Using Androids Optional Hardware APIs 407

Interacting with Device Hardware 407 Using the Device Sensor 408

Working with Different Sensors 408 Acquiring Access to a Sensor 409 Reading Sensor Data 409 Calibrating Sensors 410 Determining Device Orientation 411 Finding True North 412 Working with Wi-Fi 412 Working with Bluetooth 414

Checking for the Existence of Bluetooth Hardware 415 Enabling Bluetooth 415 Querying for Paired Devices 416 Discovering Devices 416 Establishing Connections Between Devices 416 Monitoring the Battery 417 Summary 420

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