Android™ Application Development - Bahar Ali Khan

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Chapter 10: Accessing Android Hardware 320 You can use the set* methods on the returned Parameters to modify the settings. To apply changes, call setParameters, passing in the modifi ed values as shown below: Camera.Parameters parameters = camera.getParameters(); parameters.setPictureFormat(PixelFormat.JPEG); camera.setParameters(parameters); The Camera Parameters can be used to specify the image and preview size, image format, and preview frame rate. Using the Camera Preview Access to the camera’s streaming video means that you can incorporate live video into your applications. Some of the most exciting early Android applications have used this functionality as the basis for augmenting reality. The camera preview can be displayed in real time onto a Surface, as shown in the code snippet below: camera.setPreviewDisplay(mySurface); camera.startPreview(); [ … ] camera.stopPreview(); You’ll learn more about Surfaces in the following chapter, although Android includes an excellent example of using a SurfaceView to display the camera preview in real time. This example is available in the graphics/CameraPreview project in the SDK API demos. You can also assign a PreviewCallback to be fi red for each preview frame, allowing you to manipulate or display each preview frame individually. Call the setPreviewCallback method on the Camera object, passing in a new PreviewCallback implementation overriding the onPreviewFrame method as shown here: camera.setPreviewCallback(new PreviewCallback() { public void onPreviewFrame(byte[] _data, Camera _camera) { // TODO Do something with the preview image. } }); Taking a Picture Take a picture by calling takePicture on a Camera object, passing in a ShutterCallback and PictureCallback implementations for the RAW and JPEG-encoded images. Each picture callback will receive a byte array representing the image in the appropriate format, while the shutter callback is triggered immediately after the shutter is closed. private void takePicture() { camera.takePicture(shutterCallback, rawCallback, jpegCallback); } ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() { // TODO Do something when the shutter closes. } }; Chapter 10: Accessing Android Hardware PictureCallback rawCallback = new PictureCallback() { public void onPictureTaken(byte[] _data, Camera _camera) { // TODO Do something with the image RAW data. } }; PictureCallback jpegCallback = new PictureCallback() { public void onPictureTaken(byte[] _data, Camera _camera) { // TODO Do something with the image JPEG data. } }; Introducing the Sensor Manager The Sensor Manager is used to manage the sensor hardware available on an Android device. Use getSystemService to get a reference to the Sensor Service as shown in the code snippet below: String service_name = Context.SENSOR_SERVICE; SensorManager sensorManager = (SensorManager)getSystemService(service_name); The following sections look closely at how to use the Sensor Manager to monitor orientation and acceleration, but the pattern shown here can be used to monitor sensor results from any available hardware sensor: SensorListener mySensorListener = new SensorListener() { public void onSensorChanged(int sensor, float[] values) { // TODO Deal with sensor value changes } public void onAccuracyChanged(int sensor, int accuracy) { // TODO Auto-generated method stub } }; The SensorListener interface is used to listen for Sensor value and accuracy changes. Implement the onSensorChanged method to react to value changes. The sensor parameter identifi es the sensor that triggered the event, while the values float array contains the new values detected by that sensor. Implement onAccuracyChanged to react to changes in a sensor’s accuracy. The sensor parameter again identifi es the sensor that triggered the event, while the accuracy parameter indicates the new accuracy of that sensor using one of the constants: ❑ SensorManager.SENSOR_STATUS_ACCURACY_HIGH Indicates that the sensor is reporting with the highest possible accuracy. ❑ SensorManager.SENSOR_STATUS_ACCURACY_LOW Indicates that the sensor is reporting with low accuracy and needs to be calibrated. 321
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} Chapter 6: Data Storage, Retrieva
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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