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
}
}