深入浅出Android：重构程序(BMI) - lovemu

1、MainActivity.java
 1 package example.bmi;
 2 
 3 import java.text.DecimalFormat;
 4 
 5 import android.os.Bundle;
 6 import android.app.Activity;
 7 import android.view.Menu;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.EditText;
12 import android.widget.TextView;
13 
14 public class MainActivity extends Activity {
15 
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20         
21         findViews();
22         setListensers();
23     }
24     private Button button_calc;
25     private EditText field_height;
26     private EditText field_weight;
27     private TextView view_result;
28     private TextView view_suggest;
29     private void findViews()
30     {
31         button_calc=(Button)findViewById(R.id.submit);
32         field_height=(EditText)findViewById(R.id.height);
33         field_weight=(EditText)findViewById(R.id.weight);
34         view_result=(TextView)findViewById(R.id.result);
35         view_suggest=(TextView)findViewById(R.id.suggest);
36     }
37     private void setListensers()
38     {
39         button_calc.setOnClickListener(calcBMI);
40     }
41     private Button.OnClickListener calcBMI=new Button.OnClickListener()
42     {
43         public void onClick(View v)
44         {
45             DecimalFormat nf=new DecimalFormat("0.00");
46             double height=Double.parseDouble(field_height.getText().toString())/100;
47             double weight=Double.parseDouble(field_weight.getText().toString());
48             double BMI=weight/(height*height);
49             view_result.setText(getText(R.string.bmi_result)+nf.format(BMI));
50             //give health advice
51             if(BMI>25)
52             {
53                 view_suggest.setText(R.string.advice_heavy);
54             }
55             else if(BMI<20)
56             {
57                 view_suggest.setText(R.string.advice_light);
58                }
59             else
60             {
61                 view_suggest.setText(R.string.advice_average);
62             }
63         }    
64     };
65 
66     @Override
67     public boolean onCreateOptionsMenu(Menu menu) {
68         // Inflate the menu; this adds items to the action bar if it is present.
69         getMenuInflater().inflate(R.menu.activity_main, menu);
70         return true;
71     }
72     
73 }
2、显示结果
posted on 2012-11-29 16:07 lovemu 阅读(596) 评论(0) 收藏举报
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