新开启个线程来做获取，否则可能因为在主线程时间太长导致获取不全

       new Thread(new Runnable() {
            @Override
            public void run() {
                PackageManager packageManager = getPackageManager();
                List<PackageInfo> installedPackages = packageManager.getInstalledPackages(0);
                for (PackageInfo packageInfo : installedPackages){
                    ApplicationInfo applicationInfo = packageInfo.applicationInfo;
                    if ((applicationInfo.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0){     
                       Log.v("fancy",applicationInfo.loadLabel(packageManager).toString()+"====="+applicationInfo.packageName);
                    }
                }
            }
        }).start();