android.hardware.Camera.startPreview()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中android.hardware.Camera.startPreview()方法的一些代码示例，展示了Camera.startPreview()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Camera.startPreview()方法的具体详情如下：
包路径：android.hardware.Camera
类名称：Camera
方法名：startPreview

Camera.startPreview介绍

暂无

代码示例

代码示例来源：origin: stackoverflow.com

Camera cam = Camera.open();     
Parameters p = cam.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
cam.setParameters(p);
cam.startPreview();

代码示例来源：origin: stackoverflow.com

SurfaceView preview = (SurfaceView) findViewById(R.id.PREVIEW);
SurfaceHolder mHolder = preview.getHolder();
mHolder.addCallback(this);
Camera mCamera = Camera.open();
mCamera.setPreviewDisplay(mHolder);

// Turn on LED  
Parameters params = mCamera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(params);      
mCamera.startPreview();

...

// Turn off LED
Parameters params = mCamera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
mCamera.setParameters(params);
mCamera.stopPreview();
mCamera.release();

代码示例来源：origin: stackoverflow.com

public void surfaceCreated(SurfaceHolder surfaceHolder) {
  try {
    mCamera.setPreviewDisplay(surfaceHolder);
    mCamera.startPreview();
  } catch (IOException e) {
  mCamera.stopPreview();
  mCamera.release();
    mCamera.setPreviewDisplay(surfaceHolder);
    mCamera.startPreview();
  } catch (Exception e) {

代码示例来源：origin: googlesamples/android-vision

/**
 * Opens the camera and starts sending preview frames to the underlying detector.  The supplied
 * surface holder is used for the preview so frames can be displayed to the user.
 *
 * @param surfaceHolder the surface holder to use for the preview frames
 * @throws IOException if the supplied surface holder could not be used as the preview display
 */
@RequiresPermission(Manifest.permission.CAMERA)
public CameraSource start(SurfaceHolder surfaceHolder) throws IOException {
  synchronized (mCameraLock) {
    if (mCamera != null) {
      return this;
    }
    mCamera = createCamera();
    mCamera.setPreviewDisplay(surfaceHolder);
    mCamera.startPreview();
    mProcessingThread = new Thread(mFrameProcessor);
    mFrameProcessor.setActive(true);
    mProcessingThread.start();
  }
  return this;
}

代码示例来源：origin: vondear/RxTool

@SuppressLint("NewApi")
void setUpPreview() {
  try {
    if (mPreview.getOutputClass() == SurfaceHolder.class) {
      final boolean needsToStopPreview = mShowingPreview && Build.VERSION.SDK_INT < 14;
      if (needsToStopPreview) {
        mCamera.stopPreview();
      }
      mCamera.setPreviewDisplay(mPreview.getSurfaceHolder());
      if (needsToStopPreview) {
        mCamera.startPreview();
      }
    } else {
      mCamera.setPreviewTexture((SurfaceTexture) mPreview.getSurfaceTexture());
    }
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
}

代码示例来源：origin: vondear/RxTool

@Override
void setDisplayOrientation(int displayOrientation) {
  if (mDisplayOrientation == displayOrientation) {
    return;
  }
  mDisplayOrientation = displayOrientation;
  if (isCameraOpened()) {
    mCameraParameters.setRotation(calcCameraRotation(displayOrientation));
    mCamera.setParameters(mCameraParameters);
    final boolean needsToStopPreview = mShowingPreview && Build.VERSION.SDK_INT < 14;
    if (needsToStopPreview) {
      mCamera.stopPreview();
    }
    mCamera.setDisplayOrientation(calcDisplayOrientation(displayOrientation));
    if (needsToStopPreview) {
      mCamera.startPreview();
    }
  }
}

代码示例来源：origin: stackoverflow.com

myCamera.release();        // release the camera for other applications
myCamera = null;
  mCamera.setPreviewDisplay(mHolder);
  mCamera.startPreview();
  mCamera.setPreviewDisplay(holder);
  mCamera.startPreview();
} catch (IOException e) {

代码示例来源：origin: stackoverflow.com

camera.release();
camera = null;
  camera.startPreview();
  previewIsRunning = true;
  camera.stopPreview();
  previewIsRunning = false;

代码示例来源：origin: robolectric/robolectric

@Test
public void testStopPreview() throws Exception {
 camera.startPreview();
 assertThat(shadowCamera.isPreviewing()).isTrue();
 camera.stopPreview();
 assertThat(shadowCamera.isPreviewing()).isFalse();
}

代码示例来源：origin: stackoverflow.com

Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
setLayoutParams(new FrameLayout.LayoutParams(
  previewSize.width, previewSize.height, Gravity.CENTER));
 } catch (IOException t) {}
mCamera.startPreview();
this.setVisibility(INVISIBLE); // Make the surface invisible as soon as it is created

代码示例来源：origin: chengzichen/KrGallery

@SuppressLint("NewApi")
  @Override
  public void run() {
    Camera camera = session.cameraInfo.camera;
    try {
      if (camera == null) {
        camera = session.cameraInfo.camera = Camera.open(session.cameraInfo.cameraId);
      }
      camera.startPreview();
    } catch (Exception e) {
      session.cameraInfo.camera = null;
      if (camera != null) {
        camera.release();
      }
      e.printStackTrace();
    }
  }
});

代码示例来源：origin: stackoverflow.com

Camera cam;
void ledon() {
  cam = Camera.open();     
  Parameters params = cam.getParameters();
  params.setFlashMode(Parameters.FLASH_MODE_ON);
  cam.setParameters(params);
  cam.startPreview();
  cam.autoFocus(new AutoFocusCallback() {
        public void onAutoFocus(boolean success, Camera camera) {
        }
      });
}

void ledoff() {
  cam.stopPreview();
  cam.release();
}

代码示例来源：origin: vondear/RxTool

/**
 * 打开闪光灯
 *
 * @return
 */
public static void openFlashLight() {
  try {
    if (camera == null) {
      camera = Camera.open();
      camera.startPreview();
    }
    Camera.Parameters parameters = camera.getParameters();
    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
    camera.setParameters(parameters);
  } catch (Exception e) {
    e.printStackTrace();
  }
}

代码示例来源：origin: stackoverflow.com

mCamera.stopPreview();
   mCamera.release();
   mCamera = null;
      mCamera.setPreviewDisplay(holder);  
   } catch (IOException exception) {  
      mCamera.release();  
      mCamera = null;  
public void surfaceChanged(SurfaceHolder holder, int format, int width,
    int height) {
  mCamera.startPreview();

代码示例来源：origin: googlesamples/android-vision

/**
 * Opens the camera and starts sending preview frames to the underlying detector.  The supplied
 * surface holder is used for the preview so frames can be displayed to the user.
 *
 * @param surfaceHolder the surface holder to use for the preview frames
 * @throws IOException if the supplied surface holder could not be used as the preview display
 */
@RequiresPermission(Manifest.permission.CAMERA)
public CameraSource start(SurfaceHolder surfaceHolder) throws IOException {
  synchronized (cameraLock) {
    if (camera != null) {
      return this;
    }
    camera = createCamera();
    camera.setPreviewDisplay(surfaceHolder);
    camera.startPreview();
    processingThread = new Thread(frameProcessor);
    frameProcessor.setActive(true);
    processingThread.start();
  }
  return this;
}

代码示例来源：origin: google/cameraview

@SuppressLint("NewApi")
void setUpPreview() {
  try {
    if (mPreview.getOutputClass() == SurfaceHolder.class) {
      final boolean needsToStopPreview = mShowingPreview && Build.VERSION.SDK_INT < 14;
      if (needsToStopPreview) {
        mCamera.stopPreview();
      }
      mCamera.setPreviewDisplay(mPreview.getSurfaceHolder());
      if (needsToStopPreview) {
        mCamera.startPreview();
      }
    } else {
      mCamera.setPreviewTexture((SurfaceTexture) mPreview.getSurfaceTexture());
    }
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
}

代码示例来源：origin: google/cameraview

@Override
void setDisplayOrientation(int displayOrientation) {
  if (mDisplayOrientation == displayOrientation) {
    return;
  }
  mDisplayOrientation = displayOrientation;
  if (isCameraOpened()) {
    mCameraParameters.setRotation(calcCameraRotation(displayOrientation));
    mCamera.setParameters(mCameraParameters);
    final boolean needsToStopPreview = mShowingPreview && Build.VERSION.SDK_INT < 14;
    if (needsToStopPreview) {
      mCamera.stopPreview();
    }
    mCamera.setDisplayOrientation(calcDisplayOrientation(displayOrientation));
    if (needsToStopPreview) {
      mCamera.startPreview();
    }
  }
}

代码示例来源：origin: stackoverflow.com

Camera camera;   
if (Camera.getNumberOfCameras() >= 2) {

  //if you want to open front facing camera use this line   
  camera = Camera.open(CameraInfo.CAMERA_FACING_FRONT);

  //if you want to use the back facing camera
  camera = Camera.open(CameraInfo.CAMERA_FACING_BACK);                
}

try {
  camera.setPreviewDisplay("your surface holder here");
  camera.startPreview();      
} catch (Exception e) {  
  camera.release();
}

代码示例来源：origin: pedroSG94/rtmp-rtsp-stream-client-java

public void setPreviewOrientation(final int orientation) {
 this.rotation = orientation;
 if (camera != null && running) {
  camera.stopPreview();
  camera.setDisplayOrientation(orientation);
  camera.startPreview();
 }
}

代码示例来源：origin: stackoverflow.com

mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
for(Camera.Size str: mSupportedPreviewSizes)
    Log.e(TAG, str.width + "/" + str.height);
  mCamera.stopPreview();
} catch (Exception e){
  Camera.Parameters parameters = mCamera.getParameters();
  parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
  mCamera.setParameters(parameters);
  mCamera.setDisplayOrientation(90);
  mCamera.setPreviewDisplay(mHolder);
  mCamera.startPreview();

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