https://blog.csdn.net/mlj1668956679/article/details/51983238

在Android开发过程中，有时候我们需要打开第三方应用：

ComponentName componet = new ComponentName(pkg, cls);
                //pkg 就是第三方应用的包名
                //cls 就是第三方应用的进入的第一个Activity
                Intent intent = new Intent();
                intent.setComponent(componet);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);

这里再给出QQ，微博，微信的报名和Activity名称

如何获取pkg和cls

Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        PackageManager mPackageManager = this.getPackageManager();
        List<ResolveInfo> mAllApps = mPackageManager.queryIntentActivities(mainIntent, 0);
        //按报名排序
        Collections.sort(mAllApps, new ResolveInfo.DisplayNameComparator(mPackageManager));

        for(ResolveInfo res : mAllApps){
            //该应用的包名和主Activity
            String pkg = res.activityInfo.packageName;
            String cls = res.activityInfo.name;
            Log.d("pkg_cls","pkg---" +pkg +"  cls---" + cls );

        }