计算器和Menu

MainActivity.java

 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 }

 main.xml

 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>

 

 ResultActivity.java

 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 }

 

result.xml

 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>

 

AndroidManifest.xml

 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>

 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>