自定义SurfaceView
主要步骤：
实现SurfaceHolder.Callback接口，创建SurfaceView的生命周期
实现Camera.PreviewCallback接口，创建预览回调接口
创建Camera打开相机
实例：
public class CameraSurfaceViews extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback{ Context mContext; SurfaceHolder mSurfaceHolder;//surface的控制器 Camera mCamera;//相机类 FrameCallback mCb;//数据回调接口 public void setmCb(FrameCallback mCb) { this.mCb = mCb; }
//获取surfaceView的SurfaceHolder对象和接口 public CameraSurfaceViews(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; mSurfaceHolder = getHolder(); mSurfaceHolder.addCallback(this); }
//寻找相机 private int findCamera(boolean isfront) { int cameraCount = 0; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras(); for (int camIdx = 0; camIdx < cameraCount; camIdx++) { Camera.getCameraInfo(camIdx, cameraInfo); if (isfront) { // CAMERA_FACING_FRONT前置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { return camIdx; } } else { // CAMERA_FACING_BACK后置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) { return camIdx; } } } return -1; } //打开相机 private Camera getCamera() { Camera camera = null; int cameraId = findCamera(false); try { if(cameraId==1){ camera = Camera.open(cameraId ); }else if(cameraId==0)( camera = Camera.open(0); }
} catch (Exception e) { camera = null; } return camera; } //surface被创建时调用 @Override public void surfaceCreated(SurfaceHolder holder) { mCamera = getCamera();
}
//surface大小被改变时调用 @Override public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) { setStartPreview(mCamera,mSurfaceHolder);
}
//surface被销毁时调用 @Override public void surfaceDestroyed(SurfaceHolder holder) { releaseCamera(); } //开启相机预览 private void setStartPreview(Camera camera, SurfaceHolder holder) { try { mCamera.setPreviewDisplay(holder); mCamera.setPreviewCallback(this); camera.startPreview(); } catch (IOException e) { } }
//释放Camera public void releaseCamera() { if (mCamera != null) { mCamera.setPreviewCallback(null); mCamera.stopPreview();// 停掉摄像头的预览 mCamera.release(); mCamera = null; } }
//预览回调，传递yuv视频流数据 @Override public void onPreviewFrame(byte[] bytes, Camera camera) { // Log.i("onPreviewFrame",""+ bytes); if(mCb!= null){ mCb.onDecodeFrame(bytes); } } }
FrameCallback回调接口
public interface FrameCallback { void onDecodeFrame(byte[] data) ; }
MainActivity
public class MainActivity extends AppCompatActivity implements FrameCallback{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onDecodeFrame(byte[] data) { //实时处理yuv视频流数据 } }