Android Building Your First App Basics

I'm having a difficult time getting the results that should be displayed as described in the second step of the First App project on the android developer website: developer.androi

Solution 1:

It doesn't look like your emulator has started up yet. Wait for it to boot to the homescreen, and then your app should run.

Solution 2:

A couple of points:

1. It seems you aren't letting your app actually start. The first screen you posted is just the "boot" screen of your emulator
2. Have you tried switching to the debug perspective in Eclipse? At the bottom you'll see what Eclipse is actually doing. You have to switch to the console view and/or view the logcat to see a bit more detail, but that should actually help you in your efforts.
3. If you have trouble starting up your Emulator, you can test it by itself. You have (for instance) the option to select the second of the two Android icons that are in the upper bar in Eclipse. It should be the one that says "Android Virtual Device Manager". When you select it, it shows you your configured Emulators, though you can configure new ones as well. You can start one of those in advance and see how they work.

Solution 3:

It seems that you have not still executed your app (the emulator is still booting).

I'm quite new to both Java and Android (just a few weeks on it, following an online course) but I found the emulator really slow and I'd really advice you to plug in a real device and use it for running the app.

When connecting my Galaxy S2 to Linux and clicking RUN, Eclipse allows you to use it for execute the app. In the examples of the course I'm following, the apps starts in just a couple of seconds, while running them in the emulator is painful.

If you still need to use the emulator, you can speed it up by editing the properties of your virtual device in ADT and switching on the flag "[X] Use snapshot". By activating this flag, you won't "power off" and "power on" the "virtual device" each time: when you close it, its current state will be saved to disk as an snapshot and when you run it again, you won't need to wait for it to boot. The snapshot will be used and the virtual device will startup very fast.

Solution 4:

Got some similar problem with real device. After have been working well on helloworld, keep on displaying HelloWorld after some changes in the code(building the UI). That is the stack i've no idea to resolve...