2017-09-08 48 views
0

我想弄清楚我的应用程序中的Android手机的分辨率。
我用以编程方式查找相机的分辨率

public float getBackCameraResolutionInMp() { 

    try { 
     int noOfCameras = Camera.getNumberOfCameras(); 
     float maxResolution = -1; 
     long pixelCount = -1; 
     Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); 
     Camera.getCameraInfo(BACK_CAMERA_ID, cameraInfo); 
     if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) { 
      try { 
       releaseCameraAndPreview(); 
       if (camera == null) { 
        camera = Camera.open(BACK_CAMERA_ID); 
       } 
       Camera.Parameters cameraParams = camera.getParameters(); 
       for (int j = 0; j < cameraParams.getSupportedPictureSizes().size(); j++) { 
        long pixelCountTemp = cameraParams.getSupportedPictureSizes().get(j).width * cameraParams.getSupportedPictureSizes().get(j).height; // Just changed i to j in this loop 
        if (pixelCountTemp > pixelCount) { 
         pixelCount = pixelCountTemp; 
         maxResolution = ((float) pixelCountTemp)/(1024000.0f); 
        } 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
     return maxResolution; 
    } catch (Exception e) { 
     logException(e, "CameraInfoFragment_getBackCameraResolutionInMp()"); 
     return -1; 
    } 

} 

但它返回我近似分辨率不准确的。如果分辨率是16MP,它会返回我15.55 MP。你能帮我解决相机的确切分辨率吗?

+0

可能重复的[如何获得真正的相机最大百万像素的设备?](https://stackoverflow.com/questions/25590721/how-to-get-real-camera-max-megapixels-of-a-设备) –

回答

0

我认为你不应该除以1024000而是1000000。这里我们谈的是Mega Pixels而不是Mega Bytes使用等于1 Megabyte = 1,048,576 Bytes而是1 Megapixel = 1,000,000 Pixels。加1024000是错的,它应该是10485762^20。除以1000000将给你一个更接近16MP的数字。