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Camera API - Android - PowerPoint PPT Presentation

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Camera API - Android
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  1. Camera API - Android - RohitVobbilisetty

  2. What is the Camera API • Capture Photos • Capture Videos Camera API - Android

  3. Before starting • Declare the permissions in the Android ManifestCamera Usage:<uses-permission android:name="android.permission.CAMERA" />Camera Features:<uses-feature android:name="android.hardware.camera" />Camera Auto-Focus:<uses-feature android:name="android.hardware.camera.autofocus" />Write to External Storage:<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> Camera API - Android

  4. Camera APIOverview Primary API for controlling device cameras. Used to capture pictures and videos. Package: android.hardware.Camera Methods: Camera.open() – Obtain an instance startPreview() – Starts the Camera preview takePicture() – Takes a picture stopPreview() – Stops the Camera preview release() – Releases the camera getParameters() – Zoom, Image Quality, Location Information Camera API - Android

  5. Camera API – Capture Photo • Detect and Access Camera • Create a Preview Class • Build a Preview Layout • Setup Listeners for Capture • Capture and Save Files • Release the Camera Camera API - Android

  6. Camera API – Capture PhotoDetect and Access Camera Check for an existing Camera and obtain reference. Detect if(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera returntrue; } else { // no camera on this device returnfalse; } Access Use camera.open() to obtain a reference to the Camera. An exception implies Camera is in use or does not exist. Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } Use Camera.getParameters() to obtain the Camera capabilities. Camera API - Android

  7. Camera API – Capture PhotoCreate a Preview Class and Preview Layout Surface View (android.view.SurfaceView) • Provides a dedicated surface • Is Z- ordered, so useful for overlaying buttons over this surface SurfaceHolder.Callback (interface)(android.view.SurfaceHolder.Callback) • Receives information about changes to the surface (SurfaceView). • Methods: surfaceCreated()surfaceChanged() surfaceDestroyed() Camera API - Android

  8. Camera API – Capture PhotoCreate a Preview Class and Preview Layout A Preview Class is a SurfaceView that can display live image data coming directly from the Camera. Create a class that extends SurfaceView and implements Surfaceholder.Callback.. Override the methods surfaceCreated(), surfaceChanged() and surfaceDestroyed() Preview Layout: Relative Layout with a Frame Layout to display the Camera Preview, and a Button which will trigger the capture. Camera API - Android

  9. Camera API – Capture PhotoSetup Listeners for Capture Attach an OnClick Listener to the button. This listener should call takePicture().NOTE: The method takePicture() requires the instance of PictureCallback as an argument. Camera API - Android

  10. Camera API – Capture PhotoCapture and Save Files Create an instance of PictureCallback() and override the method onPictureTaken(). This method includes the logic to save the image to a file. Once the picture is taken, the method onPictureTaken() is called. Camera API - Android

  11. Camera API – Capture PhotoRelease the Camera Release the Camera by calling Camera.release(), once the application does not require it or on application exit. Camera API - Android

  12. Camera API – Capture PhotoOrientation and Rotation The Camera Preview’s Orientation depends on the Orientation and Rotation of the device. Orientation (Portrait OR Landscape) getResources().getConfiguration().orientation Rotation activity.getWindowManager().getDefaultDisplay().getRotation(); Returns: ROTATION_0, ROTATION_90, ROTATION_180, ROTATION_270 Set the Camera Preview Orientation using Camera.setDisplayOrientation(angle). Camera API - Android

  13. Camera API – Capture PhotoOrientation and Rotation Orientation: Landscape Rotation: ROTATION_270 Fix: Set the Camera Preview Orientation using Camera.setDisplayOrientation() If(Orientation=Landscape & Rotation=ROTATION_270){ Camera.setDisplayOrientation(180). } Camera API - Android

  14. Camera API – Capture PhotoDiagram Activity new CameraPreview(Camera) Button Event Handler Device Camera Camera Preview surfaceCreated() surfaceChanged() surfaceDestroyed() LayoutFrameLayout and Button Camera API - Android

  15. Additional Features • Zoom (API level 8) • GPS Data • Video Snapshot (API level 14) • Face Detection (API level 14) Camera API - Android

  16. Demo Camera API - Android

  17. References • Android Developer – Camera APIhttp://developer.android.com/guide/topics/media/camera.html • StackOverflow • Vogella.com – Camera APIhttp://www.vogella.com/articles/AndroidCamera/article.html Camera API - Android

  18. Questions ?? Camera API - Android

  19. Thank You Camera API - Android