add cashing and refresh button

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.tysox.bs_elmshorn">
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
 
     <application
         android:allowBackup="true"

app/src/main/java/de/tysox/bs_elmshorn/MainActivity.java

@@ -1,7 +1,11 @@
 package de.tysox.bs_elmshorn;
 
+import android.graphics.Typeface;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.Handler;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
@@ -12,11 +16,18 @@ import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.view.View;
 import android.view.Window;
+import android.webkit.WebView;
+import android.widget.TextView;
+
+import java.util.Calendar;
+
 
 public class MainActivity extends AppCompatActivity {
 
     private static MainActivity instance;
+    private int currentWeek;
 
     /**
      * The {@link android.support.v4.view.PagerAdapter} that will provide
@@ -39,17 +50,21 @@ public class MainActivity extends AppCompatActivity {
         setContentView(R.layout.activity_main);
         instance = this;
 
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        Calendar calendar = Calendar.getInstance();
+
+        currentWeek = calendar.get(Calendar.WEEK_OF_YEAR);
+
+        Toolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
         // Create the adapter that will return a fragment for each of the three
         // primary sections of the activity.
         mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
 
         // Set up the ViewPager with the sections adapter.
-        mViewPager = (ViewPager) findViewById(R.id.container);
+        mViewPager = findViewById(R.id.container);
         mViewPager.setAdapter(mSectionsPagerAdapter);
 
-        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
+        TabLayout tabLayout = findViewById(R.id.tabs);
 
         mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
         tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
@@ -62,11 +77,50 @@ public class MainActivity extends AppCompatActivity {
 
     }
 
-
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.menu_main, menu);
+
+        Handler handler = new Handler();
+        handler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                final TextView refresh = findViewById(R.id.refresh);
+                final TextView left = findViewById(R.id.left);
+                final TextView right = findViewById(R.id.right);
+                Typeface font = Typeface.createFromAsset(getBaseContext().getAssets(), "font/fontawesome.ttf");
+                refresh.setTypeface(font);
+                right.setTypeface(font);
+                left.setTypeface(font);
+                refresh.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View view) {
+                        WebView webView = findViewById(R.id.timetable);
+                        webView.reload();
+                    }
+                });
+                right.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View view) {
+                        WebView webView = findViewById(R.id.timetable);
+                        currentWeek++;
+                        webView.loadUrl("http://www.bs-elmshorn.de/Stundenplan/Schueler/" + currentWeek + "/c/c00018.htm");
+
+                    }
+                });
+                left.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View view) {
+                        WebView webView = findViewById(R.id.timetable);
+                        currentWeek--;
+                        webView.loadUrl("http://www.bs-elmshorn.de/Stundenplan/Schueler/" + currentWeek + "/c/c00018.htm");
+
+                    }
+                });
+            }
+        }, 100);
+
         return true;
     }
 
@@ -78,10 +132,9 @@ public class MainActivity extends AppCompatActivity {
         int id = item.getItemId();
 
         //noinspection SimplifiableIfStatement
-        if (id == R.id.action_settings) {
+        /*if (id == R.id.action_settings) {
             return true;
-        }
+        }*/
-
         return super.onOptionsItemSelected(item);
     }
 
@@ -97,6 +150,9 @@ public class MainActivity extends AppCompatActivity {
 
         @Override
         public Fragment getItem(int position) {
+            final TextView refresh = MainActivity.getInstance().findViewById(R.id.refresh);
+            final TextView left = MainActivity.getInstance().findViewById(R.id.left);
+            final TextView right = MainActivity.getInstance().findViewById(R.id.right);
             switch (position) {
                 case 0:
                     Tab1 tab1 = new Tab1();
@@ -119,6 +175,12 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    public boolean isNetworkAvailable() {
+        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService( CONNECTIVITY_SERVICE );
+        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
+        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
+    }
+
     public static MainActivity getInstance() {
         return instance;
     }

app/src/main/java/de/tysox/bs_elmshorn/Tab1.java

@@ -6,8 +6,10 @@ import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
+import android.widget.TextView;
 
 import java.util.Calendar;
 
@@ -26,26 +28,62 @@ public class Tab1 extends Fragment {
         View rootView = inflater.inflate(R.layout.tab1, container, false);
 
         Handler handler = new Handler();
-
         handler.postDelayed(new Runnable() {
             @Override
             public void run() {
                 WebView webView= (WebView) MainActivity.getInstance().findViewById(R.id.timetable);
                 webView.setWebViewClient(new WebViewClient());
+                webView.getSettings().setAppCacheMaxSize( 5 * 1024 * 1024 ); // 5MB
+                webView.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
+
+                webView.getSettings().setAppCachePath( MainActivity.getInstance().getApplicationContext().getCacheDir().getAbsolutePath() );
+                webView.getSettings().setAllowFileAccess( true );
+                webView.getSettings().setAppCacheEnabled( true );
                 webView.getSettings().setJavaScriptEnabled(true);
                 webView.setVerticalScrollBarEnabled(false);
                 webView.setHorizontalScrollBarEnabled(false);
+                webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
+
+                if(!MainActivity.getInstance().isNetworkAvailable()) {
+                    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
+                }
+
                 Calendar calendar = Calendar.getInstance();
 
                 currentWeek = calendar.get(Calendar.WEEK_OF_YEAR);
 
                 webView.loadUrl("http://www.bs-elmshorn.de/Stundenplan/Schueler/"+currentWeek+"/c/c00018.htm");
-                // s5 mini 119 opx 170
+                // s5 mini 119 opx 170 xperia 113
-                webView.setInitialScale(119);
+                webView.setInitialScale(170);
             }
-        },100);
+        },101);
 
 
         return rootView;
     }
+
+    @Override
+    public void setUserVisibleHint(boolean isVisibleToUser) {
+        super.setUserVisibleHint(isVisibleToUser);
+        final TextView refresh = MainActivity.getInstance().findViewById(R.id.refresh);
+        final TextView left = MainActivity.getInstance().findViewById(R.id.left);
+        final TextView right = MainActivity.getInstance().findViewById(R.id.right);
+        if (isVisibleToUser) {
+            try {
+                refresh.setVisibility(View.VISIBLE);
+                left.setVisibility(View.VISIBLE);
+                right.setVisibility(View.VISIBLE);
+            } catch (Exception ex) {
+
+            }
+        } else {
+            try {
+                refresh.setVisibility(View.INVISIBLE);
+                left.setVisibility(View.INVISIBLE);
+                right.setVisibility(View.INVISIBLE);
+            } catch (Exception ex) {
+
+            }
+        }
+    }
 }

app/src/main/java/de/tysox/bs_elmshorn/Tab2.java

@@ -6,11 +6,10 @@ import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
-import java.util.Calendar;
-
 /**
  * Created by Jan on 16.09.2017.
  */
@@ -22,23 +21,30 @@ public class Tab2 extends Fragment {
                              Bundle savedInstanceState) {
         View rootView = inflater.inflate(R.layout.tab2, container, false);
         Handler handler = new Handler();
-
         handler.postDelayed(new Runnable() {
             @Override
             public void run() {
                 WebView webView= (WebView) MainActivity.getInstance().findViewById(R.id.vt1);
                 webView.setWebViewClient(new WebViewClient());
+                webView.getSettings().setAppCacheMaxSize( 5 * 1024 * 1024 ); // 5MB
+                webView.getSettings().setAppCachePath( MainActivity.getInstance().getApplicationContext().getCacheDir().getAbsolutePath() );
+                webView.getSettings().setAllowFileAccess( true );
+                webView.getSettings().setAppCacheEnabled( true );
+                webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
                 webView.getSettings().setJavaScriptEnabled(true);
                 webView.setVerticalScrollBarEnabled(false);
                 webView.setHorizontalScrollBarEnabled(false);
 
+                if(!MainActivity.getInstance().isNetworkAvailable()) {
+                    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
+                }
+
+
                 webView.loadUrl("http://www.bs-elmshorn.de/Stundenplan/DSB/f1/subst_001.htm");
                 // s5 mini 100 opx 150
                 webView.setInitialScale(150);
             }
         },100);
-
-
         return rootView;
     }
 }

app/src/main/java/de/tysox/bs_elmshorn/Tab3.java

@@ -6,6 +6,7 @@ import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
@@ -19,18 +20,28 @@ public class Tab3 extends Fragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         View rootView = inflater.inflate(R.layout.tab3, container, false);
-
-
         Handler handler = new Handler();
+
         handler.postDelayed(new Runnable() {
             @Override
             public void run() {
-                WebView webView= (WebView) MainActivity.getInstance().findViewById(R.id.vt2);
+
+
+                WebView webView= MainActivity.getInstance().findViewById(R.id.vt2);
                 webView.setWebViewClient(new WebViewClient());
+                webView.getSettings().setAppCacheMaxSize( 5 * 1024 * 1024 ); // 5MB
+                webView.getSettings().setAppCachePath( MainActivity.getInstance().getApplicationContext().getCacheDir().getAbsolutePath() );
+                webView.getSettings().setAllowFileAccess( true );
+                webView.getSettings().setAppCacheEnabled( true );
+                webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
                 webView.getSettings().setJavaScriptEnabled(true);
                 webView.setVerticalScrollBarEnabled(false);
                 webView.setHorizontalScrollBarEnabled(false);
 
+                if(!MainActivity.getInstance().isNetworkAvailable()) {
+                    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
+                }
+
                 webView.loadUrl("http://www.bs-elmshorn.de/Stundenplan/DSB/f1/subst_002.htm");
                 // s5 mini 100 opx 150
                 webView.setInitialScale(150);

app/src/main/res/menu/menu_main.xml

@@ -1,10 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
-    xmlns:tools="http://schemas.android.com/tools"
+
-    tools:context="de.tysox.bs_elmshorn.MainActivity">
     <item
-        android:id="@+id/action_settings"
+        android:id="@+id/refresh"
-        android:orderInCategory="100"
+        android:actionViewClass="android.widget.TextView"
-        android:title="@string/action_settings"
+        android:title="@string/fa_refresh"
-        app:showAsAction="never" />
+        app:showAsAction="always"
+        />
+
+    <item
+        android:id="@+id/left"
+        android:actionViewClass="android.widget.TextView"
+        android:title="@string/fa_left"
+        app:showAsAction="always"
+        />
+
+    <item
+        android:id="@+id/right"
+        android:actionViewClass="android.widget.TextView"
+        android:title="@string/fa_right"
+        app:showAsAction="always" />
+
+
 </menu>

app/src/main/res/values/strings.xml

@@ -4,4 +4,7 @@
     <string name="tab_text_2">Vertretung 1</string>
     <string name="tab_text_3">Vertretung 2</string>
     <string name="action_settings">Settings</string>
+    <string name="fa_refresh">&#xf021;</string>
+    <string name="fa_left">&#xf060;</string>
+    <string name="fa_right">&#xf061;</string>
 </resources>