launcher 类分析

1.class LauncherSetting{//定义数据的类

static final class Favorites implements BaseColumns {//一般通过内部类来实现BaseColumns

- URI定义
  - static final Uri CONTENT_URI = Uri.parse("content://" + LauncherProvider.AUTHORITY + "/" + LauncherProvider.TABLE_FAVORITES + "?" + LauncherProvider.PARAMETER_NOTIFY + "=true");
- 数据库中item项的定义
  - static final String ID = "_id";//定义ID
  - static final String TITLE = "title";//定义title

}

2.public class LauncherProvider extends ContentProvider{//定义ContentProvider

private static class DatabaseHelper extends SQLiteOpenHelper {//内部定义DatabaseHelper

}

launcher -->CreateShortcut.java

function:

Displays the shortcut creation dialog and launches, if necessary, the

appropriate activity

通过一个AddAdpter加入到一个list中，创建menu中ADD的功能：

1.创建dialog

mAdapter = new AddAdapter(Launcher.this);

AlertDialog.Builder builder=new AlertDialog.Builder(this);

builder.setAdatper(mAddapter,this);

AlertDialog dialog = builder.create(); dialog.setOnCancelListener(this);

2.创建dialog的监听主要监听以下动作：

AddAdapter.ITEM_SHORTCUT

Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);//Pick an activity given an intent, returning the class selected

pickIntent.putExtra(Intent.EXTRA_INTENT, new Intent(Intent.ACTION_CREATE_SHORTCUT));//加入EXTRA_INTENT

AddAdapter.ITEM_APPWIDGET//打开所有widget的dialog

pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,appWidgetId);

Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);

ArrayList<AppWidgetProviderInfo> customInfo = new ArrayList<AppWidgetProviderInfo>();

pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo);

通过上面四步就可以得到相应的widget dilaog

AddAdapter.ITEM_LIVE_FOLDER//打开folder的dialog

Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);

pickIntent.putExtra(Intent.EXTRA_TITLE,getText(R.string.title_select_live_folder));

pickIntent.putExtra(Intent.EXTRA_INTENT, newIntent(LiveFolders.ACTION_CREATE_LIVE_FOLDER));

AddAdapter.ITEM_WALLPAPER//打开wallppaper的选择器diaog

final Intent pickWallpaper = new Intent(Intent.ACTION_SET_WALLPAPER);//Action 为SET_wallpaper

startActivity(Intent.createChooser(pickWallpaper,getString(R.string.chooser_wallpaper)))选择器

launcher -->menu 的设计以及相应的事件监听1.menu 的添加

menu.add(MENU_GROUP_ADD, MENU_ADD, 0, R.string.menu_add).setIcon(

   android.R.drawable.ic_menu_add).setAlphabeticShortcut('A');//Add item

menu.add(0, MENU_WALLPAPER_SETTINGS, 0, R.string.menu_wallpaper)

.setIcon(android.R.drawable.ic_menu_gallery)

.setAlphabeticShortcut('W');//wallpaper item add

menu.add(0, MENU_SEARCH, 0, R.string.menu_search).setIcon(

android.R.drawable.ic_search_category_default)

.setAlphabeticShortcut(SearchManager.MENU_KEY);//search item add

menu.add(0, MENU_NOTIFICATIONS, 0, R.string.menu_notifications)

.setIcon(com.android.internal.R.drawable.ic_menu_notifications)

.setAlphabeticShortcut('N');//notification item add

final Intent settings = new Intent(android.provider.Settings.ACTION_SETTINGS);

settings.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

menu.add(0, MENU_SETTINGS, 0,R.string.menu_settings).setIcon(android.R.drawable.ic_menu_preferences).setAlphabeticShortcut(

'P').setIntent(settings);//setting item add

search分析

启动Broswer去search你的内容可用以下代码：

Intent intent = new Intent(Intent.ACTION_SEARCH);// action search

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.putExtra(SearchManager.QUERY, query);//query 为你要查询的东西

startActivity(Intent);

  2.Launcher的search中用SimpleCursorAdapter来实现AutoCompleteTextView的自动匹配动作。
  3.SimpleCursorAdapter是通过searchInfo来操作SearchRecentSuggestionsProvider的数据库，通过查询出来的curosr然后改变原来的cursor来布局到AutoCompleteTextView中去