I am able to change the background of a selected item in a listview. I want the first item's background highlighted when the list is created. The code below gives an error when I try to perform a "performItemClick".
I have seen suggestions to modify my getView in the array adapter. However, I get the error "no default construction in Android.widget.ArrayAdapter when I try to create the class MyCustomAdapter in my java code.
So, if I need to create an extention of my ArrayAdapter class to do this, how do I get around this error. If there is another way I am open to suggestions.
Thanks
package com.hofficer.aclsfast;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import java.lang.reflect.Array;
public class NarrowChild extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_narrow_child);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
//fix orientation
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
//MyCustomAdapter adapter = new MyCustomAdapter();
createList();
}
/*
class MyCustomAdapter extends ArrayAdapter{
}*/
void createList(){
String[] narrowChoices = {"aFib/Flutter", "Narrow Cmplx Tachycardia", "PSVT", "Junctional Tachycardia", "Multifocal Tachycardia"};
ListAdapter theAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, narrowChoices);
final ListView listview = (ListView) findViewById(R.id.narrowListView);
listview.setAdapter(theAdapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
//clear menu and highlight selected item
for (int i = 0; i < 5; i++) {
listview.getChildAt(i).setBackgroundColor(Color.WHITE);
}
listview.getChildAt(position).setBackgroundColor(Color.CYAN);
}
});
Boolean result = listview.performItemClick(listview,0,0); //THIS GIVES ERROR NULL POINT EXCEPTION
}
}