Setting 之dashboard 点击跳转流程

设置的主界面的可以通过修改xml中的dashboard_categaries.xml 文件实现，在DashboardSummary.java 文件中的rebuildUI（）方法中将xml对应的实体类转换成对应的view，具体细节可以看设置源码。

一，dashboard_categaries中定义节点的样式：

        <!-- Wifi -->
        <dashboard-tile
            android:id="@+id/wifi_settings"
            android:fragment="com.android.settings.wifi.WifiSettings"
            android:icon="@drawable/sunmi_wifi"
            android:title="@string/wifi_settings_title" />
        <!-- 移动网络 -->
        <dashboard-tile
            android:id="@+id/mobile_net_settings"
            android:icon="@drawable/sunmi_network"
            android:title="@string/network_settings_title" >
            <intent
            android:action="android.intent.action.MAIN"
            android:targetClass="com.android.phone.MobileNetworkSettings"
            android:targetPackage="com.android.phone" />
        </dashboard-tile>

这是设置中的wifi,和移动网络选项，一个是添加fragment ，另一个是添加intent

解析这个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

private void rebuildUI(Context context) {
        if (!isAdded()) {
            return;
        }
        final Resources res = getResources();
        mDashboard.removeAllViews();
        List<DashboardCategory> categories = ((SettingsActivity) context).getDashboardCategories(true);
        final int count = categories.size();
        for (int n = 0; n < count; n++) {
            DashboardCategory category = categories.get(n);
            View categoryView = mLayoutInflater.inflate(R.layout.dashboard_category, mDashboard, false);
            TextView categoryLabel = (TextView) categoryView.findViewById(R.id.category_title);
            categoryLabel.setText(category.getTitle(res));

            ViewGroup categoryContent = (ViewGroup) categoryView.findViewById(R.id.category_content);

            final int tilesCount = category.getTilesCount();
            for (int i = 0; i < tilesCount; i++) {
                DashboardTile tile = category.getTile(i);
                DashboardTileView tileView = new DashboardTileView(context);
                updateTileView(context, res, tile, tileView.getImageView(), tileView.getTitleTextView(),
                        tileView.getStatusTextView());

                tileView.setTile(tile);
                categoryContent.addView(tileView);
            }

            // Add the category
            mDashboard.addView(categoryView);
        }
    }

分析源码可知rebuildui（）是将xml中解析的实体类，构建成对应的view(categoryView,DashboardTileView)在这并没有看到添加点击事件，所以猜测应该写到DashboardTileView中了

三，DashboardTileView的点击事件

public class DashboardTileView extends FrameLayout implements View.OnClickListener 

看到这里就知道是在这里实现点击事件处理的

 @Override
    public void onClick(View v) {
        if (mTile.fragment != null) {
            Utils.startWithFragment(getContext(), mTile.fragment, mTile.fragmentArguments, null, 0,
                    mTile.titleRes, mTile.getTitle(getResources()));
        } else if (mTile.intent != null) {
            getContext().startActivity(mTile.intent);
        }
    }

看到这里一目了然啦，可以知道fragment 优先级>intent
再来看fragment的跳转

四，fragment的跳转细节

 public static void startWithFragment(Context context, String fragmentName, Bundle args,
            Fragment resultTo, int resultRequestCode, int titleResId,
            CharSequence title) {
        startWithFragment(context, fragmentName, args, resultTo, resultRequestCode,
                null /* titleResPackageName */, titleResId, title, false /* not a shortcut */);
    }

public static void startWithFragment(Context context, String fragmentName, Bundle args,
            Fragment resultTo, int resultRequestCode, String titleResPackageName, int titleResId,
            CharSequence title, boolean isShortcut) {
        Intent intent = onBuildStartFragmentIntent(context, fragmentName, args, titleResPackageName,
                titleResId, title, isShortcut);
        if (resultTo == null) {
            context.startActivity(intent);
        } else {
            resultTo.startActivityForResult(intent, resultRequestCode);
        }
    }

 public static Intent onBuildStartFragmentIntent(Context context, String fragmentName,
            Bundle args, String titleResPackageName, int titleResId, CharSequence title,
            boolean isShortcut) {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.setClass(context, SubSettings.class);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT, fragmentName);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS, args);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RES_PACKAGE_NAME,
                titleResPackageName);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RESID, titleResId);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE, title);
        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_AS_SHORTCUT, isShortcut);
        return intent;
    }

可以知道是通过构建一个带fragmentName参数的intent来启动SubSettings.class
而SubSettings.class中并没有实现具体添加fragment，在父类SettingsActivity中oncrreate()中获取具体参数，添加对应fragment

点击Setting 之dashboard 点击跳转流程就是这样啦