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· 错误的方法：

public static List<PackageInfo> getAllApplication(Context context, boolean needActivities) {
        PackageManager packageManager = context.getPackageManager();
        return packageManager.getInstalledPackages(needActivities ? PackageManager.GET_ACTIVITIES : 0);
    }

这是目前网上最流行，也是看上去语义最贴合实际的方法，然而，经过博主项目的大量测试，发现此方法存在三个致命问题：

1、获取了很多系统服务：这些服务是没有Activity、并且无法通过去掉系统APP被筛除的

2、获取不到完整的APP列表：在博主的测试中，经常发现扫描不到某QQ、某视频等APP的BUG

3、获取不到APP的启动Activity：这种方式只能获取到APP所有的Activity，至于LauncherActivity是哪个，无从得知。尽管多数APP的Manifest文件首项就是LauncherActivity，但仍有很多反其道而行的应用，如：某QQ

综上所述，楼主极不推荐使用packageManager.getInstalledPackages方式获取应用列表！

· 推荐的方法：

//获取用户安装的APP
    public static List<ResolveInfo> getInstalledApplication(Context context, boolean needSysAPP) {
        PackageManager packageManager = context.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(intent, 0);
        if (!needSysAPP) {
            List<ResolveInfo> resolveInfosWithoutSystem = new ArrayList<>();
            for (int i = 0; i < resolveInfos.size(); i++) {
                ResolveInfo resolveInfo = resolveInfos.get(i);
                try {
                    if (!isSysApp(context, resolveInfo.activityInfo.packageName)) {
                        resolveInfosWithoutSystem.add(resolveInfo);
                    }
                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                }
            }
            return resolveInfosWithoutSystem;
        }
        return resolveInfos;
    }

    //判断是否系统应用
    public static boolean isSysApp(Context context, String packageName) throws PackageManager.NameNotFoundException {
        PackageInfo packageInfo = context.getPackageManager().getPackageInfo(packageName, 0);
        return (packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 1;
    }

· 一些常见数据的获取：

//包名
resolveInfo.activityInfo.packageName
 
//启动Activity
resolveInfo.activityInfo.name 
 
//APP名
resolveInfo.activityInfo.applicationInfo.loadLabel(getPackageManager())
 
//Icon
resolveInfo.activityInfo.applicationInfo.loadIcon(getPackageManager())
 
//APK安装包路径
resolveInfo.activityInfo.applicationInfo.sourceDir