我正在尝试创建动态列表视图。我可以添加一个项目,但现在无法删除。该代码实际上非常简单,我看到的每个指南对于我和我的代码来说都太复杂了。我希望在MainActivity中添加一些简单的内容,以删除选择的项目。我不在乎以哪种方式滑动,例如gmail或通过单击或任何其他方式。.我只希望我有一种简单的方法来删除列表中的元素。这是活动
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以删除我的活动代码中的项目?谢谢
试试这个,虽然ListView项长了ClickListener,但是您可以做到这一点
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;
}
});
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