gps

GPS driver for Android Things

This driver supports GPS peripherals that generate NMEA location sentences over UART.

NOTE: these drivers are not production-ready. They are offered as sample implementations of Android Things user space drivers for common peripherals as part of the Developer Preview release. There is no guarantee of correctness, completeness or robustness.

How to use the driver

NOTE: on Raspberry Pi 3 you need to disable the serial debugging console using the following instructions in order for the driver to be able to access the UART port.

Gradle dependency

To use the gps driver, simply add the line below to your project's build.gradle, where <version> matches the last version of the driver available on jcenter.

dependencies {
    compile 'com.google.android.things.contrib:driver-gps:<version>'
}

Sample usage

import com.google.android.things.contrib.driver.gps.NmeaGpsModule;

// Access the GPS module:

NmeaGpsModule mGpsModule;

try {
    mGpsModule = new NmeaGpsModule(
            uartPortName,
            baudRate        // specified baud rate for your GPS peripheral
    );
    mGpsModule.setGpsAccuracy(accuracy); // specified accuracy for your GPS peripheral
    mGpsModule.setGpsModuleCallback(new GpsModuleCallback() {
        // overridden methods
    });
} catch (IOException e) {
    // couldn't configure the gps module...
}

// Close the GPS module when finished:

try {
    mGpsModule.close();
} catch (IOException e) {
    // error closing gps module
}

Instead of reading location directly, you can register the GPS module with the system and receive location updates using the Location APIs:

NmeaGpsDriver mGpsDriver;

try {
    mGpsDriver = new NmeaGpsDriver(
            this,           // context
            uartPortName,
            baudRate,       // specified baud rate for your GPS peripheral
            accuracy        // specified accuracy for your GPS peripheral
    );

    mGpsDriver.register();

    // At this point you can get the current location and request updates using the location APIs
    // provided by Google Play Services (or LocationManager if you don't have Play Services).
} catch (IOException e) {
    // couldn't configure the gps driver...
}

// Unregister and close the input driver when finished:

mGpsDriver.unregister();
try {
    mGpsDriver.close();
} catch (IOException e) {
    // error closing gps driver
}

License

Copyright 2016 Google Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.