Edittext空指針異常

我無法從EditText獲取文本。該EditText位於名爲可選的Costum對話框中。我認爲這與觀點有關，但仍然無法解決。Edittext空指針異常

謝謝你的幫助。

主要活動

public class MainActivity extends Activity { 

    Button button = (Button) findViewById(R.id.comments); 
    button.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 

      // custom dialog 
      final Dialog dialog = new Dialog(MainActivity.this); 

      dialog.setTitle("Comentários"); 

      dialog.setContentView(R.layout.optional); 

      final EditText editTextName = (EditText) arg0.findViewById(R.id.editTextName); 
      final EditText editTextEmail = (EditText) arg0.findViewById(R.id.editTextEmail); 
      final EditText editTextCompany = (EditText) arg0.findViewById(R.id.editTextCompany); 

      Button cancel = (Button) dialog.findViewById(R.id.cancel); 
      cancel.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 

        dialog.dismiss(); 

       } 
      }); 

      Button submit = (Button) dialog.findViewById(R.id.submit); 
      submit.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        //Null pointer exception 
        name = editTextName.getText().toString(); 
        email = editTextEmail.getText().toString(); 
        company = editTextCompany.getText().toString(); 

        dialog.dismiss(); 
       } 
      }); 

      dialog.show(); 
     } 
    }); 
}

}

optional.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/container" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@drawable/background" 
tools:context="com.example.isqsurvey.MainActivity" > 

<EditText 
    android:id="@+id/editTextName" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/textViewName" 
    android:ems="10" 
    android:inputType="textPersonName" /> 

<EditText 
    android:id="@+id/editTextEmail" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/textViewEmail" 
    android:ems="10" 
    android:inputType="textEmailAddress" /> 

<EditText 
    android:id="@+id/editTextCompany" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/textViewCompany" 
    android:ems="10" /> 

<Button 
    android:id="@+id/cancel" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/submit" 
    android:layout_alignBottom="@+id/submit" 
    android:layout_alignParentLeft="true" 
    android:text="@string/cancel" /> 

<Button 
    android:id="@+id/submit" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentRight="true" 
    android:text="@string/submit" />

來源

2014-07-10 JorgeSilva

更改所有的初始化到

final EditText editTextName = (EditText) dialog.findViewById(R.id.editTextName); 
final EditText editTextEmail = (EditText) dialog.findViewById(R.id.editTextEmail); 
final EditText editTextCompany = (EditText) dialog.findViewById(R.id.editTextCompany);

這是因爲意見屬於對話框佈局optional.xml

來源

2014-07-10 11:33:40 Raghunandan

是的，你是對的。謝謝:) – JorgeSilva

@JorgeSilva歡迎您。您可以通過點擊旁邊的勾號來接受答案 – Raghunandan

Edittext空指針異常

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