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POLoading cache in offline mode in Android Webview
 

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  1. POLoading cache in offline mode in Android Webview
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    <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>
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    1. COPost error log here.
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    2. COand specify what is the line `SaxionRoosterActivity.java:34` please
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    3. COWhat's the code at Line 34?
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