Java tutorial
/* * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package by.onliner.news.activity; import android.content.Intent; import android.os.Bundle; import android.os.StrictMode; import android.support.design.widget.NavigationView; import android.support.design.widget.TabLayout; import android.support.v4.view.GravityCompat; import android.support.v4.view.ViewPager; 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.Gravity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import com.squareup.picasso.Picasso; import by.onliner.news.adapters.ViewPagerAdapter; import by.onliner.news.App; import by.onliner.news.fragments.tabs.TabBase; import by.onliner.news.R; import by.onliner.news.structures.user.User; import by.onliner.news.transforms.CircleTransform; /** * */ public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, DrawerLayout.DrawerListener { // Views private NavigationView mNavigationView; private DrawerLayout mDrawerLayout; private Button mButtonAuth; private Button mButtonLogout; private ImageView mImageViewNavBarAvatar; private TextView mTextViewNavBarUsername; private ViewPager mPager; private ViewPagerAdapter mAdapter; private TabLayout mTabs; private CharSequence mTitles[]; private final static int Numboftabs = 4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); mDrawerLayout.addDrawerListener(toggle); mDrawerLayout.addDrawerListener(this); toggle.syncState(); mNavigationView = (NavigationView) findViewById(R.id.nav_view); mNavigationView.setNavigationItemSelectedListener(this); View headerNavigationView = mNavigationView.getHeaderView(0); mButtonAuth = (Button) headerNavigationView.findViewById(R.id.bt_auth_account); mButtonAuth.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mDrawerLayout.closeDrawer(Gravity.LEFT); Intent intent = new Intent(App.getContext(), AuthActivity.class); startActivity(intent); } }); mButtonLogout = (Button) headerNavigationView.findViewById(R.id.bt_logout_account); mButtonLogout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mDrawerLayout.closeDrawer(Gravity.LEFT); App.logoutUser(); updateNavBarLoginInfo(); } }); mImageViewNavBarAvatar = (ImageView) headerNavigationView.findViewById(R.id.img_nav_header_avatar); mTextViewNavBarUsername = (TextView) headerNavigationView.findViewById(R.id.tv_nav_bar_username); updateNavBarLoginInfo(); mTitles = new CharSequence[] { getString(R.string.tabAuto), getString(R.string.tabPeoples), getString(R.string.tabRealt), getString(R.string.tabTechnologies) }; mAdapter = new ViewPagerAdapter(getSupportFragmentManager(), mTitles, Numboftabs); mPager = (ViewPager) findViewById(R.id.pager_news_list); mPager.setOffscreenPageLimit(1); mPager.setAdapter(mAdapter); mTabs = (TabLayout) findViewById(R.id.tabs_news_list); mTabs.setupWithViewPager(mPager); } @Override public void onBackPressed() { int count = getFragmentManager().getBackStackEntryCount(); if (count == 0) super.onBackPressed(); else getFragmentManager().popBackStack(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_refresh: int index = mPager.getCurrentItem(); ViewPagerAdapter adapter = ((ViewPagerAdapter) mPager.getAdapter()); TabBase fragment = adapter.getFragment(index); fragment.loadingNews(false, true); break; default: break; } return true; } @SuppressWarnings("StatementWithEmptyBody") @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); switch (id) { case R.id.nav_camera: case R.id.nav_gallery: case R.id.nav_slideshow: case R.id.nav_manage: break; case R.id.nav_favorite: { Intent intent = new Intent(this, FavoriteNewsActivity.class); startActivity(intent); break; } default: break; } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } @Override public void onDrawerSlide(View drawerView, float slideOffset) { } @Override public void onDrawerOpened(View drawerView) { updateNavBarLoginInfo(); } @Override public void onDrawerClosed(View drawerView) { } @Override public void onDrawerStateChanged(int newState) { } public void updateNavBarLoginInfo() { User user = App.getLoggedUser(); if (user == null) { mImageViewNavBarAvatar.setImageResource(R.drawable.ic_profile_user); mTextViewNavBarUsername.setVisibility(View.GONE); mTextViewNavBarUsername.setText(""); mButtonAuth.setVisibility(View.VISIBLE); mButtonLogout.setVisibility(View.GONE); } else { Picasso.with(this).load(App.getLoggedUser().getAvatar().getUrlLarge()).transform(new CircleTransform()) .error(R.drawable.ic_broken_image).into(mImageViewNavBarAvatar); mTextViewNavBarUsername.setVisibility(View.VISIBLE); mTextViewNavBarUsername.setText(App.getLoggedUser().getUsername()); mButtonAuth.setVisibility(View.GONE); mButtonLogout.setVisibility(View.VISIBLE); } } }