使用到纺纱，应用程序工作正常，但会显示在单击按钮时错误 [英] Using to spinners, app works fine, but when the button is clicked error is displayed

问题描述

在这里; S编码

 ＆LT;按钮
        机器人：ID =@ + ID / CONV
        机器人：layout_width =150dp
        机器人：layout_height =70dp
        机器人：layout_alignParentTop =真
        机器人：layout_centerHorizo​​ntal =真
        机器人：layout_marginTop =76dp
        机器人：文字=转换
        安卓的onClick =的onCreate/＆GT;
 

---

 公共类LstActivity延伸活动{的EditText等;
TextView的电视;
按钮B1;
/ **当第一次创建活动调用。 * /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;
    等=（EditText上）findViewById（R.id.editText1）; 微调微调=（微调）findViewById（R.id.spinner1）;
 微调S2 =（微调）findViewById（R.id.spinner2）;
 ArrayAdapter＆LT;＆GT;适配器= ArrayAdapter.createFromResource（这一点，R.array.weight，android.R.layout.simple_spinner_item）;
 adapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
 spinner.setAdapter（适配器）;
  spinner.setOnItemSelectedListener（新myaction（））;
  电视=（的TextView）findViewById（R.id.textView3）;  ArrayAdapter＆LT;＆GT;适配器1 = ArrayAdapter.createFromResource（这一点，R.array.weight，android.R.layout.simple_spinner_item）;
  adapter1.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
  s2.setAdapter（适配器1）;
   s2.setOnItemSelectedListener（新myaction2（））;
   B1 =（按钮）findViewById（R.id.conv）;
   et.setText（0）;
   浮X =（Float.parseFloat（将String.valueOf（et.getText（））））;   如果（（spinner.getSelectedItemPosition（）== 2）及及（（s2.getSelectedItemPosition（）== 1）））
   {       tv.setText（将String.valueOf（gmtomilli（X）+毫克））;
   }
   }
 

该应用程序启动正常，但单击按钮时，显示下面的错误。

  15 06-21：48：46.509：E / AndroidRuntime（2260）：java.lang.IllegalStateException：找不到在活动课kk.and方法的onCreate（视图） .LstActivity对视图类android.widget.Button的onClick处理程序ID为CONV
 

解决方案

拓展上萨米尔的回答（修改安卓的onClick =的onCreate到安卓的onClick =btnclick）与code向您展示如何使其工作：

 公共类LstActivity延伸活动{    的EditText等;
    TextView的电视;
    按钮B1;
    微调微调;
    微调S2;
    浮X;    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;        微调=（微调）findViewById（R.id.spinner1）;
        S2 =（微调）findViewById（R.id.spinner2）;        //你的另一code        X =（Float.parseFloat（将String.valueOf（et.getText（））））;    }    公共无效btnclick（视图v）{
          如果（（spinner.getSelectedItemPosition（）== 2）及及（（s2.getSelectedItemPosition（）== 1）））{
            tv.setText（将String.valueOf（gmtomilli（X）+毫克））;
          }
    }
}
 

here;s the coding

  <Button
        android:id="@+id/conv"
        android:layout_width="150dp"
        android:layout_height="70dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="76dp"
        android:text="Convert" 
        android:onClick="onCreate"/>

---

public class LstActivity extends Activity {

EditText et;
TextView tv;
Button b1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState ) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    et=(EditText)findViewById(R.id.editText1);

 Spinner spinner=(Spinner)findViewById(R.id.spinner1);
 Spinner s2=(Spinner)findViewById(R.id.spinner2);


 ArrayAdapter<?> adapter=ArrayAdapter.createFromResource(this, R.array.weight, android.R.layout.simple_spinner_item);
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 spinner.setAdapter(adapter);    
  spinner.setOnItemSelectedListener(new myaction());


  tv=(TextView)findViewById(R.id.textView3);

  ArrayAdapter<?> adapter1=ArrayAdapter.createFromResource(this, R.array.weight, android.R.layout.simple_spinner_item);
  adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  s2.setAdapter(adapter1);    
   s2.setOnItemSelectedListener(new myaction2());
   b1=(Button)findViewById(R.id.conv);
   et.setText("0");


   float x=(Float.parseFloat(String.valueOf(et.getText())));





   if ((spinner.getSelectedItemPosition()==2) && ((s2.getSelectedItemPosition()==1)))
   {

       tv.setText(String.valueOf(gmtomilli(x)+"mg"));
   }


   }

The app starts fine, but when the button is clicked, the following error is shown.

06-21 15:48:46.509: E/AndroidRuntime(2260): java.lang.IllegalStateException: Could not find a method onCreate(View) in the activity class kk.and.LstActivity for onClick handler on view class android.widget.Button with id 'conv'

解决方案

Expanding on Samir's answer (change the android:onClick="onCreate" to android:onClick="btnclick") with code showing you how to make it work:

public class LstActivity extends Activity {   

    EditText et;   
    TextView tv;   
    Button b1;   
    Spinner spinner;
    Spinner s2;
    float x;

    @Override  
    public void onCreate(Bundle savedInstanceState ) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  

        spinner=(Spinner)findViewById(R.id.spinner1);      
        s2=(Spinner)findViewById(R.id.spinner2);     

        // your other code

        x=(Float.parseFloat(String.valueOf(et.getText())));           

    } 

    public void btnclick(View v){       
          if ((spinner.getSelectedItemPosition()==2) && ((s2.getSelectedItemPosition()==1))) {            
            tv.setText(String.valueOf(gmtomilli(x)+"mg"));            
          }     
    }   
}

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