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添加自定义view出现空指针异常

2012-02-02 01:08 507 查看 
代码片段：
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View scenemode = inflater.inflate(R.layout.scenemode, null);
new AlertDialog.Builder(MyGridView.this)
.setTitle("情景模式设置")
.setView(scenemode)
.setPositiveButton("ok", null)
.setNegativeButton("cancle", null)
.show();
/*为RadioGroup添加监听事件*/
final RadioButton rb1 = (RadioButton)findViewById(R.id.rb1);
final RadioButton rb2 = (RadioButton)findViewById(R.id.rb2);
final RadioButton rb3 = (RadioButton)findViewById(R.id.rb3);
final RadioButton rb4 = (RadioButton).findViewById(R.id.rb4);
final TextView tv = (TextView)findViewById(R.id.tv);
RadioGroup rg = (RadioGroup)scenemode.findViewById(R.id.rg);
rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if(checkedId == rb1.getId())
{


老是报空指针异常，最后发现原来是要
final RadioButton rb1 = (RadioButton)findViewById(R.id.rb1);改为final RadioButton rb1 = (RadioButton)scenemode.findViewById(R.id.rb1);
以下的几个控件都要改


                                            

                                        

                        
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