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POUnable to load webpage using WebView in Android
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  1. POUnable to load webpage using WebView in Android
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    copied!<p>I have recently taken up Android Development and I was looking to using the WebView display webpages. I picked up from the sample that was given on Google site and for some reason the emulator kept saying page was not available. I searched in StackOverflow and found links relating to WebViewClient. I tried that also but no luck there, I have checked multiple times about the manifest entry for internet permission and its there. As a test I ran the browser available within the emulator and sure enough my firewall popped up a question on whether to allow it access or not. The pop up never came to me when I was running it from program. The code that I have is what is there Google pages</p> <pre><code> mWebView = (WebView) findViewById(R.id.webview); mWebView.getSettings().setJavaScriptEnabled(true); mWebView.loadUrl("http://www.google.com"); mWebView.setWebViewClient(new HelloWebViewClient()); private class HelloWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } </code></pre> <p>I tried loading simple html directly using loadData and it worked fine. I am at loss as to what is happening and how this can be resolved. I would appreciate any help on this.</p> <p>Adding the Android Manifest here</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.hellowebview" android:versionCode="1" android:versionName="1.0"&gt; &lt;uses-sdk android:minSdkVersion="8" /&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;activity android:name=".HelloWebView" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>To check if its just a WebView thingy, I tried accessing the internet using httpGet and httpResonse classes and got the same problem, the code was not able to connect to the given site. It failed stating the below</p> <blockquote> <p></p> </blockquote> <pre><code>05-10 00:37:53.191: WARN/System.err(294): java.net.UnknownHostException: feeds.feedburner.com 05-10 00:37:53.230: WARN/System.err(294): at java.net.InetAddress.lookupHostByName(InetAddress.java:513) 05-10 00:37:53.230: WARN/System.err(294): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:278) 05-10 00:37:53.230: WARN/System.err(294): at java.net.InetAddress.getAllByName(InetAddress.java:242) 05-10 00:37:53.250: WARN/System.err(294): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136) 05-10 00:37:53.250: WARN/System.err(294): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 05-10 00:37:53.250: WARN/System.err(294): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 05-10 00:37:53.271: WARN/System.err(294): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:348) 05-10 00:37:53.271: WARN/System.err(294): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 05-10 00:37:53.280: WARN/System.err(294): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 05-10 00:37:53.291: WARN/System.err(294): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 05-10 00:37:53.301: WARN/System.err(294): at com.example.hellowebview.HelloWebView.onCreate(HelloWebView.java:43) 05-10 00:37:53.301: WARN/System.err(294): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-10 00:37:53.309: WARN/System.err(294): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-10 00:37:53.322: WARN/System.err(294): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-10 00:37:53.330: WARN/System.err(294): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-10 00:37:53.340: WARN/System.err(294): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-10 00:37:53.350: WARN/System.err(294): at android.os.Handler.dispatchMessage(Handler.java:99) 05-10 00:37:53.350: WARN/System.err(294): at android.os.Looper.loop(Looper.java:123) 05-10 00:37:53.361: WARN/System.err(294): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-10 00:37:53.361: WARN/System.err(294): at java.lang.reflect.Method.invokeNative(Native Method) 05-10 00:37:53.372: WARN/System.err(294): at java.lang.reflect.Method.invoke(Method.java:521) 05-10 00:37:53.380: WARN/System.err(294): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-10 00:37:53.380: WARN/System.err(294): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-10 00:37:53.401: WARN/System.err(294): at dalvik.system.NativeStart.main(Native Method) 05-10 00:37:56.773: WARN/ActivityManager(58): Launch timeout has expired, giving up wake lock! 05-10 00:37:58.083: WARN/ActivityManager(58): Activity idle timeout for HistoryRecord{44fc9108 com.example.hellowebview/.HelloWebView} 05-10 00:38:06.300: DEBUG/KeyguardViewMediator(58): pokeWakelock(5000) 05-10 00:38:06.651: INFO/ARMAssembler(58): generated scanline__00000077:03545404_00000004_00000000 [ 47 ipp] (67 ins) at [0x3724c8:0x3725d4] in 7266287 ns 05-10 00:38:06.720: INFO/ARMAssembler(58): generated scanline__00000177:03515104_00001001_00000000 [ 91 ipp] (114 ins) at [0x371380:0x371548] in 1486222 ns 05-10 00:38:30.430: DEBUG/AndroidRuntime(294): Shutting down VM 05-10 00:38:30.430: WARN/dalvikvm(294): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): FATAL EXCEPTION: main 05-10 00:38:30.752: ERROR/AndroidRuntime(294): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hellowebview/com.example.hellowebview.HelloWebView}: java.lang.NullPointerException 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.os.Handler.dispatchMessage(Handler.java:99) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.os.Looper.loop(Looper.java:123) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at java.lang.reflect.Method.invokeNative(Native Method) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at java.lang.reflect.Method.invoke(Method.java:521) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at dalvik.system.NativeStart.main(Native Method) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): Caused by: java.lang.NullPointerException 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at com.example.hellowebview.HelloWebView.onCreate(HelloWebView.java:51) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 05-10 00:38:30.752: ERROR/AndroidRuntime(294): ... 11 more </code></pre> <p>Got it. For some reason the order in which the permission is set matters a lot. I changed the order of my permission setting in manifest file and it worked. Here's the modified manifest</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.hellowebview" android:versionCode="1" android:versionName="1.0"&gt; &lt;uses-sdk android:minSdkVersion="8" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;activity android:name=".HelloWebView" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>I am not sure what is the significance of this but would appreciate if anyone could elaborate.</p>
 

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