Go语言视频零基础入门到精通

njjwheu

package android.BMI;
import java.text.DecimalFormat;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public classBMIextends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        findviews();
        setListensers();
     }
   
private Button button_calc;
private EditText field_height;
private EditText field_weight;
private TextView view_result;
private TextView view_suggest;

private void findviews(){
  button_calc = (Button) findViewById(R.id.submit);
  field_height = (EditText) findViewById(R.id.height);
  field_weight = (EditText) findViewById(R.id.weight);
  view_result = (TextView) findViewById(R.id.result);
  view_suggest = (TextView) findViewById(R.id.suggest);
}
//Listen for button clicks
private void setListensers() {
        button_calc.setOnClickListener(calcBMI);
}

private Button.OnClickListener calcBMI =new Button.OnClickListener(){
  public void OnClick(View v) {
          DecimalFormat nf = new Decimalformat("0.0");
          double height = Double.parseDouble(field_height.getText().toString())/100;
          double weight = Double.parseDouble(field_weight.getText().toString())/100;
          doubleBMI=weight / (height*height);
          //present result
          view_result.setText(R.string.bmi_result) + nf.format(BMI);
         
          if(BMI>25) {
                  view_suggest.setText(R.string.advice_heavy);
          }else if(BMI<20) {
                  view_suggest.setText(R.string.advice_light);
          }else{
                  view_suggest.setText(R.string.advice_average);
          }
    }
  };

   
}

红色字体时出错地方  谢谢

小飞哥

class BMI extends