初学android，第二个程序就是检查不出错！求解、异常弹出对话框显示stoped unexpected

初学android，第二个程序就是检查不出错！求解、、；错误弹出对话框显示stoped unexpected，
Android Launch!
[2012-03-13 16:42:29 - Activity_03] adb is running normally.
[2012-03-13 16:42:29 - Activity_03] Performing mars.Activity03.Activity03 activity launch
[2012-03-13 16:42:29 - Activity_03] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'android1.6'
[2012-03-13 16:42:34 - Activity_03] Application already deployed. No need to reinstall.
[2012-03-13 16:42:34 - Activity_03] Starting activity mars.Activity03.Activity03 on device emulator-5554
[2012-03-13 16:42:38 - Activity_03] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=mars.Activity03/.Activity03 }

error：
E/AndroidRuntime(805): Uncaught handler: thread main exiting due to uncaught exception
(这个哪里会有异常？?)
03-13 08:50:03.854: E/AndroidRuntime(805): java.lang.RuntimeException: Unable to start activity ComponentInfo{mars.Activity03/mars.Activity03.ResultActivity}: java.lang.NumberFormatException: unable to parse 'null' as integer（我在两个框里输入的都是整数，怎么不能转了?)

Activity03.java内容如下:

Java code


package mars.Activity03;
import android.app.Activity;import android.content.Intent;import android.os.Bundle;
import android.view.View;import android.view.View.OnClickListener;
import android.widget.*;

public class Activity03 extends Activity {
   
    private EditText factorOne,factorTwo;
    private TextView symbol;
    private Button calculate;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根据控件的ID来取得代表控件的对象
        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("乘以");
        //calculate.setText("计算");
        symbol.setText(R.string.symbol);
        calculate.setText(R.string.calculate);
        calculate.setOnClickListener(new CalculateListener());
    }
    class CalculateListener implements OnClickListener{

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            //取得两个
            String factorOneStr=factorOne.getText().toString();
            String factorTwoStr=factorTwo.getText().toString();
            Intent intent=new Intent();
            intent.putExtra("one", factorOneStr);
            intent.putExtra("two", factorTwoStr);
            intent.setClass(Activity03.this, ResultActivity.class);
            Activity03.this.startActivity(intent);
            System.out.println("onClick--error");            
        }    
    }
}

对应main.xml如下：

XML code


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

初学android，第二个程序就是检查不出错！求解、异常弹出对话框显示stoped unexpected

相关推荐