Develop Reference

How to Freeze/Lock android Camera X preview with Flash Light updates on taking picture?

I am implementing Camera X. The issue i am facing is to implement a mechanism to lock/freeze camera preview when picture is captured. Currently i have implement a workaround but it doesn't work well if the flash light is on while capturing. I get a frame from previewView (PreviewView) previewView.getBitmap() as before capturing the image and then display in an captureImage (ImageView). But the the freeze frame not show flash light update. My current code is below
private void capturePhoto() {
showProgress(true);
// Get the Information to be used & stored with Image
ContentValues contentValues = getImageSaveInfo();
Uri externalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
ImageCapture.OutputFileOptions options = new ImageCapture.OutputFileOptions
.Builder(getContentResolver(), externalUri, contentValues)
.build();
// Play the Capture Sound when a picture is captured.
playCameraShutterSound();
// Display current frame From Preview in ImageView.
freezePreview(true);
imageCapture.takePicture(options,
ContextCompat.getMainExecutor(this),
new ImageCapture.OnImageSavedCallback() {
#Override
public void onImageSaved(#NonNull ImageCapture.OutputFileResults results) {
ToastUtility.successToast(getApplicationContext(),
"Photo Capture Successfully");
// Update Last Taken Image View with new Image
getLastTakenImage();
if (results.getSavedUri() != null) {
Log.d(TAG, "Image Saved At -> " + results.getSavedUri().toString());
}
showProgress(false);
freezePreview(false);
}
#Override
public void onError(#NonNull ImageCaptureException exception) {
ToastUtility.errorToast(getApplicationContext(),
"Photo Couldn't Capture");
Log.d(TAG, "Image Capture Error -> " + exception.getMessage());
showProgress(false);
freezePreview(false);
}
});
}
private void freezePreview(boolean value) {
if (value) {
Bitmap bitmap = mainBinding.previewView.getBitmap();
Glide.with(getApplicationContext())
.load(bitmap).into(mainBinding.captureImage);
mainBinding.captureImage.setVisibility(View.VISIBLE);
mainBinding.previewView.setVisibility(View.INVISIBLE);
} else {
mainBinding.previewView.setVisibility(View.VISIBLE);
mainBinding.captureImage.setVisibility(View.INVISIBLE);
}
}

The flash is triggered at some point after takePicture() is called, there isn't a callback for it in CameraX, so there isn't a direct way to know when it's fired.
You can instead use camera2 interop to indirectly check for the flash state. You can add a session CaptureCallback to ImageCapture's config, then inside the callback's onCaptureCompleted, check if the flash state of the total result is FIRED.
// Override onCaptureCompleted to check for the flash state
CameraCaptureSession.CaptureCallback sessionCaptureCallback = //... ;
// Initialize an ImageCapture builder
ImageCapture.Builder configBuilder = new ImageCapture.Builder();
// Add the session CaptureCallback to it
new Camera2Interop.Extender<>(configBuilder)
.setSessionCaptureCallback(sessionCaptureCallback);
// Build the ImageCapture use case
ImageCapture useCase = configBuilder.build();

Attempting to record mic input over Bluetooth

I have an Arduino which broadcasts via Bluetooth, input from a mic.
I want to connect the phone so that it'll record and save the input from the Arduino mic via Bluetooth.
When I run the following code, I have a few issues.
I can't seem to find the file I saved.
File file=new File(mFilePath2,"test.txt");
On Logcat I'm getting the following errors when I run Bluetooth_Test()
ACDB-LOADER - Error: ACDB AudProc vol returned = -19
MediaPlayer - Error (1, -1004)
When I run stop() I get:
MPEG4Writer - Stop() called but track is not started
MediaPlayer-JNI QCMediaPlayer mediaplayer NOT present
MediaPlayer - Should have subtitle controller already set
I'm not sure what is happening and I'm not sure how to figure it out.
References:
Sony - Use Bluetooth for audio I/O
Media Player called in state 0, error (-38,0) (it solved one error, not listed above)
Code:
public void Bluetooth_Test (){
Toast.makeText(getActivity(), "weee", Toast.LENGTH_LONG).show();
maudioManager = (AudioManager) getActivity().getSystemService(getActivity().AUDIO_SERVICE);
// Switch to headset
maudioManager.setMode(AudioManager.MODE_IN_CALL); // to use headset's I/O and not phone's
// Start audio I/O operation (in background)
maudioManager.startBluetoothSco();
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // set source to current mic (should be Bluetooth)
mFilePath = Environment.getExternalStorageDirectory().getAbsolutePath();
String mFilePath2 = mFilePath;
mFilePath += "/youraudiofile.mp3";
File file=new File(mFilePath2,"test.txt");
// Set file extension for the recorded audio file
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// Set a file path for the recorded audio file
mRecorder.setOutputFile(mFilePath);
// Set encoding of the audio
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
}
catch (IOException e){
Log.e("Starting mRecorder", "IO Exception");
}
// Start recording
mRecorder.start();
}
public void stop () {
mRecorder.stop();
mRecorder.reset();
mRecorder.release();
mRecorder = null;
final MediaPlayer mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(mFilePath);
mPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mp) {
mPlayer.start(); // Start playing audio file
}
});
// Audio file to be played
mPlayer.prepareAsync();
} catch (IOException e){
Log.e("Stop Function", "IO Exception");
}
}

MediaRecorder not saving files

I've had a look through the other people's encounters with this problem and have not found an adequate solution.
Like them, I followed the tutorial on camera functionality at: http://developer.android.com/guide/topics/media/camera.html.
Everything listed below works perfectly to the point where I assume that the program has recorded video as I had intended. However, upon reviewing the video in the gallery, it has not appeared. I'm confused as there are no IOExceptions or other bugs present when connected for USB debugging. Strangely, upon removing the USB and plugging it in again, whenever that may be, either immediately or at some point days in the future, all of the previously recorded videos appear in the gallery. Clearly there something I have missed or some aspect of recording video that I am not aware of. Would appreciate any help or guidance, thank you.
Pertinent code is as follows, I'll post more if someone needs it.
Camera Activity:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mCamera = MainActivity.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);
button_capture = (Button) findViewById(R.id.button_capture);
button_capture.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (isRecording) {
// stop recording and release camera
mMediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
button_capture.setText("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
button_capture.setText("Stop");
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
});
}
private boolean prepareVideoRecorder(){
mMediaRecorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
// Step 2: Set sources
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
mMediaRecorder.setOutputFile(MediaCapture.getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
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;
}
Media Capture:
public static Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(MEDIA_TYPE_VIDEO));
}
/**
* Create a File for saving an image or video
*/
public 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_MOVIES), "MyApplication");
// 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("MyApplication", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HH:mm:ss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_" + timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
}

I too was very perplexed by this behaviour until I realised unplugging the USB was causing the files to appear. This appears to be a bug in Android, possibly related to this one :
https://code.google.com/p/android/issues/detail?id=195362
Clearly, the file has been written correctly, but for some reason the new file is not visible. In any case, the solution/workaround offered in the link above is to force a media scan of your file. e.g.
MediaScannerConnection.scanFile(getContext(), new String[]{this.mediaFile.getAbsolutePath()}, null, null);
Where 'mediaFile' is the file your mediaRecorder has just finished writing. With this in place I do not need to unplug the USB cable to see the file and it appears immediately after recording has finished.
I am running Android 5.0.2 on a Samsung Galaxy A5. This feels more of a workaround than a fix and I can't be sure it will work on other devices or Android versions, but I hope it helps someone.

Media Playback of Recorded Audio not able to play on speaker on Android

I am making a Call recorder app in Android. I have a service that detects the incoming and outgoing call and as soon as the service detects the incoming or outgoing call it starts the recording through media player. It is getting recorded sucessfully but I am unable to play it on speaker. The volume is very low even after enabling speakers through Audio Manager. Please let me know where I might be going wrong.
Note: I am guessing that my audio is not getting recorded properly because if I play the recorded file through my phone music player, then even there I am not able to play that file on speaker.
below is my code which is used to start the recording:
try{
MediaRecorder mediaRecorder = new MediaRecorder();
if(AUDIO_SOURCE_TYPE.equalsIgnoreCase("VOICE_COMMUNICATION"))
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION);
}
else if(AUDIO_SOURCE_TYPE.equalsIgnoreCase("VOICE_UPLINK"))
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_UPLINK);
}
else if(AUDIO_SOURCE_TYPE.equalsIgnoreCase("VOICE_DOWNLINK"))
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_DOWNLINK);
}
else if(AUDIO_SOURCE_TYPE.equalsIgnoreCase("MIC"))
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
}
else if(AUDIO_SOURCE_TYPE.equalsIgnoreCase("DEFAULT"))
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
}
else
{
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
}
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setOutputFile(getTempFilename());
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.prepare();
} catch (Exception e) {
e.printStackTrace();
}
mediaRecorder.start();
Below is the Media Playback Code :
final MediaPlayer mp=new MediaPlayer();
String uri= getIntent().getStringExtra("fileURI"); //fetches the string defining the path of file to be played
Uri fileURI = Uri.parse(uri);
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mAudioManager.setSpeakerphoneOn(true);
int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, maxVolume, AudioManager.FLAG_PLAY_SOUND);
try{
try {
mp.setDataSource(getApplicationContext(), fileURI);
} catch (IOException e) {
e.printStackTrace();
}
}
mp.prepare();
}catch(Exception e){e.printStackTrace();}
mp.start();

Trouble with Android Camera

I have some code I have been experimenting with to see what I can do with the camera device. This following code works, but I have some issues with it that I cannot seem to solve.
The first call never works. The first time running the code the onPictureTaken callback is never called, so the file is never written. However the camera goes through all the other steps, including making the fake shutter noise.
I can't seem to set the picture size to something other than whatever it defaults to. If I try to set it to something else, the code stops working. Does the same as above, where the camera goes through all the motions, but the onPictureTaken callback is never called.
When the pictures are saved to the DCIM folder, the taken pictures do not show up in the default 'Photos' app on my phone, unless i reboot the phone.
Is there any way through code to disable the shutter noise?
Sorry, the code is a little messy because its an experiment.
Also, this code is executed in a BroadcastReceiver
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if(intent.getAction().equals(TAKE_PICTURE_INTENT))
{
Toast.makeText(context, "Test", Toast.LENGTH_LONG).show();
System.out.println("GOT THE INTENT");
try
{
Camera camera = Camera.open();
System.out.println("CAMERA OPENED");
Parameters params = camera.getParameters();
params.set("flash-mode", "off");
params.set("focus-mode", "infinity");
params.set("jpeg-quality", "100");
//params.setPictureSize(2592, 1952);
String str = params.get("picture-size" + "-values");
System.out.println(str);
String size = str.split(",")[0];
System.out.println(size);
//params.set("picture-size", size);
camera.setParameters(params);
System.out.println("CAMERA PARAMETERS SET");
camera.startPreview();
System.out.println("CAMERA PREVIEW STARTED");
camera.autoFocus(new AutoFocusCallBackImpl());
}
catch(Exception ex)
{
System.out.println("CAMERA FAIL, SKIP");
return ;
}
}//if
}//onreceive
private void TakePicture(Camera camera)
{
camera.takePicture(new Camera.ShutterCallback() {
#Override
public void onShutter() {
// TODO Auto-generated method stub
System.out.println("CAMERA SHUTTER CALLBACK");
}
}
, null,
new Camera.PictureCallback() {
public void onPictureTaken(byte[] imageData, Camera c) {
//c.release();
System.out.println("CAMERA CALLBACK");
FileOutputStream outStream = null;
try {
System.out.println("Start Callback");
File esd = Environment.getExternalStorageDirectory();
outStream = new FileOutputStream(esd.getAbsolutePath() + String.format(
"/DCIM/%d.jpg", System.currentTimeMillis()));
outStream.write(imageData);
outStream.close();
System.out.println( "onPictureTaken - wrote bytes: " + imageData.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
System.out.println("File not found exception");
} catch (IOException e) {
e.printStackTrace();
System.out.println("IO exception");
} finally {
System.out.println("Finally");
c.release();
}
}
}
);
//camera.release();
}//TAKE PICTURE
private class AutoFocusCallBackImpl implements Camera.AutoFocusCallback {
#Override
public void onAutoFocus(boolean success, Camera camera) {
//bIsAutoFocused = success; //update the flag used in onKeyDown()
System.out.println("Inside autofocus callback. autofocused="+success);
//play the autofocus sound
//MediaPlayer.create(CameraActivity.this, R.raw.auto_focus).start();
if(success)
{
System.out.println("AUTO FOCUS SUCCEDED");
}
else
{
System.out.println("AUTO FOCUS FAILED");
}
TakePicture(camera);
System.out.println("CALLED TAKE PICTURE");
}
}//AUTOFOCUSCALLBACK

1.First of all put all camera logic out of BroadCast receiver & put it into seprate Activity.
2.
When the pictures are saved to the DCIM folder, the taken pictures do not show up in the default 'Photos' app on my phone, unless i reboot the phone.
because MediaScanner needs to be called to rescan images/changes once you take photo. When u reboot phone mediascanner scans media & finds new images. for this isuue you should check out MediaScanner.
3.Follow Android Camera Tutorial & Camera API
-Thanks