Question

我已经创建了一个接收器，它接收从SQLite数据库加载到Listview的Cursor和Context。以下是我传递Cursor的方法：

    aCursor = mDb.rawQuery("SELECT * FROM Chat", null);
    aCursor.moveToFirst();
    adapter = new ChatAdapter(this,aCursor);

在这里我的适配器：

public ChatAdapter(Context context,Cursor allentries) {
    this.mContext = context;
    this.mCursor=allentries;

        //  BusProvider.getInstance().register(this);

    mCursor.moveToFirst();

    mLayoutInflater = (LayoutInflater) 
    mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return mCursor.getCount();
}

@Override
public Object getItem(int position) {
    return mCursor.getString(position);
}

@Override
public long getItemId(int position) {
    return mCursor.getPosition();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    if (row == null) {
        LayoutInflater inflater = (LayoutInflater)this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.listitem_discuss, parent, false);
    }


    wrapper = (LinearLayout) row.findViewById(R.id.wrapper);

    theMessage = (TextView) row.findViewById(R.id.comment);
    theName = (TextView) row.findViewById(R.id.MSGname);
    theImage = (ImageView)row.findViewById(R.id.MSGimage);

    android.widget.FrameLayout.LayoutParams lp = 
        (android.widget.FrameLayout.LayoutParams) theName.getLayoutParams();

    String Namer= mCursor.getString(mCursor.getColumnIndex("username"));
    String namer[] = Namer.split("\\@");
    String imagenamer=namer[0];

    theName.setText(imagenamer);
    theMessage.setText(mCursor.getString(mCursor.getColumnIndex("message")));

    int isright=Integer.valueOf(mCursor.getString(mCursor.getColumnIndex("isright")));

    if(isright==0){

        theMessage.setBackgroundResource(R.drawable.bubble_yellow);
        //theMessage.setBackgroundResource(isright==0 ? R.drawable.bubble_yellow : R.drawable.bubble_green);
        wrapper.setGravity(Gravity.LEFT);
        //wrapper.setGravity(isright==0 ? Gravity.LEFT : Gravity.RIGHT);
        lp.gravity = Gravity.LEFT;
        theName.setLayoutParams(lp);

        android.widget.FrameLayout.LayoutParams params = new android.widget.FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,Gravity.LEFT);
        theImage.setLayoutParams(params);

        theImage.setPadding(10,0,0,0);
        wrapper.setPadding( ImageWidth+10,40,0, 0);
        theName.setPadding( ImageWidth+25, 0,0, 0);
        //(left, top, right, bottom)
        File file= new File("storage/sdcard/LifeMatePrivate/ProfileImage/ProfileImage,imagechange_2,"+imagenamer+",.jpg");
        if(file.exists()){
            Picasso.with(mContext).load(new File("storage/sdcard/LifeMatePrivate/ProfileImage/ProfileImage,imagechange_2,"+imagenamer+",.jpg")).resize(ImageWidth,ImageHeight).centerCrop().into(theImage);
        }else{
            Picasso.with(mContext).load(new File("storage/sdcard/LifeMatePrivate/ProfileImage/Default.jpg")).resize(ImageWidth,ImageHeight).centerCrop().into(theImage);
        }
    }
}

一切都很好，但是当我调用adapter.NotifyDatasetChanged时，它返回索引-1请求大小为21，这意味着我还没有初始化我的Cursor。但根据我的理解，没有必要调用movetofirst（）。但也许我错了。你能帮帮我吗？

光标，索引-1请求大小为多

0 个答案: