我有一个按钮，它会弹出一个带有 OK 按钮的对话框，当我单击 OK 按钮时，我得到了一个 nullpointerexception。有谁知道出了什么问题？
这是我的java代码。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylist);
myListView = (ListView)findViewById(R.id.list);
new GetStuff().execute();
Button importButton = (Button)findViewById(R.id.doButton);
importButton.setEnabled(false);
importButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
final Dialog pwdDialog = new Dialog(context);
pwdDialog.setContentView(R.layout.pwdentry);
pwdDialog.setTitle("Enter password");
TextView pwdText = (TextView)pwdDialog.findViewById(R.id.pwdText);
pwdText.setText("Enter password");
Button okBut = (Button)findViewById(R.id.okBut);
okBut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pwdDialog.dismiss();
}
});
pwdDialog.show();
}
});
}
这是 XML 文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/pwdText"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Enter password"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/pwdEntry"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/pwdText"
android:ems="10"
android:inputType="numberPassword" >
<requestFocus />
</EditText>
<Button
android:id="@+id/okBut"
style="?android:attr/buttonStyleSmall"
android:layout_width="100px"
android:layout_height="wrap_content"
android:layout_below="@+id/pwdEntry"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:text="OK" />
</RelativeLayout>
谢谢！