setListAdapter（）不起作用

Question

import android.app.Activity;
import android.os.Bundle;
import android.app.ListActivity;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract;
import android.widget.SimpleCursorAdapter;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Uri allContacts = Uri.parse("content://contacts/people");
            Cursor c = managedQuery(allContacts, null, null, null, null);
            String[] columns = new String[] {
            ContactsContract.Contacts.DISPLAY_NAME,
            ContactsContract.Contacts._ID};
            int[] views = new int[] {R.id.contactName, R.id.contactID};
            SimpleCursorAdapter adapter =
            new SimpleCursorAdapter(this, R.layout.activity_main, c, columns,views);    
            this.setListAdapter(adapter);
    }

}

它總是顯示此錯誤：方法MainList類型未定義setListAdapter（SimpleCursorAdapter）

Answer 1

為了使用setListAdapter您的類必須擴展ListActivity而不是Activity 。 更改

public class MainActivity extends Activity

同

public class MainActivity extends ListActivity 

Answer 2

更改通過擴展ListActivity擴展了Activity之后，如果問題還沒有解決，您可以嘗試進行Change：

import android.widget.SimpleCursorAdapter;

有：

import android.support.v4.widget.SimpleCursorAdapter;