| /* |
| * Copyright 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.camera2basic; |
| |
| import android.Manifest; |
| import android.app.Activity; |
| import android.app.AlertDialog; |
| import android.app.Dialog; |
| import android.app.DialogFragment; |
| import android.app.Fragment; |
| import android.content.Context; |
| import android.content.DialogInterface; |
| import android.content.pm.PackageManager; |
| import android.content.res.Configuration; |
| import android.graphics.ImageFormat; |
| import android.graphics.Matrix; |
| import android.graphics.Point; |
| import android.graphics.RectF; |
| import android.graphics.SurfaceTexture; |
| import android.hardware.camera2.CameraAccessException; |
| import android.hardware.camera2.CameraCaptureSession; |
| import android.hardware.camera2.CameraCharacteristics; |
| import android.hardware.camera2.CameraDevice; |
| import android.hardware.camera2.CameraManager; |
| import android.hardware.camera2.CameraMetadata; |
| import android.hardware.camera2.CaptureRequest; |
| import android.hardware.camera2.CaptureResult; |
| import android.hardware.camera2.TotalCaptureResult; |
| import android.hardware.camera2.params.StreamConfigurationMap; |
| import android.media.Image; |
| import android.media.ImageReader; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.support.annotation.NonNull; |
| import android.support.v13.app.FragmentCompat; |
| import android.support.v4.content.ContextCompat; |
| import android.util.Log; |
| import android.util.Size; |
| import android.util.SparseIntArray; |
| import android.view.LayoutInflater; |
| import android.view.Surface; |
| import android.view.TextureView; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.Toast; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| |
| public class Camera2BasicFragment extends Fragment |
| implements View.OnClickListener, FragmentCompat.OnRequestPermissionsResultCallback { |
| |
| /** |
| * Conversion from screen rotation to JPEG orientation. |
| */ |
| private static final SparseIntArray ORIENTATIONS = new SparseIntArray(); |
| private static final int REQUEST_CAMERA_PERMISSION = 1; |
| private static final String FRAGMENT_DIALOG = "dialog"; |
| |
| static { |
| ORIENTATIONS.append(Surface.ROTATION_0, 90); |
| ORIENTATIONS.append(Surface.ROTATION_90, 0); |
| ORIENTATIONS.append(Surface.ROTATION_180, 270); |
| ORIENTATIONS.append(Surface.ROTATION_270, 180); |
| } |
| |
| /** |
| * Tag for the {@link Log}. |
| */ |
| private static final String TAG = "Camera2BasicFragment"; |
| |
| /** |
| * Camera state: Showing camera preview. |
| */ |
| private static final int STATE_PREVIEW = 0; |
| |
| /** |
| * Camera state: Waiting for the focus to be locked. |
| */ |
| private static final int STATE_WAITING_LOCK = 1; |
| |
| /** |
| * Camera state: Waiting for the exposure to be precapture state. |
| */ |
| private static final int STATE_WAITING_PRECAPTURE = 2; |
| |
| /** |
| * Camera state: Waiting for the exposure state to be something other than precapture. |
| */ |
| private static final int STATE_WAITING_NON_PRECAPTURE = 3; |
| |
| /** |
| * Camera state: Picture was taken. |
| */ |
| private static final int STATE_PICTURE_TAKEN = 4; |
| |
| /** |
| * Max preview width that is guaranteed by Camera2 API |
| */ |
| private static final int MAX_PREVIEW_WIDTH = 1920; |
| |
| /** |
| * Max preview height that is guaranteed by Camera2 API |
| */ |
| private static final int MAX_PREVIEW_HEIGHT = 1080; |
| |
| /** |
| * {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a |
| * {@link TextureView}. |
| */ |
| private final TextureView.SurfaceTextureListener mSurfaceTextureListener |
| = new TextureView.SurfaceTextureListener() { |
| |
| @Override |
| public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) { |
| openCamera(width, height); |
| } |
| |
| @Override |
| public void onSurfaceTextureSizeChanged(SurfaceTexture texture, int width, int height) { |
| configureTransform(width, height); |
| } |
| |
| @Override |
| public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) { |
| return true; |
| } |
| |
| @Override |
| public void onSurfaceTextureUpdated(SurfaceTexture texture) { |
| } |
| |
| }; |
| |
| /** |
| * ID of the current {@link CameraDevice}. |
| */ |
| private String mCameraId; |
| |
| /** |
| * An {@link AutoFitTextureView} for camera preview. |
| */ |
| private AutoFitTextureView mTextureView; |
| |
| /** |
| * A {@link CameraCaptureSession } for camera preview. |
| */ |
| private CameraCaptureSession mCaptureSession; |
| |
| /** |
| * A reference to the opened {@link CameraDevice}. |
| */ |
| private CameraDevice mCameraDevice; |
| |
| /** |
| * The {@link android.util.Size} of camera preview. |
| */ |
| private Size mPreviewSize; |
| |
| /** |
| * {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state. |
| */ |
| private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() { |
| |
| @Override |
| public void onOpened(@NonNull CameraDevice cameraDevice) { |
| // This method is called when the camera is opened. We start camera preview here. |
| mCameraOpenCloseLock.release(); |
| mCameraDevice = cameraDevice; |
| createCameraPreviewSession(); |
| } |
| |
| @Override |
| public void onDisconnected(@NonNull CameraDevice cameraDevice) { |
| mCameraOpenCloseLock.release(); |
| cameraDevice.close(); |
| mCameraDevice = null; |
| } |
| |
| @Override |
| public void onError(@NonNull CameraDevice cameraDevice, int error) { |
| mCameraOpenCloseLock.release(); |
| cameraDevice.close(); |
| mCameraDevice = null; |
| Activity activity = getActivity(); |
| if (null != activity) { |
| activity.finish(); |
| } |
| } |
| |
| }; |
| |
| /** |
| * An additional thread for running tasks that shouldn't block the UI. |
| */ |
| private HandlerThread mBackgroundThread; |
| |
| /** |
| * A {@link Handler} for running tasks in the background. |
| */ |
| private Handler mBackgroundHandler; |
| |
| /** |
| * An {@link ImageReader} that handles still image capture. |
| */ |
| private ImageReader mImageReader; |
| |
| /** |
| * This is the output file for our picture. |
| */ |
| private File mFile; |
| |
| /** |
| * This a callback object for the {@link ImageReader}. "onImageAvailable" will be called when a |
| * still image is ready to be saved. |
| */ |
| private final ImageReader.OnImageAvailableListener mOnImageAvailableListener |
| = new ImageReader.OnImageAvailableListener() { |
| |
| @Override |
| public void onImageAvailable(ImageReader reader) { |
| mBackgroundHandler.post(new ImageSaver(reader.acquireNextImage(), mFile)); |
| } |
| |
| }; |
| |
| /** |
| * {@link CaptureRequest.Builder} for the camera preview |
| */ |
| private CaptureRequest.Builder mPreviewRequestBuilder; |
| |
| /** |
| * {@link CaptureRequest} generated by {@link #mPreviewRequestBuilder} |
| */ |
| private CaptureRequest mPreviewRequest; |
| |
| /** |
| * The current state of camera state for taking pictures. |
| * |
| * @see #mCaptureCallback |
| */ |
| private int mState = STATE_PREVIEW; |
| |
| /** |
| * A {@link Semaphore} to prevent the app from exiting before closing the camera. |
| */ |
| private Semaphore mCameraOpenCloseLock = new Semaphore(1); |
| |
| /** |
| * Whether the current camera device supports Flash or not. |
| */ |
| private boolean mFlashSupported; |
| |
| /** |
| * A {@link CameraCaptureSession.CaptureCallback} that handles events related to JPEG capture. |
| */ |
| private CameraCaptureSession.CaptureCallback mCaptureCallback |
| = new CameraCaptureSession.CaptureCallback() { |
| |
| private void process(CaptureResult result) { |
| switch (mState) { |
| case STATE_PREVIEW: { |
| // We have nothing to do when the camera preview is working normally. |
| break; |
| } |
| case STATE_WAITING_LOCK: { |
| Integer afState = result.get(CaptureResult.CONTROL_AF_STATE); |
| if (afState == null) { |
| captureStillPicture(); |
| } else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState || |
| CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) { |
| // CONTROL_AE_STATE can be null on some devices |
| Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); |
| if (aeState == null || |
| aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) { |
| mState = STATE_PICTURE_TAKEN; |
| captureStillPicture(); |
| } else { |
| runPrecaptureSequence(); |
| } |
| } |
| break; |
| } |
| case STATE_WAITING_PRECAPTURE: { |
| // CONTROL_AE_STATE can be null on some devices |
| Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); |
| if (aeState == null || |
| aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE || |
| aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) { |
| mState = STATE_WAITING_NON_PRECAPTURE; |
| } |
| break; |
| } |
| case STATE_WAITING_NON_PRECAPTURE: { |
| // CONTROL_AE_STATE can be null on some devices |
| Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE); |
| if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) { |
| mState = STATE_PICTURE_TAKEN; |
| captureStillPicture(); |
| } |
| break; |
| } |
| } |
| } |
| |
| @Override |
| public void onCaptureProgressed(@NonNull CameraCaptureSession session, |
| @NonNull CaptureRequest request, |
| @NonNull CaptureResult partialResult) { |
| process(partialResult); |
| } |
| |
| @Override |
| public void onCaptureCompleted(@NonNull CameraCaptureSession session, |
| @NonNull CaptureRequest request, |
| @NonNull TotalCaptureResult result) { |
| process(result); |
| } |
| |
| }; |
| |
| /** |
| * Shows a {@link Toast} on the UI thread. |
| * |
| * @param text The message to show |
| */ |
| private void showToast(final String text) { |
| final Activity activity = getActivity(); |
| if (activity != null) { |
| activity.runOnUiThread(new Runnable() { |
| @Override |
| public void run() { |
| Toast.makeText(activity, text, Toast.LENGTH_SHORT).show(); |
| } |
| }); |
| } |
| } |
| |
| /** |
| * Given {@code choices} of {@code Size}s supported by a camera, choose the smallest one that |
| * is at least as large as the respective texture view size, and that is at most as large as the |
| * respective max size, and whose aspect ratio matches with the specified value. If such size |
| * doesn't exist, choose the largest one that is at most as large as the respective max size, |
| * and whose aspect ratio matches with the specified value. |
| * |
| * @param choices The list of sizes that the camera supports for the intended output |
| * class |
| * @param textureViewWidth The width of the texture view relative to sensor coordinate |
| * @param textureViewHeight The height of the texture view relative to sensor coordinate |
| * @param maxWidth The maximum width that can be chosen |
| * @param maxHeight The maximum height that can be chosen |
| * @param aspectRatio The aspect ratio |
| * @return The optimal {@code Size}, or an arbitrary one if none were big enough |
| */ |
| private static Size chooseOptimalSize(Size[] choices, int textureViewWidth, |
| int textureViewHeight, int maxWidth, int maxHeight, Size aspectRatio) { |
| |
| // Collect the supported resolutions that are at least as big as the preview Surface |
| List<Size> bigEnough = new ArrayList<>(); |
| // Collect the supported resolutions that are smaller than the preview Surface |
| List<Size> notBigEnough = new ArrayList<>(); |
| int w = aspectRatio.getWidth(); |
| int h = aspectRatio.getHeight(); |
| for (Size option : choices) { |
| if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight && |
| option.getHeight() == option.getWidth() * h / w) { |
| if (option.getWidth() >= textureViewWidth && |
| option.getHeight() >= textureViewHeight) { |
| bigEnough.add(option); |
| } else { |
| notBigEnough.add(option); |
| } |
| } |
| } |
| |
| // Pick the smallest of those big enough. If there is no one big enough, pick the |
| // largest of those not big enough. |
| if (bigEnough.size() > 0) { |
| return Collections.min(bigEnough, new CompareSizesByArea()); |
| } else if (notBigEnough.size() > 0) { |
| return Collections.max(notBigEnough, new CompareSizesByArea()); |
| } else { |
| Log.e(TAG, "Couldn't find any suitable preview size"); |
| return choices[0]; |
| } |
| } |
| |
| public static Camera2BasicFragment newInstance() { |
| return new Camera2BasicFragment(); |
| } |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| return inflater.inflate(R.layout.fragment_camera2_basic, container, false); |
| } |
| |
| @Override |
| public void onViewCreated(final View view, Bundle savedInstanceState) { |
| view.findViewById(R.id.picture).setOnClickListener(this); |
| view.findViewById(R.id.info).setOnClickListener(this); |
| mTextureView = (AutoFitTextureView) view.findViewById(R.id.texture); |
| } |
| |
| @Override |
| public void onActivityCreated(Bundle savedInstanceState) { |
| super.onActivityCreated(savedInstanceState); |
| mFile = new File(getActivity().getExternalFilesDir(null), "pic.jpg"); |
| } |
| |
| @Override |
| public void onResume() { |
| super.onResume(); |
| startBackgroundThread(); |
| |
| // When the screen is turned off and turned back on, the SurfaceTexture is already |
| // available, and "onSurfaceTextureAvailable" will not be called. In that case, we can open |
| // a camera and start preview from here (otherwise, we wait until the surface is ready in |
| // the SurfaceTextureListener). |
| if (mTextureView.isAvailable()) { |
| openCamera(mTextureView.getWidth(), mTextureView.getHeight()); |
| } else { |
| mTextureView.setSurfaceTextureListener(mSurfaceTextureListener); |
| } |
| } |
| |
| @Override |
| public void onPause() { |
| closeCamera(); |
| stopBackgroundThread(); |
| super.onPause(); |
| } |
| |
| private void requestCameraPermission() { |
| if (FragmentCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { |
| new ConfirmationDialog().show(getChildFragmentManager(), FRAGMENT_DIALOG); |
| } else { |
| FragmentCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, |
| REQUEST_CAMERA_PERMISSION); |
| } |
| } |
| |
| @Override |
| public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, |
| @NonNull int[] grantResults) { |
| if (requestCode == REQUEST_CAMERA_PERMISSION) { |
| if (grantResults.length != 1 || grantResults[0] != PackageManager.PERMISSION_GRANTED) { |
| ErrorDialog.newInstance(getString(R.string.request_permission)) |
| .show(getChildFragmentManager(), FRAGMENT_DIALOG); |
| } |
| } else { |
| super.onRequestPermissionsResult(requestCode, permissions, grantResults); |
| } |
| } |
| |
| /** |
| * Sets up member variables related to camera. |
| * |
| * @param width The width of available size for camera preview |
| * @param height The height of available size for camera preview |
| */ |
| private void setUpCameraOutputs(int width, int height) { |
| Activity activity = getActivity(); |
| CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE); |
| try { |
| for (String cameraId : manager.getCameraIdList()) { |
| CameraCharacteristics characteristics |
| = manager.getCameraCharacteristics(cameraId); |
| |
| // We don't use a front facing camera in this sample. |
| Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING); |
| if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) { |
| continue; |
| } |
| |
| StreamConfigurationMap map = characteristics.get( |
| CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP); |
| if (map == null) { |
| continue; |
| } |
| |
| // For still image captures, we use the largest available size. |
| Size largest = Collections.max( |
| Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)), |
| new CompareSizesByArea()); |
| mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(), |
| ImageFormat.JPEG, /*maxImages*/2); |
| mImageReader.setOnImageAvailableListener( |
| mOnImageAvailableListener, mBackgroundHandler); |
| |
| // Find out if we need to swap dimension to get the preview size relative to sensor |
| // coordinate. |
| int displayRotation = activity.getWindowManager().getDefaultDisplay().getRotation(); |
| int sensorOrientation = |
| characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION); |
| boolean swappedDimensions = false; |
| switch (displayRotation) { |
| case Surface.ROTATION_0: |
| case Surface.ROTATION_180: |
| if (sensorOrientation == 90 || sensorOrientation == 270) { |
| swappedDimensions = true; |
| } |
| break; |
| case Surface.ROTATION_90: |
| case Surface.ROTATION_270: |
| if (sensorOrientation == 0 || sensorOrientation == 180) { |
| swappedDimensions = true; |
| } |
| break; |
| default: |
| Log.e(TAG, "Display rotation is invalid: " + displayRotation); |
| } |
| |
| Point displaySize = new Point(); |
| activity.getWindowManager().getDefaultDisplay().getSize(displaySize); |
| int rotatedPreviewWidth = width; |
| int rotatedPreviewHeight = height; |
| int maxPreviewWidth = displaySize.x; |
| int maxPreviewHeight = displaySize.y; |
| |
| if (swappedDimensions) { |
| rotatedPreviewWidth = height; |
| rotatedPreviewHeight = width; |
| maxPreviewWidth = displaySize.y; |
| maxPreviewHeight = displaySize.x; |
| } |
| |
| if (maxPreviewWidth > MAX_PREVIEW_WIDTH) { |
| maxPreviewWidth = MAX_PREVIEW_WIDTH; |
| } |
| |
| if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) { |
| maxPreviewHeight = MAX_PREVIEW_HEIGHT; |
| } |
| |
| // Danger, W.R.! Attempting to use too large a preview size could exceed the camera |
| // bus' bandwidth limitation, resulting in gorgeous previews but the storage of |
| // garbage capture data. |
| mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class), |
| rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth, |
| maxPreviewHeight, largest); |
| |
| // We fit the aspect ratio of TextureView to the size of preview we picked. |
| int orientation = getResources().getConfiguration().orientation; |
| if (orientation == Configuration.ORIENTATION_LANDSCAPE) { |
| mTextureView.setAspectRatio( |
| mPreviewSize.getWidth(), mPreviewSize.getHeight()); |
| } else { |
| mTextureView.setAspectRatio( |
| mPreviewSize.getHeight(), mPreviewSize.getWidth()); |
| } |
| |
| // Check if the flash is supported. |
| Boolean available = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE); |
| mFlashSupported = available == null ? false : available; |
| |
| mCameraId = cameraId; |
| return; |
| } |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } catch (NullPointerException e) { |
| // Currently an NPE is thrown when the Camera2API is used but not supported on the |
| // device this code runs. |
| ErrorDialog.newInstance(getString(R.string.camera_error)) |
| .show(getChildFragmentManager(), FRAGMENT_DIALOG); |
| } |
| } |
| |
| /** |
| * Opens the camera specified by {@link Camera2BasicFragment#mCameraId}. |
| */ |
| private void openCamera(int width, int height) { |
| if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) |
| != PackageManager.PERMISSION_GRANTED) { |
| requestCameraPermission(); |
| return; |
| } |
| setUpCameraOutputs(width, height); |
| configureTransform(width, height); |
| Activity activity = getActivity(); |
| CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE); |
| try { |
| if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) { |
| throw new RuntimeException("Time out waiting to lock camera opening."); |
| } |
| manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException("Interrupted while trying to lock camera opening.", e); |
| } |
| } |
| |
| /** |
| * Closes the current {@link CameraDevice}. |
| */ |
| private void closeCamera() { |
| try { |
| mCameraOpenCloseLock.acquire(); |
| if (null != mCaptureSession) { |
| mCaptureSession.close(); |
| mCaptureSession = null; |
| } |
| if (null != mCameraDevice) { |
| mCameraDevice.close(); |
| mCameraDevice = null; |
| } |
| if (null != mImageReader) { |
| mImageReader.close(); |
| mImageReader = null; |
| } |
| } catch (InterruptedException e) { |
| throw new RuntimeException("Interrupted while trying to lock camera closing.", e); |
| } finally { |
| mCameraOpenCloseLock.release(); |
| } |
| } |
| |
| /** |
| * Starts a background thread and its {@link Handler}. |
| */ |
| private void startBackgroundThread() { |
| mBackgroundThread = new HandlerThread("CameraBackground"); |
| mBackgroundThread.start(); |
| mBackgroundHandler = new Handler(mBackgroundThread.getLooper()); |
| } |
| |
| /** |
| * Stops the background thread and its {@link Handler}. |
| */ |
| private void stopBackgroundThread() { |
| mBackgroundThread.quitSafely(); |
| try { |
| mBackgroundThread.join(); |
| mBackgroundThread = null; |
| mBackgroundHandler = null; |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Creates a new {@link CameraCaptureSession} for camera preview. |
| */ |
| private void createCameraPreviewSession() { |
| try { |
| SurfaceTexture texture = mTextureView.getSurfaceTexture(); |
| assert texture != null; |
| |
| // We configure the size of default buffer to be the size of camera preview we want. |
| texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight()); |
| |
| // This is the output Surface we need to start preview. |
| Surface surface = new Surface(texture); |
| |
| // We set up a CaptureRequest.Builder with the output Surface. |
| mPreviewRequestBuilder |
| = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); |
| mPreviewRequestBuilder.addTarget(surface); |
| |
| // Here, we create a CameraCaptureSession for camera preview. |
| mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()), |
| new CameraCaptureSession.StateCallback() { |
| |
| @Override |
| public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) { |
| // The camera is already closed |
| if (null == mCameraDevice) { |
| return; |
| } |
| |
| // When the session is ready, we start displaying the preview. |
| mCaptureSession = cameraCaptureSession; |
| try { |
| // Auto focus should be continuous for camera preview. |
| mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, |
| CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); |
| // Flash is automatically enabled when necessary. |
| setAutoFlash(mPreviewRequestBuilder); |
| |
| // Finally, we start displaying the camera preview. |
| mPreviewRequest = mPreviewRequestBuilder.build(); |
| mCaptureSession.setRepeatingRequest(mPreviewRequest, |
| mCaptureCallback, mBackgroundHandler); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| @Override |
| public void onConfigureFailed( |
| @NonNull CameraCaptureSession cameraCaptureSession) { |
| showToast("Failed"); |
| } |
| }, null |
| ); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`. |
| * This method should be called after the camera preview size is determined in |
| * setUpCameraOutputs and also the size of `mTextureView` is fixed. |
| * |
| * @param viewWidth The width of `mTextureView` |
| * @param viewHeight The height of `mTextureView` |
| */ |
| private void configureTransform(int viewWidth, int viewHeight) { |
| Activity activity = getActivity(); |
| if (null == mTextureView || null == mPreviewSize || null == activity) { |
| return; |
| } |
| int rotation = activity.getWindowManager().getDefaultDisplay().getRotation(); |
| Matrix matrix = new Matrix(); |
| RectF viewRect = new RectF(0, 0, viewWidth, viewHeight); |
| RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth()); |
| float centerX = viewRect.centerX(); |
| float centerY = viewRect.centerY(); |
| if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) { |
| bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY()); |
| matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL); |
| float scale = Math.max( |
| (float) viewHeight / mPreviewSize.getHeight(), |
| (float) viewWidth / mPreviewSize.getWidth()); |
| matrix.postScale(scale, scale, centerX, centerY); |
| matrix.postRotate(90 * (rotation - 2), centerX, centerY); |
| } else if (Surface.ROTATION_180 == rotation) { |
| matrix.postRotate(180, centerX, centerY); |
| } |
| mTextureView.setTransform(matrix); |
| } |
| |
| /** |
| * Initiate a still image capture. |
| */ |
| private void takePicture() { |
| lockFocus(); |
| } |
| |
| /** |
| * Lock the focus as the first step for a still image capture. |
| */ |
| private void lockFocus() { |
| try { |
| // This is how to tell the camera to lock focus. |
| mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, |
| CameraMetadata.CONTROL_AF_TRIGGER_START); |
| // Tell #mCaptureCallback to wait for the lock. |
| mState = STATE_WAITING_LOCK; |
| mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, |
| mBackgroundHandler); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Run the precapture sequence for capturing a still image. This method should be called when |
| * we get a response in {@link #mCaptureCallback} from {@link #lockFocus()}. |
| */ |
| private void runPrecaptureSequence() { |
| try { |
| // This is how to tell the camera to trigger. |
| mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER, |
| CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START); |
| // Tell #mCaptureCallback to wait for the precapture sequence to be set. |
| mState = STATE_WAITING_PRECAPTURE; |
| mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, |
| mBackgroundHandler); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Capture a still picture. This method should be called when we get a response in |
| * {@link #mCaptureCallback} from both {@link #lockFocus()}. |
| */ |
| private void captureStillPicture() { |
| try { |
| final Activity activity = getActivity(); |
| if (null == activity || null == mCameraDevice) { |
| return; |
| } |
| // This is the CaptureRequest.Builder that we use to take a picture. |
| final CaptureRequest.Builder captureBuilder = |
| mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); |
| captureBuilder.addTarget(mImageReader.getSurface()); |
| |
| // Use the same AE and AF modes as the preview. |
| captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, |
| CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); |
| setAutoFlash(captureBuilder); |
| |
| // Orientation |
| int rotation = activity.getWindowManager().getDefaultDisplay().getRotation(); |
| captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation)); |
| |
| CameraCaptureSession.CaptureCallback CaptureCallback |
| = new CameraCaptureSession.CaptureCallback() { |
| |
| @Override |
| public void onCaptureCompleted(@NonNull CameraCaptureSession session, |
| @NonNull CaptureRequest request, |
| @NonNull TotalCaptureResult result) { |
| showToast("Saved: " + mFile); |
| Log.d(TAG, mFile.toString()); |
| unlockFocus(); |
| } |
| }; |
| |
| mCaptureSession.stopRepeating(); |
| mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Unlock the focus. This method should be called when still image capture sequence is |
| * finished. |
| */ |
| private void unlockFocus() { |
| try { |
| // Reset the auto-focus trigger |
| mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, |
| CameraMetadata.CONTROL_AF_TRIGGER_CANCEL); |
| setAutoFlash(mPreviewRequestBuilder); |
| mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, |
| mBackgroundHandler); |
| // After this, the camera will go back to the normal state of preview. |
| mState = STATE_PREVIEW; |
| mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, |
| mBackgroundHandler); |
| } catch (CameraAccessException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| @Override |
| public void onClick(View view) { |
| switch (view.getId()) { |
| case R.id.picture: { |
| takePicture(); |
| break; |
| } |
| case R.id.info: { |
| Activity activity = getActivity(); |
| if (null != activity) { |
| new AlertDialog.Builder(activity) |
| .setMessage(R.string.intro_message) |
| .setPositiveButton(android.R.string.ok, null) |
| .show(); |
| } |
| break; |
| } |
| } |
| } |
| |
| private void setAutoFlash(CaptureRequest.Builder requestBuilder) { |
| if (mFlashSupported) { |
| requestBuilder.set(CaptureRequest.CONTROL_AE_MODE, |
| CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH); |
| } |
| } |
| |
| /** |
| * Saves a JPEG {@link Image} into the specified {@link File}. |
| */ |
| private static class ImageSaver implements Runnable { |
| |
| /** |
| * The JPEG image |
| */ |
| private final Image mImage; |
| /** |
| * The file we save the image into. |
| */ |
| private final File mFile; |
| |
| public ImageSaver(Image image, File file) { |
| mImage = image; |
| mFile = file; |
| } |
| |
| @Override |
| public void run() { |
| ByteBuffer buffer = mImage.getPlanes()[0].getBuffer(); |
| byte[] bytes = new byte[buffer.remaining()]; |
| buffer.get(bytes); |
| FileOutputStream output = null; |
| try { |
| output = new FileOutputStream(mFile); |
| output.write(bytes); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } finally { |
| mImage.close(); |
| if (null != output) { |
| try { |
| output.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| |
| } |
| |
| /** |
| * Compares two {@code Size}s based on their areas. |
| */ |
| static class CompareSizesByArea implements Comparator<Size> { |
| |
| @Override |
| public int compare(Size lhs, Size rhs) { |
| // We cast here to ensure the multiplications won't overflow |
| return Long.signum((long) lhs.getWidth() * lhs.getHeight() - |
| (long) rhs.getWidth() * rhs.getHeight()); |
| } |
| |
| } |
| |
| /** |
| * Shows an error message dialog. |
| */ |
| public static class ErrorDialog extends DialogFragment { |
| |
| private static final String ARG_MESSAGE = "message"; |
| |
| public static ErrorDialog newInstance(String message) { |
| ErrorDialog dialog = new ErrorDialog(); |
| Bundle args = new Bundle(); |
| args.putString(ARG_MESSAGE, message); |
| dialog.setArguments(args); |
| return dialog; |
| } |
| |
| @Override |
| public Dialog onCreateDialog(Bundle savedInstanceState) { |
| final Activity activity = getActivity(); |
| return new AlertDialog.Builder(activity) |
| .setMessage(getArguments().getString(ARG_MESSAGE)) |
| .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { |
| @Override |
| public void onClick(DialogInterface dialogInterface, int i) { |
| activity.finish(); |
| } |
| }) |
| .create(); |
| } |
| |
| } |
| |
| /** |
| * Shows OK/Cancel confirmation dialog about camera permission. |
| */ |
| public static class ConfirmationDialog extends DialogFragment { |
| |
| @Override |
| public Dialog onCreateDialog(Bundle savedInstanceState) { |
| final Fragment parent = getParentFragment(); |
| return new AlertDialog.Builder(getActivity()) |
| .setMessage(R.string.request_permission) |
| .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { |
| @Override |
| public void onClick(DialogInterface dialog, int which) { |
| FragmentCompat.requestPermissions(parent, |
| new String[]{Manifest.permission.CAMERA}, |
| REQUEST_CAMERA_PERMISSION); |
| } |
| }) |
| .setNegativeButton(android.R.string.cancel, |
| new DialogInterface.OnClickListener() { |
| @Override |
| public void onClick(DialogInterface dialog, int which) { |
| Activity activity = parent.getActivity(); |
| if (activity != null) { |
| activity.finish(); |
| } |
| } |
| }) |
| .create(); |
| } |
| } |
| |
| } |
