달콤 쌉싸래한 인생 » Android

CalledFromWrongThreadException

Kim Jong-seon — Thu, 03 Mar 2011 02:17:07 +0000

http://binsolb.tistory.com/entry/CalledFromWrongThreadException

dp와 sp

Kim Jong-seon — Wed, 02 Mar 2011 00:35:08 +0000

출처 – http://www.androidpub.com/29666

* dp : 160-dpi 화면에 상대적인 밀도 독립 필셀

화면의 물리적 밀도에 기반한 추상적인 단위로서 160-dpi 화면에 상대적이다.

(즉, 1dp 는 160-dpi 화면에서 픽셀 하나에 해당하는 값이다)

dp-to-pixel 비율은 화면 밀도에 따라 바뀌지만 정비례할 필요는 없다.

* sp : 크기 독립 픽셀

dp 단위와 비슷하지만 추가적으로 사용자가 선택한 글꼴 크기에 의해 크기가 조절된다.

이 단위는 글꼴 크기를 지정하는 데 사용되도록 권장되는데, 이렇게 하면 화면 밀도와사용자의

선택 모두를 감안해 조정될 것이다.

Gingerbread Source Code Download

Kim Jong-seon — Wed, 23 Feb 2011 12:36:18 +0000

Gingerbread Source code download

ubuntu 64비트 환경에서 작업

1. ubuntu 64bit

진저브레드 소스코드를 다운받아 컴파일 하려면 ubuntu 64비트에서만 작업가능

2. JDK 6

프로요 아래버전은 JDK 5 버전에 최적화

진저브레드 버전은 JDK 6 버전에 최적화

repository 추가 후 sun-java6-jdk 설치

sudo add-apt-repository “deb http://archive.canonical.com/ lucid partner”
sudo add-apt-repository “deb-src http://archive.canonical.com/ubuntu lucid partner”
sudo apt-get update
sudo apt-get install sun-java6-jdk
sudo update-java-alternatives -s java-6-sun

3. 개발환경 설정

아래 패키지 설치

$ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev ia32-libs x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev

추가로 Valgrind 설치 (메모리 leaks 검사)

apt-get install valgrind

4. repo 설치

홈디렉토리에서

$mkdir ~/bin

$PATH=~/bin:$PATH

$ curl http://android.git.kernel.org/repo > ~/bin/repo
$ chmod a+x ~/bin/repo

5. repo client 설치

$mkdir ~/bin/gingerbread

$cd ~/bin/gingerbread

$repo init -u git://android.git.kernel.org/platform/manifest.git -b gingerbread

6. source 파일 다운로드

$repo sync

7. 소스코드 빌드

$ export ANDROID_JAVA_HOME=$JAVA_HOME

$ cd ~/directory
$ source build/envsetup.sh
$ lunch
$ make

SimpleCursorAdapter 사용시 column ‘_id’ does not exist 에러가 뜨면?

Kim Jong-seon — Tue, 07 Sep 2010 14:51:31 +0000

SimpleCursorAdapter 사용시 column ‘_id’ does not exist 에러가 뜨면?

출처 – http://androidhuman.tistory.com

Log 남기기

Kim Jong-seon — Tue, 31 Aug 2010 12:04:04 +0000

android.util.Log 클래스에 메서드를 이용하면된다.

Log 클래스 안에 모든 메서드는 static 으로 선언되어 있기때문에 객체 생성 없이 그냥 불러 쓰면된다.

상황에 따라 debug, error, warning, information 등의 메서드를 사용하면 된다.

아래와 같이..

사용 방법은

클래스의 멤버 변수로

private static final String TAG = "[Debug Message] ";

“[Debug Message]” 라는 tag 를 지정해준 후

로그를 남기고자 하는 부분에

Log.d(TAG, "### onCreate() start!!");

와 같이 로그를 남기면 된다.

Logcat 에서 아래와 같이 확인할 수 있다.

안드로이드 앱 개발 페스티벌 개발자 컨퍼런스

Kim Jong-seon — Fri, 27 Aug 2010 12:06:12 +0000

출처 – http://twitonair.com/SKTstore

파일 관리

Kim Jong-seon — Wed, 25 Aug 2010 12:49:58 +0000

파일 경로는 /data/data/패키지명/files 디렉토리에 저장

Context 클래스

입출력 관련 메서드

파일 삭제 메서드

파일 저장 예

try {
   FileOutputStream fos = openFileOutput("test.txt", Context.MODE_WORLD_READABLE);
   String str = "Android File IO Test";
   fos.write(str.getBytes());
   fos.close();
   mEdit.setText("write success");
} catch (FileNotFoundException e) {
   System.out.println(e.getMessage());
} catch (IOException e) {
   System.out.println(e.getMessage());
}

openFileOutput() 메서드를 이용. String name : 파일명, int mode : 모드 선택

write() 메서드를 이용해서 파일 안에 데이터를 저장한다. 마지막엔 close()를 호출한다.

파일을 삭제할 때는 deleteFile(String name) 메서드를 호출하면 된다.

res 디렉토리에서 파일을 불러올 때는 위에 메서드들을 사용한다.


InputStream fres = getResources().openRawResource(R.raw.restext);

이런 형식으로

Error generating final archive: Debug certificate expired on

Kim Jong-seon — Fri, 06 Aug 2010 02:43:56 +0000

Error generating final archive: Debug certificate expired on 10. 8. 5 오전 4:03!

에러 발생 시에

아래 경로에서 debug.keystore 파일을 지워준다.

C:\Documents and Settings\\.Android\debug.keystore

그리고 Eclipse 메뉴 -> project -> clean 으로 refresh!

Android Version

Kim Jong-seon — Thu, 01 Jul 2010 05:28:12 +0000

from wikipedia

Android has seen a number of updates since its original release. These updates to the base operating system typically fix bugs and add new features.

1.1	Released 9 February 2009
1.5 (Cupcake) Based on Linux Kernel 2.6.27	On 30 April 2009, the official 1.5 (Cupcake) update for Android was released.^[35]^[36] There were several new features and UI updates included in the 1.5 update:^[37] Ability to record and watch videos through camcorder mode Uploading videos to YouTube and pictures to Picasa directly from the phone A new soft-keyboard with text-prediction Bluetooth A2DP and AVRCP support Ability to automatically connect to a Bluetooth headset within a certain distance New widgets and folders that can populate the Home screens Animated screen transitions
1.6 (Donut) Based on Linux Kernel 2.6.29^[38]	On 15 September 2009, the 1.6 (Donut) SDK was released.^[39]^[40] Included in the update were:^[38] An improved Android Market experience An integrated camera, camcorder, and gallery interface Gallery now enables users to select multiple photos for deletion Updated Voice Search, with faster response and deeper integration with native applications, including the ability to dial contacts Updated search experience to allow searching bookmarks, history, contacts, and the web from the home screen Updated technology support for CDMA/EVDO, 802.1x, VPNs, and a text-to-speech engine Support for WVGA screen resolutions Speed improvements in searching and camera applications Gesture framework and GestureBuilder development tool
2.0/2.1 (Eclair) Based on Linux Kernel 2.6.29^[41]	On 26 October 2009 the 2.0 (Eclair) SDK was released.^[42] Among the changes were:^[43] Optimized hardware speed Support for more screen sizes and resolutions Revamped UI New Browser UI and HTML5 support New contact lists Better white-black ratio for backgrounds Improved Google Maps 3.1.2 Microsoft Exchange support Built in flash support for Camera Digital Zoom MotionEvent class enhanced to track multi-touch events^[44] Improved virtual keyboard Bluetooth 2.1 Live Wallpapers The 2.0.1 SDK was released on 3 December 2009.^[45] The 2.1 SDK was released on 12 January 2010.^[46]
2.2 (Froyo)^[47] Based on Linux Kernel 2.6.32^[48]	On 20 May 2010 the 2.2 (Froyo) SDK was released.^[2] On 28 June 2010 an OTA (over the air) update to Android 2.2 build number FRF85B commenced to T-mobile customers with a Google Nexus One phone. Changes included:^[49] General Android OS speed, memory, and performance optimizations^[50] Additional application speed improvements courtesy of JIT implementation^[51] Integration of Chrome‘s V8 JavaScript engine into the Browser application Increased Microsoft Exchange support (security policies, auto-discovery, GAL look-up, calendar synchronization, remote wipe) Improved application launcher with shortcuts to Phone and Browser applications USB tethering and WiFi hotspot functionality Added an option to disable data access over mobile network Updated Market application with batch and automatic update features^[50] Quick switching between multiple keyboard languages and their dictionaries Voice dialing and contact sharing over Bluetooth Support for numeric and alphanumeric passwords Support for file upload fields in the Browser application^[52] Support for installing applications to the expandable memory^[53] Adobe Flash 10.1 support^[54]
3.0 (Gingerbread)^[55] Based on Linux Kernel 2.6.33 or 34^[48]	Tentatively scheduled for October 2010. Confirmed new features: Support for WebM video playback^[56] Improved copy–paste functionalities^[57] Unconfirmed new features: Free Lossless Audio Codec (FLAC) playback support^{[citation needed]} Android Market music store Media streaming from PC library Revamped UI^[58] Support for bigger screens with up to 1366×768 resolution ^[59]

The Froyo Code Drop

Kim Jong-seon — Mon, 28 Jun 2010 11:30:14 +0000

원문 – http://android-developers.blogspot.com/2010/06/froyo-code-drop.html

번역 – http://www.kandroid.org/board/board.php?board=kandori&command=body&no=51