我需要在Android中动态创建的EditText领域。我已经通过链接和写按钮点击操作它。这是当我点击按钮，复选框有显示。但是，当我创建的复选​​框对象的onclick行动它显示错误。

有人能告诉我为什么会显示错误？

我的code：

 公共类InflationActivity延伸活动{

@覆盖

公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;

    滚动型SV =新的滚动型（本）;
    最后的LinearLayout LL =新的LinearLayout（本）;
    ll.setOrientation（LinearLayout.VERTICAL）;
    sv.addView（Ⅱ）;

    TextView的电视=新的TextView（本）;
    tv.setText（FTW动态布局！）;
    ll.addView（电视）;

    等的EditText =新的EditText（本）;
    et.setText（weeeeeeeeeee〜！）;
    ll.addView（等）;

    按钮B =新的按钮（这一点）;
    b.setText（我没有做任何事情，但我是动态地添加:)。）;
    ll.addView（B）;



    b.setOnClickListener（新View.OnClickListener（）{

     @覆盖
        公共无效的onClick（视图v）{
            // TODO自动生成方法存根

        的for（int i = 0;我小于20;我++）{
         复选框CH =新的复选框（本）;
         ch.setText（我动！）;

            ll.addView（CH）;
        }


        }
    }）;


    this.setContentView（SV）;

   }
 }
 

解决方案

只要你的听众变为（完美的工作，我都试过）：

  b.setOnClickListener（新OnClickListener（）{
    @覆盖
    公共无效的onClick（视图v）{
        的for（int i = 0;我小于20;我++）{
            复选框CB =新的复选框（getApplicationContext（））;
            cb.setText（我动！）;
            ll.addView（CB）;
        }
    }
}）;
 

请注意两个变化：

I need to create edittext fields dynamically in android. I have gone through the link and had written the button click action for it. That is when I click on the button the check boxes has to display. But when I am creating the checkbox object in the onclick action it is showing error.

Can someone please tell me why is it showing error?

My code :

public class InflationActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ScrollView sv = new ScrollView(this);
    final LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.VERTICAL);
    sv.addView(ll);

    TextView tv = new TextView(this);
    tv.setText("Dynamic layouts ftw!");
    ll.addView(tv);

    EditText et = new EditText(this);
    et.setText("weeeeeeeeeee~!");
    ll.addView(et);

    Button b = new Button(this);
    b.setText("I don't do anything, but I was added dynamically. :)");
    ll.addView(b);



    b.setOnClickListener(new View.OnClickListener() {

     @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

        for(int i = 0; i < 20; i++) {
         CheckBox ch = new CheckBox(this);
         ch.setText("I'm dynamic!");

            ll.addView(ch);
        }


        }
    });


    this.setContentView(sv);

   }
 }

Just change your listener to(perfectly working,I have tried):

b.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        for(int i = 0; i < 20; i++) {
            CheckBox cb = new CheckBox(getApplicationContext());
            cb.setText("I'm dynamic!");
            ll.addView(cb);
        }
    }
});

Note the two changes: