Nullpointerexception 仅在已签名的 APK 中

Nullpointerexception only in signed APK

我有一个包含以下代码的片段:

SearchView searchView;

    @Override
    public void onCreateOptionsMenu(final Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.searchship, menu);

        MenuItem searchItem = menu.findItem(R.id.action_search);

        searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
        searchView.setOnSearchClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    menu.findItem(R.id.action_sort).setVisible(false);

            }
        });

如果我 运行 来自 AndroidStudio,那么一切都很好。但是从 playstore 下载该应用程序的每个人都崩溃了:

 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setOnSearchClickListener(android.view.View$OnClickListener)' on a null object reference

这是我发现的:

我要补充

-keep class android.support.v7.widget.SearchView { *; }

到proguard.pro

下面的代码有效

-keep class android.support.v7.widget.SearchView { *; }