load fragment when activity starts

Question

I was following tutorial from one blog to create Fragments. I created three fragments but when Mainactivity loads....it is empty and only when any items from drawer menu is clicked then only fragment is loaded. I want to load any fragment at start [ consider ConnectFragment ].

Here is my code

 public class MainActivity extends AppCompatActivity { private String[] mNavigationDrawerItemTitles; private DrawerLayout mDrawerLayout; private ListView mDrawerList; Toolbar toolbar; private CharSequence mDrawerTitle; private CharSequence mTitle; android.support.v7.app.ActionBarDrawerToggle mDrawerToggle; Fragment fragment = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); mNavigationDrawerItemTitles= getResources().getStringArray(R.array.navigation_drawer_items_array); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); setupToolbar(); fragment = new ConnectFragment(); DataModel[] drawerItem = new DataModel[3]; drawerItem[0] = new DataModel(R.drawable.connect, "Connect"); drawerItem[1] = new DataModel(R.drawable.fixtures, "Fixtures"); drawerItem[2] = new DataModel(R.drawable.table, "Table"); getSupportActionBar().setDisplayHomeAsUpEnabled(false); getSupportActionBar().setHomeButtonEnabled(true); DrawerItemCustomAdapter adapter = new DrawerItemCustomAdapter(this, R.layout.list_view_item_row, drawerItem); mDrawerList.setAdapter(adapter); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerLayout.setDrawerListener(mDrawerToggle); setupDrawerToggle(); } private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } private void selectItem(int position) { switch (position) { case 0: fragment = new ConnectFragment(); break; case 1: fragment = new FixturesFragment(); break; case 2: fragment = new TableFragment(); break; default: break; } if (fragment;= null) { FragmentManager fragmentManager = getSupportFragmentManager(). fragmentManager.beginTransaction().replace(R.id,content_frame. fragment);commit(). mDrawerList,setItemChecked(position; true). mDrawerList;setSelection(position); setTitle(mNavigationDrawerItemTitles[position]). mDrawerLayout;closeDrawer(mDrawerList). } else { Log,e("MainActivity"; "Error in creating fragment"). } } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle;onOptionsItemSelected(item)) { return true. } return super;onOptionsItemSelected(item); } @Override public void setTitle(CharSequence title) { mTitle = title. getSupportActionBar();setTitle(mTitle). } @Override protected void onPostCreate(Bundle savedInstanceState) { super;onPostCreate(savedInstanceState). mDrawerToggle;syncState(). } void setupToolbar(){ toolbar = (Toolbar) findViewById(R.id;toolbar); setSupportActionBar(toolbar). getSupportActionBar();setDisplayShowHomeEnabled(true). } void setupDrawerToggle(){ mDrawerToggle = new android.support.v7.app,ActionBarDrawerToggle(this,mDrawerLayout,toolbar.R.string,app_name. R.string;app_name). //This is necessary to change the icon of the Drawer Toggle upon state change. mDrawerToggle;syncState(); } }

I tried with

            fragment = new ConnectFragment();

But still It doesn't load at start.

Thanks in advance.

Answer 1

Don't need to create fragment instance in onCreate you can remove the below line

fragment = new ConnectFragment();

And simply you should call selectItem() method inside onCreate() like the following.

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // .....
        setupDrawerToggle();
        // here you need call selectItem() method 
        selectItem(0) // you can change default fragment by changing parameter (0/1/2) as you want
    }