public class MainActivity extends AppCompatActivity implements View.OnClickListener{
EditText edtWidth, edtHeight, edtLength;
Button btnCalculate;
TextView tvResult;
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edtWidth = findViewById(R.id.edt_width);
edtHeight = findViewById(R.id.edt_height);
edtLength = findViewById(R.id.edt_length);
btnCalculate = findViewById(R.id.btn_calculate);
tvResult = findViewById(R.id.tv_result);
btnCalculate.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.btn_calculate){
String inputLength = edtLength.getText().toString().trim();
String inputWidth = edtWidth.getText().toString().trim();
String inputHeight = edtHeight.getText().toString().trim();
boolean isEmptyFields = false;
boolean isInvalidDouble = false;
if (TextUtils.isEmpty(inputLength)){
isEmptyFields = true;
edtLength.setError("Field Ini Tidak Boleh Kosong"
);
}
if (TextUtils.isEmpty(inputWidth)){
isEmptyFields = true;
edtWidth.setError("Field Ini Tidak Boleh Kosong");
}
if (TextUtils.isEmpty(inputHeight)){
isEmptyFields = true;
edtHeight.setError("Field Ini Tidak Boleh Kosong");
}
Double length = toDouble (inputLength);
Double width = toDouble (inputWidth);
Double height = toDouble (inputHeight);
if (length == null) {
isInvalidDouble = true;
edtLength.setError("Field ini harus berupa nomer yang valid");
}
if (width == null) {
isInvalidDouble = true;
edtWidth.setError("Field ini harus berupa nomer yang valid");
}
if (height == null) {
isInvalidDouble = true;
edtHeight.setError("Field ini harus berupa nomer yang valid");
}
if (!isEmptyFields && !isInvalidDouble) {
double volume = length * width * height;
tvResult.setText(String.valueOf(volume));
}
}
}
private Double toDouble(String str) {
try {
return Double.valueOf(str);
} catch (NumberFormatException e) {
return null;
}
}
}
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