[英]Delete item from listview when the item is clicked
我目前有這個代碼在列表視圖中顯示所選項目:
public class DisplayOrder extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_order);
bar();
Button btn = (Button) findViewById(R.id.btnHome);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent myIntent = new Intent(DisplayOrder.this, Options.class);
startActivity(myIntent);
}
});
}
private void bar() {
ListView lv = (ListView) findViewById(R.id.listViewDisplay);
List<String> itemsOrdered = new ArrayList<String>();
for (Map.Entry<Item, Integer> entry : Datastore.currentTable.getOrder().getItems().entrySet()) {
itemsOrdered.add((entry.getKey().name) + " x " + String.valueOf(entry.getValue()) + " £" + (entry.getKey().price * entry.getValue()));
}
// This is the array adapter, it takes the context of the activity as a
// first parameter, the type of list view as a second parameter and your
// array as a third parameter.
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getBaseContext(), R.layout.activity_display_order, R.id.textView8, itemsOrdered);
lv.setAdapter(arrayAdapter);
}
}
我想要做的是,當我點擊其中一個項目時,它被刪除但我不知道該怎么做。 任何指導都將非常感謝。
您應該通過setOnItemClickListener
檢測何時單擊ListView
的每個項目。
然后在這個方法里面,只需刪除list datasource和notifyDataSetChanged
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView < ? > parent, View view,int position, long id) {
itemsOrdered.remove(position); // remove item at index in list datasource
arrayAdapter.notifyDataSetChanged(); // call it for refresh ListView
Toast.makeText(getApplicationContext(), "remove item at " + position, Toast.LENGTH_LONG).show();
}
});
您必須像這樣覆蓋偵聽器“setOnItemClickListener”:
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
itemsOrdered.remove(item);
arrayAdapter.notifyDataSetChanged();
}
});
此代碼從列表中刪除了ítem,但您必須通知適配器的更改。 通知適配器時,列表視圖會更新。
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