android学习笔记08（activity通信的一个实例乘法计算器）

Activity03.java文件：

package tk.myactivity03;

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

public class Activity03 extends Activity {

    private EditText factorOne; 
    private EditText factorTwo; 
    private TextView symbol; 
    private Button calculate; 
    
    
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity03); 
        
        factorOne=(EditText)findViewById(R.id.factorOne); 
        factorTwo=(EditText)findViewById(R.id.factorTwo); 
        symbol=(TextView)findViewById(R.id.symbol); 
        calculate=(Button)findViewById(R.id.calculate); 
        
        symbol.setText(R.string.symbol); 
        calculate.setText(R.string.calculate); 
        
        calculate.setOnClickListener(new CalculateListrner()); 
        
    } 
    
    @Override 
    public boolean onCreatePanelMenu(int featureId, Menu menu) { 
        // TODO Auto-generated method stub 
        menu.add(0, 1, 1, R.string.exit ); 
        menu.add(0, 2, 2, R.string.about); 
        return super.onCreatePanelMenu(featureId, menu); 
    } 
    
    

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
        if(item.getItemId() == 1){ 
            finish(); 
        } 
        return super.onOptionsItemSelected(item); 
    }



    class CalculateListrner implements OnClickListener{

        @Override 
        public void onClick(View v) { 
            String factorOneString=factorOne.getText().toString(); 
            String factorTwoString=factorTwo.getText().toString(); 
            
            Intent intent=new Intent(); 
            intent.putExtra("one", factorOneString); 
            intent.putExtra("two", factorTwoString); 
            intent.setClass(Activity03.this, ResultActivity.class); 
            
            Activity03.this.startActivity(intent); 
            
        } 
        
    
    } 
    

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.activity03, menu); 
        return true; 
    } 
}

ResultActivity.java文件：

package tk.myactivity03;

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

public class ResultActivity  extends Activity{ 
    private TextView resultView=null; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.result); 
        
       resultView=(TextView)findViewById(R.id.result); 
        
        Intent intent=getIntent(); 
        
        String factorOneString=intent.getStringExtra("one"); 
        String factorTwoString=intent.getStringExtra("two"); 
        
        int factorOneInt = Integer.parseInt(factorOneString); 
        int factorTwoInt = Integer.parseInt(factorTwoString); 
        
        int result = factorOneInt * factorTwoInt ; 
        
        resultView.setText("" result); 
        
    } 
}

activity03.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    
    <EditText 
        android:id="@ id/factorOne" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        ></EditText> 
    <TextView 
        android:id="@ id/symbol" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        /> 
    <EditText 
        android:id="@ id/factorTwo" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        ></EditText> 
    <Button 
        android:id="@ id/calculate" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        ></Button> 
</LinearLayout>

result.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
     <TextView 
         android:id="@ id/result" 
         android:layout_width="fill_parent" 
         android:layout_height="wrap_content" 
         /> 
</LinearLayout>

manifest.xml配置文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="tk.myactivity03" 
    android:versionCode="1" 
    android:versionName="1.0" >

    <uses-sdk 
        android:minSdkVersion="8" 
        android:targetSdkVersion="15" />

    <application 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" 
        android:theme="@style/AppTheme" > 
        <activity 
            android:name=".Activity03" 
            android:label="@string/title_activity_activity03" > 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" />

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

</manifest>