Question

我有一个MainActivity，CustomListAdapter，customlistItem.xml，mainlayout.xml。

我的ListView包含一个可编辑的EditText。

我正在尝试

如果editText中的文字被更改，
数据库更新，listView（listItem）更新。

customListAdapter：

public class subMyListAdapter extends BaseAdapter{

Context context;
LayoutInflater Inflater;
ArrayList<subMyItem> arraySrc;
int layout;
EditText tvItem;
UserHolder holder;
myDBHelper myHelper;
public subMyListAdapter(Context context, int layout, ArrayList<subMyItem> arraySrc, myDBHelper myHelper)
{
    this.context = context;
    this.layout = layout;
    this.arraySrc = arraySrc;
    Inflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
    myHelper = this.myHelper;
}


public int getCount()
{
    return arraySrc.size();
}

public String getItem(int position)
{
    return arraySrc.get(position).list;
}

public long getItemId(int position)
{
    return position;
}



public View getView(final int position, View conv, ViewGroup parent)
{
    holder = null;

     if (conv == null) 
     {
       LayoutInflater inflater = ((Activity) context).getLayoutInflater();
       conv = inflater.inflate(layout, parent, false);
       holder = new UserHolder();
       holder.tvItem = (EditText)conv.findViewById(R.id.tvItem);
       conv.setTag(holder);
     }
     else 
     {
       holder = (UserHolder) conv.getTag();
     }

     if(holder == null)
     {
       holder = new UserHolder();
       holder.tvItem = (EditText)conv.findViewById(R.id.tvItem);
       conv.setTag(holder);
     }

     subMyItem user = arraySrc.get(position);
     holder.tvItem.setOnTouchListener(test);
     holder.tvItem.setTag(position);
     conv.setOnTouchListener(test);

    TextView count = (TextView)conv.findViewById(R.id.tvItemCount);
    count.setText(String.valueOf(arraySrc.size()));
    FrameLayout bg = (FrameLayout)conv.findViewById(R.id.bg);


    EditText tvItem = (EditText) conv.findViewById(R.id.tvItem);
    user = arraySrc.get(position);
    if(!tvItem.getText().toString().equals(user.list))
      tvItem.setText(user.list);
    tvItem.setTag(position);

    TextWatchert at = new TextWatchert();
    at.sqlId=user.id;
    at.position=position;

    tvItem.addTextChangedListener(at);
    return conv;
}

class TextWatchert implements TextWatcher
{
    int sqlId;
    int position;

    @Override
    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub
        if(openPositon != position)return;

        myHelper = new myDBHelper(context);
        SQLiteDatabase sqlDB = myHelper.getWritableDatabase();
        String update = "UPDATE clearTBL SET list='" + tvItem.getText().toString()+ "' WHERE id=" + sqlId + ";";
        try
        {
        sqlDB.execSQL(update);
        }
        catch (Exception e)
        {
          e.printStackTrace();
        }

        sqlDB.close();
        myListActivity.arrItem.get(position).list = s.toString();
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {

    }
    @Override
    public void onTextChanged(CharSequence s, int start, int before,
            int count) {

    }

}

int openPositon = -1;

View.OnTouchListener test=  new View.OnTouchListener() 
{
    @Override
    public boolean onTouch(View view, MotionEvent event) 
    {
        if (view instanceof EditText) 
        {
            tvItem = (EditText) view;
            tvItem.setFocusable(true);
            tvItem.setFocusableInTouchMode(true);
            try
            {
                openPositon = Integer.parseInt(tvItem.getTag().toString()); 
            }
            catch
            (Exception e)
            {}

        } else 
        {
            hideSoftKeyboard();
            view.requestFocus();
            UserHolder holder = (UserHolder) view.getTag();
            holder.tvItem.clearFocus();
            holder.tvItem.setMovementMethod(null);
            holder.tvItem.setFocusable(false);
            holder.tvItem.setFocusableInTouchMode(false);
            openPositon=-1;
        }
    return false;
    }
};
public void hideSoftKeyboard()
{
    InputMethodManager imm = (InputMethodManager)context.getSystemService(context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(((Activity)context).getCurrentFocus().getWindowToken(), 0);
}
 static class UserHolder 
 {
      EditText tvItem;
     }

}

我的代码工作正常。但是当我尝试编辑时，它太慢了，落后太多了。滚动，触摸就可以了。只需编辑就需要很长时间。

我认为addTextChangedListener代码存在问题。

我如何减少滞后？

修改

好的，新代码是

View.OnTouchListener test=  new View.OnTouchListener() 
{
    @Override
    public boolean onTouch(View view, MotionEvent event) 
    {
        if (view instanceof EditText) 
        {
             tVibrator = (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
             tVibrator.vibrate(50);
            tvItem = (EditText) view;
            tvItem.setFocusable(true);
            tvItem.setFocusableInTouchMode(true);
            try
            {
                openPositon = Integer.parseInt(tvItem.getTag().toString()); 
            }
            catch
            (Exception e)
            {}

        } else 
        {
            hideSoftKeyboard();
            view.requestFocus();
            UserHolder holder = (UserHolder) view.getTag();
            holder.tvItem.clearFocus();
            holder.tvItem.setMovementMethod(null);
            holder.tvItem.setFocusable(false);
            holder.tvItem.setFocusableInTouchMode(false);
            openPositon=-1;

            try
            {
                sPosition = tvItem.getTag().toString(); 
            }
            catch
            (Exception e)
            {}
            if(sPosition!=null)
            {
                int pos = Integer.parseInt(sPosition);
                myHelper = new myDBHelper(context);
                SQLiteDatabase sqlDB = myHelper.getWritableDatabase();
                subMyItem user = arraySrc.get(pos);
                int a = user.id;
                String update = "UPDATE clearTBL SET list='" + tvItem.getText().toString()+ "' WHERE id=" + a + ";";
                try
                {
                    sqlDB.execSQL(update);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }

                sqlDB.close();

                myListActivity.arrItem.get(pos).list = tvItem.toString();
            }
        }
    return false;
    }
};

现在所有代码都运行正常。谢谢大家！

Answer 1

您应该只在完成文本字段编辑后更新数据库。每当您进行文本更改时，您都会更新它。删除TextWatcher并在您对编辑感到满意后，将SQL移动到可以手动触发的位置。

我的listView非常落后

1 个答案: