问安卓:使用SimpleCursorAdapter从数据库获取数据到ListView

EN

import java.util.Calendar;

import maturarbeit.nicola_pfister.studenttools.database.DBAdapter;
import android.app.AlertDialog.Builder;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ListView;


public class Marks extends ListActivity {

DBAdapter db = new DBAdapter(this);

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

@Override
protected void onPause() {
    super.onPause();
    db.close();
}

@Override
protected void onResume() {
    super.onResume();
    db.open();

    getData();
}

@SuppressWarnings("deprecation")
private void getData() {
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, 
            android.R.layout.simple_list_item_1, 
            db.getAllMarks(), 
            new String[] { "value" }, 
            new int[] { android.R.id.text1 });

    ListView listView = (ListView) findViewById(R.id.marks_list);
    listView.setAdapter(adapter);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.marks, menu);
    return true;
}

public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.menu_add:
        Calendar cal = Calendar.getInstance();
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int month = cal.get(Calendar.MONTH);
        final String date = day + "." + month;
        Builder builder = new Builder(this);
        builder
            .setTitle(R.string.dialog_addmarks)
            .setItems(R.array.markslist, new OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    @SuppressWarnings("unused")
                    long id;
                    String selection = getResources().getStringArray(R.array.markslist)[which];
                    id = db.insertMark(date, "Default", selection);
                    }
            })
            .show();
        getData();
        break;
    case R.id.menu_delete:
            //Deleting function yet to be implemented.
        break;
    }
    return super.onOptionsItemSelected(item);
}
}