Android launcher 源码 app 的启动方式

关键Java代码路径

Launcher3\src\com\android\launcher3\LauncherModel.java

 private void loadAllApps() {
         

            // Create the ApplicationInfos
            for (int i = 0; i < apps.size(); i++) {
                ResolveInfo app = apps.get(i);
                // This builds the icon bitmaps.
                mBgAllAppsList.add(new AppInfo(packageManager, app,
                        mIconCache, mLabelCache));
            }

可以看到 app快捷方式默认  FLAG_ACTIVITY_NEW_TASK FLAG_ACTIVITY_RESET_TASK_IF_NEEDED 两种flag

 /**
     * Must not hold the Context.
     */
    public AppInfo(PackageManager pm, ResolveInfo info, IconCache iconCache,
            HashMap<Object, CharSequence> labelCache) {
        final String packageName = info.activityInfo.applicationInfo.packageName;

        this.componentName = new ComponentName(packageName, info.activityInfo.name);
        this.container = ItemInfo.NO_ID;
        this.setActivity(componentName,
                Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

        try {
            PackageInfo pi = pm.getPackageInfo(packageName, 0);
            flags = initFlags(pi);
            firstInstallTime = initFirstInstallTime(pi);
        } catch (NameNotFoundException e) {
            Log.d(TAG, "PackageManager.getApplicationInfo failed for " + packageName);
        }

        iconCache.getTitleAndIcon(this, info, labelCache);
    }