在android studio中将double分成整数和小数部分

Question

我试图在android studio中将十进制数分成整数和点

Button btSpilt;

EditText Input;

TextView wholenumber, points;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_test);

    wholenumber = (TextView) findViewById(R.id.wholenumber);

    points = (TextView) findViewById(R.id.points);

    Input = (EditText) findViewById(R.id.Input);

    btSpilt = (Button) findViewById(R.id.btSpilt);

    btSpilt = findViewById(R.id.btSpilt);

    btSpilt.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            String s_input = Input.getText().toString();

            double input = Double.parseDouble(s_input);

            int a = Integer.parseInt(s_input);

            double aa = a;

            double b = (10 * input - 10 * input)/10;

            String str_a = Integer.toString((int) aa);

            String str_b = Integer.toString((int) b);

            wholenumber.setText(str_a);

            points.setText(str_b);

        }

    });

输入整数时效果很好，但输入小数时整个应用程序崩溃

Answer 1

Math.floor()将对此有所帮助：https : //docs.oracle.com/javase/7/docs/api/java/lang/Math.html#floor(double)        double input = Double.parseDouble(s_input);                 double wholeNumber = Math.floor(input);                         double afterDecimal = input - wholeNumber;

Answer 2

int a = Integer.parseInt(s_input);//this line caused error when s_input represents decimal.double b = (10 * input - 10 * input)/10;//b always equal zero要获得双精度数的整数部分和小数部分，您可以尝试使用split                String s_input = Input.getText().toString();                if (s_input.contains(".")) {                    String[] split = s_input.split("\\.");                    String whole = split[0];                    String fractional = split[1];                }