Question

这是我的自定义适配器。当我将此适配器与listview或gridview一起使用时，它在页面上显示列表，但不可单击。我不能与此适配器一起使用setOnItemClickListener。这段代码怎么了？请帮助...

public class CustomAdapter extends BaseAdapter {

List<Kayitlar> kayit=new ArrayList<>();
LayoutInflater li;
Context context;

public CustomAdapter(Context _context, List<Kayitlar> _kayit) {
    this.context=_context;
    this.kayit = _kayit;
}

@Override
public int getCount() {
    //listview de gösterilecek satır sayısı

    return kayit.size();
}

@Override
public Kayitlar getItem(int position) {
    // position ile sırası gelen eleman

    return kayit.get(position);
}

@Override
public int getItemViewType(int position) {
    return super.getItemViewType(position);
}

@Override
public boolean areAllItemsEnabled() {
    return super.areAllItemsEnabled();
}

@Override
public long getItemId(int position) {
    // varsa niteleyici ID bilgisi
    return position;
}



@Override
public View getView(int position, View convertView, ViewGroup parent) {
    //  position ile sırası gelen satır için bir view döndürür

    li=LayoutInflater.from(context);
    View gunler =li.inflate(R.layout.gun,null);
    TextView text1=gunler.findViewById(R.id.text1);
    TextView text2=gunler.findViewById(R.id.text2);
    TextView text3=gunler.findViewById(R.id.text3);
    TextView text4=gunler.findViewById(R.id.text4);

    Kayitlar kayitlar =kayit.get(position);
    text1.setText(kayitlar.getGun());
    text2.setText(kayitlar.getGelir_tutar());
    text3.setText(kayitlar.getGider_tutar());
    text4.setText(kayitlar.getNot_metin());
    Toast.makeText(context, "daptor tıklandı", Toast.LENGTH_SHORT).show();

    gunler.setTag(kayit.get(position).getGun());

    return gunler;
}
}

Answer 1

您只需要正确设置并实现回调即可。因此，首先要使自己成为一个界面。您可以将其嵌套在适配器类中（这是常见的做法），也可以将其分离出来，由您自己决定。对于此示例，我将其嵌套在类的底部。

注意* 我建议您使用RecyclerViews和RecyclerView.Adapter，除非您有静态列表或知道内容很小。我将提供一小部分过滤器项目的示例，其中简单的baseAdapter足以满足您的知识共享要求。

然后让我们制作一个适配器。我将分享我创建的过滤器菜单的示例。注意，ViewHolder模式可确保UI可重用，并将回调侦听器传递到位。

import android.content.Context
import android.support.v7.widget.SwitchCompat
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.LinearLayout
import android.widget.Space
import android.widget.TextView
import com.appstudio35.yourappstudio.R
import com.appstudio35.yourappstudio.models.CategoryModel
import java.util.*

/**
 * Copyright © 2017 App Studio 35. All rights reserved.
 *
 * Created by App Studio 35 on 7/3/17.
 */
class FilterListAdapter : BaseAdapter {

    ////////////////////////////////////////////////////////////////
    // MEMBERS
    ////////////////////////////////////////////////////////////////
    private var mData: ArrayList<CategoryModel>
    private var mContext: Context
    private var mActionMenuItemClickListener: IActionMenuItemClickListener?
    private var layoutInflater: LayoutInflater


    /////////////////////////////////////////////////////////////////
    // CONSTRUCTOR
    /////////////////////////////////////////////////////////////////
    constructor(context: Context, data: ArrayList<CategoryModel>, clickListener: IActionMenuItemClickListener): super(){
        mContext = context
        mData = data
        mActionMenuItemClickListener = clickListener
        layoutInflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
    }


    /////////////////////////////////////////////////////////////////
    // BASE CLASS OVERRIDES
    /////////////////////////////////////////////////////////////////
    override fun getCount(): Int {
        return mData.size
    }
    override fun getItem(position: Int): Any? {
        return mData[position]
    }
    override fun getItemId(position: Int): Long {
        return position.toLong()
    }
    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        val holder: ViewHolder
        val model = mData!![position]
        var retView: View

        if (convertView == null) {
            holder = ViewHolder()
            retView = layoutInflater.inflate(R.layout.row_filter_model_action, parent, false)

            holder.llRoot = retView.findViewById<View>(R.id.llRoot) as LinearLayout
            holder.txtDisplayText = retView.findViewById<View>(R.id.txtDisplayText) as TextView
            holder.swIsSelected = retView.findViewById<View>(R.id.swIsSelected) as SwitchCompat
            holder.spcFilter = retView.findViewById<View>(R.id.spcFilter) as Space
            holder.dividerBottom = retView.findViewById(R.id.dividerBottom)

            retView.tag = holder
        } else {
            holder = convertView.tag as ViewHolder
            retView = convertView
        }

        holder.txtDisplayText!!.text = model.getCategoryName()
        //holder.dividerBottom.setVisibility(model.getIsTitleRow() ? View.VISIBLE : View.GONE);
        holder.swIsSelected!!.visibility = View.VISIBLE
        holder.swIsSelected!!.isChecked = model.getIsFilterApplied()
        //holder.spcFilter.setVisibility(model.getIsTitleRow() ? View.GONE : View.VISIBLE);

        actionMenuItem_onClick(retView, position)

        return retView
    }


    /*///////////////////////////////////////////////////////////////
    // CLICK LISTENER
    *////////////////////////////////////////////////////////////////
    private fun actionMenuItem_onClick(convertView: View, position: Int) {
        convertView.setOnClickListener {
            mActionMenuItemClickListener?.onMenuItemClicked(convertView, position)
        }
    }


    /*///////////////////////////////////////////////////////////////
    // VIEWHOLDER PATTERN
    *////////////////////////////////////////////////////////////////
    class ViewHolder {
        var llRoot: LinearLayout? = null
        var txtDisplayText: TextView? = null
        var swIsSelected: SwitchCompat? = null
        var spcFilter: Space? = null
        var dividerBottom: View? = null
    }


    /*///////////////////////////////////////////////////////////////
    // INTERFACE
    *////////////////////////////////////////////////////////////////
    interface IActionMenuItemClickListener {
        fun onMenuItemClicked(v: View, position: Int)
    }
}

现在，您只需实现界面并捕获点击即可完成。

class myFragment : BaseFragment(), FilterListAdapter.IActionMenuItemClickListener {

现在在类中，您必须实现回调。

override fun onMenuItemClicked(v: View, position: Int) {
    //handle your clicked item
}

仅此而已，您就完成了。编码愉快。

CustomAdapter在片段中不起作用

1 个答案: