在alertDialog中使用微调器时出现空指针异常

Question

这是我写的代码:

// create a view in dialog box
final View fileView = getLayoutInflater().inflate(R.layout.filename, null);
String[] array_spinner = new String[5];
array_spinner[0]="1";
array_spinner[1]="2";
array_spinner[2]="3";
array_spinner[3]="4";
array_spinner[4]="5";

Spinner s = (Spinner) findViewById(R.id.sp_CAT);
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_spinner_item, array_spinner);
s.setAdapter(adapter);
s.setSelection(2);

//Spinner mCAT = (Spinner) findViewById(R.id.sp_CAT);
//ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
//fileView.getContext(), R.array.a_CAT, android.R.layout.simple_spinner_item);
//adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//mCAT.setAdapter(adapter);

EditText mSID = (EditText) fileView.findViewById(R.id.et_SID);
EditText mSCD = (EditText) fileView.findViewById(R.id.et_SCD);
EditText mNUM = (EditText) fileView.findViewById(R.id.et_NUM);
final String tSID=mSID.getText().toString();
final String tSCD=mSCD.getText().toString();
final String tNUM=mNUM.getText().toString();

// show dialog box
new AlertDialog.Builder(CameraActivity3.this).setTitle("Set FileName")
  .setView(fileView)
  .setPositiveButton("OK", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {

      Toast.makeText(CameraActivity3.this, tSID+tSCD+tNUM, Toast.LENGTH_SHORT).show();

    }// public void onClick
  }) // setPositiveButton
  .setNegativeButton("Cancel", null).show();

但是,我收到一个空指针异常.经过一些测试(注释掉一些行),它似乎与微调器适配器有关.我弄错了吗？

Answer 1

用这个:

Spinner s = (Spinner) fileView.findViewById(R.id.sp_CAT);