title: Android Broadcast Receiver Error: Class not found exception
body: <p>I have a Broadcast receiver setup so that a pop-up message is displayed to the user after each upgrade of my app, or if this is the first time the package is installed. I tested this on my Droid running Android 2.2 both as a fresh install and after upgrading my app, as well in the Emulator running 1.5 and 1.6, and I see everything run fine.</p>
  
  <p>However, I received an error report from a user that lists the following exception:</p>
  
  <pre><code>java.lang.RuntimeException: Unable to instantiate receiver 
  com.name.pkg.FirstRunBroadcastReceiver: java.lang.ClassNotFoundException: com.name.pkg.app_name.FirstRunBroadcastReceiver in loader dalvik.system.PathClassLoader[/data/app/com.name.pkg.app_name.apk]
  at android.app.ActivityThread.handleReceiver(ActivityThread.java:2789)
  at android.app.ActivityThread.access$3200(ActivityThread.java:125)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:123)
  at android.app.ActivityThread.main(ActivityThread.java:4627)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:521)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  at dalvik.system.NativeStart.main(Native Method)
  Caused by: java.lang.ClassNotFoundException: com.name.pkg.app_name.FirstRunBroadcastReceiver in loader dalvik.system.PathClassLoader[/data/app/com.name.pkg.app_name.apk]
  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
  at android.app.ActivityThread.handleReceiver(ActivityThread.java:2780)
  ... 10 more
  </code></pre>
  
  <p>Can someone tell me why one of my users received this exception?</p>
  
  <p>In my Manifest file, I have things setup like this:</p>
  
  <pre><code>&lt;receiver android:name=".FirstRunBroadcastReceiver"&gt;
      &lt;intent-filter&gt;
          &lt;action android:name="android.intent.action.PACKAGE_REPLACE"/&gt;
          &lt;data android:scheme="package" android:path="com.name.pkg.app_name"&gt;
      &lt;/intent-filter&gt;
  &lt;/receiver&gt;
  </code></pre>
  
  <p>The class FirstRunBroadcastReceiver is setup like this:</p>
  
  <pre><code>package com.name.pkg.app_name;
  
  public class FirstRunBroadcastReceiver extends BroadcastReceiver
  {
      @Override
      public void onReceive(Contenxt context, Intent intent)
      {
          Uri uri = intent.getData();
          if( uri.toString().compareTo("package:com.name.pkg.app_name") == 0 )
          {
              //set shared prefs data to determine if start-up message should be shown
          }
      }
  }
  </code></pre>
  
  <p>Upon a first time install, the default value for the shared prefs is set so that the pop-up message will be displayed, but I wouldn't think that would have anything to do with this exception.</p>
  
  <p>I tested it again, and I don't receive an exception. Thanks for any help you can provide.</p>