Wireless image transmission technology has become an integral part of the modern ecosystem of mobile devices, allowing you to instantly broadcast content from your smartphone screen to a large TV or monitor display. In the operating system Android 9 Pie functionality Miracast is integrated quite deeply, however, manufacturers often hide this option under different names or place it in specific sections of the menu. Users often encounter a situation where the standard “Broadcast” button does not appear in the notification shade, which causes confusion and requires manual search for settings.
To successfully launch the screen mirroring process, you need to understand that your gadget and the receiving device must support a single communication standard. In most cases, we are talking about the protocol Wi-Fi Direct, which is the physical basis for Miracast to work. If you are the owner of a device based on Android 9, then the chances of a successful connection are extremely high, since this version of the OS ensures stable operation of network modules and correct encoding of the video stream in real time.
In this article we will analyze in detail all the nuances of activating a wireless display, consider hidden developer settings and offer solutions for common connection errors. You will learn how to find the treasured function in the jungle of the system menu and what to do if the TV does not see your phone. A critical condition is support for the Wi-Fi Direct standard on the part of the receiving device; without this, hardware communication is impossible.
The principle of operation of the technology and hardware requirements
Technology Miracast is a standard for wireless transmission of multimedia content developed by the Wi-Fi Alliance consortium. Unlike Chromecast, which requires a router and an intermediary app, Miracast creates a direct connection between devices. This means that your smartphone Android 9 and TV or adapter exchange data directly using their own network interfaces. This architecture ensures minimal signal delay, which is especially important when demonstrating presentations or playing games.
For correct operation of the system, a number of technical requirements must be met. Firstly, both devices must support the protocol Wi-Fi Direct. Secondly, the corresponding data transfer module must be active on the smartphone side. In Android 9, this feature is often called "Wireless Display" or "Cast". It is important to note that some manufacturers, such as Xiaomi or Huawei, may use their own names for this service, for example, "Mi Drop" or "Wireless Projection".
The quality of the transmitted image directly depends on the processor power and the version of the wireless module. Smartphones in the middle and high price segments are usually equipped with chips capable of encoding a video stream in resolution 1080p or even 4K without significant losses in frame rate. Budget models may limit resolution or cause stuttering when actively using the interface during a broadcast.
⚠️ Attention: Make sure that Miracast signal reception is enabled on your TV. In the TV menu it may be called Screen Share, Anyview Cast, Smart View, or simply Wireless Monitor.
It is also worth considering power consumption. Active video streaming over the air is a power-intensive process that can quickly drain your battery. It is recommended to keep the device connected to a charger or have a power bank on hand if you plan to display content for a long time. The stability of the connection also depends on the presence of interference on the air at a frequency of 2.4 GHz or 5 GHz.
Searching for and activating a function in the standard Android 9 menu
The first step in setting up is to find the standard entry point to the broadcast menu. In “pure” Android 9 this option is usually located in the quick settings panel. Expand the notification shade by swiping down and look for a tile called “Broadcast”, “Cast” or a screen icon with a Wi-Fi icon. If you don’t find it right away, click on the pencil or three dots to edit the list of tiles - perhaps the function is simply hidden in an inactive area.
An alternative path is through the main system settings. Go to section Settings → Connected devices → Connection settings. There may be a "Broadcast" item here. In some shells, for example One UI from Samsung or MIUI from Xiaomi, the path may be different. Manufacturers often include this function in the “Additional functions” or “Connections and sharing” section.
After activating the function, the smartphone will begin searching for available devices within range. A list of found displays will appear on the screen. Select your TV or adapter from the list. The pairing process may take from a few seconds to a minute. If the connection request appears on the TV screen, confirm it using the remote control.
If the "Broadcast" tile is not in the curtain, try adding it through the quick settings editing menu by holding your finger on the pencil or three dots icon.
In some cases, the system may require you to enable geolocation to search for devices, although technically this is not always necessary for Wi-Fi Direct. This requirement is due to the peculiarities of Wi-Fi scanners in the latest versions of Android, which tie the search for networks to permission to access the location. Allow the application access if prompted.
Settings through the menu for developers
If you cannot activate the wireless display using standard methods, you should turn to the advanced system settings. There is a special menu for developers where you can force Wi-Fi Display certification to be enabled. To enter this menu, you must first activate the developer mode by seven times clicking on the build number in the section Android 9 There is a special menu for developers where you can force enable Wi-Fi Display certification. To enter this menu, you must first activate developer mode by tapping seven times on the build number in the section Settings → About phone.
After unlocking the developer mode, go to the section System → For developers. Scroll down to the Network or Media section. Look for an item that may be called "Enable Wi-Fi Display certification" or "Force Wi-Fi Display certification." Activating this switch makes visible to the system even those devices that do not have official certification, but support the protocol.
☑️ Activating developer mode
Also in this section, the "Wireless display status" option may be available, which allows you to see technical details of the current connection or force a search. Use of these tools requires caution, as changing system settings may affect the stability of other network functions.
⚠️ Warning: Do not change other settings in the developer menu unless you are sure of their purpose. This may lead to system instability or problems with Bluetooth and Wi-Fi.
After making changes, it is recommended to restart the device. This will allow system services to correctly initialize new parameters and begin scanning the airwaves with updated rules. If after rebooting the function still does not work, the problem may be hardware incompatibility or an outdated Wi-Fi module driver.
What to do if the developer menu is empty?
If after activating the mode you do not see the necessary items, try clearing the Settings application cache or updating the system software to the latest available version.
Using third-party applications for broadcasting
When the built-in tools Android 9 do not cope with the task or are unstable, third-party solutions from the store Google Playcome to the rescue. There are many applications that emulate Miracast or use alternative protocols to transmit images. Popular utilities, such as Screen Mirroring or Cast to TV, can bypass the manufacturer's software restrictions.
The principle of operation of such applications is often to install their own server on the phone, which broadcasts the stream to the receiving device. Some of them require installing a companion app on the TV or using the built-in TV browser to receive the signal. This adds a step in setup, but often provides better compatibility with older TV models.
When choosing an application, pay attention to the presence of advertising and watermarks, which may be superimposed on the streamed image in free versions. Paid versions usually offer higher resolution and no lag. Also check user reviews to ensure that Android 9 support is up to date.
| Application name | Connection type | Android 9 support | Features |
|---|---|---|---|
| Screen Mirroring SmartCast | Wi-Fi Direct / DLNA | Full | Automatic device search |
| Cast to TV - XCast | Local network | Full | Support for Chromecast and Miracast |
| WiFi Display | Direct connection | Partial | Requires root access for some functions |
| AirScreen (for TV) | Receiver | N/A (for TV) | Turns the TV into an AirPlay/Miracast receiver |
Using third-party software is a compromise solution. It gets the job done, but may consume more battery resources and place additional load on the processor. If your goal is to regularly use the broadcast, it is better to deal with the factory settings or update the device firmware.
Third-party applications are an effective way to bypass manufacturer restrictions, but they can reduce the performance of the smartphone during operation.
Diagnosing and solving connection problems
The most common problem is when the TV is simply does not appear in the list of available devices. First of all, check whether both gadgets are in the same frequency range. Although Wi-Fi Direct does not require a router, some implementations of the protocol work more reliably if both devices are connected to the same Wi-Fi network. Try switching your smartphone from 5 GHz to 2.4 GHz or vice versa.
Another common reason is that the power saving mode is turned on. A Android 9 aggressive battery saving algorithms can turn off the Wi-Fi module in the background or limit its power. Disable power saving mode during setup and make sure that system services are allowed to run in the background.
If the connection is established, but the picture freezes or the sound disappears, the problem may be channel congestion. Try reducing the broadcast resolution in your phone settings or bringing the devices closer to each other. Walls and metal obstacles can significantly weaken the Wi-Fi Direct signal.
⚠️ Warning: Outdated software on the TV may cause incompatibility. Check for firmware updates for your TV in its system menu.
In rare cases, resetting the network settings on your smartphone helps. This action will clear saved Wi-Fi passwords and Bluetooth settings, but often resolves driver conflicts. You can perform a reset in the section Settings → System → Reset settings → Reset Wi-Fi, mobile data and Bluetooth settings.
Why does the sound disappear during broadcast?
Some TVs do not support audio streaming via Miracast or require switching the audio source in the TV settings to external login.
Comparison of Miracast with alternative technologies
Users often confuse Miracast with technology Google Cast (Chromecast). These are fundamentally different standards. Miracast duplicates the entire smartphone screen one to one, including notifications and interface, while Google Cast transfers only the content of a specific application (video from YouTube, photos from the Gallery), allowing you to use the phone for other tasks. Another competitor is the protocol from Apple, which is now supported by many modern TVs. If you have Apple devices in your home, it may make sense to use them for streaming, as they often provide a smoother picture. However, for Android devices, Miracast remains the most universal and native solution.
Another competitor is the protocol AirPlay from Apple, which is now supported by many modern TVs. If you have Apple devices in your home, it may make sense to use them for streaming, as they often provide a smoother picture. However, for Android devices, Miracast remains the most universal and native solution.
The choice of technology depends on your tasks. For games and presentations, where it is important to see everything that happens on the phone on a big screen, Miracast is indispensable. For watching movies in the background, Cast is better. B Android 9 these technologies can coexist, and the broadcast menu often combines searches for both types of devices.
It is worth noting that TV manufacturers may implement support for these standards in different ways. For example, Samsung uses its own version based on Miracast, and LG often relies on its own implementations. Always check the instructions for your TV to understand which standard it supports out of the box.
Miracast is ideal for full screen mirroring, while Google Cast is better suited for streaming media content without the distraction of the phone.
Why doesn't the "Broadcast" function appear in the notification shade?
This may be due to your shell interface settings. Go to edit quick settings and drag the broadcast icon to the active zone. Also check if the service is disabled in the application menu.
Can I use Miracast without the Internet?
Yes, Wi-Fi Direct technology creates a direct connection between devices, so access to the global Internet is not required. However, for the initial setup of some Smart TVs, a network may be required.
Does broadcasting affect the speed of the smartphone?
Yes, real-time video encoding loads the processor and graphics accelerator. On older or low-end Android 9 models, this can lead to a slower interface.
How to disable audio transmission to the TV?
In standard Android settings, separate audio and video controls are usually not provided for Miracast. The sound is transmitted along with the image. You can disable it only through the volume settings on the TV itself.
Does Android 9 support 4K transmission via Miracast?
Theoretically, yes, if the hardware of the smartphone and TV supports this resolution. However, in practice, stable 4K transmission over the air is rare due to the high load on the communication channel.