Android bluetooth 4 0 how to set bluetooth write permission

Basic steps: get bluetoothadapter blueadapter=;

If the Bluetooth adapter is null, the Android phone does not have a Bluetooth module.

Check whether the Bluetooth module is turned on, true means it has been turned on, and false means that Bluetooth is not enabled.

Start configuring Bluetooth visible mode, that is, enter the pairable modeintent in=new intent(;

startactivity(in);200 means 200 seconds.

Get the paired device in the Bluetooth adapter setdevice=;

You also need to declare permissions for Bluetooth in .

The next step is to operate the Bluetooth adapter according to your needs.

Tell you, you can't brush the machine.

Generic Attribute Profile (GATT) is a general specification for reading and writing small data in attribute classes through BLE connections. All BLE application profiles are now GATT-based.

Attribute Protocol (ATT)GATT is based on the ATT Protocol. ATT is specifically optimized for BLE devices, which is to use as little data as possible during transmission. Each property has a unique UUID, and the property will be transferred in the form of characteristics and services.

characteristic

Characteristic can be thought of as a data type that consists of a value and a description of 0 to more secondary values (descriptor).

The first step,**Android apk,There is a cracked search by yourself,Second,Open and find the Bluetooth app you wrote inside,Third,Select it pop-up option,Select make coexistence,It's OK。

If the Bluetooth device itself supports it, the call should be the same in the upper-layer application.

Some Bluetooth headsets do not support connecting multiple devices, some can, the one I bought supports the use of two devices at the same time, and the technology of each headset is different.

Bluetooth is just a communication method, there should be no limit, I have done below Bluetooth before, connect 10 Bluetooth printers, there is no problem, the power consumption at the end of the year, theoretically there should be no limit.

1. All of them are serial communication under the Android system.

Enumerate the files in the dev directory, which is a list of Android devices, and you can look for them, including Bluetooth devices.

Bluetooth itself is a serial port communication, and under Android, it is a way to read and write files to send and receive serial port data.

Then you need to get read and write permissions, but the problem is that after you get permissions, Delphi XE can open files, but I don't know how to set the baud rate. No information was found.

So my final solution was to write a SO library file for sending and receiving serial ports on Android in C, and then Delphi to call this SO file. In this way, delphi realizes the control of the serial port.

Bluetooth is a serial communication, and you can do whatever you want after sending and receiving data.