RK：主屏幕

Platform: RK3288
OS: Android 7.1
Kernel: 4.4.143

Android7.0 DirectBoot阻塞开机分析 宇落无痕 https://blog.csdn.net/fu_kevin0606/article/details/65437594

一.需求: 仿Android5.1 Settings.apk 上的 设置 主屏幕
问题点:a.动态显示 一级设置列表 主屏幕
           b.二级设置列表 home 属性的list

二.Android 7.1 Setttings home识别个数异常
2.1.home属性的apk 有两个 Settings.apk Launcher.apk

    private int getHomeActivitiesCount() {
        final ArrayList<ResolveInfo> homeApps = new ArrayList<ResolveInfo>();
        getPackageManager().getHomeActivities(homeApps);
        return homeApps.size();
    }	

2.2.launcher启动流程增加了settings--->FallbackHome--->launcher

在启动Launcher之前会先启动一个FallbackHome，之后才会启动Launcher，而FallbackHome属于Settings中的一个透明的activity，
Settings的android:directBootAware=true，并且FallbackHome在category中配置了Home属性，而Launcher的
android:directBootAware=false，所以只有FallbackHome可以在direct boot模式下启动

补:Direct Boot模式下app是无法运行的要运行的话需要在AndroidManinfest.xml中设置 android:directBootAware="true"

        <!-- Triggered when user-selected home app isn't encryption aware -->
        <activity android:name=".system.FallbackHome"
                  android:excludeFromRecents="true"
                  android:theme="@style/FallbackHome">
            <intent-filter android:priority="-1000">
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.HOME" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

其中包括home属性，这样影响后续识别home属性的应用，这里介绍一个过滤的办法:

 https://www.cnblogs.com/crushgirl/p/13437967.html

android:excludeFromRecents="true"	

在 Android 系统中，如果我们不想某个 Activity 出现在 “Recent screens” 中，可以设置这条属性:

2.3.packagesappsSettingssrccomandroidsettingsHomeSettings.java

    private void buildHomeActivitiesList() {
        ArrayList<ResolveInfo> homeActivities = new ArrayList<ResolveInfo>();
        ComponentName currentDefaultHome  = mPm.getHomeActivities(homeActivities);

        Context context = getPrefContext();
        mCurrentHome = null;
        mPrefGroup.removeAll();
        mPrefs = new ArrayList<HomeAppPreference>();
        mHomeComponentSet = new ComponentName[homeActivities.size()];
        int prefIndex = 0;
        boolean supportManagedProfilesExtra =
                getActivity().getIntent().getBooleanExtra(EXTRA_SUPPORT_MANAGED_PROFILES, false);
        boolean mustSupportManagedProfile = hasManagedProfile()
                || supportManagedProfilesExtra;
        for (int i = 0; i < homeActivities.size(); i++) {
            final ResolveInfo candidate = homeActivities.get(i);
            final ActivityInfo info = candidate.activityInfo;
            ComponentName activityName = new ComponentName(info.packageName, info.name);
            mHomeComponentSet[i] = activityName;
            try {
                Drawable icon = info.loadIcon(mPm);
                CharSequence name = info.loadLabel(mPm);
                HomeAppPreference pref;

                if (mustSupportManagedProfile && !launcherHasManagedProfilesFeature(candidate)) {
                    pref = new HomeAppPreference(context, activityName, prefIndex,
                            icon, name, this, info, false /* not enabled */,
                            getResources().getString(R.string.home_work_profile_not_supported));
                } else  {
                    pref = new HomeAppPreference(context, activityName, prefIndex,
                            icon, name, this, info, true /* enabled */, null);
                }
				 //FLAG_EXCLUDE_FROM_RECENTS这里对应上述的属性 android:excludeFromRecents
				if ((info.flags & ActivityInfo.FLAG_EXCLUDE_FROM_RECENTS) == 0){
                mPrefs.add(pref);
                mPrefGroup.addPreference(pref);
				}
                if (activityName.equals(currentDefaultHome)) {
                    mCurrentHome = pref;
                }
                prefIndex++;
            } catch (Exception e) {
                Log.v(TAG, "Problem dealing with activity " + activityName, e);
            }
        }

        if (mCurrentHome != null) {
            if (mCurrentHome.isEnabled()) {
                getActivity().setResult(Activity.RESULT_OK);
            }

            new Handler().post(new Runnable() {
               public void run() {
                   mCurrentHome.setChecked(true);
               }
            });
        }
    }