android乘法计算器

package com.zachary.multiplication;

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 EnterActivity extends Activity {

    private Button myButton = null;
    private EditText factorOne = null;
    private EditText factorTwo = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_enter);
        factorOne = (EditText)findViewById(R.id.factorOne);
        factorTwo = (EditText)findViewById(R.id.factorTwo);
        myButton = (Button)findViewById(R.id.resultButton);
        myButton.setOnClickListener(new MyButtonListener());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.enter, menu);
        menu.add(0,1,1,R.string.exit);
        menu.add(0,2,2,R.string.about);
        return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        if(item.getItemId()==1)
            finish();
        return super.onOptionsItemSelected(item);
    }

    class MyButtonListener implements OnClickListener {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            String factorOneStr = factorOne.getText().toString();
            String factorTwoStr = factorTwo.getText().toString();
            Intent intent = new Intent();
            intent.putExtra("num1",factorOneStr);
            intent.putExtra("num2",factorTwoStr);
            intent.setClass(EnterActivity.this, ResultActivity.class);
            EnterActivity.this.startActivity(intent);
        }
    }
}

package com.zachary.multiplication;

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

public class ResultActivity extends Activity{

    private TextView resultTextView = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_result);
        Intent intent = getIntent();
        resultTextView = (TextView)findViewById(R.id.resultTextView);
        int factorOneNum = Integer.parseInt(intent.getStringExtra("num1"));
        int factorTwoNum = Integer.parseInt(intent.getStringExtra("num2"));
        int resultNum = factorOneNum * factorTwoNum;
        resultTextView.setText(resultNum+"");
    }

}

<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"
        android:hint="@string/editText"
        android:numeric="integer"
        />
    <TextView android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/mult"
        />
    <EditText android:id="@+id/factorTwo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="@string/editText"
        android:numeric="integer"
        />
    <Button android:id="@+id/resultButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/result"
        />"
</LinearLayout>

<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/resultTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />    
</LinearLayout>