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professional android application development phần 9

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thế nào để sử dụng một số của các nhà cung cấp nội dung hữu ích và mạnh mẽ hơn bản địaSử dụng các nhà cung cấp hàng MediaCác Android Media Store cung cấp một kho lưu trữ quản lý âm thanh, video, và các tập tin hình ảnh. Bất cứ khi nào bạn thêm một tập tin đa phương tiện mới | Chapter 10 Accessing Android Hardware SensorManager.SENSOR_STATUS_ACCURACY_MEDIUM Indicates that the sensor data is of average accuracy and that calibration might improve the readings. SensorManager.SENSOR_STATUS_UNRELIABLE Indicates that the sensor data is unreliable meaning that either calibration is required or readings are not currently possible. The Sensor Manager includes constants to help identify the sensor triggering the change event. The following list includes the sensors for which constants are currently defined. Some or all of these sensors will be available to your applications depending on the hardware available on the host device SensorManager.SENSOR_ACCELEROMETER Is an accelerometer sensor that returns the current acceleration along three axes in meters per second squared m s2 . The accelerometer is explored in greater detail later in this chapter. SensorManager.SENSOR_ORIENTATION Is an orientation sensor that returns the current orientation on three axes in degrees. The orientation sensor is explored in greater detail later in this chapter. SensorManager.SENSOR_LIGHT Is an ambient-light sensor that returns a single value describing the ambient illumination in lux. SensorManager.SENSOR_MAGNETIC_FIELD Is a sensor used to determine the current magnetic field measured in microteslas pT along three axes. SensorManager.SENSOR_PROXIMITY Is a proximity sensor that returns a single value describing the distance between the device and the target object in meters m . SensorManager.SENSOR_TEMPERATURE Is a thermometer sensor that returns the ambient temperature in degrees Celsius C . To receive notifications of changes from a particular sensor create a Sensor Listener as described previously and register it with the Sensor Manager specifying the sensor that should trigger the Listener and the rate at which the sensor should update as shown in the following code snippet sensorManager.registerListener mySensorListener SensorManager.SENSOR_TRICORDER .