Question

我正在恢复以前开发的旧应用程序，并且解决了一些问题。我目前面临的是：

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

当然，这是因为对getActionView（）的previos调用返回null。我试图更新依赖项，但没有任何效果。

这是我尝试运行的代码：

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

    final MenuItem searchItem = menu.findItem(R.id.search);
    et = (SearchView) searchItem.getActionView();
    et.setOnQueryTextFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub
            if (hasFocus) {
            }
        }
    });
    et.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextChange(String newText) {
            expListAdapter.getFilter().filter(newText);
            cmAdapter.getFilter().filter(newText);
            allAdapter.getFilter().filter(newText);
            playlistAdapter.getFilter().filter(newText);
            return false;
        }

        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }
    });
    return true;
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto" >

    <item android:title="Shuffle All"
          android:icon="@drawable/ic_action_shuffle"
          android:id="@+id/shuffle"
        android:orderInCategory="2"
        app:showAsAction="always" />

    <item android:id="@+id/search"
          android:title="@string/search_hint"
          android:icon="@drawable/ic_action_search"
        android:orderInCategory="1"
        app:showAsAction="collapseActionView|always"
        app:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

错误：searchItem.getActionView（）返回空对象

0 个答案: