void android.support.v7.widget.SearchView.setOnQueryTextListener(android.support.v7.widget.SearchView$OnQueryTextListener)

Question

I am doing SearchView on CustomAdapter where it will search Gate Name. After i try run the app, it suddenly crash and give me the error as stated above. I do not know which part did i even do wrong that cause this issue to appear everytime i try to run my app.

MainActivity.java

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    getMenuInflater().inflate(R.menu.main_menu, menu);

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

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            List<Gate> gateSearchList = new ArrayList<Gate>();

            for (Gate gate : gateList) {
                if (gate.getGateName().toLowerCase().contains(newText.toLowerCase())) {
                    gateSearchList.add(gate);
                }
            }

            adapter = new GateAdapter(MainActivity.this, gateSearchList);
            lv.setAdapter(adapter);
            return true;
        }
    });

    return super.onCreateOptionsMenu(menu);
}
 @Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.action_logout) {
        logout();
    }
    return super.onOptionsItemSelected(item);
}

main_menu.xml

 <item
    android:id="@+id/item_search"
    android:icon="@drawable/ic_action_search"
    android:actionViewClass="android.support.v7.widget.SearchView"
    app:showAsAction="ifRoom|collapseActionView"
    android:title="Search">

</item>
<item android:id="@+id/action_logout"
    android:title="Log Out"
    app:showAsAction="never"/>

This is the error message in logcat:

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

It also indicate that the error also came from this line of code:

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

I hope someone can be able to provide me the solution to solve my issue.

Answer 1

Change your android:actionViewClass to app:actionViewClass, because you are using SearchView from support lib

<item
    android:id="@+id/item_search"
    android:icon="@drawable/ic_action_search"
    app:actionViewClass="android.support.v7.widget.SearchView"
    app:showAsAction="ifRoom|collapseActionView"
    android:title="Search">

Answer 2

Posting this here for others who might face the similar issue.

Following up Jasmin John's Point I Have solved the issue with pro-guard rule by adding

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