Android 代码中的 NullPointerException [英] NullPointerException in Android code

问题描述

错误是:

java.lang.NullPointerException.onCreateOptionsMenu(AddMyMarketsActivity.java:44)

我的代码是:

41 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
42          SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
43          SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView();       
44          searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
            Log.i("searchView", "set searchable configuration for searchView ");

我的代码可能有什么问题?

What could be the problem with my code?

推荐答案

如果您使用 androids support libary 来显示您的操作栏，请确保您在 SearchView 声明中使用正确的 actionViewClass.

If you're using androids support libary to display your action bar, be sure you use the right actionViewClass in your SearchView declaration.

应该是 app:actionViewClass="android.support.v7.widget.SearchView".

之后，您可以将其用作尝试获取 ActionView 的代码的替代品:

After that you can use as replacement for your code trying to get the ActionView:

MenuItem searchItem = menu.findItem(R.id.search_view);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);

在调用之前一定要调用 getMenuInfalter().inflate(...) .

Be sure to call getMenuInfalter().inflate(...) before calling this.

更多信息:http://developer.android.com/guide/topics/ui/actionbar.html#ActionView

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