Java tutorial
package com.work.nishant.publicchannel; import android.annotation.SuppressLint; import android.app.AlertDialog; import android.app.ProgressDialog; import android.app.TabActivity; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Color; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.AsyncTask; import android.os.Bundle; import android.os.StrictMode; import android.support.design.widget.CoordinatorLayout; import android.support.design.widget.NavigationView; import android.support.design.widget.Snackbar; import android.support.design.widget.TabLayout; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.content.ContextCompat; import android.support.v4.view.GravityCompat; import android.support.v4.view.PagerAdapter; 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.text.Html; import android.text.Layout; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.webkit.WebView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TabHost; import android.widget.TextView; import android.widget.Toast; import com.facebook.*; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; import java.net.URL; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; @SuppressWarnings("deprecation") public class StartHere extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { TextView na, sap, roll, bch, em; ImageView im; SharedPreferences sp, co; SharedPreferences.Editor ed, eco; TabHost tb; TabHost.TabSpec tab1, tab2, tab3, tab4; String imageUri = null; Bitmap bm = null; Connection con; PreparedStatement ps; ResultSet rs; //change here as version changes int versionControl = 2; int versionReceived = 0; int versionMsg = 0; String updateMsg = ""; boolean executedOnce = false; //change here as version changes TabLayout tabLayout; ViewPager viewPager; ImageLoader imageLoader; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_start_here); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).build(); ImageLoader.getInstance().init(config); Toolbar toolbars = (Toolbar) findViewById(R.id.tab_anim); setSupportActionBar(toolbars); viewPager = (ViewPager) findViewById(R.id.viewPager); viewPager.setAdapter(new CustomAdapter(getSupportFragmentManager(), getApplicationContext())); tabLayout = (TabLayout) findViewById(R.id.tabLayout); tabLayout.setupWithViewPager(viewPager); //internetConnection(); tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { @Override public void onTabSelected(TabLayout.Tab tab) { viewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(TabLayout.Tab tab) { viewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabReselected(TabLayout.Tab tab) { viewPager.setCurrentItem(tab.getPosition()); } }); na = (TextView) findViewById(R.id.textViewName); sap = (TextView) findViewById(R.id.textViewSapId); roll = (TextView) findViewById(R.id.textViewRollNo); bch = (TextView) findViewById(R.id.textViewBranch); em = (TextView) findViewById(R.id.textViewEmail); im = (ImageView) findViewById(R.id.imageViewSlider); sp = getApplicationContext().getSharedPreferences("shared", 0); ed = sp.edit(); co = getApplicationContext().getSharedPreferences("cortas", 0); eco = co.edit(); if (sp.getString("facebook", "no").contentEquals("yes")) { imageUri = sp.getString("imageUri", "null"); //new Get().execute(); /* https://graph.facebook.com/1061026247265354/picture?height=400&width=400&migration_overrides=%7Boctober_2012%3Atrue%7D */ imageUri = imageUri.replace("height=400&width=400", "height=100&width=100"); imageLoader = ImageLoader.getInstance(); imageLoader.displayImage(imageUri, im); } na.setText(sp.getString("name", "N/A")); sap.setText(sp.getString("sapid", "N/A")); roll.setText(sp.getString("roll", "N/A")); bch.setText(sp.getString("branch", "N/A")); em.setText(sp.getString("email", "N/A")); DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbars, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawer.setDrawerListener(toggle); toggle.syncState(); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.setNavigationItemSelectedListener(this); } @Override public void onBackPressed() { DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); if (drawer.isDrawerOpen(GravityCompat.START)) { drawer.closeDrawer(GravityCompat.START); } else { super.onBackPressed(); } } //Work here for all clicks @SuppressWarnings("StatementWithEmptyBody") @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); if (id == R.id.nav_editProfile) { Intent it = new Intent(StartHere.this, Profile.class); startActivity(it); } else if (id == R.id.nav_fb) { sp = getApplicationContext().getSharedPreferences("shared", 0); ed = sp.edit(); if (sp.getString("facebook", "no").contentEquals("yes")) { Intent it = new Intent(StartHere.this, FbDone.class); startActivity(it); } else { Intent it = new Intent(StartHere.this, FbLogin.class); startActivity(it); } } else if (id == R.id.nav_Skill) { Intent it = new Intent(StartHere.this, SkillPost.class); startActivity(it); } else if (id == R.id.nav_developer) { Intent it = new Intent(StartHere.this, AboutMe.class); startActivity(it); } else if (id == R.id.nav_Attendance) { Intent it = new Intent(StartHere.this, Attendance.class); startActivity(it); } else if (id == R.id.nav_share) { try { Intent i = new Intent(Intent.ACTION_SEND); i.setType("text/plain"); i.putExtra(Intent.EXTRA_SUBJECT, "Public Channel"); String sAux = "\nAn android app for UPES students to check their attendance, timetable and search other students\n\n"; sAux = sAux + "https://play.google.com/store/apps/details?id=com.work.nishant.publicchannel \n\n"; i.putExtra(Intent.EXTRA_TEXT, sAux); startActivity(Intent.createChooser(i, "choose one")); } catch (Exception e) { //e.toString(); } } else if (id == R.id.nav_logout) { ed.clear(); ed.commit(); eco.clear(); eco.commit(); Intent it = new Intent(StartHere.this, MainActivity.class); startActivity(it); finish(); } else if (id == R.id.nav_opensource) { WebView view = (WebView) LayoutInflater.from(this).inflate(R.layout.license, null); view.loadUrl("file:///android_asset/open.html"); view.getSettings().setUseWideViewPort(true); view.getSettings().setBuiltInZoomControls(true); AlertDialog.Builder mAlertDialog = new AlertDialog.Builder(this, R.style.Theme_AppCompat_Light_Dialog_Alert).setTitle("Open Source License").setView(view) .setPositiveButton(android.R.string.ok, null); AlertDialog alert = mAlertDialog.create(); alert.show(); } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } class Get extends AsyncTask<Void, Void, Void> { @Override protected Void doInBackground(Void... params) { return null; } @Override protected void onPostExecute(Void aVoid) { if (imageUri == null || imageUri.isEmpty()) { //default pic } else if (bm != null) im.setImageBitmap(bm); } } private class CustomAdapter extends FragmentPagerAdapter { private String fragments[] = { "Cortas", "Search", "Skill Search", "Most Searched Students" }; public CustomAdapter(FragmentManager supportFragmentManager, Context applicationContext) { super(supportFragmentManager); } @Override public Fragment getItem(int position) { switch (position) { case 0: return new oneCortas(); case 1: return new oneSearch(); case 2: return new oneSkill(); case 3: return new oneMost(); default: return null; } } @Override public int getCount() { return fragments.length; } @Override public CharSequence getPageTitle(int position) { return fragments[position]; } } }