Android launcher development icon background and default configuration, androidlauncher

Android launcher development icon background and default configuration, androidlauncher
1: Then I checked the desktop icon loading process myself:
When the desktop is loaded for the first time, an xml configuration file is read by default to complete the configuration. The configuration file is in the Launcher directory,
Path: \ Launcher \ res \ xml \ default_workspace.xml. This XML file is just upgraded, Launcher
The configuration file that will be read when a display is performed. Default_workspace. You can configure APP shortcuts, widgets, and Search bar in xml.




The method for parsing the default_workspace.xml file in launcher is the loadFavorites method in LauncherProvider. java.
LauncherProvider. java contains the loadFavorites () method:
Private int loadFavorites (SQLiteDatabase db, int workspaceResourceId ){
Intent intent = new Intent (Intent. ACTION_MAIN, null );
Intent. addCategory (Intent. CATEGORY_LAUNCHER );
ContentValues values = new ContentValues ();


If (LOGD) Log. v (TAG, String. format ("Loading favorites from resid = 0x % 08x", workspaceResourceId ));


PackageManager packageManager = mContext. getPackageManager ();
Int I = 0;
Try {
XmlResourceParser parser = mContext. getResources (). getXml (workspaceResourceId );
AttributeSet attrs = Xml. asAttributeSet (parser );
BeginDocument (parser, TAG_FAVORITES );


Final int depth = parser. getDepth ();


Final HashMap <Long, ItemInfo [] []> occupied = new HashMap <Long, ItemInfo [] []> ();
LauncherModel model = LauncherAppState. getInstance (). getModel ();
.
.
.
.


Return I;
}


It is actually a process of XML analysis and database writing. LauncherProvider. java is the data source of the entire Launcher,
Knowing how these icons are loaded is good for modifying the background size and columns on the screen.










2: add the Default background to the Launcher icon. It is a small part of theme functions and an indispensable part. Below are some logic and code I have compiled today. The obtaining and processing of Launcher icons is in the Utilities. java class,
We can find the Bitmap createIconBitmap (Drawable icon, Context context) method. This method returns the application icon.
Static Bitmap createIconBitmap (Bitmap icon, Context context ){
Int textureWidth = sIconTextureWidth;
Int textureHeight = sIconTextureHeight;
Int sourceWidth = icon. getWidth ();
Int sourceHeight = icon. getHeight ();
If (sourceWidth> textureWidth & sourceHeight> textureHeight ){
// Icon is bigger than it shoshould be; clip it (solves the GB-> ICS migration case)
Return Bitmap. createBitmap (icon,
(SourceWidth-textureWidth)/2,
(SourceHeight-textureHeight)/2,
TextureWidth, textureHeight );
} Else if (sourceWidth = textureWidth & sourceHeight = textureHeight ){
// Icon is the right size, no need to change it
Return icon;
} Else {
// Icon is too small, render to a larger bitmap
Final Resources resources = context. getResources ();
Return createIconBitmap (new BitmapDrawable (resources, icon), context );
}
}
You can modify the background of the icon here.
If (tru {
Bitmap backBitmap = BitmapFactory. decodeResource (context. getResources (),
R. drawable. apical_icon_bg );
Int backWidth = backBitmap. getWidth ();
Int backHeight = backBitmap. getHeight ();
If (backWidth! = SIconWidth | backHeight! = SIconHeight)
{
Matrix matrix = new Matrix ();
Matrix. postScale (float) sIconWidth/backWidth, (float) sIconHeight/backHeight );
Canvas. drawBitmap (Bitmap. createBitmap (backBitmap, 0, 0, backWidth, backHeight, matrix, true ),
. 0f, 0.0f, null );
} Else
{
Canvas. drawBitmap (backBitmap, 0.0f, 0.0f, null );
}
}


Directly specify an image as the icon background R. drawable. apical_icon_bg;













How to change the default icon for android Development

First, drag the icon image you want to change to the drawable-XX folder in your resource file, and then open AndroidManifest. in the xml configuration list file, find the android: icon = "@ drawable/ic_launcher" in the application tag. Here, ic_launcher refers to the name of the image you want,
For example, if you find an aa.jpg image under drawable-xx, you can reference android: icon = "@ drawable/aa" in the configuration file. Here, you can modify the application icon.

Android developer: Change the android icon ic_launcher to a custom

You don't want to change the android: icon every time.
Res/drawable in the Resource