android.hardware.Camera.setPreviewCallback()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.setPreviewCallback()方法的一些代码示例，展示了Camera.setPreviewCallback()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.setPreviewCallback()方法的具体详情如下：
包路径：android.hardware.Camera
类名称：Camera
方法名：setPreviewCallback

Camera.setPreviewCallback介绍

暂无

代码示例

代码示例来源：origin: daniulive/SmarterStreaming

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
  Log.i(TAG, "surfaceDestroyed");
  mCamera.setPreviewCallback(null);
  mCamera.stopPreview();
  mCamera.release();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testClearPreviewCallback() throws Exception {
 TestPreviewCallback callback = new TestPreviewCallback();
 assertThat(callback.camera).isNull();
 assertThat(callback.data).isNull();
 camera.setPreviewCallback(callback);
 camera.setPreviewCallback(null);
 shadowCamera.invokePreviewCallback("foobar".getBytes(UTF_8));
 assertThat(callback.camera).isNull();
 assertThat(callback.data).isNull();
 camera.setOneShotPreviewCallback(callback);
 camera.setOneShotPreviewCallback(null);
 shadowCamera.invokePreviewCallback("foobar".getBytes(UTF_8));
 assertThat(callback.camera).isNull();
 assertThat(callback.data).isNull();
 camera.setPreviewCallbackWithBuffer(callback);
 camera.setPreviewCallbackWithBuffer(null);
 shadowCamera.invokePreviewCallback("foobar".getBytes(UTF_8));
 assertThat(callback.camera).isNull();
 assertThat(callback.data).isNull();
}

代码示例来源：origin: TommyLemon/APIJSON

public void onPreviewFrame(byte[] data, Camera camera) {
 Point cameraResolution = configManager.getCameraResolution();
 if (!useOneShotPreviewCallback) {
  camera.setPreviewCallback(null);
 }
 if (previewHandler != null) {
  Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
    cameraResolution.y, data);
  message.sendToTarget();
  previewHandler = null;
 } else {
  Log.d(TAG, "Got preview callback, but no handler for it");
 }
}

代码示例来源：origin: yipianfengye/android-zxingLibrary

public void onPreviewFrame(byte[] data, Camera camera) {
  Point cameraResolution = configManager.getCameraResolution();
  if (!useOneShotPreviewCallback) {
    camera.setPreviewCallback(null);
  }
  if (previewHandler != null) {
    Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
        cameraResolution.y, data);
    message.sendToTarget();
    previewHandler = null;
  } else {
    Log.d(TAG, "Got preview callback, but no handler for it");
  }
}

代码示例来源：origin: TommyLemon/Android-ZBLibrary

public void onPreviewFrame(byte[] data, Camera camera) {
 Point cameraResolution = configManager.getCameraResolution();
 if (!useOneShotPreviewCallback) {
  camera.setPreviewCallback(null);
 }
 if (previewHandler != null) {
  Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
    cameraResolution.y, data);
  message.sendToTarget();
  previewHandler = null;
 } else {
  Log.d(TAG, "Got preview callback, but no handler for it");
 }
}

代码示例来源：origin: daniulive/SmarterStreaming

private void switchCamera() throws IOException {
  mCamera.setPreviewCallback(null);
  mCamera.stopPreview();
  mCamera.release();
  if (currentCameraType == FRONT) {
    mCamera = openCamera(BACK);
  } else if (currentCameraType == BACK) {
    mCamera = openCamera(FRONT);
  }
  initCamera(mSurfaceHolder);
}

代码示例来源：origin: TommyLemon/APIJSON

/**
 * Tells the camera to stop drawing preview frames.
 */
public void stopPreview() {
  if (camera != null && previewing) {
    if (!useOneShotPreviewCallback) {
      camera.setPreviewCallback(null);
    }
    camera.stopPreview();
    previewCallback.setHandler(null, 0);
    autoFocusCallback.setHandler(null, 0);
    previewing = false;
  }
}

代码示例来源：origin: daniulive/SmarterStreaming

private void switchCamera() throws IOException
{
   pushCamera.setPreviewCallback(null);
   pushCamera.stopPreview();
   pushCamera.release();
   if( pushCurrentCameraType == FRONT){
    pushCamera = openCamera(BACK);
   }else if(pushCurrentCameraType == BACK){
    pushCamera = openCamera(FRONT);
   }
    
   initPushCamera(pushSurfaceHolder);
}

代码示例来源：origin: yipianfengye/android-zxingLibrary

/**
 * Tells the camera to stop drawing preview frames.
 */
public void stopPreview() {
  if (camera != null && previewing) {
    if (!useOneShotPreviewCallback) {
      camera.setPreviewCallback(null);
    }
    camera.stopPreview();
    previewCallback.setHandler(null, 0);
    autoFocusCallback.setHandler(null, 0);
    previewing = false;
  }
}

代码示例来源：origin: TommyLemon/Android-ZBLibrary

/**
 * Tells the camera to stop drawing preview frames.
 */
public void stopPreview() {
  if (camera != null && previewing) {
    if (!useOneShotPreviewCallback) {
      camera.setPreviewCallback(null);
    }
    camera.stopPreview();
    previewCallback.setHandler(null, 0);
    autoFocusCallback.setHandler(null, 0);
    previewing = false;
  }
}

代码示例来源：origin: cats-oss/android-gpuimage

@Override
  public void run() {
    int[] textures = new int[1];
    GLES20.glGenTextures(1, textures, 0);
    surfaceTexture = new SurfaceTexture(textures[0]);
    try {
      camera.setPreviewTexture(surfaceTexture);
      camera.setPreviewCallback(GPUImageRenderer.this);
      camera.startPreview();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
});

代码示例来源：origin: LaiFeng-Android/SopCastComponent

public synchronized void stopPreview() {
  if(mState != State.PREVIEW) {
    return;
  }
  if(mCameraDevice == null) {
    return;
  }
  mCameraDevice.setPreviewCallback(null);
  Camera.Parameters cameraParameters = mCameraDevice.getParameters();
  if (cameraParameters != null && cameraParameters.getFlashMode() != null
      && !cameraParameters.getFlashMode().equals(Camera.Parameters.FLASH_MODE_OFF)) {
    cameraParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
  }
  mCameraDevice.setParameters(cameraParameters);
  mCameraDevice.stopPreview();
  mState = State.OPENED;
}

代码示例来源：origin: TommyLemon/APIJSON

/**
 * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
 * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
 * respectively.
 *
 * @param handler The handler to send the message to.
 * @param message The what field of the message to be sent.
 */
public void requestPreviewFrame(Handler handler, int message) {
  if (camera != null && previewing) {
    previewCallback.setHandler(handler, message);
    if (useOneShotPreviewCallback) {
      camera.setOneShotPreviewCallback(previewCallback);
    } else {
      camera.setPreviewCallback(previewCallback);
    }
  }
}

代码示例来源：origin: yipianfengye/android-zxingLibrary

/**
 * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
 * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
 * respectively.
 *
 * @param handler The handler to send the message to.
 * @param message The what field of the message to be sent.
 */
public void requestPreviewFrame(Handler handler, int message) {
  if (camera != null && previewing) {
    previewCallback.setHandler(handler, message);
    if (useOneShotPreviewCallback) {
      camera.setOneShotPreviewCallback(previewCallback);
    } else {
      camera.setPreviewCallback(previewCallback);
    }
  }
}

代码示例来源：origin: TommyLemon/Android-ZBLibrary

/**
 * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
 * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
 * respectively.
 *
 * @param handler The handler to send the message to.
 * @param message The what field of the message to be sent.
 */
public void requestPreviewFrame(Handler handler, int message) {
  if (camera != null && previewing) {
    previewCallback.setHandler(handler, message);
    if (useOneShotPreviewCallback) {
      camera.setOneShotPreviewCallback(previewCallback);
    } else {
      camera.setPreviewCallback(previewCallback);
    }
  }
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testSetPreviewCallbacks() throws Exception {
 TestPreviewCallback callback = new TestPreviewCallback();
 assertThat(callback.camera).isNull();
 assertThat(callback.data).isNull();
 camera.setPreviewCallback(callback);
 shadowCamera.invokePreviewCallback("foobar".getBytes(UTF_8));
 assertThat(callback.camera).isSameAs(camera);
 assertThat(callback.data).isEqualTo("foobar".getBytes(UTF_8));
}

代码示例来源：origin: yipianfengye/android-zxingLibrary

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
  hasSurface = false;
  if (camera != null) {
    if (camera != null && CameraManager.get().isPreviewing()) {
      if (!CameraManager.get().isUseOneShotPreviewCallback()) {
        camera.setPreviewCallback(null);
      }
      camera.stopPreview();
      CameraManager.get().getPreviewCallback().setHandler(null, 0);
      CameraManager.get().getAutoFocusCallback().setHandler(null, 0);
      CameraManager.get().setPreviewing(false);
    }
  }
}

代码示例来源：origin: doggycoder/AndroidOpenGLDemo

public void setOnPreviewFrameCallback(final IAiyaCamera.PreviewFrameCallback callback) {
  if(mCamera!=null){
    mCamera.setPreviewCallback(new Camera.PreviewCallback() {
      @Override
      public void onPreviewFrame(byte[] data, Camera camera) {
        callback.onPreviewFrame(data,mPreSize.x,mPreSize.y);
      }
    });
  }
}

代码示例来源：origin: doggycoder/AndroidOpenGLDemo

@Override
public void setOnPreviewFrameCallback(final PreviewFrameCallback callback) {
  if(mCamera!=null){
    mCamera.setPreviewCallback(new Camera.PreviewCallback() {
      @Override
      public void onPreviewFrame(byte[] data, Camera camera) {
        callback.onPreviewFrame(data,mPreSize.x,mPreSize.y);
      }
    });
  }
}

代码示例来源：origin: stackoverflow.com

public void surfaceChanged(SurfaceHolder holder,int format, int width,int height) 
    {
      camera.setPreviewCallback(new PreviewCallback() {

        public void onPreviewFrame(byte[] data, Camera camera) {

          Camera.Parameters parameters = camera.getParameters();

          int width = parameters.getPreviewSize().width;
          int height = parameters.getPreviewSize().height;

          ByteArrayOutputStream outstr = new ByteArrayOutputStream();
          Rect rect = new Rect(0, 0, width, height); 
          YuvImage yuvimage=new YuvImage(data,ImageFormat.NV21,width,height,null);
          yuvimage.compressToJpeg(rect, 100, outstr);
          Bitmap bmp = BitmapFactory.decodeByteArray(outstr.toByteArray(), 0, outstr.size());
        }
}
}

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