android 自定义dialog,老报错! 请高手指教,该如何解决

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android 自定义dialog,老报错! 请高手指教

有关于android 自定义对话框, 怎么才能拿到dialog界面上的值? 现在是启动dialog画面后,在text里面输入值后,单击确认按钮,就报错!.解决了马上给分,请高手看小弟的代码:


Java code
public class MainActivity extends Activity {
        private Button btn=null;
        private EditText etxt=null;
        private TextView txt=null;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn=(Button)findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener(){
                
                        @Override
                        public void onClick(View arg0) {
                                // TODO Auto-generated method stub
                                showDialog(1);
                        }});
    
    }
        @Override
        protected Dialog onCreateDialog(int id) {
                // TODO Auto-generated method stub
                Dialog dialog=null;
                if(id==1)
                {
                        LayoutInflater inflater=LayoutInflater.from(this);
                        View layout=inflater.inflate(R.layout.dialog, null);
                        Builder builder2=new Builder(this);
                        builder2.setTitle("DialogTest");
                        builder2.setView(layout);
                        
                        DialogInterface.OnClickListener btnListener2=new DialogInterface.OnClickListener(){
                                @Override
                                public void onClick(DialogInterface arg0, int arg1) {
                                        // TODO Auto-generated method stub        
                                        etxt=(EditText)findViewById(R.id.eidt);
                                        txt=(TextView)findViewById(R.id.tv);
                                        
                                        txt.setText(etxt.getText().toString());
                                }};
                        builder2.setPositiveButton("Kill", btnListener2);
                        
                        dialog = builder2.create();
                
                }
                return dialog;
        }
    
}


main.xml
XML code

<?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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:id="@+id/tv"
    />
<Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>



dialog.xml
XML code

<?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"
    >
        <EditText android:id="@+id/eidt" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
</LinearLayout>


------解决方案--------------------
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