Discovery about Launcher on Android 4.x (Ice Cream Sandwich) Part1-2

Launcher 1-2

A upper-layer Framework of Launcher

DragIcon : Read a graph and Describe your scenario

Scroll Pages : Read a graph and Describe your scenario

How to exchange the default wallpaper?

..\frameworks\base\core\res\res\drawable-nodpi\default_wallpaper.jpg

WallpaperManager.java (frameworks\base\core\java\android\app)
      private Bitmap getDefaultWallpaperLocked(Context context) {
      try {
             InputStream is = context.getResources().openRawResource(
             com.android.internal.R.drawable.default_wallpaper);

              ...

The icon matrix of launcher

You can define these parameters to decide the size of matrix.

0,0	1,0	2,0	3,0
0,1	1,1	2,1	3,1
0,2	1,2	2,2	3,2
0,3	1,3	2,3	3,3

public Workspace(Context context, AttributeSet attrs, int defStyle) {

       super(context, attrs, defStyle);

       …

       // if the value is manually specified, use that instead

       cellCountX = a.getInt(R.styleable.Workspace_cellCountX, cellCountX);

       cellCountY = a.getInt(R.styleable.Workspace_cellCountY, cellCountY);

       mDefaultPage = a.getInt(R.styleable.Workspace_defaultScreen, 1);

       public CellLayout(Context context, AttributeSet attrs, int defStyle) {

       … 

       mOriginalCellWidth =

       mCellWidth = a.getDimensionPixelSize(R.styleable.CellLayout_cellWidth, 10);

       mOriginalCellHeight =

       mCellHeight = a.getDimensionPixelSize(R.styleable.CellLayout_cellHeight, 10);

Part 1 is over

Thank you for your patient reading