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POHow to debug a NullPointerException in an Android app?
 

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  1. POHow to debug a NullPointerException in an Android app?
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    <p>I have a very simple app which isn't starting correctly. The app should load a splashscreen, and then the main app. For some reason it's now not working -</p> <p>Logcat:</p> <pre><code> 02-08 13:30:41.846: E/AndroidRuntime(275): Uncaught handler: thread main exiting due to uncaught exception 02-08 13:30:41.865: E/AndroidRuntime(275): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.KES.GApps/com.KES.GApps.Splashscreen}: java.lang.NullPointerException 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.os.Handler.dispatchMessage(Handler.java:99) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.os.Looper.loop(Looper.java:123) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread.main(ActivityThread.java:4363) 02-08 13:30:41.865: E/AndroidRuntime(275): at java.lang.reflect.Method.invokeNative(Native Method) 02-08 13:30:41.865: E/AndroidRuntime(275): at java.lang.reflect.Method.invoke(Method.java:521) 02-08 13:30:41.865: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 02-08 13:30:41.865: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 02-08 13:30:41.865: E/AndroidRuntime(275): at dalvik.system.NativeStart.main(Native Method) 02-08 13:30:41.865: E/AndroidRuntime(275): Caused by: java.lang.NullPointerException 02-08 13:30:41.865: E/AndroidRuntime(275): at android.view.ViewGroup.addViewInner(ViewGroup.java:1860) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.view.ViewGroup.addView(ViewGroup.java:1756) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.view.ViewGroup.addView(ViewGroup.java:1736) 02-08 13:30:41.865: E/AndroidRuntime(275): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:217) 02-08 13:30:41.865: E/AndroidRuntime(275): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.Activity.setContentView(Activity.java:1633) 02-08 13:30:41.865: E/AndroidRuntime(275): at com.KES.GApps.Splashscreen.onCreate(Splashscreen.java:13) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 02-08 13:30:41.865: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 02-08 13:30:41.865: E/AndroidRuntime(275): ... 11 more 02-08 13:30:41.884: I/dalvikvm(275): threadid=7: reacting to signal 3 02-08 13:30:41.884: E/dalvikvm(275): Unable to open stack trace file '/data/anr/traces.txt': Permission denied </code></pre> <p>xml for the splashscreen (welcome.xml):</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/img1" android:orientation="vertical" &gt; &lt;ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="200dp" android:layout_gravity="fill_horizontal" android:contentDescription="@string/crestinfo" android:src="@drawable/logov2" /&gt; &lt;TextView android:id="@+id/welcomescreen" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="right" android:text="@string/welcomescreen" android:textAppearance="?android:attr/textAppearanceLarge" android:textColor="#ffffff" android:textStyle="bold" android:padding="5dp" android:textSize="15pt" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>java:</p> <pre><code>package com.KES.GApps; import android.app.Activity; import android.content.Intent; import android.os.Bundle; public class Splashscreen extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.welcome); Thread splashThread = new Thread() { @Override public void run() { try { int waited = 0; while (waited &lt; 2000) { sleep(100); waited += 100; } } catch (InterruptedException e) { // do nothing } finally { finish(); Intent i = new Intent(); i.setClassName("com.KES.GApps", "com.KES.GApps.KingEdwardVIISchoolActivity"); startActivity(i); } } }; splashThread.start(); } } </code></pre> <p>Manifest file:</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.KES.GApps" android:versionCode="6" android:versionName="1.5" &gt; &lt;uses-sdk android:minSdkVersion="7" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;application android:name="KingEdwardVIISchool" android:debuggable="true" android:icon="@drawable/icon" android:label="@string/app_name" android:launchMode="standard" &gt; &lt;activity android:name="KingEdwardVIISchoolActivity" android:configChanges="orientation|keyboardHidden" android:label="@string/app_name" android:screenOrientation="portrait" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name="Splashscreen" android:configChanges="orientation|keyboardHidden" android:label="@string/app_name" android:screenOrientation="portrait" &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>
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    1. CODid you have a welcome.xml file in your res/layout directory? Has the R.java autogeneration succeed?
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    2. COIf welcome.xml was missing it wouldn't compile. My guess is that it has something to do with `startActivity(i);`
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    3. COThe first thing I suggest is cleaning the project. According to the error, it's crashing at `setContentView` which suggests to me that it can't find the layout. In Eclipse, select Project->Clean then rebuild it if you don't have it set to rebuild automatically.
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