L'esempio sopra funzionerà se si utilizza la fotocamera posteriore. Se si utilizza la fotocamera anteriore, è necessario regolare alcune cose:
Prima di tutto, dovrai aggiungere una nuova autorizzazione nel manifest.
<uses-feature android:name="android.hardware.camera.front" android:required="false" />
Nel tuo initRecordermetodo, invece di
CamcorderProfile cpHigh = CamcorderProfile
.get(CamcorderProfile.QUALITY_HIGH);
recorder.setProfile(cpHigh);
Devi usare:
CamcorderProfile profile = CamcorderProfile.get(Camera.CameraInfo.CAMERA_FACING_FRONT, CamcorderProfile.QUALITY_LOW);
recorder.setProfile(profile);
perché CamcorderProfile.QUALITY_HIGHè riservato per la fotocamera posteriore.
Dovrai anche impostare le dimensioni del video per il registratore multimediale come nella vista della superficie.
Ecco l'esempio completo di registrazione di video dalla fotocamera frontale con un piccolo display di anteprima:
Android.manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<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" />
activity_camera.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="CameraActivity">
<SurfaceView
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/surfaceView"/>
<Button
android:layout_width="100dp"
android:layout_height="100dp"
android:text="REC"
android:id="@+id/btnRecord"
android:layout_alignParentBottom="true"
android:layout_marginBottom="25dp" />
</RelativeLayout>
CameraActivity.java
public class SongVideoActivity extends BaseActivity implements SurfaceHolder.Callback {
private int mCameraContainerWidth = 0;
private SurfaceView mSurfaceView = null;
private SurfaceHolder mSurfaceHolder = null;
private Camera mCamera = null;
private boolean mIsRecording = false;
private int mPreviewHeight;
private int mPreviewWidth;
MediaRecorder mRecorder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_song_video);
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread thread, Throwable ex) {
releaseMediaRecorder();
releaseCamera();
}
});
mCamera = getCamera();
//camera preview
mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mCameraContainerWidth = mSurfaceView.getLayoutParams().width;
findViewById(R.id.btnRecord).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mIsRecording) {
stopRecording();
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
mRecorder.start();
// inform the user that recording has started
Toast.makeText(getApplicationContext(), "Started recording", Toast.LENGTH_SHORT).show();
mIsRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
});
}
private void stopRecording() {
mRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
Toast.makeText(this, "Recording complete", Toast.LENGTH_SHORT).show();
mIsRecording = false;
}
@Override
protected void onDestroy() {
super.onDestroy();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private Camera getCamera() {
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
return mCamera = Camera.open(camIdx);
} catch (RuntimeException e) {
Log.e("cameras", "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return null;
}
@Override
protected void onPause() {
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private Camera.Size getBestPreviewSize(Camera.Parameters parameters) {
Camera.Size result=null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if(size.width < size.height) continue; //we are only interested in landscape variants
if (result == null) {
result = size;
}
else {
int resultArea = result.width*result.height;
int newArea = size.width*size.height;
if (newArea > resultArea) {
result = size;
}
}
}
return(result);
}
private boolean prepareVideoRecorder(){
mRecorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
mRecorder.setCamera(mCamera);
// Step 2: Set sources
mRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
//recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
// Customise your profile based on a pre-existing profile
CamcorderProfile profile = CamcorderProfile.get(Camera.CameraInfo.CAMERA_FACING_FRONT, CamcorderProfile.QUALITY_LOW);
mRecorder.setProfile(profile);
// Step 4: Set output file
mRecorder.setOutputFile(new File(getFilesDir(), "movie-" + UUID.randomUUID().toString()).getAbsolutePath());
//recorder.setMaxDuration(50000); // 50 seconds
//recorder.setMaxFileSize(500000000); // Approximately 500 megabytes
mRecorder.setVideoSize(mPreviewWidth, mPreviewHeight);
// Step 5: Set the preview output
mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
// Step 6: Prepare configured MediaRecorder
try {
mRecorder.prepare();
} catch (IllegalStateException e) {
Toast.makeText(getApplicationContext(), "exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
releaseMediaRecorder();
return false;
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
releaseMediaRecorder();
return false;
}
return true;
}
private void releaseMediaRecorder(){
if (mRecorder != null) {
mRecorder.reset(); // clear recorder configuration
mRecorder.release(); // release the recorder object
mRecorder = null;
mCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setRecordingHint(true);
Camera.Size size = getBestPreviewSize(parameters);
mCamera.setParameters(parameters);
//resize the view to the specified surface view width in layout
int newHeight = size.height / (size.width / mCameraContainerWidth);
mSurfaceView.getLayoutParams().height = newHeight;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
mPreviewHeight = mCamera.getParameters().getPreviewSize().height;
mPreviewWidth = mCamera.getParameters().getPreviewSize().width;
mCamera.stopPreview();
try {
mCamera.setPreviewDisplay(mSurfaceHolder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mIsRecording) {
stopRecording();
}
releaseMediaRecorder();
releaseCamera();
}
}