5
Sto implementando un'applicazione per fotocamera e quando guardo l'anteprima (specialmente con la fotocamera anteriore), l'immagine è molto grossa. Sembra che l'immagine venga allungata orizzontalmente. Seguo l'esempio sdk con le dimensioni della fotocamera ottimizzata ma non aiuta. Come posso regolare le impostazioni della mia fotocamera in modo che sia in anteprima come l'altra app della fotocamera?L'anteprima della fotocamera Android sembra strana
Grazie.
Il mio codice è di sotto.
public class CameraActivity extends Activity implements SurfaceHolder.Callback, Camera.ShutterCallback, Camera.PictureCallback {
Camera m_camera;
SurfaceView m_surfaceView;
int m_numOfCamera;
int m_defaultCameraId;
int m_currentCamera;
int m_surfaceWidth;
int m_surfaceHeight;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
getActionBar().setDisplayHomeAsUpEnabled(true);
m_surfaceView = (SurfaceView)findViewById(R.id.cameraPreview);
m_surfaceView.getHolder().addCallback(this);
m_camera = Camera.open();
m_numOfCamera = Camera.getNumberOfCameras();
CameraInfo cameraInfo = new CameraInfo();
for (int i = 0; i < m_numOfCamera; ++i) {
Camera.getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
m_defaultCameraId = i;
m_currentCamera = m_defaultCameraId;
}
}
if (m_numOfCamera < 1) {
MenuItem switchCam = (MenuItem)findViewById(R.id.menu_switch_camera);
switchCam.setVisible(false);
}
}
@Override
public void onPause() {
super.onPause();
m_camera.stopPreview();
}
@Override
public void onDestroy() {
super.onDestroy();
m_camera.release();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_camera, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(final MenuItem item)
{
if (item.getItemId() == android.R.id.home)
{
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
}
else if (item.getItemId() == R.id.menu_switch_camera)
{
if (m_camera != null) {
m_camera.stopPreview();
m_camera.release();
m_camera = null;
}
m_camera = Camera.open((m_currentCamera + 1) % m_numOfCamera);
m_currentCamera = (m_currentCamera + 1) % m_numOfCamera;
Camera.Parameters params = m_camera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
Camera.Size size = getOptimalPreviewSize(sizes, m_surfaceWidth, m_surfaceHeight);
params.setPreviewSize(size.width, size.height);
m_camera.setParameters(params);
setCameraDisplayOrientation(this, m_currentCamera, m_camera);
m_camera.startPreview();
try {
m_camera.setPreviewDisplay(m_surfaceView.getHolder());
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
return true;
}
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
}
public void onShutter() {
// TODO Auto-generated method stub
}
public void surfaceChanged(SurfaceHolder arg0, int format, int w, int h) {
m_surfaceWidth = w;
m_surfaceHeight = h;
Camera.Parameters params = m_camera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
Camera.Size selected = getOptimalPreviewSize(sizes, w, h);
params.setPreviewSize(selected.width, selected.height);
m_camera.setParameters(params);
setCameraDisplayOrientation(this, m_currentCamera, m_camera);
m_camera.startPreview();
}
private static void setCameraDisplayOrientation(Activity activity,
int cameraId, android.hardware.Camera camera) {
android.hardware.Camera.CameraInfo info =
new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0: degrees = 0; break;
case Surface.ROTATION_90: degrees = 90; break;
case Surface.ROTATION_180: degrees = 180; break;
case Surface.ROTATION_270: degrees = 270; break;
}
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
camera.setDisplayOrientation(result);
}
public void surfaceCreated(SurfaceHolder arg0) {
try {
m_camera.setPreviewDisplay(m_surfaceView.getHolder());
} catch (Exception e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) w/h;
if (sizes == null)
return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
double ratio = (double) size.width/size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
}
Grazie Un sacco! Ci proverò. –
Com'è possibile che la normale fotocamera di qualsiasi dispositivo abbia un'anteprima a tutto schermo, senza alcun allungamento? – idish
L'ho preso all'interno di sdk/sample/adroid-18. Grazie –