Selanjutnya kita buat design dan script kodenya :
A.
kode acticity_main
<RelativeLayout
android:layout_width="368dp"
android:layout_height="495dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<Button
android:id="@+id/btn_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/edText1"
android:layout_marginTop="60dp"
android:onClick="PressOne"
android:text="1"
android:textSize="18sp"
tools:ignore="OnClick" />
<Button
android:id="@+id/btn_0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_8"
android:layout_toEndOf="@+id/btn_7"
android:layout_toRightOf="@+id/btn_7"
android:text="0"
android:textSize="18sp" />
<Button
android:id="@+id/btn_9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_6"
android:layout_toEndOf="@+id/btn_5"
android:layout_toRightOf="@+id/btn_5"
android:text="9"
android:textSize="18sp" />
<Button
android:id="@+id/btn_8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_5"
android:layout_toEndOf="@+id/btn_7"
android:layout_toRightOf="@+id/btn_7"
android:text="8"
android:textSize="18sp" />
<Button
android:id="@+id/btn_7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_4"
android:layout_alignStart="@+id/btn_4"
android:layout_below="@+id/btn_4"
android:text="7"
android:textSize="18sp" />
<Button
android:id="@+id/btn_6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btn_5"
android:layout_alignBottom="@+id/btn_5"
android:layout_toEndOf="@+id/btn_5"
android:layout_toRightOf="@+id/btn_5"
android:text="6"
android:textSize="18sp" />
<Button
android:id="@+id/btn_5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_2"
android:layout_toEndOf="@+id/btn_4"
android:layout_toRightOf="@+id/btn_4"
android:text="5"
android:textSize="18sp" />
<Button
android:id="@+id/btn_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_1"
android:layout_alignStart="@+id/btn_1"
android:layout_below="@+id/btn_1"
android:text="4"
android:textSize="18sp" />
<Button
android:id="@+id/btn_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btn_2"
android:layout_alignBottom="@+id/btn_2"
android:layout_toEndOf="@+id/btn_2"
android:layout_toRightOf="@+id/btn_2"
android:text="3"
android:textSize="18sp" />
<Button
android:id="@+id/btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btn_1"
android:layout_alignBottom="@+id/btn_1"
android:layout_toEndOf="@+id/btn_1"
android:layout_toRightOf="@+id/btn_1"
android:text="2"
android:textSize="18sp" />
<Button
android:id="@+id/btn_Add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btn_6"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:backgroundTint="@android:color/darker_gray"
android:text="+"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
<Button
android:id="@+id/btn_Sub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_Add"
android:layout_alignStart="@+id/btn_Add"
android:layout_below="@+id/btn_Add"
android:backgroundTint="@android:color/darker_gray"
android:text="-"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
<Button
android:id="@+id/btn_Mul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_Sub"
android:layout_alignStart="@+id/btn_Sub"
android:layout_below="@+id/btn_6"
android:backgroundTint="@android:color/darker_gray"
android:text="*"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
<Button
android:id="@+id/btn_Div"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_Mul"
android:layout_alignStart="@+id/btn_Mul"
android:layout_below="@+id/btn_9"
android:backgroundTint="@android:color/darker_gray"
android:text="/"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
<EditText
android:id="@+id/edText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="22dp"
android:ems="10"
android:inputType="textPersonName"
android:textAlignment="textEnd"
android:textSize="24sp" />
<Button
android:id="@+id/btn_calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_0"
android:layout_marginStart="6dp"
android:layout_marginLeft="6dp"
android:layout_marginTop="-41dp"
android:layout_toEndOf="@+id/btn_0"
android:layout_toRightOf="@+id/btn_0"
android:backgroundTint="@android:color/holo_green_light"
android:text="="
android:textColor="@android:color/background_light"
android:textSize="18sp" />
<Button
android:id="@+id/btn_dec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_7"
android:layout_toLeftOf="@+id/btn_8"
android:layout_toStartOf="@+id/btn_8"
android:text="."
android:textSize="18sp" />
<Button
android:id="@+id/btn_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/btn_Div"
android:backgroundTint="@android:color/holo_blue_dark"
android:text="clear"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
</RelativeLayout>
B.
Kode MainActicity
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
Button
btn_1,btn_2,btn_3,btn_4,btn_5,btn_6,btn_7,btn_8,btn_9,btn_0,btn_Add,btn_Sub,btn_Mul,btn_Div,btn_calc,btn_dec,btn_clear;
EditText
ed1;
float
Value1, Value2;
boolean
mAddition, mSubtract, mMultiplication, mDivision ;
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_0 =
(Button) findViewById(R.id.btn_0);
btn_1 =
(Button) findViewById(R.id.btn_1);
btn_2 = (Button) findViewById(R.id.btn_2);
btn_3 =
(Button) findViewById(R.id.btn_3);
btn_4 =
(Button) findViewById(R.id.btn_4);
btn_5 =
(Button) findViewById(R.id.btn_5);
btn_6 =
(Button) findViewById(R.id.btn_6);
btn_7 = (Button) findViewById(R.id.btn_7);
btn_8 =
(Button) findViewById(R.id.btn_8);
btn_9 =
(Button) findViewById(R.id.btn_9);
btn_Add
= (Button) findViewById(R.id.btn_Add);
btn_Div
= (Button) findViewById(R.id.btn_Div);
btn_Sub
= (Button) findViewById(R.id.btn_Sub);
btn_Mul
= (Button) findViewById(R.id.btn_Mul);
btn_calc
= (Button) findViewById(R.id.btn_calc);
btn_dec
= (Button) findViewById(R.id.btn_dec);
btn_clear = (Button) findViewById(R.id.btn_clear);
ed1 =
(EditText) findViewById(R.id.edText1);
btn_0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"0");
}
});
btn_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"1");
}
});
btn_2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"2");
}
});
btn_3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"3");
}
});
btn_4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"4");
}
});
btn_5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"5");
}
});
btn_6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"6");
}
});
btn_7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"7");
}
});
btn_8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"8");
}
});
btn_9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+"9");
}
});
btn_dec.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText(ed1.getText()+".");
}
});
btn_Add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ed1 == null){
ed1.setText("");
}else {
Value1 = Float.parseFloat(ed1.getText() + "");
mAddition = true;
ed1.setText(null);
}
}
});
btn_Sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Value1 = Float.parseFloat(ed1.getText() + "");
mSubtract = true ;
ed1.setText(null);
}
});
btn_Mul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Value1 = Float.parseFloat(ed1.getText() + "");
mMultiplication = true ;
ed1.setText(null);
}
});
btn_Div.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Value1 = Float.parseFloat(ed1.getText()+"");
mDivision = true ;
ed1.setText(null);
}
});
btn_calc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Value2 = Float.parseFloat(ed1.getText() + "");
if (mAddition == true){
ed1.setText(Value1 + Value2 +"");
mAddition=false;
}
if (mSubtract == true){
ed1.setText(Value1 - Value2 +"");
mSubtract=false;
}
if (mMultiplication == true){
ed1.setText(Value1 * Value2 + "");
mMultiplication=false;
}
if (mDivision == true){
ed1.setText(Value1 / Value2+"");
mDivision=false;
}
}
});
btn_clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ed1.setText("");
}
});
}
}
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