Android Dev - Weekly Who's Hiring Thread - March 07, 2022 |
- Weekly Who's Hiring Thread - March 07, 2022
- Jetpack Compose Tutorials i have been working on over a year with subjects Widgets, Layout, SubcomposeLayout, custom Layouts, State, Recomposition, LaunchedEffect, side-effects, Gesture, Navigation, Canvas, and UIs like Whatsapp and more https://github.com/SmartToolFactory/Jetpack-Compose-Tutorials
- Are there functionalities in Android which are easier to implement than in iOS?
- Display a line chart using MPAndroidChart
- Pushing updates to an Unpublished app
- Main thread priority equals background thread priority
- Sending View Model Events to the UI (is this how people are handling Navigation and Snackbars now?)
- Wear OS Complication weirdness
- Optical color pattern recognizer - Android
- MVVM state management using Jetpack Compose
- Got this message after starting an app I hadn't used in a while, how was it made?
- Can anyone with access to a samsung A52s please confirm a bug for me?
- Please Help cant get Android studio to show my app on the AVD
- Using activity instead navigator in composable
- Navigation drawer - cannot return home after navigation
- Triggering LiveData observers
- Null check operator used on a null value
- Best way to a/b two different views in xml?
- please i need help
- Where (app or backend) the data to be shown to the user should be formatted in terms of performance?
- Please help me to optimize code in C++.
- Hi,I am getting back into flutter after 2 years and as i was going through my old apps , i noticed a lot of things have changed and all udemy courses are rather old . So i would like to start with basic crud app with simple login( firebase preferably) can anyone suggest me a good tutorial ?
| Weekly Who's Hiring Thread - March 07, 2022 Posted: 07 Mar 2022 06:00 AM PST Looking for Android developers? Heard about a cool job posting? Let people know! Here is a suggested posting template:
Feel free to include any other information about the job. [link] [comments] | ||
| Posted: 06 Mar 2022 11:48 PM PST
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| Are there functionalities in Android which are easier to implement than in iOS? Posted: 07 Mar 2022 07:52 AM PST Some functionalities seems easier to implement in iOS than Android for e.g. In iOS maintaining the backstack for each bottom menu seems implemented by default. But in Android, we have to write lot of workaround code for it. So I would like to know the vice versa [link] [comments] | ||
| Display a line chart using MPAndroidChart Posted: 07 Mar 2022 03:14 PM PST Hello, I have the following json response back from a GET request: https://gist.github.com/sabiou/8dab51709b59560c0c100c9e024a967b I want to create a simple line chart using the MPAndroidChart library with the following values: - annee for x axis - valeur for y axis Any idea on how I can achieve this ? [link] [comments] | ||
| Pushing updates to an Unpublished app Posted: 07 Mar 2022 04:21 AM PST I'm wondering if anyone has experience with updating an unpublished app regularly. We're on the market for more than 10 years now and we have a Free and a PRO version of our app. We've decided to do it this way, since we couldn't have IAP's in app in our country when the Google Play store was launched. Therefore we needed to launch two separate versions of our app. This is kind of inconvenient for users. Now we want to just offer an IAP in our Free version to remove ads and get the additional features. The problem is that we still have around 100k users on the PRO version. We don't want to abandon those users and still want to provide updates to them. Does anyone have experience with unpublishing an app and then publishing updates regularly to this specific app? Will the paying users still be able to find the PRO version on the Google Play store if we unpublish it? [link] [comments] | ||
| Main thread priority equals background thread priority Posted: 07 Mar 2022 02:11 PM PST We track Thread priority for main threads (nice value. Not JVM thread priority). In 90% of cases, the correct value is set. That is -10. But For 6% of users, it's setting a nice value of 0. background thread priority is also similar. This value is zero across os version and device manufacturer. Can we explicitly set this to -10 by calling Process.setThreadPriority()? Will this have any negative effects? [link] [comments] | ||
| Sending View Model Events to the UI (is this how people are handling Navigation and Snackbars now?) Posted: 07 Mar 2022 03:38 AM PST
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| Wear OS Complication weirdness Posted: 07 Mar 2022 12:20 PM PST I'm seeing something strange in regard to consuming complications, and wondering if there's something I'm missing in all this. My watchface was coded so that the complication was set to accept the SHORT_TEXT type, because I wanted to use it to display the step count on my Fossil Gen 5. First weirdness: Just a minor thing, but on the watch, the step count is listed under "Google Fit." On the Android Studio emulator, it's under "General" (I guess because AFAIK you can't install "Fit" on the emulator), but not on the actual watch. Here's the biggest issue, or confusion, or weirdness. In the code I modified the acceptable complication input to add three additional types:
... and when I did, "Steps" no longer appears as a selectable complication to display on the watch. It only appears if the supportedTypes contains solely SHORT_TEXT. Perhaps I've always misunderstood supportedTypes, but this doesn't make sense to me. Can anybody explain this behavior? [link] [comments] | ||
| Optical color pattern recognizer - Android Posted: 07 Mar 2022 11:28 AM PST Hello, I started learning to program a few months ago, took the CS50 course, watch some youtube courses and know I'm taking a Java course or Coursera. I already developed some simple GUI java applications that interact with databases and excel workbooks, nothing more. I found this video interesting, and started thinking how easy would be to develop an android app that could do what that machines does. https://www.youtube.com/watch?v=BQO95JR3FJY The smartphone camara would be fixed and the background would always be white. The person should place the connector (it will always be in the same positions on the vertical axis, due to the stop), the app should take a picture and the user would define a rectangular area. Some algorithm would get the sequence of colors of that area, that are not white (as the background), and save it as "saved pattern". Then an infinite loop that activate each millisecond, as example, would compare the actual pattern to the "saved pattern". Do you think this is possible, and if so, can you suggest some frameworks or some keywords (for me to search and start learning) that could help me on developing this project, I don't have a starting point yet and never developed any java app for android. Much appreciated. [link] [comments] | ||
| MVVM state management using Jetpack Compose Posted: 07 Mar 2022 04:24 AM PST
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| Got this message after starting an app I hadn't used in a while, how was it made? Posted: 07 Mar 2022 01:07 AM PST
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| Can anyone with access to a samsung A52s please confirm a bug for me? Posted: 07 Mar 2022 03:15 AM PST Hi all, an update to my app just went live and i'm seeing an odd behaviour on my Samsung a52s, but not on the Huawei device I also have. I don't have access to any more physical devices to check the issue. If you wouldn't mind downloading the app and pressing two buttons simultaneously, i'd really appreciate it, let me know and I'll tell you the specifics over DM. Thanks a lot [link] [comments] | ||
| Please Help cant get Android studio to show my app on the AVD Posted: 07 Mar 2022 06:09 AM PST
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| Using activity instead navigator in composable Posted: 06 Mar 2022 08:57 PM PST Does it make sense to use activity per screen that hold composable, and navigate between them with intent startActivity, instead of one main activity with all composable screens inside navigator? will performance hurt? [link] [comments] | ||
| Navigation drawer - cannot return home after navigation Posted: 07 Mar 2022 05:22 AM PST Hi, I created a new project with Navigation Drawer Acitvity template. I added a new button to my home fragment, than created a new navigation action to my gallery fragment. Than set up the onclicklistener to navigate: After the click of the button I can navigate to my gallery fragment, but when I open the navigation drawer I can navigate everywhere, but home. Sample project: https://github.com/totokpatrik/NavigationTest any help is appriciated [link] [comments] | ||
| Posted: 07 Mar 2022 04:27 AM PST Hi. During the start of the app, I request for the list of profiles from Room database and observer is set. When I insert a new profile and also set its observer, the observer that is triggered is only from this insertion. To my understanding, LiveData observers will be triggered if there are changes from the database especially if they are on the same table whether insertion or just requesting a list. Am I wrong with this? Should I call again the profile list request to trigger its observer and get the updated list? Thank you! [link] [comments] | ||
| Null check operator used on a null value Posted: 07 Mar 2022 03:47 AM PST class _HomePageState extends State<HomePage> { LatLng? _pickUp; void getCurrentLocation() async { void _onMapCreated(GoogleMapController controller) async { } ... GoogleMap( } Despite that I have assigned my _pickup in _onMapCreated, the _pickUp! used in target results in the title error, may i know whats the reason for this? [link] [comments] | ||
| Best way to a/b two different views in xml? Posted: 06 Mar 2022 11:11 PM PST I'm using an imageview in xml right now. I've created a new custom Imageview class. I want to use this new class conditionally in XML, so control group is old view and test group is new view. What's the best way to accomplish this? Would a view stub work? [link] [comments] | ||
| Posted: 07 Mar 2022 09:46 AM PST my mi 9t go into fastboot automatically i cant get around it it start when i gave naptime battery saver app permission to disable google services when screen is off then the phone restarted into fastboot THINGS I HAVE TRIED: 1- using twrp i wiped cache, system, and data and flashed stock rom miui 12.0.8.0 (i had miui 12.0.9.0 before) after that instead of booting into fast boot it boot into twrp [link] [comments] | ||
| Where (app or backend) the data to be shown to the user should be formatted in terms of performance? Posted: 07 Mar 2022 01:22 AM PST For e.g. we maybe required to show the field representing amount whose value is 1000 as ₹ 1000.00, date stored in database as 2022-03-07 10:00:00 need to display to user as 7 Mar 2022 10:00 AM etc. So whether we should write the code for the formatting/conversion in the app or the backend with response also containing the display value? My doubt is if more code in backend will take more time to fetch data from backend. If more code in app make it slower (on low end devices) [link] [comments] | ||
| Please help me to optimize code in C++. Posted: 07 Mar 2022 12:34 AM PST Now question is when I using large capacity usb flash disk ota(16G,100,000 files) it will reboot. I check source code finding the reason it was Check function, so I add some code below.Now the flash disk don't reboot . but how can I opimize code to kill thread and fix large more disk (ex.256G flash disk)? My os is Android automotive10,ram and rom is 4+32G, cpu is mx8q the diff file is diff --git a/system/vold/fs/Vfat.cpp b/system/vold/fs/Vfat.cpp old mode 100644 new mode 100755 index 4f1e982eb3..d2bac6fc7b --- a/system/vold/fs/Vfat.cpp +++ b/system/vold/fs/Vfat.cpp @@ -41,7 +41,30 @@ #include "Utils.h" #include "Vfat.h" #include "VoldUtil.h" - +#include "../../core/libutils/include/utils/Thread.h" //wp add +#include <inttypes.h> +#include <pwd.h> +#include <sched.h> +#include <signal.h> +#include <stdbool.h> +#include <sys/cdefs.h> +#include <sys/epoll.h> +#include <sys/eventfd.h> +#include <sys/resource.h> +#include <sys/socket.h> +#include <sys/sysinfo.h> +#include <sys/time.h> +#include <time.h> +#include <unistd.h> +#include <cutils/properties.h> +#include <cutils/sched\_policy.h> +#include <cutils/sockets.h> +#include <../../core/lmkd/include/lmkd.h> +#include <log/log.h> +#include <log/log\_event\_list.h> +#include <log/log\_time.h> +#include <../../core/lmkd/libpsi/include/psi/psi.h> +#include <system/thread\_defs.h> using android::base::StringPrintf; namespace android { @@ -55,10 +78,32 @@ bool IsSupported() { return access(kMkfsPath, X_OK) == 0 && access(kFsckPath, X_OK) == 0 && IsFilesystemSupported("vfat"); } +//wp add +class CheckThread:public Thread { +public: + CheckThread(std::vector<std::string> cmd, int fd): + mCmd(cmd),mFd(fd) { + } + virtual ~CheckThread() { + } + + virtual bool threadLoop() { + //int rc = ForkExecvp(mCmd, sFsckUntrustedContext);//fork进程，check卡等待结果 + int rc = ForkExecvp(mCmd, nullptr, sFsckUntrustedContext); + write(mFd, &rc, sizeof(int));//把结果写入管道 + LOG(WARNING) << "xwg:rc = " << rc; + return false;//返回false,不循环了 + } + +private: + std::vector<std::string> mCmd; + int mFd; +}; //wp end + status_t Check(const std::string& source) { int pass = 1; - int rc = 0; + int rc = 3; do { std::vector<std::string> cmd; cmd.push_back(kFsckPath); @@ -66,9 +111,41 @@ status_t Check(const std::string& source) { cmd.push_back("-f"); cmd.push_back("-y"); cmd.push_back(source); - + //wp add + int pipefd[2]; + if (pipe(pipefd) < 0) { //管道 + LOG(INFO) << "xwg 0303 pipe failed"; + return -1; + } + CheckThread* thread = new CheckThread(cmd, pipefd[1]); + thread->run("");//开启线程，执行fork进程，等待结果，同时把管道一端给它 + int mEpollFd = epoll_create(2); + struct epoll_event eventItem; + memset(& eventItem, 0, sizeof(epoll_event)); + // zero out unused members of data field union + eventItem.events = EPOLLIN; + eventItem.data.fd = pipefd[0]; + epoll_ctl(mEpollFd, EPOLL_CTL_ADD, pipefd[0], & eventItem); + struct epoll_event eventItems[2]; + int eventCount = epoll_wait(mEpollFd, eventItems, 2, 10000);//使用epoll机制，设置timeout为5min + LOG(WARNING) << "xwg:eventConut = "<<eventCount; + for (int i = 0; i < eventCount; i++) { + LOG(WARNING) << "xwg:int i = "<<i; + int fd = eventItems[i].data.fd;//有管道数据，说明check好了，返回结果就在管道中 + LOG(WARNING) << "xwg:fd = "<<fd; + uint32_t epollEvents = eventItems[i].events; + if (fd == pipefd[0]) { + if (epollEvents & EPOLLIN) { + read(fd, &rc, sizeof(int)); + } + } + }//end for,直接timeout了，说明10秒还没有check完 + close(mEpollFd); + close(pipefd[0]);//关闭fd + close(pipefd[1]); + //wp end // Fat devices are currently always untrusted - rc = ForkExecvp(cmd, nullptr, sFsckUntrustedContext); + rc = 0; if (rc < 0) { LOG(ERROR) << "Filesystem check failed due to logwrap error"; @@ -86,6 +163,12 @@ status_t Check(const std::string& source) { errno = ENODATA; return -1; + case 3://3说明check超时了,wp add + //SLOGE("xwg 0303 Filesystem check outime"); + LOG(INFO) << "xwg 0303 Filesystem check outime"; + errno = ENODATA; + return -1; + case 4: if (pass++ <= 3) { LOG(WARNING) << "Filesystem modified - rechecking (pass " << pass << ")"; [link] [comments] | ||
| Posted: 07 Mar 2022 12:06 AM PST |
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