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如何访问RecyclerView中TextView中显示的字符串(使用光标)?

adapter cursor android

Jeff · 技术社区 · 7 年前

由于pskink在回答下面的评论,我编写了直接使用光标的代码 Populate recyclerview with a SQLite database? OnClickListener for RecyclerView 问题)和实验我发现,将setOnClickListener()移动到ViewHolder并添加onClick()作为其方法,我可以访问TextView,但无法获得字符串值。

mCursor已初始化:

public SelectPetNameAdapter(Context context, Cursor cursor) {
    this.mContext = context;
    mCursor = cursor;
    //TEST: the following is here to verify that the Cursor is passed to this class. It is.
    int cnt = getItemCount();
    Log.d("Cursor count is", " " + cnt);
}

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public TextView tvName;
    public View mView;

    public ViewHolder(View itemView) {
        super(itemView);
        Log.d("Instantiating", "ViewHolder");
        itemView.setOnClickListener(this);
        tvName = (TextView) itemView.findViewById(R.id.petname);
        mView = itemView;
    }

        @Override
        public void onClick(View v){
            Log.d("Entered", "onClick in ViewHolder");
            int mPosition = getLayoutPosition();
            String name = mCursor.getString(0);
            int rowId = mCursor.getPosition();
            Intent intent = new Intent(mContext, PetInformationActivity.class);
            long holderId = itemView.getId();
            String holderName = itemView.toString();
            int viewId = v.getId();
            mCursor.moveToPosition(mPosition);

            Log.d("Entered", "setOnClickListener in SelectPetNameAdapter");
            Log.d("holderId is", " " + holderId);
            Log.d("holderName is", " " + holderName);
            Log.d("viewId is", " " + viewId);
            Log.d("position is", " " + mPosition);
            Log.d("Pet ID is", " " + rowId);
            Log.d("Pet name is", " " + name);
            Bundle extras = new Bundle();
            extras.putString(NAME_KEY, name);
            intent.putExtras(extras);
            mContext.startActivity(intent);
        }
    }

虽然这确实提供了对TextView字符串的访问,但显示的名称与单击的TextView不同步。如下所示 LOGCAT公司 位置:2 是单击的TextView的位置,但 宠物ID:0 和 宠物名:qwerty 是单击的TextView和 宠物ID:2 宠物名:fert 是上一次单击的光标值!

LOGCAT公司

Entered: onClick in ViewHolder
Entered: setOnClickListener in SelectPetNameAdapter
holderIdÂ is:  2131558581
holderNameÂ is:  android.support.v7.widget.AppCompatTextView{b3adb53 V.ED..C.. ...P.... 0,98-1056,147 #7f0d00b5 app:id/petname}
viewIdÂ is:  2131558581
PositionÂ is:  2
PetÂ IDÂ is:  0
PetÂ nameÂ is:  qwerty
Entered: onCreate in PetInformatioActivity
petNameÂ (fromÂ Bundle)Â is:  qwerty
IdÂ (fromÂ Bundle)Â is:  null

Entered: onClick in ViewHolder
Entered: setOnClickListener in SelectPetNameAdapter
holderIdÂ is:  2131558581
holderNameÂ is:  android.support.v7.widget.AppCompatTextView{45fe03c V.ED..C.. ...P.... 0,392-1056,441 #7f0d00b5 app:id/petname}
viewIdÂ is:  2131558581
PositionÂ is:  8
PetÂ IDÂ is:  2
PetÂ nameÂ is:  fert
Entered: onCreate in PetInformatioActivity
petNameÂ (fromÂ Bundle)Â is:  fert
IdÂ (fromÂ Bundle)Â is:  null

但是,虽然当前单击的位置正确,但如何访问已单击文本视图中的字符串,而不是光标中的上一个字符串?

1 回复 | 直到 7 年前

Jeff 7 年前

我相信我已经找到了在使用光标时获取单击的TextView字符串的解决方案。它确实如中所述 OnClickListener for RecyclerView :

项目视图。setOnClickListener(this); )
int mPosition=getLayoutPosition(); ).
在麦库索。moveToPosition(mPosition); ).

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public TextView tvName;
    public View mView;

    public ViewHolder(View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        tvName = (TextView) itemView.findViewById(R.id.petname);
        mView = itemView;
    }

        @Override
        public void onClick(View v){
            int mPosition = getLayoutPosition();
            mCursor.moveToPosition(mPosition);
            String name = mCursor.getString(0);
            Intent intent = new Intent(mContext, PetInformationActivity.class);

            Bundle extras = new Bundle();
            extras.putString(NAME_KEY, name);
            intent.putExtras(extras);
            mContext.startActivity(intent);
        }
    }