Setting 之dashboard 點擊跳轉流程

設置的主界面的可以通過修改xml中的dashboard_categaries.xml 文件實現，在DashboardSummary.java 文件中的rebuildUI（）方法中將xml對應的實體類轉換成對應的view，具體細節可以看設置源碼。

一，dashboard_categaries中定義節點的樣式：

 1  <!-- Wifi -->
 2         <dashboard-tile
 3             android:id="@+id/wifi_settings"
 4             android:fragment="com.android.settings.wifi.WifiSettings"
 5             android:icon="@drawable/sunmi_wifi"
 6             android:title="@string/wifi_settings_title" />
 7         <!-- 移動網路 -->
 8         <dashboard-tile
 9             android:id="@+id/mobile_net_settings"
10             android:icon="@drawable/sunmi_network"
11             android:title="@string/network_settings_title" >
12             <intent
13             android:action="android.intent.action.MAIN"
14             android:targetClass="com.android.phone.MobileNetworkSettings"
15             android:targetPackage="com.android.phone" />
16         </dashboard-tile>

這是設置中的wifi,和移動網路選項，一個是添加fragment ，另一個是添加intent

解析這個xml是在SettingActivity中的loadCategoriesFromResource(R.xml.dashboard_categories, categories);方法中，

二，DashboardSummary.java 文件中的rebuildUI（）方法

 1 private void rebuildUI(Context context) {
 2         if (!isAdded()) {
 3             return;
 4         }
 5         final Resources res = getResources();
 6         mDashboard.removeAllViews();
 7         List<DashboardCategory> categories = ((SettingsActivity) context).getDashboardCategories(true);
 8         final int count = categories.size();
 9         for (int n = 0; n < count; n++) {
10             DashboardCategory category = categories.get(n);
11             View categoryView = mLayoutInflater.inflate(R.layout.dashboard_category, mDashboard, false);
12             TextView categoryLabel = (TextView) categoryView.findViewById(R.id.category_title);
13             categoryLabel.setText(category.getTitle(res));
14 
15             ViewGroup categoryContent = (ViewGroup) categoryView.findViewById(R.id.category_content);
16 
17             final int tilesCount = category.getTilesCount();
18             for (int i = 0; i < tilesCount; i++) {
19                 DashboardTile tile = category.getTile(i);
20                 DashboardTileView tileView = new DashboardTileView(context);
21                 updateTileView(context, res, tile, tileView.getImageView(), tileView.getTitleTextView(),
22                         tileView.getStatusTextView());
23 
24                 tileView.setTile(tile);
25                 categoryContent.addView(tileView);
26             }
27 
28             // Add the category
29             mDashboard.addView(categoryView);
30         }
31     }

分析源碼可知rebuildui（）是將xml中解析的實體類，構建成對應的view(categoryView,DashboardTileView)在這並沒有看到添加點擊事件，所以猜測應該寫到DashboardTileView中了

三，DashboardTileView的點擊事件

1 public class DashboardTileView extends FrameLayout implements View.OnClickListener 

看到這裡就知道是在這裡實現點擊事件處理的

1  @Override
2     public void onClick(View v) {
3         if (mTile.fragment != null) {
4             Utils.startWithFragment(getContext(), mTile.fragment, mTile.fragmentArguments, null, 0,
5                     mTile.titleRes, mTile.getTitle(getResources()));
6         } else if (mTile.intent != null) {
7             getContext().startActivity(mTile.intent);
8         }
9     }

看到這裡一目瞭然啦，可以知道fragment 優先順序>intent 
再來看fragment的跳轉

四，fragment的跳轉細節

 1 public static void startWithFragment(Context context, String fragmentName, Bundle args,
 2             Fragment resultTo, int resultRequestCode, int titleResId,
 3             CharSequence title) {
 4         startWithFragment(context, fragmentName, args, resultTo, resultRequestCode,
 5                 null /* titleResPackageName */, titleResId, title, false /* not a shortcut */);
 6     }
 7 
 8 public static void startWithFragment(Context context, String fragmentName, Bundle args,
 9             Fragment resultTo, int resultRequestCode, String titleResPackageName, int titleResId,
10             CharSequence title, boolean isShortcut) {
11         Intent intent = onBuildStartFragmentIntent(context, fragmentName, args, titleResPackageName,
12                 titleResId, title, isShortcut);
13         if (resultTo == null) {
14             context.startActivity(intent);
15         } else {
16             resultTo.startActivityForResult(intent, resultRequestCode);
17         }
18     }
19 
20  public static Intent onBuildStartFragmentIntent(Context context, String fragmentName,
21             Bundle args, String titleResPackageName, int titleResId, CharSequence title,
22             boolean isShortcut) {
23         Intent intent = new Intent(Intent.ACTION_MAIN);
24         intent.setClass(context, SubSettings.class);
25         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT, fragmentName);
26         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS, args);
27         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RES_PACKAGE_NAME,
28                 titleResPackageName);
29         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RESID, titleResId);
30         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE, title);
31         intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_AS_SHORTCUT, isShortcut);
32         return intent;
33     }

可以知道是通過構建一個帶fragmentName參數的intent來啟動SubSettings.class 
而SubSettings.class中並沒有實現具體添加fragment，在父類SettingsActivity中oncrreate()中獲取具體參數，添加對應fragment

點擊Setting 之dashboard 點擊跳轉流程就是這樣啦

轉自：http://blog.csdn.net/kingyc123456789/article/details/53175624