thread main exiting due to uncaught exception

            // 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=""
    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>

 

ResultActivity。java内容如下：

Java code
package mars.Activity03;
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;
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);
        System.out.println("resultActivity--error");
        resultView=(TextView)findViewById(R.id.result);
        Intent intent=getIntent();System.out.println("哪里错哦了！！");
        String factorOneStr=intent.getStringExtra("one");
        String factorTwoStr=intent.getStringExtra("Two");
        int factorOneInt=Integer.parseInt(factorOneStr);
        int factorTwoInt=Integer.parseInt(factorTwoStr);
        int result=factorOneInt*factorTwoInt;
        resultView.setText(result+"");
        System.out.println("哪里错哦了！！--最后");
    }

}

对应result.xml如下:

XML code
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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>

 

string。xml如下：

XML code
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, Activity03!</string>
    <string name="app_name">Activity03</string>
    <string name="resultLabel">ResultActivity</string>
    <string name="symbol">乘以</string>
    <string name="calculate">计算</string>
       
</resources>

 

AndroidManifest.xml如下：

XML code<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
    package="mars.Activity03"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".Activity03"
            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=".ResultActivity" android:label="@string/resultLabel"></activity>
    </application></manifest>

这里的two是小写
intent.putExtra("two", factorTwoStr);
这里的Two第一个字母是大写，所以得不到值，为空。
String factorTwoStr=intent.getStringExtra("Two");

大、 小写是有区别的噢。

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