Android BMI

package cc.i420.bmi1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.text.NumberFormat;

public class MainActivity extends AppCompatActivity {
    EditText h;
    EditText w;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        h = (EditText) findViewById(R.id.height);
        w = (EditText) findViewById(R.id.weight);
        Button submit = (Button) findViewById(R.id.submit);
        submit.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                onClick();
            }

            private void onClick() {
                if (!("".equals(h.getText().toString()) || "".equals(w.getText().toString()))) {
                    float fh = Float.parseFloat(h.getEditableText().toString());
                    float fw = Float.parseFloat(w.getEditableText().toString());
                    float fresult;
                    TextView result = (TextView) findViewById(R.id.result);
                    fh = fh / 100;
                    fh = fh * fh;
                    NumberFormat nf = NumberFormat.getInstance();
                    nf.setMinimumFractionDigits(2);
                    fresult = fw / fh;
                    result.setText(nf.format(fw / fh) + "");
                    TextView diagnosis = (TextView) findViewById(R.id.diagnosis);
                    if (fresult < 18.5)
                        diagnosis.setText("體重過輕！");
                    else if (18.5 <= fresult && fresult < 24)
                        diagnosis.setText("正常範圍");
                    else if (24 <= fresult && fresult < 27)
                        diagnosis.setText("過    重");
                    else if (27 <= fresult && fresult < 30)
                        diagnosis.setText("輕度肥胖！");
                    else if (30 <= fresult && fresult < 35)
                        diagnosis.setText("中度肥胖！");
                    else if (fresult >= 35)
                        diagnosis.setText("重度肥胖！！！");
                }
            }
        });
    }
}