计算器和Menu

 1 import android.app.Activity;
 2 import android.content.Intent;
 3 import android.os.Bundle;
 4 import android.view.Menu;
 5 import android.view.MenuItem;
 6 import android.view.View;
 7 import android.view.View.OnClickListener;
 8 import android.widget.Button;
 9 import android.widget.EditText;
10 
11 public class MainActivity extends Activity {
12     private EditText EditTextOne;
13     private EditText EditTextTwo;
14     private Button myButton;
15     
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.main);
20         EditTextOne = (EditText) findViewById(R.id.EditTextOne);
21         EditTextTwo = (EditText) findViewById(R.id.EditTextTwo);
22         myButton = (Button) findViewById(R.id.myButton);
23         myButton.setOnClickListener(new myButtonListener());
24     }
25     
26     class myButtonListener implements OnClickListener{
27         public void onClick(View v) {
28             Intent intent = new Intent();
29             String first = EditTextOne.getText().toString();
30             String second = EditTextTwo.getText().toString();
31             
32             intent.putExtra("one",first );
33             intent.putExtra("two", second);
34             
35             intent.setClass(MainActivity.this, ResultActivity.class);
36             startActivity(intent);
37         }
38         
39     }
40     //当客户点击MENU按钮的时候，调用该方法
41     public boolean onCreateOptionsMenu(Menu menu) {
42         //一个add对应就产生一个选项
43         menu.add(0, 1, 1, R.string.exit);
44         menu.add(0, 2, 2, R.string.about);
45         return super.onCreateOptionsMenu(menu);
46     }
47     //当客户点击菜单当中的某一个选项时，会调用该方法
48     public boolean onOptionsItemSelected(MenuItem item) {
49         if(item.getItemId() == 1){
50             finish();
51         }
52         return super.onOptionsItemSelected(item);
53     }
54     
55 
56 
57 }

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context=".MainActivity" >
11     
12     <EditText
13         android:id="@+id/EditTextOne"
14         android:layout_width="fill_parent"
15         android:layout_height="wrap_content"
16         />"
17 
18     <TextView
19         android:layout_width="fill_parent"
20         android:layout_height="wrap_content"
21         android:text="@string/result" 
22         />
23 
24     
25     <EditText
26         android:id="@+id/EditTextTwo"
27         android:layout_width="fill_parent"
28         android:layout_height="wrap_content"
29         />
30     
31     <Button
32         android:id="@+id/myButton"
33          android:layout_width="wrap_content"
34         android:layout_height="wrap_content"
35         android:text="@string/calculate" 
36         />
37 </LinearLayout>

 1 import android.app.Activity;
 2 import android.content.Intent;
 3 import android.os.Bundle;
 4 import android.widget.TextView;
 5 
 6 public class ResultActivity extends Activity{
 7     private TextView myTextView;
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.result);
11         //获取Intent对象
12         Intent intent = getIntent();
13         //得到Intent对象当中的值 
14         String factorOneStr = intent.getStringExtra("one");
15         String factorTwoStr = intent.getStringExtra("two");
16         //将接收到的字符串转换成整数
17         int factorOneInt = Integer.parseInt(factorOneStr);
18         int factorOneTwo = Integer.parseInt(factorTwoStr);
19         //计算两个数的值
20         int result = factorOneInt*factorOneTwo;
21         
22         
23         myTextView = (TextView) findViewById(R.id.myTextView);
24         myTextView.setText(result);
25         
26     }
27     
28 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7     <TexiView
 8         android:id="@+id/myTextView"
 9         android:layout_width="fill_parent"
10         android:layout_height="wrap_content"
11         />
12     
13 
14 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.mars.widget"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="8"
 9         android:targetSdkVersion="18" />
10 
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="com.mars.widget.MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21 
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25         <activity android:name="com.mars.widget.ResultActivity" android:label="@string/result"/>"
26     </application>
27 
28 </manifest>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">EditText控件和menu控件</string>
    <string name="action_settings">Settings</string>
    <string name="result">乘以</string>
    <string name="calculate">计算</string>
    <string name="exit">退出</string>
    <string name="about">关于</string>
    

</resources>