When we use adb push $file /mnt/sdcard on Android 11 devices, we will encounter adb: error: stat failed when trying to push to /mnt/sdcard/: Permission denied error message. This article will introduce how to solve the problem and share related thoughts.

Firebase is the most widely used message push tool on Android. If the Android app on the background, both received and processed messages are processed by the system. So this article will introduce and provide a demo project for quick testing FCM.

Two months ago, Google released the In-App Review API, allowing users to complete ratings and reviews without jumping out of the application. I added this feature to the open source application wake up screen. This article will introduce how to integrate it and the problems I encountered.

Android’s screen fragmentation problem has a long history. Generally, we use the same physical size on different devices. Such a solution does not completely restore the design draft, and the situation of individual adaptation will appear more frequently as the size of the project increases.

The [“Wake Up Screen”] written in spare time has been iterated over a dozen versions. As a lightweight application, the size is maintained at around 13MB because of the different architectures of the library. I tried the App Bundle this weekend and successfully reduced the app size by about 50%.

One day, we received feedback from the operator that a GIF banner could not be played on the website, and it was normal on the APP side. The operator indicated that the last configuration of GIF banner was normal, and gave the picture links of the two configurations.

Recently, we have made some cross-platform migration attempts, from pure RN architecture applications to general cross-platform applications. The migration process involves cross-platform technologies such as React Native and Flutter, and also encountered many problems. This article briefly records some of them and hoping to bring a little help to the reader.

When I reviewed the notes, I found that this article was not uploaded to the blog. Although the code implementation is outdated, the idea has been used all the time, so today I simply sorted the content and sent it to the blog.

Auto-playing of the video is a common application scenario, which involves sliding distance monitoring of lists, lifecycle perception of pages, and changes in video state. This article describes an automatic playback architecture design for RecyclerView component.

For a long time in the past, the online availability rate of the Android app has remained at around XX.X%. In recent months, a large number of TimeoutExceptions have been found in the statistics. In order to affect the number of users, XX of TopXX’s crashes are caused by similar problems.

From the statistics of the problem, more than XX% appear in the OPPO R9 series system, XX% occur in the background, the vast majority occurred before and after the application started X minutes, Android system version X.X and X.X accounted for And more than XX%, the proportion of non-Root users exceeds XX%. Based on the various data, this is a problem that occurs in a specific model/system, which is less sensible to users and has a higher incidence rate.

The user experience is a vital part of the application, so taking the time to analyze and solve the problem.

The need for an iteration is to achieve a hover effect on the page, considering that CoordinatorLayout has passed a number of versions of BugFix, it should be relatively stable. So try to implement hover directly with CoordinatorLayout+AppBarLayout. As the type of head layout continues to increase, the length gradually becomes larger, so the problem is unexpectedly discovered during the sliding process. Since the official is not repaired, the problem can only be repaired using the custom Behavior.

Google updated the Draw Path implementation on the Android Pie system, so compatibility issues arise when creating custom graphics using Xfermode.

We usually connect the printer to Windows using USB and Wifi, but for some models, the system also needs to install the printer driver. Calling the printer on Android is slightly different.

Before Android 4.4, a third-party solution was needed to implement the printing function, or a protocol for communicating with the printer was implemented. After 4.4, Android introduced the Print class as a printing tool class, such as PrintHelper for printing. Bitmap, PrintPdfDocument to print the document.

It is relatively easy to implement voice broadcast on Android. The first reaction is to use the TTS that comes with the system. However, the support for Chinese is not good. Secondly, it is inconvenient to customize the voice effect. Third-party voice broadcast solutions are a natural choice.

There are many third-party voice broadcast programs, such as Xunfei, Baidu, and Unisound. This article uses offline broadcast programs. Xunfei’s offline charges are not low. Baidu is the default network, so only Unisound is optional.

Unisound’s vision into the public should be at the launch of the Smartisan. Like every open platform, you must first register as a developer.