Android experiences

Moved to Blogger

bradchow — Mon, 24 Jan 2011 02:34:02 +0000

This blog will not be updated and move to Blogger
Sorry for the inconvenience.

git

bradchow — Wed, 12 Jan 2011 11:45:40 +0000

git diff
find the different between local and server.

git diff .
find the different between . and server.

git reset –hard
all the changes are lost.

git reset –hard HEAD~2
reset to previous 2 commit

git reset –hard
reset to commit-id

git pull
sync code

git branch -f
change branch

git checkout
check out

count from file output

bradchow — Wed, 12 Jan 2011 11:39:16 +0000

cat file | cut -f 1 | awk ‘{tot=tot+$1} END {print tot}’

Check if SD card storage is available

bradchow — Mon, 09 Aug 2010 06:43:54 +0000

public static boolean hasStorage(boolean requireWriteAccess) { String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state)) { return true; } else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { return true; } return false; }

Reference:
Android: Check if SD card storage is available

check if any network connected

bradchow — Tue, 27 Jul 2010 11:07:18 +0000

private boolean checkIfNetworkConnected() {
　　boolean result = false;
　　ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
　　NetworkInfo info=connManager.getActiveNetworkInfo();
　　if (info == null || !info.isConnected()) {
　　　　result = false;
　　} else {
　　　　if (!info.isAvailable()) {
　　　　　　result =false;
　　　　} else {
　　　　　　result = true;
　　　　}
　　}

　　return result;
}

Reference:
Android 偵測網路是否連線

7z in Ubuntu

bradchow — Mon, 28 Jun 2010 02:42:25 +0000

sudo apt-get install p7zip-full

//x: Extract with full paths
7z x 7zfile

grep

bradchow — Mon, 26 Apr 2010 08:08:18 +0000

-i, –ignore-case
Ignore case distinctions in both the PATTERN and the input files. (-i is specified by POSIX.)

-R, -r, –recursive
Read all files under each directory, recursively; this is equivalent to the -d recurse option.

-v, –invert-match
Invert the sense of matching, to select non-matching lines. (-v is specified by POSIX.)

-w, –word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

make sdk fail about DroidDoc

bradchow — Wed, 30 Sep 2009 10:34:16 +0000

$ sudo apt-get install sun-java5-jdk $ cd /etc/alternatives $ sudo rm javadoc.1.gz $ sudo ln -s /usr/lib/jvm/java-1.5.0-sun/man/man1/javadoc.1.gz javadoc.1.gz $ sudo rm javadoc $ sudo ln -s /usr/lib/jvm/java-1.5.0-sun/bin/javadoc javadoc

Reference:
編譯Android cupcake SDK

how to remove ^M in vi

bradchow — Tue, 22 Sep 2009 01:24:25 +0000

:1,$s/^M//g

^M: Ctrl+V, and press Enter

Basic Concept of Android Application Components

bradchow — Tue, 07 Jul 2009 02:30:09 +0000

Activity
An application may or may not have a User Interface. If it has a user interface, it will have one or more Activity.

Service
If an application is to have a long life cycle it should be put into a Service. For example a background data synchronization utility running continuously should be implemented as a Service.

BroadcastReceiver
Like Services, BroadcastReceivers do not have a User Interface. Of even more importance, the code running in the onReceive method of a BroadcastReceiver should make no assumptions about persistence or long-running operations. If the BroadcastReceiver requires more than a trivial amount of code execution, it is recommended that the code initiate a request to a Service to complete the requested functionality.

Content Provider
If an application manages data and needs to expose that data to other applications running in the Android environment, a ContentProvider should be implemented.

Reference:
Unlocking Android – A Developer’s Guide