java - 如何在 Android Studio Camera2 中找到相机百万像素

Question

这个问题已经有答案了:

How can I get just the camera resolution in android studio (Camera2) (1 个回答)

已关闭 3 年前。

我需要获得百万像素的设备摄像头，但我不知道该怎么做。我想使用 textView，以便可以在应用程序上显示它。

Answer 1

您可以使用这段代码获得百万像素:

    public void getCamerasMegaPixel() {
        Camera camera = Camera.open(0); // For Back Camera
        android.hardware.Camera.Parameters params = camera.getParameters();
        List supportedPictureSizes = params.getSupportedPictureSizes();
        Camera.Size result = null;

        ArrayList<Integer> widthList = new ArrayList<Integer>();
        ArrayList<Integer> heightList = new ArrayList<Integer>();

        for (int i = 0; i < supportedPictureSizes.size(); i++) {
            result = (Camera.Size) supportedPictureSizes.get(i);
            widthList.add(result.width);
            heightList.add(result.height);
        }
        if (widthList.size() != 0 && heightList.size() != 0) {
            System.out.println("Back Megapixel :" + calculateMegaPixel(widthList, heightList));
        }
        camera.release();

        widthList.clear();
        heightList.clear();

        camera = Camera.open(1);        //  For Front Camera
        android.hardware.Camera.Parameters params1 = camera.getParameters();
        List sizes1 = params1.getSupportedPictureSizes();
        Camera.Size result1 = null;
        for (int i = 0; i < sizes1.size(); i++) {
            result1 = (Camera.Size) sizes1.get(i);
            widthList.add(result1.width);
            heightList.add(result1.height);
        }
        if (widthList.size() != 0 && heightList.size() != 0) {
            System.out.println("FRONT Megapixel :" + calculateMegaPixel(widthList, heightList));
        }

        camera.release();
    }

    public float calculateMegaPixel(List<Integer> widthList, List<Integer> heightList) {
        return ((Collections.max(widthList)) * (Collections.max(heightList))) / 1024000;
    }

如果你想使用camera2 api，可以在这里使用:

public String getCamerasMegaPixel() throws CameraAccessException {
    String output = "";
    CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

    String[] cameraIds = manager.getCameraIdList();
    CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraIds[0]);
    output = "back camera mega pixel: " +  calculateMegaPixel(characteristics.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE).getWidth(),
            characteristics.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE).getHeight()) + "\n";

    characteristics = manager.getCameraCharacteristics(cameraIds[1]);
    output +=  "front camera mega pixel: " + calculateMegaPixel(characteristics.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE).getWidth(),characteristics.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE).getHeight()) + "\n";
    return output;
}
public int calculateMegaPixel(float width, float height) {
    return  Math.round((width * height) / 1024000);
}