我是android編程中的一個begginer,並且還遇到了另一個問題。我正在製作一個簡單的微調應用程序。這是代碼。類型new AdapterView.OnItemSelectedListener(){}必須實現繼承的抽象方法錯誤。 Eclipse
package net.learn2develop.Basicviews6;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
public class BasicViews6Activity extends Activity {
String[] presidents;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
presidents =
getResources().getStringArray(R.array.presidents_array);
Spinner s1 = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, presidents);
s1.setAdapter(adapter);
s1.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0,
View arg1, int arg2, long arg3)
{
int index = arg0.getSelectedItemPosition();
Toast.makeText(getBaseContext(),
"You have selected item : " + presidents[index],
Toast.LENGTH_SHORT).show();
}
@Override
public Void onNothingdSelected(AdapterView<?> arg0) { }
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.basic_views6, menu);
return true;
}
}
,但它不會讓我跑,因爲論文的代碼行:
s1.setOnItemSelectedListener(new OnItemSelectedListener()
public Void onNothingdSelected(AdapterView<?> arg0)
具有讀取錯誤:
類型新AdapterView.OnItemSelectedListener(){}必須實現繼承抽象方法AdapterView.OnItemSelectedListener.onNothingSelected(AdapterView)
有人能給我啓發嗎?任何幫助都感激不盡!
呃。我總是會犯這些語法錯誤。非常感謝你的幫助 – 2013-04-25 00:28:21