button
            android:id="@+id/btn4"
            android:text="4"/>
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btn5"
            android:text="5"/>
        <Button
            android:id="@+id/btn6"
            android:text="6"/>
        <Button
            android:id="@+id/btn7"
            android:text="7"/>
        <Button
            android:id="@+id/btn8"
            android:text="8"/>
        <Button
            android:id="@+id/btn9"
            android:text="9"/>
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btnplus"
            android:layout_span="5"
            android:text="더하기"
            />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btnminus"
            android:layout_span="5"
            android:text="빼기"
            />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btndivide"
            android:layout_span="5"
            android:text="나누기"
            />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btngobhagi"
            android:layout_span="5"
            android:text="곱하기"
            />
    </TableRow>

    <TableRow>
        <Button
            android:id="@+id/btnclear"
            android:layout_span="5"
            android:text="clear"
            />
    </TableRow>

    <TableRow>
        <TextView
            android:textColor="#ff0000"
            android:layout_span="5"
            android:id="@+id/txtV"
            android:text="계산 결과 : "
            android:textSize="25dp"
            android:background="#ffe100"/>
    </TableRow>
</TableLayout>

[MainActivity.java]

                --생략--
public class MainActivity extends AppCompatActivity {

    EditText edtNum1,edtNum2;
    Button[] buttonNum=new Button[10];
    Button btnAdd,btnMul,btnMinus,btnDiv,btnClear,btngobhagi;
    TextView txtResult;
    Integer[] btnID={R.id.btn0,R.id.btn1,R.id.btn2,R.id.btn3,R.id.btn4,
            R.id.btn5,R.id.btn6,R.id.btn7,R.id.btn8,R.id.btn9};
    String num1,num2;
    Integer result;


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

        setTitle("간단한계산기");

        txtResult=(TextView)findViewById(R.id.txtV);
        edtNum1=(EditText)findViewById(R.id.edt1);
        edtNum2=(EditText)findViewById(R.id.edt2);
        btnAdd=(Button)findViewById(R.id.btnplus);
        btnMinus=(Button)findViewById(R.id.btnminus);
        btnDiv=(Button)findViewById(R.id.btndivide);
        btngobhagi=(Button)findViewById(R.id.btngobhagi);
        btnClear=(Button)findViewById(R.id.btnclear);

        //숫자버튼 초기화 (연속처리하기)
        for(int i=0;i<buttonNum.length;i++){
            buttonNum[i]=(Button)findViewById(btnID[i]);
        }

        for(int i=0;i<buttonNum.length;i++){
            final int index=i;
            buttonNum[i].setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(edtNum1.isFocused()){
                        num1=edtNum1.getText().toString()+buttonNum[index].getText().toString();    //에러남 ..(지역변수라.. 지역변수는 사용하고 끝나면 없어짐... 그래서 final함수를 사용한거야!!)
                        edtNum1.setText(num1);
                    }else if(edtNum2.isFocused()){
                        num2=edtNum2.getText().toString()+buttonNum[index].getText().toString();
                        edtNum2.setText(num2);
                    }else{
                        Toast.makeText(getApplicationContext(),"숫자를 입력하세여",Toast.LENGTH_LONG).show();
                    }
                }
            });
        }

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1=edtNum1.getText().toString();
                num2=edtNum2.getText().toString();
                result=Integer.parseInt(num1)+Integer.parseInt(num2);
                txtResult.setText("계산 결과 : "+result.toString());


            }
        });

        btnMinus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1=edtNum1.getText().toString();
                num2=edtNum2.getText().toString();
                result=Integer.parseInt(num1)-Integer.parseInt(num2);
                txtResult.setText("계산 결과 : "+result.toString());
            }
        });

        btnDiv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1=edtNum1.getText().toString();
                num2=edtNum2.getText().toString();
                result=Integer.parseInt(num1)/Integer.parseInt(num2);
                txtResult.setText("계산 결과 : "+result.toString());
            }
        });

        btngobhagi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                num1=edtNum1.getText().toString();
                num2=edtNum2.getText().toString();
                result=Integer.parseInt(num1)*Integer.parseInt(num2);
                txtResult.setText("계산 결과 : "+result.toString());
            }
        });

        btnClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                edtNum1.setText("");
                edtNum2.setText("");
                txtResult.setText("계산 결과 : ");
            }
        });
    }
}