Quickly search, find and launch apps, contacts, bookmarks, artists, albums and songs on your Android phone. Quickdroid is just like Quicksilver for Mac OS X, Launchy for Microsoft Windows or GNOME Do for Linux. It also includes a launcher for the most recently used search results.
Quickdroid has a plugin interface which enables you to easily extend it by other search categories.
Quickdroid does not run all the time. It only runs when you use it and also for a few seconds after un-/installing apps to sync the app index. For all other search categories Quickdroid uses the Content Providers that are already available on your phone. That saves a lot of battery power ;-). The quick launch symbol is only a PendingIntent (http://developer.android.com/reference/android/app/PendingIntent.html). So this optional feature does not keep Quickdroid around all the time. However, Android tries to always keep around some of your most recently used apps (and their respective Linux processes) to speed up the startup times of these apps. This apps are just sitting in the background until they are restarted, garbage collected or replaced by other most recently used apps. Such apps do not run all the time nor do they actively consume CPU time or battery power. Of course some task managers and the Linux ps command still show up this apps. But this behaviour is an Android feature, not a bug. The lifecycles of the activities and services that make up some Android app are completely decoupled from the lifecycle of the Linux process that hosts the app.
Here are some screenshots...
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