Open the default camera on SurfaceView and record the front camera

Question

I wrote this code to open the front camera on the surface, on the screen, but when you press the button, I want to record video with the front camera.

This code failure. I used two different variables for the cameras, but I did not find my mistake :( .. I followed the Google manual.

public class MainActivity extends Activity { public static final int MEDIA_TYPE_VIDEO = 2; private Camera mCamera; private CameraPreview mPreview; public static final int MEDIA_TYPE_IMAGE = 1; protected static final String TAG = null; private MediaRecorder mMediaRecorder; private Camera mCamerafront; private boolean isRecording = false; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Button captureButton = (Button) findViewById(id.button_capture); 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); // Add a listener to the Capture button Button captureButton = (Button) findViewById(id.button_capture); captureButton.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { if (isRecording) { // stop recording and release camera mMediaRecorder.stop(); // stop the recording releaseMediaRecorder(); // release the MediaRecorder object mCamerafront.lock(); // take camera access back from MediaRecorder // inform the user that recording has stopped //setCaptureButtonText("Capture"); isRecording = false; } else { // initialize video camera if (prepareVideoRecorder()) { // Camera is available and unlocked, MediaRecorder is prepared, // now you can start recording mMediaRecorder.start(); // inform the user that recording has started //setCaptureButtonText("Stop"); isRecording = true; } else { // prepare didn't work, release the camera releaseMediaRecorder(); // inform user } } } } ); /* captureButton.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { // get an image from the camera mCamera.takePicture(null, null, mPicture); } } );*/ } //*PARTE registrazione private boolean prepareVideoRecorder(){ int cameraCount = Camera.getNumberOfCameras()-1; mCamerafront=Camera.open(cameraCount); mMediaRecorder = new MediaRecorder(); mCamerafront.unlock(); mMediaRecorder.setCamera(mCamerafront); mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH)); mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString()); try { mMediaRecorder.prepare(); } catch (IllegalStateException e) { Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage()); // releaseMediaRecorder(); return false; } catch (IOException e) { Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage()); //releaseMediaRecorder(); return false; } return true; } private void releaseMediaRecorder(){ if (mMediaRecorder != null) { mMediaRecorder.reset(); // clear recorder configuration mMediaRecorder.release(); // release the recorder object mMediaRecorder = null; mCamerafront.lock(); // lock camera for later use } } /** Check if this device has a camera */ private boolean checkCameraHardware(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera return true; } else { // no camera on this device return false; } } /** A safe way to get an instance of the Camera object. */ public static Camera getCameraInstance(){ 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) } return c; // returns null if camera is unavailable } /** A basic Camera preview class */ public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private final String TAG = null; private SurfaceHolder mHolder; private Camera mCamera; 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()); } } } @Override protected void onPause() { super.onPause(); // if you are using MediaRecorder, release it first releaseCamera(); // release the camera immediately on pause event } private void releaseCamera(){ if (mCamera != null){ mCamera.release(); // release the camera for other applications mCamera = null; } } private PictureCallback mPicture = new PictureCallback() { public void onPictureTaken(byte[] data, Camera camera) { File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE); 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()); } } }; private static Uri getOutputMediaFileUri(int type){ return Uri.fromFile(getOutputMediaFile(type)); } /** 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.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES), "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 if(type == MEDIA_TYPE_VIDEO) { mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_"+ timeStamp + ".mp4"); } else { return null; } return mediaFile; } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } 

Answer 1

You need to add the following permissions to the AndroidManifest.xml file:

 <uses-permission android:name="android.permission.RECORD_AUDIO" />