I have been trying to build a searchable interface in this app for a while, and I've been using a lot of the Android developer guides to help, but I recently ran into this error to do with SearchView and OnQueryTextListener that I do not know how to resolve, but it is stopping my app from running.
Here is my MainActivity:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.overflow, menu);
MenuItem searchItem = menu.findItem(R.id.search);
SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setOnQueryTextListener((OnQueryTextListener) searchView);
//this is where the program crashes
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchableInfo info = searchManager.getSearchableInfo(getComponentName());
searchView.setSearchableInfo(info);
return true;
}
public boolean onQueryTextSubmit(String query) {
// User pressed the search button
return false;
}
public boolean onQueryTextChange(String newText) {
// User changed the text
return false;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.constants:
startActivity(new Intent(MainActivity.this, FundamentalPhysicalConstants.class));
return true;
case R.id.joes_rules:
//go to rules
return true;
case R.id.home:
//Go back to the home screen
return true;
case R.id.search:
//open search
return true;
default:
// If we got here, the user's action was not recognized.
// Invoke the superclass to handle it.
return super.onOptionsItemSelected(item);
}
}
}
Here is my SearchableActivity:
public class SearchableActivity extends ListActivity {
DatabaseTable db= new DatabaseTable(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_searchable);
// get the intent sent when user searches from search widget, verify the action and exxtract what is typed in
Intent intent = getIntent();
handleIntent(intent);
}
public void onNewIntent(Intent intent) {
setIntent(intent);
handleIntent(intent);
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
Cursor c = db.getWordMatches(query, null);
//still need to process Cursor and display results
}
}
public void onListItemClick(ListView l,
View v, int position, long id) {
// call detail activity for clicked entry
}
private void doSearch(String queryStr) {
// get a Cursor, prepare the ListAdapter
// and set it
}
}
Here is my searchable.xml:
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/app_name"
android:hint="@string/search_hint">
</searchable>
Here is my logcat:
06-08 14:57:09.581 28388-28388/com.gmd.referenceapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.gmd.referenceapplication, PID: 28388
java.lang.ClassCastException: android.support.v7.widget.SearchView cannot be cast to android.support.v7.widget.SearchView$OnQueryTextListener
at com.gmd.referenceapplication.MainActivity.onCreateOptionsMenu(MainActivity.java:55)
at android.app.Activity.onCreatePanelMenu(Activity.java:2846)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:340)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:258)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:454)
at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:61)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I have tried to do a lot of research on this, and I haven't had any luck. I would be extremely grateful for any help on this matter, thanks.
This line is just wrong:
searchView.setOnQueryTextListener((OnQueryTextListener) searchView);
You cannot cast the searchView
into OnQueryTextListener
. Instead give it a proper parameter as an anonymous class like this:
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
//your logic
}
@Override
public boolean onQueryTextChange(String newText) {
//your logic
}
});
I now see that you have tried to add these two methods in your Activity, which is not the proper way to do it. You either need to create your custom class that implements this SearchView.OnQueryTextListener
interface, and then say:
searchView.setOnQueryTextListener(new MyClassThatImplementsTheInterface);
Or do it the way above that I gave you as the first solution. That is the more common way of doing this, using anonymous classes.