Android library for communication with thermal printers via Bluetooth. This library is only compatible with androidx.
Add jitpack.io to your root build.gradle:
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}Finally add the dependency to your app build.gradle:
dependencies {
implementation "com.github.isradeleon:ThermalPrinter:1.0.3"
}This library includes the code for the bluetooth connection. All you need to do is first to start the ConnectBluetoothActivity:
override fun onCreate(savedInstanceState: Bundle?) {
...
startActivityForResult(
Intent(this, ConnectBluetoothActivity::class.java),
ConnectBluetoothActivity.CONNECT_BLUETOOTH
)
}You'll get Activity.RESULT_OK if the device was successfully connected via bluetooth:
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if(resultCode == Activity.RESULT_OK && requestCode == ConnectBluetoothActivity.CONNECT_BLUETOOTH){
// ThermalPrinter is ready
ThermalPrinter.instance
.write("Hello world", PrintAlignment.CENTER, PrintFont.LARGE)
.fillLineWith('-')
.write("Let's eat","some tacos")
.write("Price","0.5 USD")
.writeImage(BitmapFactory.decodeResource(getResources(), R.drawable.panda))
.print()
}
}If you want to set or modify the BluetoothSocket by yourself, you can do it with the BluetoothConnection class. ThermalPrinter uses this socket to send all its commands to the printer.
| Method | Description |
|---|---|
| print() | Prints all the written content |
| write(text: String) | Writes text to thermal printer |
| write(text: String, alignment: PrintAlignment) | Writes text and sets the text alignment |
| write(text: String, alignment: PrintAlignment, font: PrintFont) | Writes text, sets text alignment and font size |
| write(key: String, value: String) | Writes a line with key value pair |
| write(key: String, value: String, separator: Char) | Writes a line with key value pair and fills space with separator |
| writeImage(bitmap: Bitmap) | Writes an image to thermal printer. Image must be black and white format |
| newLine() | Writes a new line to thermal printer |
| fillLineWith(char: Char) | Writes a line filled with the specified char |
This library uses Thermal Printer in Android code for image printing.
This library is licensed under MIT license. View license.