深入浅出Android：添加菜单(BMI) - lovemu

1、MainActivity.java
  1 package example.bmi;
  2 
  3 import java.text.DecimalFormat;
  4 
  5 import android.net.Uri;
  6 import android.os.Bundle;
  7 import android.app.Activity;
  8 import android.app.AlertDialog;
  9 import android.content.ClipData.Item;
 10 import android.content.DialogInterface;
 11 import android.content.Intent;
 12 import android.view.Menu;
 13 import android.view.MenuItem;
 14 import android.view.View;
 15 import android.view.View.OnClickListener;
 16 import android.widget.Button;
 17 import android.widget.EditText;
 18 import android.widget.TextView;
 19 
 20 public class MainActivity extends Activity {
 21 
 22     @Override
 23     protected void onCreate(Bundle savedInstanceState) {
 24         super.onCreate(savedInstanceState);
 25         setContentView(R.layout.activity_main);
 26         
 27         findViews();
 28         setListensers();
 29     }
 30     private Button button_calc;
 31     private EditText field_height;
 32     private EditText field_weight;
 33     private TextView view_result;
 34     private TextView view_suggest;
 35     private void findViews()
 36     {
 37         button_calc=(Button)findViewById(R.id.submit);
 38         field_height=(EditText)findViewById(R.id.height);
 39         field_weight=(EditText)findViewById(R.id.weight);
 40         view_result=(TextView)findViewById(R.id.result);
 41         view_suggest=(TextView)findViewById(R.id.suggest);
 42     }
 43     private void setListensers()
 44     {
 45         button_calc.setOnClickListener(calcBMI);
 46     }
 47     private Button.OnClickListener calcBMI=new Button.OnClickListener()
 48     {
 49         public void onClick(View v)
 50         {
 51             DecimalFormat nf=new DecimalFormat("0.00");
 52 
 53             double height=Double.parseDouble(field_height.getText().toString())/100;
 54             double weight=Double.parseDouble(field_weight.getText().toString());
 55             double BMI=weight/(height*height);
 56             view_result.setText(getText(R.string.bmi_result)+nf.format(BMI));
 57             //give health advice
 58             if(BMI>25)
 59             {
 60                 view_suggest.setText(R.string.advice_heavy);
 61             }
 62             else if(BMI<20)
 63             {
 64                 view_suggest.setText(R.string.advice_light);
 65                }
 66             else
 67             {
 68                 view_suggest.setText(R.string.advice_average);
 69             }
 70         //    openOptionsDialog();
 71         }    
 72     };
 73     protected static final int MENU_ABOUT = Menu.FIRST;
 74     protected static final int MENU_Quit = Menu.FIRST+1;
 75     
 76     @Override
 77     public boolean onCreateOptionsMenu(Menu menu)
 78     {
 79         super.onCreateOptionsMenu(menu);
 80         menu.add(0, MENU_ABOUT, 0, "关于");
 81         menu.add(0, MENU_Quit, 0, "结束");
 82         return true;
 83     }
 84     public boolean onOptionsItemSelected(MenuItem item)
 85     {
 86         super.onOptionsItemSelected(item);
 87         switch(item.getItemId())
 88         {
 89         case MENU_ABOUT:
 90             openOptionsDialog();
 91             break;
 92         case MENU_Quit:
 93             finish();
 94             break;
 95         }
 96         return true;
 97     }
 98     private void openOptionsDialog()
 99     {
100         new AlertDialog.Builder(MainActivity.this)
101             .setTitle(R.string.about_title)
102             .setMessage(R.string.about_msg)
103             .setPositiveButton(R.string.ok_label,
104                     new DialogInterface.OnClickListener() {
105                 public void onClick(
106                         DialogInterface dialoginterface,int i){
107                    }
108                 
109                 })
110             .setNegativeButton(R.string.homepage_label,
111                     new DialogInterface.OnClickListener() {
112                         
113                         @Override
114                         public void onClick(DialogInterface dialog, int which) {
115                             // TODO Auto-generated method stub
116                             Uri uri=Uri.parse(getString(R.string.homepage_uri));
117                             Intent intent=new Intent(Intent.ACTION_VIEW,uri);
118                             startActivity(intent);
119                         }
120                     })
121             .show();
122     }
123 
124   /*  @Override
125     public boolean onCreateOptionsMenu(Menu menu) {
126         // Inflate the menu; this adds items to the action bar if it is present.
127         getMenuInflater().inflate(R.menu.activity_main, menu);
128         return true;
129     }
130     */
131 }
posted on 2012-11-30 16:40 lovemu 阅读(387) 评论(0) 收藏举报
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