当我按下自定义列表视图中存在的按钮时，它会从我想要的那一行中删除另一行

Question

我已经创建了一个自定义列表视图适配器，它就像一个带有行和列的 table。

我还没有完全理解 getView 方法是如何工作的。

每一行的最后一列，我都放置了一个拒绝按钮。当我按下这个按钮时，它会删除特定的行。

问题是当我按下时它没有删除行，相反，它会删除另一行。

我引用自定义适配器的代码

public class ListViewAdapter extends BaseAdapter
{
    public final String TAG = getClass().getSimpleName();
    public ArrayList<HashMap<String, String>> list;
    Activity activity;
    TextView txtFirst;
    TextView txtSecond;
    TextView txtThird;
    TextView txtFourth;
    ImageView imgView;
    //Button btn_con;
    ImageView btn_con,btn_rej;
    Button btn_popup;
    PopupWindow m_popupWindow;
    private RelativeLayout m_relativeLayout;

    public ListViewAdapter(Activity activity, ArrayList<HashMap<String, String>> list)
    {
        super();
        this.activity = activity;
        this.list = list;
    }

    @Override
    public int getCount()
    {
        // TODO Auto-generated method stub
        return list.size();
    }

    @Override
    public Object getItem(int position)
    {
        // TODO Auto-generated method stub
        return list.get(position);
    }


    @Override
    public long getItemId(int position)
    {
        // TODO Auto-generated method stub
        return 0;
    }

    public void updateItem(JSONObject p_jsonObject)
    {
        Log.d(TAG,"update custom list view");
        String id_ka=null,sw_ka=null,hw_ka=null,battery_ka=null,sw_color=null;
        try
        {
            id_ka = p_jsonObject.getString("id_ka");
            sw_ka = p_jsonObject.getJSONObject("sw_ka").getString("version");
            sw_color = p_jsonObject.getJSONObject("sw_ka").getString("color");
            hw_ka = p_jsonObject.getJSONObject("hw_ka").getString("version");
            battery_ka = p_jsonObject.getJSONObject("battery_ka").getString("level");
        }
        catch (JSONException p_e)
        {
            p_e.printStackTrace();
        }
        for(int i=0;i<list.size();i++)
        {
            if(list.get(i).get("id").equals(id_ka))
            {
                list.get(i).put(SWVERSION,sw_ka);
                list.get(i).put(HWVERSION,hw_ka);
                list.get(i).put(BATTERY_LEVEL,battery_ka);
                list.get(i).put(SWVERSION_COLOR,sw_color);
            }
        }
    }

    public boolean checkIfIdExistsInList(JSONObject p_jsonObject)
    {
        if (list == null)
        {
            Log.d(TAG,"List has not created");
        }
        if(list.size()==0)
        {
            Log.d(TAG,"List has 0 elements");
            return false;
        }
        String id_ka = null;
        try
        {
            id_ka = p_jsonObject.getString("id_ka");
        }
        catch (JSONException p_e)
        {
            p_e.printStackTrace();
        }
        for(int i=0;i<list.size();i++)
        {
            if (list.get(i).get("id").equals(id_ka))
            {
                Log.d(TAG,"ka with id "+id_ka+" exists in the list");
                return true;
            }
        }
        Log.d(TAG,"ka with id " +id_ka+" does not exist in the list");
        return false;
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {

        final LayoutInflater inflater = activity.getLayoutInflater();

        if (convertView == null)
        {

            convertView = inflater.inflate(R.layout.column_row, (ViewGroup)null);
            m_relativeLayout = (RelativeLayout) convertView.findViewById(R.id.activity_main);

            txtFirst = (TextView) convertView.findViewById(R.id.ka_id);
            txtSecond = (TextView) convertView.findViewById(R.id.battery_volt);
            txtThird = (TextView) convertView.findViewById(R.id.sw_version);
            txtFourth = (TextView) convertView.findViewById(R.id.image);
            imgView = (ImageView)convertView.findViewById(R.id.imgView);
            btn_con = (ImageView)convertView.findViewById(R.id.btn_con);
            btn_rej = (ImageView)convertView.findViewById(R.id.btn_rej);
        }

        final HashMap<String, String> map = list.get(position);
        Log.d(TAG, map.get(KA_ID) + " updates UI in position " + String.valueOf(position));
        txtFirst.setText(map.get(KA_ID));
        txtSecond.setText(map.get(SWVERSION));
        txtSecond.setBackgroundColor(Color.parseColor(map.get(SWVERSION_COLOR)));
        txtThird.setText(map.get(HWVERSION));
        txtFourth.setText(map.get(BATTERY_LEVEL));
        btn_rej.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                list.remove(position);
                notifyDataSetChanged();

            }
        });
        return convertView;
    }

}

我的主要activity

public class MainActivity extends AppCompatActivity
{
    private final String TAG = getClass().getSimpleName();
    private ArrayList<HashMap<String,String>> list;
    private static int obj_id =0;
    Button bn;
    Handler resultHandler;
    DoSomethingThread randomWork;
    ListView lv,lv_header;
    ListViewAdapter customAdapter;
    LinearLayout ln;
    private String file_name = null;
    private String jsonobj = null;
    Random rand;
    Button btn_show,btn_update,btn_remove,btn_popup;
    JSONObject jobjDemo;
    PopupWindow m_popupWindow;
    LayoutInflater m_layoutInflater;
    RelativeLayout m_relativeLayout;


    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.progressbar);
        setContentView(R.layout.activity_main);
        createButtons();
        lv = (ListView)findViewById(R.id.mainLV);
        list = new ArrayList<HashMap<String, String>>();


    }

    private void createButtons()
    {
        m_relativeLayout = (RelativeLayout) findViewById(R.id.activity_main);
        btn_popup = (Button)findViewById(R.id.btn_popup);
        btn_popup.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                m_layoutInflater = (LayoutInflater)getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
                ViewGroup container = (ViewGroup) m_layoutInflater.inflate(R.layout.popup,null);
                m_popupWindow = new PopupWindow(container,400,400,true);
                m_popupWindow.showAtLocation(m_relativeLayout, Gravity.NO_GRAVITY,500,500);

                container.setOnTouchListener((
                        new View.OnTouchListener()
                        {
                            @Override
                            public boolean onTouch(View v, MotionEvent event)
                            {
                                m_popupWindow.dismiss();
                                return true;
                            }
                        }));


            }
        });
        btn_show = (Button) findViewById(R.id.btn_show);
        btn_show.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                boolean id_exist = false;
                if(customAdapter != null)
                {
                    id_exist = customAdapter.checkIfIdExistsInList(jobjDemo);
                }
                if(id_exist)
                {
                    Log.d(TAG,"id exists in list view, updating...");
                    updateListView(jobjDemo);
                }
                else
                {
                    Log.d(TAG,"id does not exist in list view, add element...");
                    startGenerating(jobjDemo);
                }

            }
        });
        btn_update = (Button)findViewById(R.id.btn_update);
        btn_update.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Log.d(TAG,"JSON file has been updated");
                String json_path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath();
                jobjDemo = getJSonFromFile(json_path+"/test.json");
            }
        });
        btn_remove = (Button)findViewById(R.id.btn_remove);
        btn_remove.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Log.d(TAG,"remove element from custom list view");
            }
        });
    }



    private void updateListView(JSONObject p_jsonObject)
    {
        if (lv.getAdapter()== null)
        {
            Log.d(TAG,"ListView has not created yet");
            return;

        }
        if (lv.getAdapter().getCount() == 0)
        {
            Log.d(TAG, "ListView has 0 elements");
            return;
        }
        customAdapter.updateItem(p_jsonObject);
        customAdapter.notifyDataSetChanged();
        lv.setAdapter(customAdapter);

    }


    private void startGenerating(JSONObject p_jsonObject)
    {
        String id_ka=null,sw_ka=null,hw_ka=null,battery_ka=null,sw_color=null;
        getWindow().getDecorView().getRootView().findViewById(R.id.list_headers).setVisibility(LinearLayout.VISIBLE);
        try
        {
            id_ka = p_jsonObject.getString("id_ka");
            sw_ka = p_jsonObject.getJSONObject("sw_ka").getString("version");
            sw_color = p_jsonObject.getJSONObject("sw_ka").getString("color");
            hw_ka = p_jsonObject.getJSONObject("hw_ka").getString("version");
            battery_ka = p_jsonObject.getJSONObject("battery_ka").getString("level");
        }
        catch (JSONException p_e)
        {
            p_e.printStackTrace();
        }
        HashMap<String,String> temp = new HashMap<String,String>();
        temp.put(KA_ID,id_ka);
        temp.put(SWVERSION,sw_ka);
        temp.put(SWVERSION_COLOR,sw_color);
        temp.put(HWVERSION,hw_ka);
        temp.put(BATTERY_LEVEL,battery_ka);
        list.add(temp);
        customAdapter=new ListViewAdapter(this, list);
        lv.setAdapter(customAdapter);
    }



    @Override
    public void onResume()
    {
        super.onResume();
        Log.d(TAG,"Data has changed");
    }


}

我到目前为止所做的并且它正在工作，但我不确定这是正确的实现是使 public 和静态自定义适配器并在自定义适配器中使用相同的对象。

任何建议，感谢您的帮助！

Answer 1

您可以试试下面的代码

 list.remove(position + 1);
 notifyDataSetChanged();

Answer 2

试试这个

 @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {

        final LayoutInflater inflater = activity.getLayoutInflater();

        if (convertView == null)
        {

            convertView = inflater.inflate(R.layout.column_row, (ViewGroup)null);
            m_relativeLayout = (RelativeLayout) convertView.findViewById(R.id.activity_main);

            txtFirst = (TextView) convertView.findViewById(R.id.ka_id);
            txtSecond = (TextView) convertView.findViewById(R.id.battery_volt);
            txtThird = (TextView) convertView.findViewById(R.id.sw_version);
            txtFourth = (TextView) convertView.findViewById(R.id.image);
            imgView = (ImageView)convertView.findViewById(R.id.imgView);
            btn_con = (ImageView)convertView.findViewById(R.id.btn_con);
            btn_rej = (ImageView)convertView.findViewById(R.id.btn_rej);
        }

        final HashMap<String, String> map = list.get(position);
        Log.d(TAG, map.get(KA_ID) + " updates UI in position " + String.valueOf(position));
        txtFirst.setText(map.get(KA_ID));
        txtSecond.setText(map.get(SWVERSION));
        txtSecond.setBackgroundColor(Color.parseColor(map.get(SWVERSION_COLOR)));
        txtThird.setText(map.get(HWVERSION));
        txtFourth.setText(map.get(BATTERY_LEVEL));
        btn_rej.setTag(position);
        btn_rej.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                int rposition=v.getTag();
                list.remove(rposition);
                notifyDataSetChanged();

            }
        });
        return convertView;
    }

Answer 3

试试这个

像这样创建新的接口名称 DeleteRow :

public interface DeleteRow {
void deleteRow(int position);
}

在您的 MainActivity 中添加

implements DeleteRow

像这样

public class MainActivity extends AppCompatActivity implements DeleteRow{
// your class

@Override
public void deleteRow(int position) {
    list.remove(position);
    listView.removeViewAt(position);
    listViewAdapter.notifyItemRemoved(position);
    listViewAdapter.notifyItemRangeChanged(position, list.size());
}
}

将此参数添加到您的适配器

customAdapter = new ListViewAdapter(... , this);

在 ListViewAdapter 添加

DeleteRow deleterow;

public ListViewAdapter(Activity activity, ArrayList<HashMap<String, String>> list, DeleteRow deleterow)
{
    super();
    this.activity = activity;
    this.list = list;
    this.deleterow = deleterow;
}

在点击监听器中

 btn_remove.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            deleteRow.deleteRow(position);
            Log.d(TAG,"remove element from custom list view");
        }
    });

Answer 4

以上所有解决方案均无效。相反，如果我将 customAdapter 和 lv 变为 public 并在 Mainactivity

中变为静态

public static ListView lv;
public static ListViewAdapter customAdapter;

并在 ListViewAdapter 内部

btn_rej.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {

                list.remove(position);
                customAdapter.notifyDataSetChanged();
                lv.setAdapter(customAdapter);

            }
        });

这将完成这项工作。但正如我所说，我不知道这是否是正确的方法。

当我按下自定义列表视图中存在的按钮时，它会从我想要的那一行中删除另一行

when I press a button which exists inside the custom list view it deletes another row from the one that I want

android

listview-adapter