ApiDemos main activity

       /**
         * 将AndroidManifest.xml文件中所有Intent action是ACTION_MAIN
         * 及category是CATEGORY_SAMPLE_CODE的activity全部取得。放入list中。
         * zbtu 2012-11-5 11:25:12
         */
        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_SAMPLE_CODE);

        PackageManager pm = getPackageManager();
        List<ResolveInfo> list = pm.queryIntentActivities(mainIntent, 0);

Intent.CATEGORY_LAUNCHER的应用

       // 获取已经安装程序列表   
        PackageManager pm = mContext.getPackageManager();   
        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);   
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);   
        List<ResolveInfo> list = pm.queryIntentActivities(mainIntent,0);  

REFERENCES:http://blog.csdn.net/qiqihar/article/details/6956736

http://cache.baidu.com/c?m=9d78d513d9981de90fb1d2690c66c0666e4381136d8496422a89d30384652b564012f4ba5763435b919b2b7000df5e5b9ee73702665e76e08f8fc814d2e1d46e6d9f26476d01c30457c419d8cb17639c37902db8f246fae3a42f93acd1d3dd574ec950017d85fa9c5a774e8c30ae&p=9979c71c85cc42a405bd9b7d0a16cf7c&newp=8f759a46d1c302f700be9b7d060a94325c5bc4387ebad6147d97cb10&user=baidu&fm=sc&query=Intent%2ECATEGORY_SAMPLE_CODE&qid=e0b160ea1257fb97&p1=1