Java ContextMenu无法使用自定义适配器从ListView中删除行

问题是：My ContextMenu无法使用自定义适配器和 应用程序崩溃，错误为：UnsupportedOperationException，请参阅Logcat输出

我做过谷歌搜索和stackoverflow搜索。我所找到的任何信息都不能解决这个问题

我的问题是：我的代码有什么问题？ 请提供解决此问题的正确代码

Java代码：

        public class TestActivity extends ListActivity {

        private String itemNameArray[];
        private String dateArray[];

        private ListView listview;
        CustomListViewAdapter customListViewAdapter;

                        @Override
                        public void onCreate(Bundle savedInstanceState) {
                            super.onCreate(savedInstanceState);

                            setContentView(R.layout.activity_test);

                            registerForContextMenu(getListView());

                            root = Environment.getExternalStorageDirectory() + File.separator + "/ListTestFiles";
                            getDir(root);

            listview = getListView();

            name=itemNameArray;
            lastmod=dateArray;

            customListViewAdapter = new CustomListViewAdapter(this, name, lastmod);

            listview.setAdapter(customListViewAdapter);

      } // End of onCreate code.


        class CustomListViewAdapter extends ArrayAdapter<String> {
            Context context;
            String[] nameArray;
            String[] modifiedArray;

            CustomListViewAdapter(Context c, String[] name, String[] lastmod)
            {
                super(c, R.layout.layout_item_view, R.id.rowtext, name);
                this.context = c;
                this.nameArray = name;
                this.modifiedArray = lastmod;
            }

            public View getView(int position, View convertView, ViewGroup parent)
            {
                LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                View row = inflater.inflate(R.layout.layout_item_view, parent, false);

                TextView myName;
                TextView myLastMod;

                myName=(TextView) row.findViewById(R.id.rowtext);
                myName.setText(nameArray[position]);

                myLastMod=(TextView) row.findViewById(R.id.textView6);
                myLastMod.setText(modifiedArray[position]);

                return row;
            }
        }


         @Override
         public void onCreateContextMenu(ContextMenu menu, View v,
                                         ContextMenu.ContextMenuInfo menuInfo) {
             super.onCreateContextMenu(menu, v, menuInfo);
                 MenuInflater inflater = getMenuInflater();
                 inflater.inflate(R.menu.context_menu, menu);
         }

        @Override
        public boolean onContextItemSelected(MenuItem itemMenu) {

            final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)itemMenu.getMenuInfo();

            switch (itemMenu.getItemId()) {
                case R.id.context_menu_rename:
                    Toast.makeText(this, "Rename", Toast.LENGTH_SHORT).show();
                    return true;
                case R.id.context_menu_delete:
                    // NOTE TESTING the line of code below caused a runtime error: java.lang.UnsupportedOperationException
                    customListViewAdapter.remove(customListViewAdapter.getItem(info.position));
                    customListViewAdapter.notifyDataSetChanged();

                    Toast.makeText(getApplicationContext(), "position = " + info.position, Toast.LENGTH_SHORT).show();
                    Toast.makeText(this, "Delete", Toast.LENGTH_SHORT).show();

                return true;

                return super.onContextItemSelected(itemMenu);
        }
    }
}

---

只需从该特定位置的名称数组和修改数组中删除项，然后通知适配器

我明白了。一个大错误是在需要动态大小数组的地方使用固定大小数组

换衣服

String nameArray[];
String modifiedArray[];

到

arraylistnamearray；
ArrayList修饰Darray；

我修改了你的工作：

public class TestActivity extends ListActivity { 
    private ArrayList<String> itemNameArray;
     private ArrayList<String> dateArray;
     private ListView listview;
     CustomListViewAdapter customListViewAdapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_test);
     registerForContextMenu(getListView());
 String root = Environment.getExternalStorageDirectory() + File.separator + "/ListTestFiles";
     getDir(root);

     listview = getListView();

     CustomListViewAdapter = new CustomListViewAdapter(this, itemNameArray, dateArray);
     listview.setAdapter(customListViewAdapter);
     }
     // End of onCreate code. class

     CustomListViewAdapter extends ArrayAdapter<String> { 
    ArrayList<String> nameArray;
     ArrayList<String> modifiedArray; CustomListViewAdapter(Context c, ArrayList<String> name, ArrayList<String> lastmod) {
     super(c, 0, name); 
     this.nameArray = name;
     this.modifiedArray = lastmod;
     } 
    public View getView(int position, View convertView, ViewGroup parent) { 
    LayoutInflater inflater=LayoutInflater.from(parent.get context());
     convertView = inflater.inflate(R.layout.layout_item_view, parent, false); 
    TextView myName; 
    TextView myLastMod;
     myName=(TextView) row.findViewById(R.id.rowtext);
     myName.setText(nameArray.get(position));
     myLastMod=(TextView) row.findViewById(R.id.textView6);
     myLastMod.setText(modifiedArray.get(position));
     return convertView;
     }
     }

     @Override
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { 
    super.onCreateContextMenu(menu, v, menuInfo); 
    getMenuInflater().inflate(R.menu.context_menu, menu); 
    }

     @Override 
    public boolean onContextItemSelected(MenuItem itemMenu) {

    switch (itemMenu.getItemId()) { 
    case R.id.context_menu_rename:
     Toast.makeText(this, "Rename", Toast.LENGTH_SHORT).show();
     break; 
    case R.id.context_menu_delete: itemNameArray.remove(listView.getSelectedItemPosition());
    dateArray.remove(listView.getSelectedItemPosition()); customListViewAdapter.notifyDataSetChanged(); 
     break; 
    }
    return true;
     }
     }

公共类测试活动扩展了ListActivity{
私有ArrayList itemNameArray；
私有数组列表日期数组；
私有列表视图列表视图；
CustomListViewAdapter CustomListViewAdapter；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_测试）；
registerForContextMenu（getListView（））；
String root=Environment.getExternalStorageDirectory（）+File.separator+“/ListTestFiles”；
getDir（根）；
listview=getListView（）；
CustomListViewAdapter=新的CustomListViewAdapter（this、itemNameArray、dateArray）；
setAdapter（customListViewAdapter）；
}
//onCreate代码.class的结束
CustomListViewAdapter扩展了ArrayAdapter{
ArrayList名称数组；
ArrayList ModifierDarray；CustomListViewAdapter（上下文c、ArrayList名称、ArrayList lastmod）{
super（c，0，name）；
this.nameArray=name；
this.modifiedArray=lastmod；
} 
公共视图getView（int位置、视图转换视图、视图组父级）{
LayoutInflater充气器=LayoutInflater.from（parent.get context（））；
convertView=充气机。充气（R.layout.layout\u item\u视图，父视图，false）；
TextView我的名字；
文本视图myLastMod；
myName=（TextView）row.findViewById（R.id.rowtext）；
setText（nameArray.get（position））；
myLastMod=（TextView）row.findViewById（R.id.textView6）；
myLastMod.setText（modifiedArray.get（position））；
返回视图；
}
}
@凌驾
public void onCreateContextMenu（ContextMenu菜单，视图v，ContextMenu.ContextMenuInfo菜单信息）{
super.onCreateContextMenu（menu，v，menuInfo）；
getMenuInflater（）.充气（R.menu.context_菜单，菜单）；
}
@凌驾
选择公共布尔OnContextItem（MenuItemMenu）{
开关（itemMenu.getItemId（））{
案例R.id.context\u菜单\u重命名：
Toast.makeText（这个“重命名”，Toast.LENGTH_SHORT）.show（）；
打破
case R.id.context_菜单_删除：itemNameArray.remove（listView.getSelectedItemPosition（））；
dateArray.remove（listView.GetSelectEditePosition（））；customListViewAdapter.notifyDataSetChanged（）；
打破
}
返回true；
}
}

1。你是说删除nameArray和ModifierDarray的所有代码？2.如果我这样做，我的ListView将不会在TextView中显示任何数据。请删除在该位置找到的特定项。由于您有两个ArrayList:nameArray和modifiedArray，因此必须在每个数组上删除该位置的项；私有字符串日期数组[]；1.我的ListView（包括CustomListViewAdapter类及其字符串数组）在显示ListView和所有填充了数据的行方面运行良好。2.我现在的目标是删除通过长时间单击选定的整行。3.我并不是只想从行中的文本视图中删除数据。4.下面的代码似乎试图仅删除行中文本视图中的数据：itemNameArray.remove（listView.GetSelectEditePosition（））；删除（listView.getSelectedItemPosition（））；我想，你不明白！！！！！！！！！！！[]的数组，如字符串[]是用于固定大小的数组！！！；；！！！！！！！！！！！！！！！！！！！！！！！你不能缩小或扩大它的大小！！！！！！！！要增加或减少数组中的项目数，必须使用集合数组包，如ArrayList！！！！！！！！！！！！！！！！！

ArrayList<String> nameArray;
 ArrayList<String> modifiedArray;

public class TestActivity extends ListActivity { 
    private ArrayList<String> itemNameArray;
     private ArrayList<String> dateArray;
     private ListView listview;
     CustomListViewAdapter customListViewAdapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_test);
     registerForContextMenu(getListView());
 String root = Environment.getExternalStorageDirectory() + File.separator + "/ListTestFiles";
     getDir(root);

     listview = getListView();

     CustomListViewAdapter = new CustomListViewAdapter(this, itemNameArray, dateArray);
     listview.setAdapter(customListViewAdapter);
     }
     // End of onCreate code. class

     CustomListViewAdapter extends ArrayAdapter<String> { 
    ArrayList<String> nameArray;
     ArrayList<String> modifiedArray; CustomListViewAdapter(Context c, ArrayList<String> name, ArrayList<String> lastmod) {
     super(c, 0, name); 
     this.nameArray = name;
     this.modifiedArray = lastmod;
     } 
    public View getView(int position, View convertView, ViewGroup parent) { 
    LayoutInflater inflater=LayoutInflater.from(parent.get context());
     convertView = inflater.inflate(R.layout.layout_item_view, parent, false); 
    TextView myName; 
    TextView myLastMod;
     myName=(TextView) row.findViewById(R.id.rowtext);
     myName.setText(nameArray.get(position));
     myLastMod=(TextView) row.findViewById(R.id.textView6);
     myLastMod.setText(modifiedArray.get(position));
     return convertView;
     }
     }

     @Override
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { 
    super.onCreateContextMenu(menu, v, menuInfo); 
    getMenuInflater().inflate(R.menu.context_menu, menu); 
    }

     @Override 
    public boolean onContextItemSelected(MenuItem itemMenu) {

    switch (itemMenu.getItemId()) { 
    case R.id.context_menu_rename:
     Toast.makeText(this, "Rename", Toast.LENGTH_SHORT).show();
     break; 
    case R.id.context_menu_delete: itemNameArray.remove(listView.getSelectedItemPosition());
    dateArray.remove(listView.getSelectedItemPosition()); customListViewAdapter.notifyDataSetChanged(); 
     break; 
    }
    return true;
     }
     }