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POStarting an Android Activity from a background Service
 

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    <p>I have a requirement to start an activity when the screen is idle after a certain time. I have established the best way is to create a custom broadcastReceiver which looks for the Intent.SCREEN_OFF intent and override it.</p> <p>Inside this custom broadcastReceiver, I'm starting the Activity. It works the first time the screen goes off, but it doesn't work again until the app is uninstalled and reinstalled.</p> <p>I'm getting the following error:</p> <blockquote> <p>android.content.ActivityNotFoundException: Unable to find explicit activity class {<em>/</em>}; have you declared this activity in your AndroidManifest.xml?</p> </blockquote> <p>To answer this rather obvious question, yes. I have.</p> <pre><code>&lt;activity android:name="gold.KioskPlayer" android:configChanges="orientation|keyboardHidden" android:enabled="true" android:launchMode="singleInstance" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.HOME" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; </code></pre> <p>It works from another Activity fine. Furthermore, if the Manifest was wrong, then it wouldn't work full stop.</p> <p>As Todd has suggested, "The error makes it sound like it somehow loses track of what Activity is supposed to be called." How is this possible? Is it a bug?</p> <p>So, here's the broadcastReceiver code:</p> <pre><code>BroadcastReceiver screenoff = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d("ScreenSaver", "ScreenSaver1 - ScreenOff"); //Log.d("Power Lock Pressed", "Power Button Off Pressed:" + intent.getAction()); if(!setup.screensaverShown || !setup.canSleep) { releaseWakeLock(); try { setup.wl = setup.pm.newWakeLock( PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "ScreenSaver"); setup.wl.acquire(); Thread.sleep(100); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } try{ KioskPlayer.setup.screensaver=true; Log.d("ScreenSaver", "ScreenSaver1 starting..."); Intent i = new Intent(getBaseContext(), KioskPlayer.class); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); getApplication().startActivity(i); }catch(Exception e) { Log.d("ScreenSaver", "ScreenSaver1 " + e.toString()); } try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }; BroadcastReceiver screenon = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if(setup.canSleep) { setup.canSleep=false; } } }; public void releaseWakeLock(){ try { if ( setup.wl != null &amp;&amp; setup.wl.isHeld() ) { setup.wl.release(); setup.wl = null; } }catch(Exception e){} } </code></pre> <p>I can call the Activity from another Activity fine. I can even call it from this Service fine, but once and once only before it gets that error.</p> <p>Help will be greatly appreciated!</p>
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    1. COAnd you are sure that you declared the Activity in your Manifest.xml?
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    2. COExceedingly. I'm calling the Activity from another Activity which works fine. It also works fine the first time the screen goes off. After that, it just gives the error.
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    3. COThe error makes it sound like it somehow loses track of what Activity is supposed to be called. Even though I don't doubt that you declared it in your manifest, maybe there'd be some value in posting that, too, just in case it's some related error.
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      1. USTodd Sjolander
 

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