Android-Hello World_问答_开发者_运维开发者技术经验分享

I'm currently learning how to create android applications so I started with the basic "Hello World" tutorial over at the Android Developers home page. The code is quite simple but when I run it(I'm using Eclipse and a AVD v2.2), it only shows "Android." It does not go to the Home Screen. I updated everything and I still get the same problem. Is there something I did not or

New errors:

[2010-09-29 09:35:04 - DeviceMonitor]Sending jdwp tracking request failed!

[2010-09-29 09:41:50 - HelloAndroid] Performing com.example.helloandroid.HelloAndroid activity launch
[2010-09-29 10:16:23 - HelloAndroid] Uploading HelloAndroid.apk onto device 'emulator-5554'
[2010-09-29 10:16:28 - HelloAndroid] Installing HelloAndroid.apk...
[2010-09-29 10:20:27 - HelloAndroid] Failed to install HelloAndroid.apk on device 'emulator-5554!
[2010-09-29 10:20:27 - HelloAndroid] (null)
[2010-09-2开发者_开发技巧9 10:20:29 - HelloAndroid] Launch canceled!

I assume you are using the emulator. You have to be patient; it takes a very long time to start up (several minutes.) You can start the emulator manually by going to the Window menu in Eclipse, selecting "the Android SDK and ADB manager," clicking on the emulator you created and then clicking on the Start button. Wait until you see the home screen. If necessary, unlock it by clicking and dragging the mouse down over the screen until it's unlocked.

If you have access to a physical phone and USB cable, you will have a much better (faster) experience overall.

Good luck!

I had the same problem and was bugged by it for two days. but this is what worked for me. one you get this error. try running your project (APP) again. it did the trick for me.

I had done everything. digged the web, installed and re-installed everything 4-5 times including the JDK as well. m not sure if it will help in the long run, but it seems to have worked for me.

As for me, I had the same problem and it helped to increase SD volume and max VM app heap size. (Android SDK and AVD manager - Virtual device - Edit) What is interesting, the back change of SD and heap to the previous values is OK, too. That means, that any change of emulator parameters and its rebuilding is enough. (Simple restart won't help)

Definitely, it is cheaper, than total reinstalling. :-)

unlock the screen from the emulator. That did the trick for me.

go to the run configurations and select target tab. under this tab you can see your targets. then select automatically radio button and select a check box of AVD. then try to run, most probably your issue will be solved.

I had the same problem and this is how I resolved.

if you run

adb devices

I had nothing on the list. So did.

adb kill-server

and

adb start-server

Now if you run the emulator again, the Activity oncreate event will hook properly. Not sure if this is intended but on the first run on the emulator does not work. And someone confirm on this? Thanks.

I had the same problem I was running Android 3.1 Java 1.6 on Eclipse. Just rerun the build process and it kicks in the second time.

I also encountered error when followed instructions, so i ran "adb logcat" which showed that it is not able to find the class.

In the instructions(tutorial) - : It has been said that (during create new project or class)application name set to Hello World and activity name became HelloWorldActivity.

So if you maintain both CreateActivity name and application name both same, then it might work.

I have increased the AVD RAM size to 1024 and VM application to 36 0r 48 or 24.

If anyone getting following error,

[2010-09-29 09:35:04 - DeviceMonitor]Sending jdwp tracking request failed!

[2010-09-29 09:41:50 - HelloAndroid] Performing com.example.helloandroid.HelloAndroid activity launch [2010-09-29 10:16:23 - HelloAndroid] Uploading HelloAndroid.apk onto device 'emulator-5554' [2010-09-29 10:16:28 - HelloAndroid] Installing HelloAndroid.apk... [2010-09-29 10:20:27 - HelloAndroid] Failed to install HelloAndroid.apk on device 'emulator-5554! [2010-09-29 10:20:27 - HelloAndroid] (null) [2010-09-29 10:20:29 - HelloAndroid] Launch canceled!

Simply restart your application. Wait for some time.Bcaz it take some time. when you will get screen with "Data-time-charging-lock", click on lock .There will be some animation.Again click on same lock. AND Your Are DONE.You will get output..........

this kept happening to me ... how i solved it was to use " adb install " in a command prompt ...search for adb.exe if its not in your path. Make sure the emulator is running by going to run configuration and hitting run. This starts the emulator without installing your apk file. After the emulator starts up run the command prompt stuff listed above.

I restarted my virtual device with the option Wipe User Data checked and then reran my app. That finally worked for me.

Note that in response to the other comments, I also tried the following: