如何处理来自搜索管理器的回调?
让我们假设以下情况:
Activity A calls Search Manager
User searches, and search results are displayed in Activity B
User clicks on a list item in Activity B
App switches back to Activity A
我无法处理从活动 B 到活动 A 的回调,因为我没有搜索管理器意图(我认为?)。
呼叫搜索管理器(在活动 A 中)
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.add_symbol:
onSearchRequested(); //result of search will show Activity B
return true;
default:
return super.onOptionsItemSelected(item);
}
}
用户选择列表项后返回活动 A
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Quote myQuote = new Quote();
myQuote.name = (companies.get(position).name);
myQuote.symbol = (companies.get(position).symbol);
//TODO: add new quote to master quote list in Main
//TODO: serialize in Main
//TODO: go back to last activity
Intent myIntent = new Intent(getApplicationContext(), Main.class);
startActivityForResult(myIntent, PICK_COMPANY_REQUEST);
}
});
在活动 A 中处理回调:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICK_COMPANY_REQUEST) {
if (resultCode == RESULT_OK) {
Toast toast = Toast.makeText(getApplicationContext(), "Stock added", Toast.LENGTH_SHORT);
toast.show();
}
}
}
PICK_COMPANY_REQUEST
永远不会发送到回调。这是为什么呢?我假设是因为搜索管理器有意图,而不是活动 B。我如何确保它被调用?
onActivityResult() 永远不会被调用。为什么?
Let's assume the following:
Activity A calls Search Manager
User searches, and search results are displayed in Activity B
User clicks on a list item in Activity B
App switches back to Activity A
I am unable to handle this callback from Activity B to Activity A because I don't have the Search Manager intent (i think?).
Call Search Manager (in Activity A)
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.add_symbol:
onSearchRequested(); //result of search will show Activity B
return true;
default:
return super.onOptionsItemSelected(item);
}
}
Go back to Activity A after user has selected a list item
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Quote myQuote = new Quote();
myQuote.name = (companies.get(position).name);
myQuote.symbol = (companies.get(position).symbol);
//TODO: add new quote to master quote list in Main
//TODO: serialize in Main
//TODO: go back to last activity
Intent myIntent = new Intent(getApplicationContext(), Main.class);
startActivityForResult(myIntent, PICK_COMPANY_REQUEST);
}
});
In Activity A handle the call back:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICK_COMPANY_REQUEST) {
if (resultCode == RESULT_OK) {
Toast toast = Toast.makeText(getApplicationContext(), "Stock added", Toast.LENGTH_SHORT);
toast.show();
}
}
}
The PICK_COMPANY_REQUEST
is never sent to the call back. Why is this? I am assuming because the Search Manager has the intent, and not Activity B. How can I make sure this gets invoked?
onActivityResult() is never called. Why?
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评论(2)
我在 Android 上发布了我认为相同问题的答案onSearchRequested() 回调调用活动
Skythe 是正确的,
onActivityResult
没有被调用,因为活动 A 没有启动结果的搜索活动。为了解决这个问题,我将 Activity A 也定义为可搜索的 actvity(在清单中),以便它接收搜索意图,然后使用
startActivityForResult
手动启动 Activity B,传入查询并让Activity B 照常处理搜索。您可以在上面的链接中查看我的回复,或者我有一个 这篇博文中有更详细的描述。
I posted an answer to what I think is the same problem at Android onSearchRequested() callback to the calling activity
Skythe is right that
onActivityResult
isn't called because Activity A isn't starting the search activity for a result.To work around this, I made Activity A also defined as the searchable actvity (in the manifest), so that it receives the search intent and then manually launch Activity B with
startActivityForResult
, passing in the query and letting Activity B handle the search as normal.You can see my response at the link above or I have a more detailed write-up in this blog post.
我真的怀疑您是否需要在 onclickListener 上为您的 Main 活动调用一个新意图。
由于该活动已经在堆栈中,因此您可以完成它
I really doubt whether you need to call a new intent for your Main activity on your onclickListener.
Since the activity is already here in the stack you can just finish it