java - 从 ListView 中删除元素(滑动或单击)

Question

我正在尝试创建一个动态 ListView 。我可以添加一个项目，但现在无法删除它。代码实际上非常简单，我看到的每个指南对我和我的代码来说都太复杂了。我想要在我的 MainActivity 中添加一些简单的内容来删除选定的项目。我不在乎以哪种方式，像 gmail 一样滑动或通过单击或任何其他方式。我只想要简单的方法来删除列表中的元素。这是 Activity

public class MainActivity extends Activity {
    private EditText etInput;
    private Button btnAdd;
    private ListView lvItem;
    private ArrayList<String> itemArrey;
    private ArrayAdapter<String> itemAdapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setUpView();

    }

    private void setUpView() {
        // TODO Auto-generated method stub
        etInput = (EditText)this.findViewById(R.id.editText_input);
        btnAdd = (Button)this.findViewById(R.id.addbtn);
        lvItem = (ListView)this.findViewById(R.id.listView_items);


        itemArrey = new ArrayList<String>();
        itemArrey.clear();

        itemAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,itemArrey);
        lvItem.setAdapter(itemAdapter);


        btnAdd.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                addItemList();
            }
        });

        etInput.setOnKeyListener(new View.OnKeyListener() {

            public boolean onKey(View v, int keyCode, KeyEvent event) {
                // TODO Auto-generated method stub

                if (keyCode == KeyEvent.KEYCODE_ENTER) {
                    addItemList();
                }
                return true;
            }
        });


    }

    protected void addItemList() {

    if (isInputValid(etInput)) {
        itemArrey.add(0,etInput.getText().toString());
        etInput.setText("");

        itemAdapter.notifyDataSetChanged();

    }   

    }

    protected boolean isInputValid(EditText etInput2) {
        // TODO Auto-generatd method stub
        if (etInput2.getText().toString().trim().length()<1) {
            etInput2.setError("Insert a value");
            return false;
        } else {
            return true;
        }

    }
}

是否可以插入代码的某些部分来删除我的 Activity 代码中的项目？谢谢

Answer 1

试试这个，当 ListView 项目长 ClickListener 时你可以做到

 lvItem.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View v,
                int position, long id) {
            // TODO Auto-generated method stub
                                AlertDialog.Builder adb = new AlertDialog.Builder(
                    YourActivity.this);
            adb.setTitle("Are you sure want to delete this item");
            adb.setPositiveButton("Yes",
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog,
                                int which) {
                            // TODO Auto-generated method stub
                            itemArrey.remove(position);
                            itemAdapter.notifyDataSetChanged();


                        }
                    });
            adb.setNegativeButton("NO",
                    new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog,
                                int which) {
                            // TODO Auto-generated method stub
                             dialog.dismiss();

                        }
                    });
            adb.show();

            return false;
        }
    });