Java tutorial
package com.github.blalasaadri.sprinttopics; import android.app.Fragment; import android.app.FragmentManager; import android.app.SearchManager; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; import butterknife.BindArray; import butterknife.BindView; import butterknife.ButterKnife; import static android.support.design.widget.Snackbar.LENGTH_LONG; import static android.widget.Toast.makeText; import static com.github.blalasaadri.sprinttopics.ErrorFragment.ERROR_MESSAGE_ARG; import static com.github.blalasaadri.sprinttopics.NurseryRhymeFragment.NURSERY_RHYME_ARGUMENT; import static com.github.blalasaadri.sprinttopics.NurseryRhymeFragment.NurseryRhymeSelection.NEW; import static com.github.blalasaadri.sprinttopics.NurseryRhymeFragment.NurseryRhymeSelection.OLD; public class MainActivity extends AppCompatActivity { @BindView(R.id.drawer_layout) DrawerLayout mDrawerLayout; @BindView(R.id.left_drawer) ListView mDrawerList; @BindView(R.id.toolbar) Toolbar toolbar; @BindArray(R.array.navigation_list_items) String[] navigationListItems; @BindArray(R.array.navigation_list_ids) String[] navigationListIds; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.drawer_activity); ButterKnife.bind(this); setSupportActionBar(toolbar); mTitle = mDrawerTitle = getTitle(); // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener mDrawerList.setAdapter(new ArrayAdapter<>(this, R.layout.drawer_list_item, navigationListItems)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ //R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getSupportActionBar().setTitle(mTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getSupportActionBar().setTitle(mDrawerTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } }; mDrawerLayout.addDrawerListener(mDrawerToggle); if (savedInstanceState == null) { selectItem(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } /* Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // If the nav drawer is open, hide action items related to the content view boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action buttons switch (item.getItemId()) { case R.id.action_websearch: // create intent to perform web search for this planet Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); intent.putExtra(SearchManager.QUERY, getSupportActionBar().getTitle()); // catch event that there's no activity to handle intent if (intent.resolveActivity(getPackageManager()) != null) { startActivity(intent); } else { makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); } return true; default: return super.onOptionsItemSelected(item); } } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (position > navigationListItems.length) { Snackbar.make(view, R.string.nursery_rhyme_unknown, LENGTH_LONG).setAction("Action", null).show(); return; } selectItem(position); } } private void selectItem(int position) { // update the main content by replacing fragments Fragment fragment; Bundle args = new Bundle(); switch (navigationListIds[position]) { case "topics": fragment = new TopicsFragment(); break; case "new": fragment = new NurseryRhymeFragment(); args.putSerializable(NURSERY_RHYME_ARGUMENT, NEW); break; case "old": fragment = new NurseryRhymeFragment(); args.putSerializable(NURSERY_RHYME_ARGUMENT, OLD); break; case "licenses": fragment = new LicensesFragment(); break; default: // How did we land here? fragment = new ErrorFragment(); args.putInt(ERROR_MESSAGE_ARG, R.string.navigation_error); } fragment.setArguments(args); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(navigationListItems[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getSupportActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } }