Android Learning Notes: August 2010

Wednesday, August 18, 2010

How to do in resources ?

18 Aug 2010
Where to put our own resource files ?

/assets

How to define String array in Resource?


<string-array name="string_array_name">
<item>text_string</item>
</string-array>

Monday, August 16, 2010

How to do in Algorithms ?

16 Aug 2010
How to clac MD5 ?


MessageDigest digest = MessageDigest.getInstance("MD5");  
digest.update(s.getBytes());  
byte[] messageDigest = digest.digest();  
StringBuffer hexString = new StringBuffer();  
for(int i = 0 ; i < messageDigest.length ; i++)  
hexString.append(Integer.toHexString(0xFF & messageDigest[i]));  
return hexString.toString();

How to do in Web related components ?

16 Aug 2010
How to get the bookmarks ?


Cursor cursor = Browser.getAllBookmarks(getContentResolver());
cursor.moveToFirst();
do {
Log.d("Bookmark: ", cursor.getString(1));
} while (cursor.moveToNext());

How to load data in WebView ?


webview.loadData("<html></html>", "text/html", "utf-8");

How to do in XML reader and writer ?

16 Aug 2010
How to make DefaultHandler.startElement() running ?


factory.setNamespaceAware(false);
factory.setFeature("http://xml.org/sax/features/namespace-prefixes", true);

How to in Thread ?

16 Aug 2010
How to do a Thread ?


private Handler handler = new Handler() {
  public void handleMessage(Message msg) {
    super.handleMessage(msg);
  }
};

new Thread(new Runnable() {
  public void run() {
    while (true) {
      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
      }
      handler.sendEmptyMessage(0);
    }
  }
}).start();

Sunday, August 15, 2010

How to do in Text ?

16 Aug 2010
How to compare String and Editable ?


Editable.toString().equals(String)

How to configure View in XML ?

16 Aug 2010
How to set the EditView as Password Mask ?

android:password="true"

How to make TextView display center ?

android:gravity="center_vertical|center_horizontal"