how to make facebook api sample project

1. Download facebook android api.

2. Extract the downloaded file to a proper folder.

3. Make Android application project using facebook folder.

4. Import sample project Hackbook using existing projects into workspace. Do not use existing android code into workspace.

5. Add facebook library to project.

6. Fix project properties

how to deal char

1. get char code: cast (int) for char



char = 'ㅎ';
int charCode = (int) char;



2. compare two chars:



char char1='ㄹ';
char char2='ㅌ';

if(char == char2) //do something



3. 'ㅎ' is not same as ininial sound 'ㅎ' of '하나';

get initial sound of Korean String

private char getChosung(String s) {

// typo스트링의 글자수 만큼 list에 담아둡니다.
for (int i = 0; i < s.length(); i++) {
char comVal = (char) (s.charAt(i) - 0xAC00);

if (comVal >= 0 && comVal <= 11172) {
// 한글일경우

// 초성만 입력 했을 시엔 초성은 무시해서 List에 추가합니다.
char uniVal = (char) comVal;

// 유니코드 표에 맞추어 초성 중성 종성을 분리합니다..
char cho = (char) ((((uniVal - (uniVal % 28)) / 28) / 21) + 0x1100);

if (cho != 4519) {
return cho;
}

} else {
return 'ㄱ';
}
}
return 'ㄱ';
}

if animation and scrolllistener collide

add scrolllistener when animation is finished(onAnimationEnd method).

get city name without open api

private void getCityName(double mLat, double mLong) {


String result = null;
Geocoder mGeoCoder = new Geocoder(this, Locale.KOREA);

try {
List<Address> addrs = mGeoCoder.getFromLocation(mLat, mLong, 1);
Address address = addrs.get(0);
result = address.getLocality();
} catch (IOException e) {
}

Toast.makeText(this, result, Toast.LENGTH_LONG).show();

}

slide up animation when start activity

Intent intent = new Intent(this, LoginActivity.class);
ActivityOptions options = ActivityOptions.makeCustomAnimation(this,
R.animator.slide_up, R.animator.fade_in);
startActivity(intent, options.toBundle());





-------slide_up.xml-------------------


<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="@android:integer/config_longAnimTime"
    android:fromYDelta="100%"
    android:toYDelta="0%" />




---------fade_in.xml----------------------


<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <alpha android:fromAlpha="1.0"
      android:toAlpha="0.9"
      android:duration="@android:integer/config_mediumAnimTime" />
</set>




!! If put 0 in the place of "R.animator.fade_in" in ActivityOptions.makeCustomAnimation method, the background activity will turn black.

android how to resize layout when softkeyboard goes up

<activity
            android:name="com.example.keyboardviewtest2.MainActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Light.NoTitleBar"
            android:windowSoftInputMode="adjustResize"
             >

get shared preference from other app

App 1:




Context otherAppsContext = null;
try {
otherAppsContext = createPackageContext(
"com.example.sharedpreferencehosttest",
Context.CONTEXT_IGNORE_SECURITY);
} catch (NameNotFoundException e) {
}

SharedPreferences.Editor editor = otherAppsContext
.getSharedPreferences(
"PREFS_FILE",
Context.CONTEXT_IGNORE_SECURITY).edit();
editor.putString("sharedpreferencehosttest", "sogi");
editor.commit();



App 2:




Context otherAppsContext = null;
try {
otherAppsContext = createPackageContext(
"com.example.sharedpreferencehosttest",
Context.CONTEXT_IGNORE_SECURITY);
} catch (NameNotFoundException e) {
}

SharedPreferences sharedPreferences = otherAppsContext
.getSharedPreferences("PREFS_FILE", Context.CONTEXT_IGNORE_SECURITY);

Toast.makeText(
this,
sharedPreferences.getString("sharedpreferencehosttest",
"can not get value"), Toast.LENGTH_LONG).show();

android webview detect scroll

make custom webview class extending webview, and override onscrollchanged method.

webview loadurl open in a browser??

webView.setWebViewClient(new WebViewClient(){
   public boolean shouldOverrideUrlLoading(WebView view, String url) {
    return (false);
   }
});

ObjectAnimation ran just one time

animator.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            v.setRotationY(0);
        }
    });

listview adapter.remove unsupportedoperationexception

Check if you use string array, not arraylist. String array doesn't have remove() method, so when you try to use remove() method, it gives UnsupportedOperationException. So change string array to arraylist.

String[] array = {"a","b","c","d","e","f","g"}; 
ArrayList<String> lst = new ArrayList<String>();
lst.addAll(Arrays.asList(array));
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
android.R.layout.simple_list_item_1, lst); 

ERROR_NOT_MARKET_MANAGED

Wait for your app to show up on Google Play market after you published it. Once it appears on market, maybe after several hours, you will get "Licensed" response.

if downloading android full source keeps fails

use the following two command instead of "repo sync".

$ sudo sysctl -w net.ipv4.tcp_window_scaling=0

$ repo sync -j1

how to access external drive from terminal on Ubuntu

cd /media
dir
cd *name of external hdd here*

how to get app installed date

long installed = context.getPackageManager().getPackageInfo("package.name", 0).firstInstallTime;

listview layout_weight not working

Check if layout_width of ListView tag is not "wrap_content".






<ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

android math ceil

(int) Math.ceil(apps.size() / 2) <-- 0

(int) Math.ceil(apps.size() / 2.0) <-- 1

how to download android full source 4

I am downloading android full source now following the steps on the android website.

http://source.android.com/source/downloading.html


At first, it didn't work. So I moved to the root folder and refollowed the steps. And It W
ORKED!!!

how to download android full source 3 - jdk, curl, python, and git

To download android full source, four programs should be installed in advance: cUrl, Python, Git, Jdk. Python is already installed on Ubuntu 12.04 Lts. So I had to install  cUrl, Git, and Jdk. It is easy to install cUrl and Git. I just had to type "sudo apt-get install curl" and "sudo apt-get install git" on terminal prompt.

I installed Oracle Sun Java jdk, not openjdk. I heared that sun jdk is better than openjdk. I installed jdk referencing the following blog.


http://www.printandweb.ca/2012/04/manually-install-oracle-jdk-6-for.html

how to download android full source 2 - language input on Ubuntu

After installed Ubuntu, an error message about language, Korean, showed up. I installed necessary packages about it. But I couldn't  input Korean. I restarted Ubuntu and added Korean input on IBus setting. Then I could enter Korean.

I can change language input pressing Ctrl and Space together. 

how to download android full source 1 - ubuntu

Android full source can be downloaded on Mac os or Linux, not Window. I use Window 7 like many guys.So I installed Ubuntu 12.04 lts, the popular linux version using Wubi, Ubuntu window installer. I chose 12.04 lts version because it is stable.



Ubuntu download url: http://www.ubuntu.com/download