Question

我应该在onItemLongClick函数中写一下，以便在长按一下从列表视图中删除一个项目。以下是代码：

public class Favorites extends AppCompatActivity {

DBConnection db = new DBConnection(this);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_favorites);

     ListView listView = (ListView) findViewById(R.id.empList);
     ArrayList<String> arrayList = db.getAllRecords();
     listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,arrayList));

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
       @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                                        int position, long id) {



            return false;
        }

Answer 1

对于listView，你应该 setOnItemLongClickListener ，并在删除项目时定义适配器来更新数据

ListView listView = (ListView) findViewById(R.id.empList);
    final ArrayList<String> arrayList = db.getAllRecords();
    final ArrayAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,arrayList);
    listView.setAdapter(adapter);

    listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
            arrayList.remove(i);
            adapter.notifyDataSetChanged();
            return true;
        }
    });

Answer 2

在我的例子中，我使用自定义Adapter类作为将数据连接到ListView之间的过程。在这种情况下，它将类似于以下内容：

Adapter adapter = new Adapter(this, arrayList);
String s = (String) arrayList.get(position);
arrayList.remove(s);
adapter.notifyDataSetChanged();

再看看这个回购：

https://github.com/CarmenDelessio/Hour8Application/tree/master/app/src/main/java/com/bffmedia/hour8application

特别是，BaseAdapterActivity.java值得用作模型。

Answer 3

您可以尝试从阵列列表中删除元素

arrayList.remove(position);

长按从android listview中删除项目

3 个答案: