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>