Android

Used Hardware API

android.hardware : With the help of android.hardware package, we gets support for hardware features, such as the camera and other sensors. but your application requires using the <uses-feature > manifest element because all Android-powered devices not support all hardware features.

Commanly Used class in android.hardware package

1. android.hardware.Camera: This class is used to set image capture settings, start/stop preview, snap pictures, and retrieve frames for encoding for video. if we want to access the device camera, you must declare the CAMERA permission in your Android Manifest file.

<uses-permission android:name="android.permission.CAMERA" />
 <uses-feature android:name="android.hardware.camera" />
 <uses-feature android:name="android.hardware.camera.autofocus" />

2. android.hardware.Camera.CameraInfo: This class have Information about a camera.
3. android.hardware.Sensor class : Sensor Class representing a sensor. WE can get get the list of available Sensors by getSensorList(int).
4. android.hardware.SensorManager : This class is used to access the device's sensors.

Commanly Used interface in android.hardware package :

1. android.hardware.Camera.AutoFocusCallback: This interface is used to notify on completion of camera auto focus.
2. android.hardware.Camera.ErrorCallback: This interface return error notification.
3. android.hardware.Camera.OnZoomChangeListener: This is used for zoom changes during a smooth zoom operation.
4. android.hardware.Camera.ShutterCallback: This interface used to signal the moment of actual image capture.
5. android.hardware.SensorEventListener: This is used for receiving notifications when sensor values have changed.
6. android.hardware.SensorListener: This interface is deprecated. Use SensorEventListener instead.
7. android.hardware.usb : With the help of this package, we provides support to communicate with USB hardware peripherals that are connected to Android-powered devices.

Commanly Used class in android.hardware package :

1. UsbManager: Used to access the state of the USB.
2. UsbDevice : Used for communicate with the hardware peripheral if the Android-powered device is acting as the USB host.
3. UsbAccessory: This class representing a USB accessory, which is an external hardware component that communicates with an android application over USB.