Android "single top" launch mode and onNewIntent method
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by Rich
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Published on 2009-11-10T22:45:16Z
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2010/05/24
2:40 UTC
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I read in the Android documentation that by setting my Activity's launchMode property to singleTop OR by adding the FLAG_ACTIVITY_SINGLE_TOP
flag to my Intent, that calling startActivity(intent)
would reuse a single Activity instance and give me the Intent in the onNewIntent
callback. I did both of these things, and onNewIntent
never fires and onCreate
fires every time. The docs also say that this.getIntent()
returns the intent that was first passed to the Activity when it was first created. In onCreate
I'm calling getIntent
and I'm getting a new one every time (I'm creating the intent object in another activity and adding an extra to it...this extra should be the same every time if it was returning me the same intent object). All this leads me to believe that my activity is not acting like a "single top", and I don't understand why.
To add some background in case I'm simply missing a required step, here's my Activity declaration in the manifest and the code I'm using to launch the activity. The Activity itself doesn't do anything worth mentioning in regards to this:
in AndroidManifest.xml:
<activity
android:name=".ArtistActivity"
android:label="Artist"
android:launchMode="singleTop">
</activity>
in my calling Activity:
Intent i = new Intent();
i.putExtra(EXTRA_KEY_ARTIST, id);
i.setClass(this, ArtistActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(i);
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