下面android代码总说 the application FirstActivity(process mars.FirstActivity) has stopped unexpecte

Question

package mars.FirstActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FirstActivity extends Activity {
/** Called when the activity is first created. */
private Button button = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.frist);
button = (Button)findViewById(R.id.FirstButton);
button.setText("第一个按钮");
button.setOnClickListener(new ButtonListener());
}
class ButtonListener implements OnClickListener{

public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(FirstActivity.this, SecondActivity.class);
startActivity(intent);
}
}
}

SecondActivity.java 跟FirstActivity 结构几乎一样。
大虾们帮忙看一下。
R.layout.First
只有这些
<?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"
>
<Button
android:id="@+id/FirstButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

Answer 1

看不出有什么不对的，你确定AndroidManifest.xml里面把这两个Activity包含进去了？

Answer 2

你的layout下面的xml的名字叫first.xml?
你用ctrl点first，看能不能找到对应的值！