计算器和Menu

MainActivity.java

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;

 public class MainActivity extends Activity {
     private EditText EditTextOne;
     private EditText EditTextTwo;
     private Button myButton;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         EditTextOne = (EditText) findViewById(R.id.EditTextOne);
         EditTextTwo = (EditText) findViewById(R.id.EditTextTwo);
         myButton = (Button) findViewById(R.id.myButton);
         myButton.setOnClickListener(new myButtonListener());
     }

     class myButtonListener implements OnClickListener{
         public void onClick(View v) {
             Intent intent = new Intent();
             String first = EditTextOne.getText().toString();
             String second = EditTextTwo.getText().toString();

             intent.putExtra("one",first );
             intent.putExtra("two", second);

             intent.setClass(MainActivity.this, ResultActivity.class);
             startActivity(intent);
         }

     }
     //当客户点击MENU按钮的时候，调用该方法
     public boolean onCreateOptionsMenu(Menu menu) {
         //一个add对应就产生一个选项
         menu.add(0, 1, 1, R.string.exit);
         menu.add(0, 2, 2, R.string.about);
         return super.onCreateOptionsMenu(menu);
     }
     //当客户点击菜单当中的某一个选项时，会调用该方法
     public boolean onOptionsItemSelected(MenuItem item) {
         if(item.getItemId() == 1){
             finish();
         }
         return super.onOptionsItemSelected(item);
     }

 }

main.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >

     <EditText
         android:id="@+id/EditTextOne"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         />"

     <TextView
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="@string/result"
         />

     <EditText
         android:id="@+id/EditTextTwo"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         />

     <Button
         android:id="@+id/myButton"
          android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/calculate"
         />
 </LinearLayout>

ResultActivity.java

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.widget.TextView;

 public class ResultActivity extends Activity{
     private TextView myTextView;
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.result);
         //获取Intent对象
         Intent intent = getIntent();
         //得到Intent对象当中的值
         String factorOneStr = intent.getStringExtra("one");
         String factorTwoStr = intent.getStringExtra("two");
         //将接收到的字符串转换成整数
         int factorOneInt = Integer.parseInt(factorOneStr);
         int factorOneTwo = Integer.parseInt(factorTwoStr);
         //计算两个数的值
         int result = factorOneInt*factorOneTwo;

         myTextView = (TextView) findViewById(R.id.myTextView);
         myTextView.setText(result);

     }

 }

result.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <TexiView
         android:id="@+id/myTextView"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         />

 </LinearLayout>

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.mars.widget"
     android:versionCode="1"
     android:versionName="1.0" >

     <uses-sdk
         android:minSdkVersion="8"
         android:targetSdkVersion="18" />

     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name="com.mars.widget.MainActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity android:name="com.mars.widget.ResultActivity" android:label="@string/result"/>"
     </application>

 </manifest>

string.xml

<?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>