android setupwizard launcher app启动优先级(未验证)

记录mainfest  priority优先级决定app启动流程

<activity android:name="com.android.setupwizard.activity.DefaultMainActivity">    <intent-filter android:priority="1">        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.HOME" />        <category android:name="android.intent.category.LAUNCHER" />    </intent-filter></activity>

app 启动为：

ActivityManagerService.java  
>>startHomeActivityLocked();

决定启动哪个app

Intent getHomeIntent() {    Intent intent = new Intent(mTopAction, mTopData != null ? Uri.parse(mTopData) : null);    intent.setComponent(mTopComponent);    intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);    if (mFactoryTest != FactoryTest.FACTORY_TEST_LOW_LEVEL) {        intent.addCategory(Intent.CATEGORY_HOME);    }    return intent;}

>>>   systemReady  

if (mFactoryTest == FactoryTest.FACTORY_TEST_LOW_LEVEL) {    ResolveInfo ri = mContext.getPackageManager()            .resolveActivity(new Intent(Intent.ACTION_FACTORY_TEST),                    STOCK_PM_FLAGS);    CharSequence errorMsg = null;    if (ri != null) {        ActivityInfo ai = ri.activityInfo;        ApplicationInfo app = ai.applicationInfo;        if ((app.flags&ApplicationInfo.FLAG_SYSTEM) != 0) {            mTopAction = Intent.ACTION_FACTORY_TEST;            mTopData = null;            mTopComponent = new ComponentName(app.packageName,                    ai.name);        } else {            errorMsg = mContext.getResources().getText(                    com.android.internal.R.string.factorytest_not_system);        }    } 
>> 
mTopComponent >> 
 mContext.getPackageManager()            .resolveActivity
>>>ContextImpl.java
>>> resolveActivity  

>>>  mPM.resolveIntent

PackageManagerService.java  resolveIntent

>>>chooseBestActivity 可以看到选择优先级的问题

private ResolveInfo chooseBestActivity(Intent intent, String resolvedType,        int flags, List<ResolveInfo> query, int userId) {    if (query != null) {        final int N = query.size();        if (N == 1) {            return query.get(0);        } else if (N > 1) {            final boolean debug = ((intent.getFlags() & Intent.FLAG_DEBUG_LOG_RESOLUTION) != 0);            // If there is more than one activity with the same priority,            // then let the user decide between them.            ResolveInfo r0 = query.get(0);            ResolveInfo r1 = query.get(1);            if (DEBUG_INTENT_MATCHING || debug) {                Slog.v(TAG, r0.activityInfo.name + "=" + r0.priority + " vs "                        + r1.activityInfo.name + "=" + r1.priority);            }            // If the first activity has a higher priority, or a different            // default, then it is always desirable to pick it.            if (r0.priority != r1.priority                    || r0.preferredOrder != r1.preferredOrder                    || r0.isDefault != r1.isDefault) {                return query.get(0);            }            // If we have saved a preference for a preferred activity for            // this Intent, use that.            ResolveInfo ri = findPreferredActivity(intent, resolvedType,                    flags, query, r0.priority, true, false, debug, userId);            if (ri != null) {                return ri;            }            ri = new ResolveInfo(mResolveInfo);            ri.activityInfo = new ActivityInfo(ri.activityInfo);            ri.activityInfo.labelRes = ResolverActivity.getLabelRes(intent.getAction());            // If all of the options come from the same package, show the application's            // label and icon instead of the generic resolver's.            // Some calls like Intent.resolveActivityInfo query the ResolveInfo from here            // and then throw away the ResolveInfo itself, meaning that the caller loses            // the resolvePackageName. Therefore the activityInfo.labelRes above provides            // a fallback for this case; we only set the target package's resources on            // the ResolveInfo, not the ActivityInfo.            final String intentPackage = intent.getPackage();            if (!TextUtils.isEmpty(intentPackage) && allHavePackage(query, intentPackage)) {                final ApplicationInfo appi = query.get(0).activityInfo.applicationInfo;                ri.resolvePackageName = intentPackage;                if (userNeedsBadging(userId)) {                    ri.noResourceId = true;                } else {                    ri.icon = appi.icon;                }                ri.iconResourceId = appi.icon;                ri.labelRes = appi.labelRes;            }            ri.activityInfo.applicationInfo = new ApplicationInfo(                    ri.activityInfo.applicationInfo);            if (userId != 0) {                ri.activityInfo.applicationInfo.uid = UserHandle.getUid(userId,                        UserHandle.getAppId(ri.activityInfo.applicationInfo.uid));            }            // Make sure that the resolver is displayable in car mode            if (ri.activityInfo.metaData == null) ri.activityInfo.metaData = new Bundle();            ri.activityInfo.metaData.putBoolean(Intent.METADATA_DOCK_HOME, true);            return ri;        }    }    return null;}