Question

我已经看到了其他类似的问题，但没有任何解决问题。我的问题是Checkboxes和CheckedTextViews从我的列表中随机消失。也就是说，它们是第一次加载ListView，以及第一次滚动到底部。任何随机滚动都会导致CheckBoxes退出并消失。

以下是我的扩展SimpleCursorAdapter的代码。

public class CheckBoxCursorAdapter extends SimpleCursorAdapter{
    static final String TAG = "CheckBoxCursorAdapter";
    final Context contextMain;
    Cursor c;
    SQLiteDatabase db;

    public CheckBoxCursorAdapter(Context context, int layout, Cursor c,
            String[] from, int[] to, SQLiteDatabase db) {
        super(context, layout, c, from, to);
        this.contextMain = context;
        this.c = c;
        this.db = db;
    }

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

            CheckedTextView cb = (CheckedTextView)view.findViewById(R.id.cb);
            cb.setOnClickListener(null);
            TextView cbFull = (TextView)view.findViewById(R.id.fullname);
            TextView cbAbbrev = (TextView)view.findViewById(R.id.abbrev);

            cb.setCheckMarkDrawable(android.R.drawable.btn_default);

            final String abbrv = cursor.getString(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_ABBRV));

            cbFull.setText(cursor.getString(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_NAME)));
            cbAbbrev.setText(abbrv);
            cb.setChecked(cursor.getInt(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_DISPLAYED)) == 1 ? true : false);

            Log.v(TAG, "displayed = " + Long.toString(cursor.getInt(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_DISPLAYED))));


            cb.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(((CheckedTextView) v).isChecked()) {                    
                        Log.v(TAG, "Calling isChecked==true!");
                        db.execSQL("UPDATE buildinglist SET displayed='1' WHERE abbrv='"+ abbrv +"'");
                        ((CheckedTextView) v).setChecked(true);
                     }
                     else  {
                         Log.v(TAG, "Calling isChecked==false!");
                         db.execSQL("UPDATE buildinglist SET displayed='0' WHERE abbrv='"+ abbrv +"'");
                         //(CheckedTextView) v).setChecked(false);
                         ((CheckedTextView) v).setChecked(false);
                     }
                }           
            });

            final int latitude = cursor.getInt(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_YCOORD));
            final int longitude = cursor.getInt(cursor.getColumnIndexOrThrow(BuildingOpenHelper.C_XCOORD));

            view.setOnLongClickListener(new OnLongClickListener() {    
                @Override
                public boolean onLongClick(View v) {
                 //   Log.v(TAG, "Calling isChecked==true!");
                  //  db.execSQL("UPDATE buildinglist SET displayed='1' WHERE abbrv='"+ abbrv +"'");
                   // ((CheckedTextView) v).setChecked(true);

                    Intent i = new Intent(contextMain,View_map.class);
                    i.putExtra("lat", latitude);
                    i.putExtra("long", longitude);
                    Log.d(TAG,"Latitude onLongClick" + latitude + "");
                    Log.d(TAG,"Longitude onLongClick" + longitude +"");

                    contextMain.startActivity(i);
                    return false;
                } 
            });
    }
}

我正在使用ListActivity，这是启动。

public class Buildings_List extends ListActivity{
    BuildingOpenHelper opener;
    SQLiteDatabase db;
    SQLiteDatabase dbWrite;
    static final String[] FROM = {BuildingOpenHelper.C_NAME, BuildingOpenHelper.C_ABBRV, BuildingOpenHelper.C_DISPLAYED};
    static final int[] TO = { R.id.fullname, R.id.abbrev, R.id.cb };
    private static final String TAG = "Buildings_List";
    SimpleCursorAdapter adapt;
    Cursor myCur = null;
    Bundle savedInstanceState2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        savedInstanceState2 = savedInstanceState;   
        super.onCreate(savedInstanceState2);
        ListView awesome = getListView();


        opener = new BuildingOpenHelper(this);
        db = opener.getReadableDatabase();
        dbWrite = opener.getWritableDatabase();


        try {
         myCur = db.query(BuildingOpenHelper.TABLE,null,null,null,null,null,BuildingOpenHelper._ID + " DESC");
        }
        catch(SQLException e){
            Log.d(TAG,"Query Went Bad");
        }
        startManagingCursor(myCur);

        //using depracated SimpleCursorAdapter. Not quite sure what the flags need to be when using updated constructor
        adapt = new CheckBoxCursorAdapter(this, R.layout.buildinglisting, myCur, FROM, TO, dbWrite);

        setListAdapter(adapt);


    }

我知道onClickListeners不是问题，因为我已经尝试删除它们，问题仍然存在。我已经阅读了CheckBoxes的多个帐户没有正确回收，但问题仍然存在于CheckTextViews。我错过了一些非常简单的事情吗？

Answer 1

因为listview重用了行。您可以参考我的类似问题：scrolling listview causes buttons to be invisible

Android ListView导致CheckBoxes和CheckedTextViews消失

1 个答案: