title: Loading cache in offline mode in Android Webview
body: <p>I found a code that should check wether the application is offline and has to load the cache or when in online mode and has to load url. This is the code I used for that:</p>
  
  <pre><code>ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Activity.CONNECTIVITY_SERVICE);
  String weblink = "http://www.google.com";
  if(cm.getActiveNetworkInfo().isConnected()){
      myWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
      myWebView.loadUrl(weblink);
  } else {
      myWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
      myWebView.loadUrl(weblink);
  }
  </code></pre>
  
  <p>And these are my permissions:</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.INTERNET"/&gt;
  &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/&gt;
  &lt;uses-permission android:name="android.permisson.ACCESS_WIFI_STATE"/&gt;
  </code></pre>
  
  <p>My problem: When I'm in airplane mode or my connections are off. The app force closes. When I'm online the app just loads and acts normal... What did I wrong?</p>
  
  <p>This is my logcat:</p>
  
  <pre><code>11-22 10:09:40.310: E/AndroidRuntime(323): FATAL EXCEPTION: main
  11-22 10:09:40.310: E/AndroidRuntime(323): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.martijngijselaar.rooster/com.martijngijselaar.rooster.SaxionRoosterActivity}: java.lang.NullPointerException
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.os.Handler.dispatchMessage(Handler.java:99)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.os.Looper.loop(Looper.java:123)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread.main(ActivityThread.java:4627)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at java.lang.reflect.Method.invokeNative(Native Method)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at java.lang.reflect.Method.invoke(Method.java:521)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at dalvik.system.NativeStart.main(Native Method)
  11-22 10:09:40.310: E/AndroidRuntime(323): Caused by: java.lang.NullPointerException
  11-22 10:09:40.310: E/AndroidRuntime(323):  at com.martijngijselaar.rooster.SaxionRoosterActivity.onCreate(SaxionRoosterActivity.java:34)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  11-22 10:09:40.310: E/AndroidRuntime(323):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
  11-22 10:09:40.310: E/AndroidRuntime(323):  ... 11 more
  </code></pre>
  
  <p>Okay to make it more easier here is the whole code:</p>
  
  <pre><code>package com.martijngijselaar.rooster;
  
  import android.app.Activity;
  import android.net.ConnectivityManager;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.Window;
  import android.webkit.WebSettings;
  import android.webkit.WebView;
  import android.webkit.WebViewClient;
  
  public class SaxionRoosterActivity extends Activity {
      private static final int MENU1 = Menu.FIRST;
      private static final int MENU2 = Menu.FIRST + 1;
      private static final int MENU3 = Menu.FIRST + 2;
  
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  
          setContentView(R.layout.main);
          WebView myWebView = (WebView) findViewById(R.id.webview);
          myWebView.setWebViewClient(new WebViewClient());
  
          // Checken of er een connectie is, zo niet dan de chache laden, zo wel dan gewoon het netwerk laden!!
          ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Activity.CONNECTIVITY_SERVICE);
          String weblink = "http://google.com/";
          if(cm.getActiveNetworkInfo().isConnected()){
              myWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
              myWebView.loadUrl(weblink);
          } else {
              myWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
              myWebView.loadUrl(weblink);
          }
  
          // Zorgen dat je input kunt gebruiken in de webview
          myWebView.requestFocus(View.FOCUS_DOWN);
          myWebView.setOnTouchListener(new View.OnTouchListener() {
              public boolean onTouch(View v, MotionEvent event) {
                  switch (event.getAction()) {
                      case MotionEvent.ACTION_DOWN:
                      case MotionEvent.ACTION_UP:
                          if (!v.hasFocus()) {
                              v.requestFocus();
                          }
                          break;
                  }
                  return false;
              }
  
          });
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          menu.add(0, MENU1, 0, "Wijzig klas");
          menu.add(0, MENU2, 0, "Disclaimer");
          menu.add(0, MENU3, 0, "Sluiten");
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          WebView myWebView = (WebView) findViewById(R.id.webview);
          switch (item.getItemId()) {
          case MENU1:
              myWebView.loadUrl("http://google.nl");
              return true;
          case MENU2:
              myWebView.loadUrl("http://google.nl");
              return true;
          case MENU3:
              finish();
              return true;
          }
          return false;
      }
  }
  </code></pre>