1

它工作正常，我不知道我做了什么改变，我做错了什么，它不再工作了

一切正常，正在创建表，正在插入值，甚至在日志中显示表数据，调用将转到自定义光标适配器，但我通过调试了解到的是

我的自定义光标适配器的 newView 和 Bind 视图方法未调用

  • 在调试期间，我在自定义 cursorAdapter 构造函数中看到值存在于光标中，但 newView 和 bindView 没有调用这里是 mmy 代码：

    public class DbHelper extends SQLiteOpenHelper{

private static final String dbName = "(AnnoyingAlarmDatabase).db";
private static final int version = 1;
public static final String keyId = "_id";
public static final String hour = "hour";
public static final String minute = "min";
public static final String strength = "strength";
public static final String vibrate = "vibrate";
public static final String snooze = "snooze";
public static final String method = "method";
public static final String label = "label";
public static final String days = "days";

private static final String createTable = "create table alarms (" + keyId + " integer primary key, " + label + " text, " + hour + " integer, " + minute + " integer, " + strength + " text, " + vibrate + " text, " + snooze + " integer, " + method + " text " +")";


public DbHelper(Context context) {
// TODO Auto-generated constructor stub
super(context, dbName, null, version);
Log.d("mydb", "constructor");
}

  @Override

      public void onCreate(SQLiteDatabase db) {
try{

Log.d("mydb", "oNCreate()");
db.execSQL(createTable);
}

catch( SQLException e)
{
    e.printStackTrace();
}
 }

 @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS alarms" );


    onCreate(db);

 }

      public void addAlarm( String getLabel, int getHour, int getMin, String getStrength, String getVibrate, int getSnooze, String getMethod, String getDays )
  {

           Log.d("mydb", "addAlarm");
   SQLiteDatabase db = this.getWritableDatabase();
   ContentValues values = new ContentValues();

   values.put( label , getLabel);
   values.put( hour , getHour);
values.put( minute , getMin);
values.put( strength , getStrength);
values.put( vibrate , getVibrate);
values.put( snooze , getSnooze);
values.put( method , getMethod);

db.insert("alarms", null, values);

db.close();


   }

      public Cursor getAlarm( )
  {

          Log.d("mydb", "getAlarm");


SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery("select * from alarms", null);

try{
    while( cursor.moveToNext())
    {
        Log.d("db id", cursor.getString(0));
        Log.d("db label",cursor.getString(1));
        Log.d("db hour",cursor.getString(2));
        Log.d("db minute",cursor.getString(3));
        Log.d("db strength",cursor.getString(4));
        Log.d("db vibrate",cursor.getString(5));
        Log.d("db snooze",cursor.getString(6));
        Log.d("db method",cursor.getString(7));
        //Log.d("db days",cursor.getString(8));
    }

}

catch( SQLException e )
{
    e.printStackTrace();
}

finally{
//  cursor.close();
    db.close();
}

cursor.moveToFirst();

//db.close();
  return cursor;
    }

活动：

     public class ViewAlarms extends ListActivity {

Cursor cursor;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    DbHelper db = new DbHelper(this);

    cursor = db.getAlarm();
String [] from = {DbHelper.label};
    int [] to = {R.id.textViewLabel};


//  SimpleCursorAdapter adapter =  new SimpleCursorAdapter(this, R.layout.row_view, cursor, from, to);
//  setListAdapter(adapter);


    CustomCursorAdapter adapter = new CustomCursorAdapter(this, cursor);
    setListAdapter(adapter);
    cursor.close();

}

自定义光标适配器

public class CustomCursorAdapter extends CursorAdapter {

    private LayoutInflater inflator;
    private int hourIndex;
    private int minIndex;
    private int labelIndex;


    public CustomCursorAdapter(Context context, Cursor c) {
        super(context, c);
        inflator = LayoutInflater.from(context);
        hourIndex = c.getColumnIndex(DbHelper.hour);
        minIndex = c.getColumnIndex(DbHelper.minute);
        labelIndex = c.getColumnIndex(DbHelper.label);
        Log.d("customAdapter", "constructor");
        //Log.d("adapter curconst",c.getString(minIndex));
        }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {

        TextView label = (TextView)view.findViewById(R.id.textViewLabel);
        TextView time = (TextView)view.findViewById(R.id.textViewTIme);
        Log.d("adapter cursor","chala?");

    //time
        int hour = Integer.parseInt(cursor.getString(hourIndex));
        int min = Integer.parseInt(cursor.getString(minIndex));
        String minStr;

        if ( min < 10 )
        {
            minStr = "0" + min;
        }
        else
        {
            minStr = "" + min;
        }
        if ( hour < 12 )
        {
            if ( hour == 0 )
                hour = 12;
            time.setText(hour + ":" + minStr + " Am");
        }

        if ( hour > 12 )
        {
            if ( hour == 0 )
                hour = 12;
            time.setText(hour % 12 + ":" + minStr + " Pm");
        }

        //label
        label.setText(cursor.getString(labelIndex));
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup arg2) {
        Log.d("newView","chala");
        return inflator.inflate(R.layout.row_view, arg2, false);
    }

}

即使我尝试了简单的光标适配器，它仍然没有显示任何内容。

4

1 回答 1

4

您正在使用的构造函数已被弃用。您应该使用加载器。 这是更多文档

试图回答你的问题。您是否尝试在调用 setAdapter() 后立即删除 cursor.close() 行。当您的适配器仍然需要它时，您可能正在关闭光标。这也可以通过使用 Loader 来解决，因为它可以更好地为您处理生命周期事件。

于 2012-08-05T00:11:37.837 回答