如何在片段中从工具栏中搜索Listview [英] How To Search In Listview From Toolbar In Fragment

问题描述

我正在使用此代码从ListView中的MainActivity工具栏进行搜索：

I was using this code to search from my MainActivity Toolbar in a ListView:

    SearchView searchView;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate( R.menu.main, menu);

    MenuItem myActionMenuItem = menu.findItem( R.id.action_search);
    searchView = (SearchView) myActionMenuItem.getActionView();
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }
        @Override
        public boolean onQueryTextChange(String s) {
            adapter.getFilter().filter(s);
            return false;
        }
    });
    return true;

}

但是现在我将Listview移到了一个片段，怎么能我将适配器从片段传递给主要活动？如何更新打字？
有没有比传递适配器更好的方法？
提前谢谢

But now I moved my Listview to a fragment, how can I pass the adapter from the fragment to the main activity? How can I update the typing? Is there any better way then passing the adapter? Thank you in advance

推荐答案

更好的方法是使用 EventBus 。它在这样的场景中非常有用，我们必须将某些数据从一个Activity传递给一个片段。

A better approach can be using EventBus. It's really helpful in a scenario like this in which we have to pass certain data from an Activity to a Fragment.

要使用EventBus，你需要定义一个 POJO 类，有点像这样：

For using EventBus, you need to define a POJO class, somewhat like this:

class SearchQueryEvent {
    String query;

    public SearchQueryEvent(String query) {
        this.query=query;
    }

    public String getQuery() {
        return query;
    }
}

现在，您的代码应该像这样修改：

Now, your code should be modified like this:

MainActivity.java

SearchView searchView;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate( R.menu.main, menu);

    MenuItem myActionMenuItem = menu.findItem( R.id.action_search);
    searchView = (SearchView) myActionMenuItem.getActionView();
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }
        @Override
        public boolean onQueryTextChange(String s) {
            EventBus.getDefault().post(new SearchQueryEvent(s));
            return false;
        }
    });
    return true;

}

YourFragment.java

@Override
public void onResume() {
    super.onResume();
    EventBus.getDefault().register(this);
}

@Override
public void onPause() {
    EventBus.getDefault().unregister(this);
    super.onPause();
}

@Subscribe(threadMode = ThreadMode.MAIN)
public void onSearchQuery(SearchQueryEvent event) {
    String query=event.getQuery();
    adapter.getFilter().filter(query);
}

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