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我試圖使自定義列表視圖進行搜索,但我得到了一些麻煩與NullPointerException異常我怎麼解決的ListView的NullPointerException在搜索查看
中存在line76錯誤,logcat的:
java.lang.NullPointerException
at com.aeu.mlibrary.mlibraryaeu.SearchFragment.onCreateOptionsMenu(SearchFragment.java:76)
當我在第76行這檢查是代碼:
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.activity_main_actions, menu);
MenuItem myActionMenuItem = menu.findItem(R.id.item_search);
final SearchView searchView = (SearchView) myActionMenuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
adapter.filter("");
lvSearch.clearTextFilter();
} else {
adapter.filter(newText);
}
return true;
}
});
super.onCreateOptionsMenu(menu, inflater);
}
線76:
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
,這是我menu.xml文件:
<item android:id="@+id/itemSearch"
android:actionViewClass="android.widget.SearchView"
android:icon="@mipmap/ic_search_white_48dp"
android:title="@string/action_search"
app:showAsAction="ifRoom" />
我需要你的幫助傢伙!
更改這一行項目屬性:應用程序:showAsAction = 「ifRoom | collapseActionView」 應用:actionViewClass = 「android.support.v7.widget.SearchView」 – Rajan1404930
@ Rajan1404930我嘗試它,然後我有一個新的logcat: – Onosibiw
@ Rajan1404930'java.lang.ClassCastException:android.widget.SearchView無法轉換爲android.support.v7.widget.SearchView at com.aeu.mlibrary.mlibraryaeu.SearchFragment.onCreateOptionsMenu(SearchFragment.java:76)' – Onosibiw