将事件侦听器与来自其他 class android 的上下文一起使用

Question

我正在尝试使用在 searchview 折叠或展开时执行的 Searchview Class。由于我是编程新手，所以我不太了解如何在 MainActivity class 中使用 searchview class。我已经试过了，但是下面的 Toast 没有显示：

MainActivity.java:

MySearchView mySearchView = new MySearchView(searchView.getContext());  // I think the problem is in this line...

        mySearchView.setOnSearchViewCollapsedEventListener(new MySearchView.OnSearchViewCollapsedEventListener() {
            @Override
            public void onSearchViewCollapsed() {
                Toast.makeText(MainActivity.this, "YES, IT'S WORKING", Toast.LENGTH_SHORT).show();
            }
        });

MySearchView.java:

 public class MySearchView extends SearchView {
    
        OnSearchViewCollapsedEventListener mSearchViewCollapsedEventListener;
        OnSearchViewExpandedEventListener mOnSearchViewExpandedEventListener;
    
        public MySearchView(Context context) {
            super(context);
        }
    
        @Override
        public void onActionViewCollapsed() {
            if (mSearchViewCollapsedEventListener != null)
                mSearchViewCollapsedEventListener.onSearchViewCollapsed();
            super.onActionViewCollapsed();
        }
    
        @Override
        public void onActionViewExpanded() {
            if (mOnSearchViewExpandedEventListener != null)
                mOnSearchViewExpandedEventListener.onSearchViewExpanded();
            super.onActionViewExpanded();
        }
    
        public interface OnSearchViewCollapsedEventListener {
            public void onSearchViewCollapsed();
        }
    
        public interface OnSearchViewExpandedEventListener {
            public void onSearchViewExpanded();
        }
    
        public void setOnSearchViewCollapsedEventListener(OnSearchViewCollapsedEventListener eventListener) {
            mSearchViewCollapsedEventListener = eventListener;
        }
    
        public void setOnSearchViewExpandedEventListener(OnSearchViewExpandedEventListener eventListener) {
            mOnSearchViewExpandedEventListener = eventListener;
        }

}

有人能帮帮我吗？感谢您的帮助！

Answer 1

您可以将 MySeachView 直接添加到您的布局中

<your.package.name.MySearchView
    android:id="@+id/my_search_view"
...
/>
</your.package.name.MySearchView>

并在您的 MainActivity 中使用 findViewById(R.id.my_search_view) 获取它。

在此你可以设置你的监听器。

将事件侦听器与来自其他 class android 的上下文一起使用

Use event listener with context from other class android

methods

android

event-listener

searchview