Run the command line to start the simulator and install and run launcher as a system-level program.

Only by installing and running launcher in the way of system and program can the default appwidget program be displayed when launcher is started. Otherwise

Java. Lang. securityexception: bindgagetid appwidgetid = 843 provider = componentinfo {com. Android. quicksearchbox/COM. Android. quicksearchbox. searchwidgetprovider }:
User 10047 does not have Android. Permission. bind_appwidget

This error occurs.

 

 

Emulator-AVD 1024_600_api8-partition-size 128
-- Here-partition-size 128 indicates that the system partition is expanded to 128 MB. If necessary, you can set it to a larger system partition.

ADB remount
-- Make the/system partition writable. Otherwise, the following push command will appear, as shown in "failed to copy 'launcher2_custom.apk 'to system/APP/launcher2_meiling.apk ': read-Only file system error prompt

ADB push launcher2_custom.apk/system/APP

When you no longer need this custom launcher APK, you can directly Delete the corresponding APK file in/system/APP in ADB shell mode.

With the same principle, an appwidget (such as the real-time temperature control center of ML) is automatically displayed on the desktop at startup. The annotations and steps are as follows:

1. launcher2 source codeRes/XML/default_workspace.xmlDefines the layout of each sub-desktop in the launcher. Each sub-desktop corresponds to a celllayout (viewgroup subclass), and each celllayout contains multiple cells, each component on the desktop occupies an integer cell in the x/y direction.

 

2. In launcher. Java of launcher2 source code, the definition is as follows:
Static final int screen_count = 4; -- launcher contains several screens
Static final int default_screen = 0; -- Which screen is displayed by default after launcher is started
Static final int number_cells_x = 9; -- the number of cells horizontally included in the celllayout corresponding to each screen
Static final int number_cells_y = 5; -- how many cells are contained vertically in the celllayout corresponding to each screen?

 

3. The example of appwidget added in default_workspace.xml is as follows:

<Appwidget
Launcher: packagename = "com. ml. Apps"
Launcher: classname = "com. ml. Apps. timetemperinforeceiver"
Launcher: screen = "0" -- in which screen the widget is displayed
Launcher: x = "0" -- the initial cell-X of this appwidget in screen
Launcher: Y = "0" -- the initial cell-y of this appwidget in screen
Launcher: Spanx = "9" -- cell span-X of this appwidget in screen
Launcher: spany = "5" -- cell span of this appwidget in screen-y
/>

 

4. The layout of the appwidget added in default_workspace.xml must adapt to the appwidget settings in the corresponding application; otherwise, the layout cannot be correctly displayed. The res/XML/APP corresponding to the appwidget contains a widget layout description file, for example, home_widget_provider.xml. The corresponding content is as follows:

<? XML version = "1.0" encoding = "UTF-8"?>
<Appwidget-provider xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: minheight = "368dp" Android: minwidth = "664dp"
Android: initiallayout = "@ layout/cell_main" Android: updateperiodmillis = "0">

</Appwidget-provider>

 

Note:When setting Android: minheight and Android: minwidth, the actual number of cells occupied by widgets is set. According to the practice, it seems that no matter in dimens. the actual values of workspace_cell_width and workspace_cell_height defined in the XML file are as follows: Android: minheight and Android: minwidth are set in the X and Y directions according to each cell 74dp., That is, 74 × cell _ Numbers-2. For example, the Launcher: Spanx = "9", Launcher: spany = "5" defined in (3) above, where
Android: minheight = "0000dp" (5 × 74-2), Android: minwidth = "664dp" (9*74-2)

5. After the above four steps, the basic work is completed, and then the application and launcher program corresponding to the appwidget are pushed to the/system partition, namely:
ADB push timertemperinfo.apk/system/APP
ADB push launcher2_meiling.apk/system/APP

You can. Practice shows that the push sequence of these two APK programs does not seem to have any impact.