public class MainActivity extends Activity { private Camera mCamera; private CameraPreview mPreview; public static final int MEDIA_TYPE_IMAGE = 1; TextView lblname; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Create an instance of Camera mCamera = getCameraInstance(); // Create our Preview view and set it as the content of our activity. mPreview = new CameraPreview(this, mCamera); FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mPreview); FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); params.gravity = Gravity.CENTER| Gravity.BOTTOM; lblname = new TextView(this); lblname.setText("3 sec"); lblname.setId(5); // id should be unique lblname.setTextSize(55); lblname.setTextColor(Color.WHITE); lblname.setGravity(Gravity.CENTER); preview.addView(lblname,params);// specify your index new CountDownTimer(4000, 1000) { public void onTick(long millisUntilFinished) { lblname.setText("" + millisUntilFinished / 1000); } public void onFinish() { lblname.setText(""); mCamera.takePicture(null, null, mPicture); } }.start(); } /** A safe way to get an instance of the Camera object. */ public static Camera getCameraInstance(){ Camera c = null; int cameraCount = 0; try { // c = Camera.open(); // attempt to get a Camera instance Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras(); System.out.println("cameraCount:"+cameraCount); for (int camIdx = 0; camIdx < cameraCount; camIdx++) { Camera.getCameraInfo(camIdx, cameraInfo); if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { try { c = Camera.open(camIdx); } catch (RuntimeException e) { Log.e("camera", "Camera failed to open: " + e.getLocalizedMessage()); } } } } catch (Exception e){ // Camera is not available (in use or does not exist) System.out.println("camera error:"+e); } return c; // returns null if camera is unavailable } private PictureCallback mPicture = new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE); String TAG = "preview"; if (pictureFile == null){ Log.d(TAG, "Error creating media file, check storage permissions: "); return; } try { FileOutputStream fos = new FileOutputStream(pictureFile); fos.write(data); fos.close(); } catch (FileNotFoundException e) { Log.d(TAG, "File not found: " + e.getMessage()); } catch (IOException e) { Log.d(TAG, "Error accessing file: " + e.getMessage()); } } }; /** Create a File for saving an image or video */ private static File getOutputMediaFile(int type){ // To be safe, you should check that the SDCard is mounted // using Environment.getExternalStorageState() before doing this. File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "MyCameraApp"); // This location works best if you want the created images to be shared // between applications and persist after your app has been uninstalled. // Create the storage directory if it does not exist if (! mediaStorageDir.exists()){ if (! mediaStorageDir.mkdirs()){ Log.d("MyCameraApp", "failed to create directory"); return null; } } // Create a media file name String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); File mediaFile; if (type == MEDIA_TYPE_IMAGE){ mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_"+ timeStamp + ".jpg"); } else { return null; } return mediaFile; } } Camera preview /** A basic Camera preview class */ public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private SurfaceHolder mHolder; private Camera mCamera; private String TAG="camera preview"; public CameraPreview(Context context, Camera camera) { super(context); mCamera = camera; // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. try { mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { Log.d(TAG, "Error setting camera preview: " + e.getMessage()); } } public void surfaceDestroyed(SurfaceHolder holder) { // empty. Take care of releasing the Camera preview in your activity. } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. if (mHolder.getSurface() == null){ // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e){ // ignore: tried to stop a non-existent preview } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e){ Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } }
main.xml <linearlayout android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="horizontal" xmlns:android="http://schemas.android.com/apk/res/android"> <framelayout android:id="@+id/camera_preview" android:layout_height="fill_parent" android:layout_weight="1" android:layout_width="fill_parent"> </framelayout> </linearlayout></div> Androidmanifest.xml <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" android:required="false" /> <uses-feature android:name="android.hardware.camera.front" android:required="false" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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