在某些设备中，图像会被拉伸(stretch)，我在 5 月份的相机预览中使用 surfaceView。
public class vp02ImageCapture extends SuperVP {
private static final String TAG = "vp02ImageCapture";
private Camera camera;
@Bind(R.id.TransparentView) SurfaceView transparentView;
@Bind(R.id.sv_camera) SurfaceView sv;
@Bind(R.id.relative) RelativeLayout rl;
@Bind(R.id.mask) FrameLayout mask;
private ProgressDialog dp;
private boolean front = true;
private SurfaceHolder sh,holderTransparent;
int orient = 1;
private Handler h = new Handler();
View v;
//private UserInfo info;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
v = inflater.inflate(R.layout.vp02imagecapture, null);
ButterKnife.bind(this, v);
sh = sv.getHolder();
holderTransparent = transparentView.getHolder();
holderTransparent.setFormat(PixelFormat.TRANSPARENT);
transparentView.setZOrderMediaOverlay(true);
return v;
}
public int getscrOrientation()
{
Display getOrient = getActivity().getWindowManager().getDefaultDisplay();
int orientation = getOrient.getOrientation();
// Sometimes you may get undefined orientation Value is 0
// simple logic solves the problem compare the screen
// X,Y Co-ordinates and determine the Orientation in such cases
if(orientation==Configuration.ORIENTATION_UNDEFINED){
Configuration config = getResources().getConfiguration();
orientation = config.orientation;
if(orientation== Configuration.ORIENTATION_UNDEFINED){
//if height and widht of screen are equal then
// it is square orientation
if(getOrient.getWidth()==getOrient.getHeight()){
orientation = Configuration.ORIENTATION_SQUARE;
}else{ //if widht is less than height than it is portrait
if(getOrient.getWidth() < getOrient.getHeight()){
orientation = Configuration.ORIENTATION_PORTRAIT;
}else{ // if it is not any of the above it will defineitly be landscape
orientation = Configuration.ORIENTATION_LANDSCAPE;
}
}
}
}
return orientation; // return value 1 is portrait and 2 is Landscape Mode
}
openCamera()方法
private void openCamera() {
int cameraId;
if (front) {
cameraId = Camera.CameraInfo.CAMERA_FACING_FRONT;
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
} else{
cameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, info);
int rotation = getActivity().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);
final Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();
Camera.Size optimalSize = getOptimalPreviewSize(sizes, getResources().getDisplayMetrics().widthPixels, getResources().getDisplayMetrics().heightPixels);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
transparentView.requestLayout();
sv.requestLayout();
h.postDelayed(new Runnable() {
@Override
public void run() {
try {
Draw();
// camera.setParameters(parameters);
camera.setPreviewDisplay(sh);
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
}, 200);
}
@Override
public void releaseUI() {
rl.setVisibility(View.GONE);
// hideProgressDialog();
camera.release();
}
@Override
public void updateUI() {
super.updateUI();
Log.e("sample","asd " + TAG);
if (TAG.equals("vp02ImageCapture")){
parent.btnNext.setVisibility(View.GONE);
parent.btnBack.setVisibility(View.GONE);
}else{
parent.btnNext.setVisibility(View.VISIBLE);
parent.btnBack.setVisibility(View.VISIBLE);
}
getActivity().setTitle("Image Capture");
rl.setVisibility(View.VISIBLE);
openCamera();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("isfront", front);
}
@OnClick(R.id.btnSwitch)void switchCamera(){
camera.stopPreview();
camera.release();
front = front ? false : true;
openCamera();
}
@OnClick(R.id.btnCapture) void capture(){
// showProgressDialog("Loading...");
camera.takePicture(new Camera.ShutterCallback() {
@Override
public void onShutter() {
}
}, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
}
}, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// rotate capture image
Display display = getActivity().getWindowManager().getDefaultDisplay();
int rotation = 0;
switch (display.getRotation()) {
case Surface.ROTATION_0: // This is display orientation
rotation = 90;
break;
case Surface.ROTATION_90:
rotation = 0;
break;
case Surface.ROTATION_180:
rotation = 270;
break;
case Surface.ROTATION_270:
rotation = 180;
break;
}
//Crop image size
Bitmap bitmap = ImageFactory.byteArrayToBitmap(data);
if (front) {
bitmap = rotate(bitmap, rotation);
}
int l = sv.getWidth() / 8;
int t = (sv.getHeight() / 2) - (l*4);
// 2.3 Size of rotated bitmap
int bitWidth = bitmap.getWidth();
int bitHeight = bitmap.getHeight();
Log.e("SIZES", "" + sv.getHeight() + "----" + bitHeight + "-----");
// 3. Size of camera preview on screen
int preWidth = sv.getWidth();
int preHeight = sv.getHeight();
// 4. Scale it.
// Assume you draw Rect as "canvas.drawRect(60, 50, 210, 297, paint);" command
// canvas.drawRect(l,t,l*7,t + l*8,paint1);
// int startx = (l * bitWidth / preWidth);
// int starty = (t * bitHeight / preHeight);
// int endx = ((l * 6) * bitWidth / preWidth);
// int endy = (((t * 4) * bitHeight / preHeight));
int startx = (l * bitWidth / preWidth);
int starty = (t * bitHeight / preHeight);
int endx = ((l * 6) * bitWidth / preWidth);
int endy = (((t + (l*7)) * bitHeight / preHeight));
Log.e("ELIBOY!", "" + l + "----" + t + "------" + l * 7 + "----" + t * 5);
Log.e("ELI!!!!", "" + startx + "----" + starty + "------" + endx + "----" + endy);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
setImageByteArray(byteArray);
setStartX(startx);
setStartY(starty);
setEndX(endx);
setEndY(endy);
viewPager.setCurrentItem(viewPager.getCurrentItem() + 1); //set next page to display ; current page + 1
/*Fragment f = new vp03ImagePreview();
f.setArguments(b);
getParentFragment().getChildFragmentManager().beginTransaction().replace(R.id.imagefrag_container,f).commit();*/
//ScreenManager.getInstance().replaceScreen(Screens.Enroll02b,b);
}
});
}
boolean fromPause = false;
@Override
public void onResume() {
super.onResume();
if(fromPause)
if(((ScreenTransaction)getParentFragment()).viewPager.getCurrentItem()==1)
openCamera();
fromPause = false;
}
@Override
public void onPause() {
super.onPause();
try{
camera.release();
}catch (NullPointerException e){
}
h.removeCallbacksAndMessages(null);
fromPause = true;
//viewPager.removeOnPageChangeListener(viewpagerChangeListener);
}
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.5;
double targetRatio=(double)h / w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.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);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
@OnClick(R.id.mask)void autofocus(){
camera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
}
});
}
public void showProgressDialog(String message){
dp = new ProgressDialog(getActivity());
dp.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dp.setCancelable(false);
dp.setMessage(message);
dp.show();
}
public void hideProgressDialog(){
dp.hide();
}
}
我想支持全屏。 我该如何解决这个问题？ 在某些屏幕上它可以工作，但在某些情况下特别是当它的默认相机不是全屏时。
最佳答案
我已经编写了这段代码并且它运行得很好。
public class CameraActivity extends Activity implements Constants.Parameters {
FrameLayout previewFrameLayout;
ImageButton captureButton, switchCamera, flashImageButton, backImageButton;
boolean isFlashEnabled = false, isFlashAvailable = false, isFrontCamera = false;
Handler handler;
private int mCameraId;
private Camera mCamera;
private CameraPreview mCameraPreview;
public final int BACK_CAMERA = 0;
public final int FRONT_CAMERA = 1;
String className = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
handler = new Handler();
isFlashAvailable = getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
isFrontCamera = getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT);
previewFrameLayout = (FrameLayout) findViewById(R.id.camera_preview);
captureButton = (ImageButton) findViewById(R.id.button_capture);
captureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(null, null, mPicture);
}
});
switchCamera = (ImageButton) findViewById(R.id.switchCamera);
switchCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Utils.scaleView(switchCamera);
handler.postDelayed(new Runnable() {
@Override
public void run() {
previewFrameLayout.removeAllViews();
if (mCameraId == BACK_CAMERA) {
flashImageButton.setVisibility(View.INVISIBLE);
mCameraId = FRONT_CAMERA;
mCameraPreview = new CameraPreview(CameraNewActivity.this, FRONT_CAMERA);
previewFrameLayout.addView(mCameraPreview);
} else {
flashImageButton.setVisibility(View.VISIBLE);
mCameraId = BACK_CAMERA;
mCameraPreview = new CameraPreview(CameraNewActivity.this, BACK_CAMERA);
previewFrameLayout.addView(mCameraPreview);
}
}
}, 250);
}
});
flashImageButton = (ImageButton) findViewById(R.id.flash);
flashImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Utils.scaleView(flashImageButton);
try {
Camera.Parameters parameters = mCamera.getParameters();
if (!isFlashEnabled) {
isFlashEnabled = true;
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
flashImageButton.setSelected(true);
} else {
isFlashEnabled = false;
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
flashImageButton.setSelected(false);
}
mCamera.setParameters(parameters);
} catch (Exception e) {
e.printStackTrace();
}
}
});
if (!isFlashAvailable) {
flashImageButton.setVisibility(View.GONE);
}
if (!isFrontCamera) {
switchCamera.setVisibility(View.GONE);
}
backImageButton = (ImageButton) findViewById(R.id.back);
backImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
private void hideIcons() {
switchCamera.setVisibility(View.GONE);
captureButton.setVisibility(View.GONE);
flashImageButton.setVisibility(View.GONE);
backImageButton.setVisibility(View.GONE);
}
private void showIcons() {
switchCamera.setVisibility(View.VISIBLE);
captureButton.setVisibility(View.VISIBLE);
flashImageButton.setVisibility(View.VISIBLE);
backImageButton.setVisibility(View.VISIBLE);
}
@Override
protected void onResume() {
super.onResume();
mCameraPreview = new CameraPreview(this, mCameraId);
previewFrameLayout.addView(mCameraPreview);
}
@Override
protected void onPause() {
super.onPause();
mCameraPreview.stop();
previewFrameLayout.removeView(mCameraPreview); // This is necessary.
mCameraPreview = null;
}
Camera.PictureCallback mPicture = new Camera.PictureCallback() {
@Override
public void onPictureTaken(final byte[] data, Camera camera) {
final File pictureFile = new File(Utils.profilePicPath + String.valueOf(System.currentTimeMillis()) + ".jpg");
pictureFile.getParentFile().mkdirs();
Utils.deleteCapture();
if (pictureFile == null) {
return;
}
Thread thread = new Thread() {
@Override
public void run() {
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(pictureFile.getPath(), bmOptions);
final int height = bmOptions.outHeight;
final int width = bmOptions.outWidth;
if (height > width) {
if (height / width < 1.5) {
Bitmap bitmap = Picasso.with(CameraNewActivity.this)
.load(pictureFile).resize((int) (height / 1.65), height).centerCrop().get();
if (mCameraId == FRONT_CAMERA) {
bitmap = flip(bitmap);
}
FileOutputStream out = new FileOutputStream(pictureFile.getPath());
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
};
thread.start();
}
};
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
protected List<Camera.Size> mPreviewSizeList;
protected List<Camera.Size> mPictureSizeList;
protected Camera.Size mPreviewSize;
protected Camera.Size mPictureSize;
private int mSurfaceChangedCallDepth = 0;
private int mCenterPosX = -1;
private int mCenterPosY = 0;
protected boolean mSurfaceChanged = false;
public CameraPreview(Activity activity, int cameraId) {
super(activity);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
if (Camera.getNumberOfCameras() > cameraId) {
mCameraId = cameraId;
} else {
mCameraId = 0;
}
mCamera = Camera.open(mCameraId);
Camera.Parameters cameraParams = mCamera.getParameters();
mPreviewSizeList = cameraParams.getSupportedPreviewSizes();
mPictureSizeList = cameraParams.getSupportedPictureSizes();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
mCamera.release();
mCamera = null;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
mSurfaceChangedCallDepth++;
mCamera.stopPreview();
Camera.Parameters cameraParams = mCamera.getParameters();
if (!mSurfaceChanged) {
Camera.Size previewSize = determinePreviewSize(width, height);
Camera.Size pictureSize = determinePictureSize(previewSize);
mPreviewSize = previewSize;
mPictureSize = pictureSize;
mSurfaceChanged = adjustSurfaceLayoutSize(previewSize, width, height);
if (mSurfaceChanged && (mSurfaceChangedCallDepth <= 1)) {
return;
}
}
if (mCameraId == BACK_CAMERA) {
cameraParams.setRotation(90);
} else {
cameraParams.setRotation(270);
}
mCamera.setDisplayOrientation(90);
cameraParams.set("orientation", "portrait");
cameraParams.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
cameraParams.setPictureSize(mPictureSize.width, mPictureSize.height);
mCamera.setParameters(cameraParams);
mSurfaceChanged = false;
try {
mCamera.startPreview();
} catch (Exception e) {
// Remove failed size
mPreviewSizeList.remove(mPreviewSize);
mPreviewSize = null;
// Reconfigure
if (mPreviewSizeList.size() > 0) { // prevent infinite loop
surfaceChanged(null, 0, width, height);
} else {
Utils.showToast(CameraNewActivity.this, "Can't start preview", Toast.LENGTH_LONG);
}
}
mSurfaceChangedCallDepth--;
}
protected Camera.Size determinePreviewSize(int reqWidth, int reqHeight) {
int reqPreviewWidth = reqHeight; // requested width in terms of camera hardware
int reqPreviewHeight = reqWidth; // requested height in terms of camera hardware
// Adjust surface size with the closest aspect-ratio
float reqRatio = ((float) reqPreviewWidth) / reqPreviewHeight;
float curRatio, deltaRatio;
float deltaRatioMin = Float.MAX_VALUE;
Camera.Size retSize = null;
for (Camera.Size size : mPreviewSizeList) {
curRatio = ((float) size.width) / size.height;
deltaRatio = Math.abs(reqRatio - curRatio);
if (deltaRatio < deltaRatioMin) {
deltaRatioMin = deltaRatio;
retSize = size;
}
}
return retSize;
}
protected Camera.Size determinePictureSize(Camera.Size previewSize) {
Camera.Size retSize = null;
for (Camera.Size size : mPictureSizeList) {
if (size.equals(previewSize)) {
return size;
}
}
// if the preview size is not supported as a picture size
float reqRatio = ((float) previewSize.width) / previewSize.height;
float curRatio, deltaRatio;
float deltaRatioMin = Float.MAX_VALUE;
for (Camera.Size size : mPictureSizeList) {
curRatio = ((float) size.width) / size.height;
deltaRatio = Math.abs(reqRatio - curRatio);
if (deltaRatio < deltaRatioMin) {
deltaRatioMin = deltaRatio;
retSize = size;
}
}
return retSize;
}
protected boolean adjustSurfaceLayoutSize(Camera.Size previewSize,
int availableWidth, int availableHeight) {
float tmpLayoutHeight = previewSize.width;
float tmpLayoutWidth = previewSize.height;
float factH, factW, fact;
factH = availableHeight / tmpLayoutHeight;
factW = availableWidth / tmpLayoutWidth;
if (factH < factW) {
fact = factH;
} else {
fact = factW;
}
FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) this.getLayoutParams();
int layoutHeight = (int) (tmpLayoutHeight * fact);
int layoutWidth = (int) (tmpLayoutWidth * fact);
boolean layoutChanged;
if ((layoutWidth != this.getWidth()) || (layoutHeight != this.getHeight())) {
layoutParams.height = layoutHeight;
layoutParams.width = layoutWidth;
if (mCenterPosX >= 0) {
layoutParams.topMargin = mCenterPosY - (layoutHeight / 2);
layoutParams.leftMargin = mCenterPosX - (layoutWidth / 2);
}
this.setLayoutParams(layoutParams); // this will trigger another surfaceChanged invocation.
layoutChanged = true;
} else {
layoutChanged = false;
}
return layoutChanged;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
stop();
}
public void stop() {
if (mCamera != null) {
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
}
public Bitmap flip(Bitmap bitmap) {
Matrix mtx = new Matrix();
mtx.preScale(-1, 1);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), mtx, true);
}
}
关于android - 使用 SurfaceView 在自定义相机中拉伸(stretch)图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39524494/