Camera2使用surface支持
surfaceview是运行在子线程,可以为相机提供不断的刷新
public class MainActivity extends AppCompatActivity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getSupportFragmentManager().beginTransaction().add(R.id.relative, new BlankFragment()).commit(); } }
主activity用于启动一个Fragment在fragment中启动相机
public class BlankFragment extends Fragment { public static final int REQUEST_CAMERA_CODE = 100; public static final String PACKAGE = "package:"; private static final SparseIntArray ORIENTATIONS = new SparseIntArray(); ///为了使照片竖直显示 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); } private SurfaceView mSurfaceView; private SurfaceHolder mSurfaceHolder; private ImageView iv_show; private ImageView mCatture; private CameraManager mCameraManager;//摄像头管理器 private Handler childHandler, mainHandler; private String mCameraID;//摄像头Id 0 为后 1 为前 private ImageReader mImageReader; private CameraCaptureSession mCameraCaptureSession; private CameraDevice mCameraDevice; /** * 摄像头创建监听 */ private CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() { @Override public void onOpened(CameraDevice camera) {//打开摄像头 mCameraDevice = camera; //开启预览 takePreview(); } @Override public void onDisconnected(CameraDevice camera) {//关闭摄像头 if (null != mCameraDevice) { mCameraDevice.close(); mCameraDevice = null; } } @Override public void onError(CameraDevice camera, int error) {//发生错误 Toast.makeText(getContext(), "摄像头开启失败", Toast.LENGTH_SHORT).show(); } }; public static BlankFragment newInstance() { return new BlankFragment(); } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = inflater.inflate(R.layout.fragment_blank, container, false); initVIew(root); initListener(); return root; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public void onResume() { super.onResume(); } /** * 初始化 */ private void initVIew(View root) { iv_show = (ImageView) root.findViewById(R.id.iv_show_camera2); //mSurfaceView mSurfaceView = (SurfaceView) root.findViewById(R.id.surface_view_camera2); mCatture = (ImageView) root.findViewById(R.id.capture); mSurfaceHolder = mSurfaceView.getHolder(); mSurfaceHolder.setKeepScreenOn(true); // mSurfaceView添加回调 mSurfaceHolder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { //SurfaceView创建 // 初始化Camera initCamera2(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { //SurfaceView销毁 // 释放Camera资源 if (null != mCameraDevice) { mCameraDevice.close(); mCameraDevice = null; } } }); } /** * 初始化Camera2 */ @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) private void initCamera2() { HandlerThread handlerThread = new HandlerThread("Camera2"); handlerThread.start(); childHandler = new Handler(handlerThread.getLooper()); mainHandler = new Handler(getMainLooper()); mCameraID = "" + CameraCharacteristics.LENS_FACING_FRONT;//后摄像头 mImageReader = ImageReader.newInstance(1080, 1920, ImageFormat.JPEG, 1); mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() { //可以在这里处理拍照得到的临时照片 例如，写入本地 @Override public void onImageAvailable(ImageReader reader) { //mCameraDevice.close(); // 拿到拍照照片数据 Image image = reader.acquireNextImage(); ByteBuffer buffer = image.getPlanes()[0].getBuffer(); byte[] bytes = new byte[buffer.remaining()]; buffer.get(bytes);//由缓冲区存入字节数组 final Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length); if (bitmap != null) { iv_show.setImageBitmap(bitmap); } } }, mainHandler); //获取摄像头管理 mCameraManager = (CameraManager) getContext().getSystemService(Context.CAMERA_SERVICE); try { if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { //申请WRITE_EXTERNAL_STORAGE权限 requestPermissions(new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_CODE); //return; } else { //打开摄像头 mCameraManager.openCamera(mCameraID, stateCallback, mainHandler); } } catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode == REQUEST_CAMERA_CODE) { if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { // Permission Granted try { mCameraManager.openCamera(mCameraID, stateCallback, mainHandler); } catch (CameraAccessException e) { e.printStackTrace(); } catch (SecurityException e) { e.printStackTrace(); } } else { // Permission Denied } } } /** * 开始预览 */ private void takePreview() { try { // 创建预览需要的CaptureRequest.Builder final CaptureRequest.Builder previewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); // 将SurfaceView的surface作为CaptureRequest.Builder的目标 previewRequestBuilder.addTarget(mSurfaceHolder.getSurface()); // 创建CameraCaptureSession，该对象负责管理处理预览请求和拍照请求 mCameraDevice.createCaptureSession(Arrays.asList(mSurfaceHolder.getSurface(), mImageReader.getSurface()), new CameraCaptureSession.StateCallback() // ③ { @Override public void onConfigured(CameraCaptureSession cameraCaptureSession) { if (null == mCameraDevice) return; // 当摄像头已经准备好时，开始显示预览 mCameraCaptureSession = cameraCaptureSession; try { // 自动对焦 previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); // 打开闪光灯 previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH); // 显示预览 CaptureRequest previewRequest = previewRequestBuilder.build(); mCameraCaptureSession.setRepeatingRequest(previewRequest, null, childHandler); } catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) { Toast.makeText(getContext(), "配置失败", Toast.LENGTH_SHORT).show(); } }, childHandler); } catch (CameraAccessException e) { e.printStackTrace(); } } /** * 拍照 */ private void takePicture() { if (mCameraDevice == null) return; // 创建拍照需要的CaptureRequest.Builder final CaptureRequest.Builder captureRequestBuilder; try { captureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); // 将imageReader的surface作为CaptureRequest.Builder的目标 captureRequestBuilder.addTarget(mImageReader.getSurface()); // 自动对焦 captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); // 自动曝光 captureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH); // 获取手机方向 int rotation = getActivity().getWindowManager().getDefaultDisplay().getRotation(); // 根据设备方向计算设置照片的方向 captureRequestBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation)); //拍照 CaptureRequest mCaptureRequest = captureRequestBuilder.build(); mCameraCaptureSession.capture(mCaptureRequest, null, childHandler); } catch (CameraAccessException e) { e.printStackTrace(); } } private void initListener() { mCatture.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { takePicture(); } }); } }
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<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=".BlankFragment"> <SurfaceView android:id="@+id/surface_view_camera2" android:layout_width="match_parent" android:layout_height="match_parent"/> <ImageView android:id="@+id/capture" android:layout_width="90dp" android:layout_height="90dp" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="20dp" android:src="@mipmap/ic5"/> <ImageView android:id="@+id/iv_show_camera2" android:layout_width="80dp" android:layout_height="80dp" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_marginBottom="20dp" android:layout_marginRight="20dp" android:src="@mipmap/ic_launcher" android:scaleType="centerCrop"/> </RelativeLayout>
上面是fragment的布局,activity的布局是空的,只有一个id relative
