在我的应用程序中，我有两种情况需要刷新 ListView (customersList)：
1）搜索客户时，我必须在 SearchView 中处理建议项点击
2）当我想显示在另一个活动中创建的新客户时
我有负责刷新 ListView 的单一方法：
private void showCustomer(Integer customerId) {
ListView customersList = (ListView) findViewById(id.list);
if(customersList != null) {
Integer listId = getItemPositionByAdapterId(customersList.getAdapter(), customerId);
customersList.performItemClick(
customersList.getAdapter().getView(listId, null, null),
listId,
customersList.getAdapter().getItemId(listId)
);
customersList.requestFocusFromTouch();
customersList.setSelection(listId);
}
}
private int getItemPositionByAdapterId(ListAdapter adapter, final long id)
{
for (int i = 0; i < adapter.getCount(); i++)
{
if (adapter.getItemId(i) == id)
return i;
}
return -1;
}
showCustomer() 方法在两个地方被调用：
/**
* Scenario 1: Handle suggestions item click
*/
@Override
protected void onNewIntent(Intent intent) {
if (Intent.ACTION_VIEW.equals(intent.getAction()))
Uri data = intent.getData();
String customerIdString = data.getLastPathSegment();
Integer customerId = Integer.parseInt(customerIdString);
if (customerId != null) {
showCustomer(customerId);
}
}
super.onNewIntent(intent);
}
/**
* Scenario 2: Handle new customer creation
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Check which request we're responding to
switch (requestCode) {
case RESULT_CUSTOMER_ADD:
// Make sure the request was successful
if (resultCode == RESULT_OK) {
Integer customerId = data.getIntExtra(MyContract.CustomersEntry._ID, 0);
// This one doesn't work as expected!
showCustomer(customerId);
}
break;
}
}
从 onNewIntent() 调用（建议单击项目）时，一切正常 - 项目被选中，列表滚动到项目。
从 onActivityResult() 调用时，该项目被选中，但列表不会滚动到适当的元素。
我没主意了。为什么在这两种情况下它的工作方式不同？任何帮助将不胜感激。