适配器中第二个元素的位置错误

Question

我有一个自定义适配器，单击时，所有返回的位置都是正确的，除了第二个，它应该是 1 但实际上是 0（与第一个元素相同）。我尝试使用 v.getTag() 而不是直接使用位置，但它仍然给我相同的结果。适配器的一些背景知识：我的 ConnectedDeviceActivity 向适配器发送 "All"、"No Connected Device" 或设备名称。根据点击的项目，它调用 AnalysisActivity，显示与点击项目相关的数据图表。这是我的代码：

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class AnalysisAdapter extends ArrayAdapter{

    private List appliance = new ArrayList<>();
    private List animation = new ArrayList<>();

    private String[] lookupName = {"heater", "dishwasher", "charger", "fridge"};

    private Context c;

    public AnalysisAdapter(Context context, int resource)
    {
        super(context, resource);
        this.c = context;
    }

    public void add(String newAppliance)
    {
        if(newAppliance.equals("All") || newAppliance.equals("No Connected Device"))
        {
            Log.d("Adapter", newAppliance + " added with position " + -1);

            appliance.add(newAppliance);
            animation.add(-1);

            super.add(newAppliance);
        }
        else
        {
            int position = 0;

            for (int i = 0; i < lookupName.length; i++)
            {
                if (lookupName[i].equals(newAppliance))
                {
                    position = i;
                    i = lookupName.length;
                }
            }

            Log.d("Adapter", newAppliance + " added with position " + position);

            appliance.add(newAppliance);
            animation.add(position);

            super.add(newAppliance);
        }
    }

    public boolean isAlreadyInList(String testAppliance) { return this.appliance.contains(testAppliance);}

    static class RowHolder
    {
        TextView APPLIANCE;
        ImageView ANIMATION;
    }

    @Override
    public int getCount()
    {
        return this.appliance.size();
    }

    @Override
    public Object getItem(int position)
    {
        return this.appliance.get(position);
    }

    public void remove(String removeAppliance)
    {
        int removePosition = appliance.indexOf(removeAppliance);
        appliance.remove(removeAppliance);
        animation.remove(removePosition);
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row;
        row = convertView;
        RowHolder holder;

        final int currentPosition = position;

        //Inflate row
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.analysis_item, parent, false);

            holder = new RowHolder();

            holder.APPLIANCE = (TextView) row.findViewById(R.id.analysis_item_text);
            holder.ANIMATION = (ImageView) row.findViewById(R.id.animation_item_image);

            holder.APPLIANCE.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    for(int i = 0; i < appliance.size(); i ++)
                        Log.d("Adapter", "All appliance in order: " + appliance.get(i));

                    Log.d("Adapter", appliance.get(currentPosition) + " send to analysis with position " + currentPosition );

                    Intent intent= new Intent(c, AnalysisActivity.class);
                    intent.putExtra("DEVICENAME", (String) appliance.get(currentPosition));
                    intent.putExtra("STARTINGACTIVITY", "ConnectedDeviceActivity");
                    c.startActivity(intent);

                }
            });

            row.setTag(holder);
        } else
            holder = (RowHolder) row.getTag();

        //Display name
        String EM = (String) getItem(position);

        holder.APPLIANCE.setText(EM);

        int deviceID = (int) animation.get(position);


        if (deviceID == 0) //heater
            holder.ANIMATION.setBackgroundColor(Color.GREEN);
        else if (deviceID == 1) //dishwasher
            holder.ANIMATION.setBackgroundColor(Color.YELLOW);
        else if (deviceID == 2) //charger
            holder.ANIMATION.setBackgroundColor(Color.RED);
        else if (deviceID == 3)//fridge
            holder.ANIMATION.setBackgroundColor(Color.BLUE);

        return row;
    }
}

单击列表中的第二个元素（位置应为 1）时，日志显示以下内容。结果显示我的设备列表是正确的，但是点击的项目被标记为0。其余的位置都是正确的。可能还需要提及的是，适配器的元素是由 ConnectedDeviceActivity 中的侦听器添加的，这些侦听器从在线数据库获取信息。

D/DailyAdapter: All appliance in order: All
D/DailyAdapter: All appliance in order: charger
D/DailyAdapter: All appliance in order: dishwasher
D/DailyAdapter: All appliance in order: fridge
D/DailyAdapter: All appliance in order: heater
D/DailyAdapter: All send to analysis with position 0

在我的第二次尝试中，我在 holder 之后添加了第一行，并使用了索引而不是 currentPosition。日志保持不变

holder.APPLIANCE.setTag(position);

int index = (int) v.getTag();

Log.d("Adapter", appliance.get(index) + " send to analysis with position " + index);

这是单击第 3 个元素（位置 2）时的日志：

D/Adapter: All appliance in order: All
D/Adapter: All appliance in order: charger
D/Adapter: All appliance in order: dishwasher
D/Adapter: All appliance in order: fridge
D/Adapter: All appliance in order: heater
D/Adapter: dishwasher send to analysis with position 2

Answer 1

如果一定要获取被点击行在列表中的点击位置，获取起来很简单。更改此行

int index = (int) v.getTag();

和

int index = position;

您正在使用您的这种方法获取视图的位置 -

getView(int position, View convertView, ViewGroup parent)

只需将此位置用作您的行的位置即可。

您还需要知道 getView 方法中的 convertView 是什么，如果您正在检查 if(convertView == null) 在你的适配器代码中。 See the details here.

Answer 2

请注意，您在此行中显示索引。

Log.d("Adapter", appliance.get(currentPosition) + "发送到带位置的分析" + index );

您的索引仅在此处更新一次

int 索引 = (int) v.getTag();

因为 v.setTag() 仅在 convertView == null 为 true 时设置一次 (这里position总是0)

现在，这是 v.imp -

这段代码全部保存到这里

row.setTag(持有人);

并像这样检索-

holder = (RowHolder) row.getTag();

所以无论你点击哪一行，它总是打印 0。

U 可以打印 position 或 currentPosition 或更新每一行的索引。

适配器中第二个元素的位置错误

wrong position for second element in adapter

java

android

listview

adapter