Question

我无法使用ListView的每一行中的删除按钮删除项目。我不知道如何获取Listview项目按钮单击的当前位置。你能帮我解决一下这个问题。我想要做的就是当我点击删除按钮时，特定行被删除。

以下是主要活动代码和xml代码

我的可展开列表视图的Xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:slide="http://schemas.android.com/apk/res/com.example.test_expendable"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".Create_Team_Form" >

<RelativeLayout
    android:id="@+id/item"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="Hello World"
        android:textSize="20dip" />

    <Button
        android:id="@+id/expandable_toggle_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="@string/Team_More" />
</RelativeLayout>

<LinearLayout
    android:id="@+id/expandable"
    android:layout_width="fill_parent"
    android:layout_height="40dip"
    android:background="#000000"
    android:orientation="horizontal" >


    <Button
        android:id="@+id/btn_Del"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="0.5"
        android:onClick="Team_Delete"
        android:text="@string/Team_Del"
        android:textSize="12dip" />


    <Button
        android:id="@+id/btn_Details"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="0.5"
        android:onClick="Team_Details"
        android:text="@string/Team_Detail"
        android:textSize="12dip" />

   </LinearLayout>

 </LinearLayout>

我的主要活动Xml代码，我有ListView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TableLayout
        android:id="@+id/Team_Create_MainTable"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TableRow
            android:id="@+id/tableRow1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/btn_Create"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="Create_Team"
                android:text="@string/Team_Create_New" />

            <Button
                android:id="@+id/btn_ADD"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/Team_Create_Add" />

            <Button
                android:id="@+id/btn_Edit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/Team_Create_Edit" />

            <Button
                android:id="@+id/btn_Back"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/Team_Create_Back" />

        </TableRow>




        <com.example.fyp_api_8_team.SlideExpandableListView
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/list"
            android:layout_width="fill_parent"
            android:layout_height="465dp" >

        </com.example.fyp_api_8_team.SlideExpandableListView>

    </TableLayout>

</LinearLayout>

我的主要活动代码

import java.util.ArrayList;
import java.util.Arrays;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class Create_Team_Form extends Activity {

    TextView txt;
    private String[] lv_arr = {};
    ArrayList<String> teamNames = new ArrayList<String>();
    ListView list;
    ListAdapter adapter;

    static String[] COUNTRIES;
    //ListView lv1;




    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create__team__form);

        list = (ListView) this.findViewById(R.id.list);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_create__team__form, menu);
        return true;
    }

    public void Create_Team(View v) {
        AlertDialog.Builder alert = new AlertDialog.Builder(this);

        alert.setTitle("CreateTeam");
        alert.setMessage("Enter Team Name");

        // Set an EditText view to get user input
        final EditText input = new EditText(this);
        alert.setView(input);

        alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                // OK
                String ans = input.getText().toString();
                if (ans == null || ans.length() == 0 || ans.equals("")) {

                } else {
                    String value = ans;
                    Add_TeamName_List(value);

                    Set_List();
                }

            }
        });

        alert.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        // Canceled.
                    }
                });

        alert.show();

    }


    public void Add_TeamName_List(String Name) {
        teamNames.add(Name);

        Put_data_Array();

    }

    public void Set_List() {
         adapter = new ArrayAdapter<String>(this,
                R.layout.expandable_list_item, R.id.text, lv_arr);
        list.setAdapter(new SlideExpandableListAdapter(adapter,
                R.id.expandable_toggle_button, R.id.expandable));

        /*
        lv1.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_expandable_list_item_1, lv_arr));
                */
    }

    public void Put_data_Array() {
        lv_arr = new String[teamNames.size()];

        for (int i = 0; i < teamNames.size(); i++) {
            lv_arr[i] = teamNames.get(i);
        }
        Arrays.sort(lv_arr);

        put_Data_again_Arraylist();


    }

    public void put_Data_again_Arraylist()
    {

            teamNames.clear();  
        for (int i = 0; i < lv_arr.length; i++) {

            teamNames.add(lv_arr[i]);
        }

    }



    public void Team_Delete(View v)
    {

        list.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               teamNames.remove(position);
                ((BaseAdapter) adapter).notifyDataSetChanged();
            }
        });
    }

    public void Team_Details(View v)
    {

    }

下面我附上了我的UI的截图

Enter image description here

当我点击“更多”按钮时，我会向用户显示“删除”和“详细信息”按钮。如果用户按“删除”按钮，则应删除该行项。

enter image description here

等待回复我正试图解决这个问题很长一段时间

Answer 1

- 始终使用ArrayList而不是String[]来保存ArrayAdapter将使用的值Collection更加灵活比Arrays

- 点击删除按钮后，您只需删除 ArrayList条目，然后执行notifyDataSetChanged()方法。

<强>例如

ArrayList<String> s = new ArrayList<String>();

s.setList();   // A custom method to fill the list

// assign your ArrayList to the ArrayAdpater here

// set ArrayAdpater to ListView

arrayadapter.notifyDataSetChanged();  // arrayadapter is of the ArrayAdapter which is 
                                      // set with your ArrayList

如何使用“删除”按钮删除可扩展ListView中的项目

1 个答案: