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

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/kkguo1990/article/details/75127047

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;
}