小编Lik*_* Ts的帖子

我的相机应用程序预览在低光照下太暗.如果我打开我的谷歌相机,它将增加预览内的亮度,以便我们的脸部可以拍照.但我的预览完全是黑暗的.我处理了亮度和光线传感器.我的Lightsensor工作时很轻.我需要让预览可见.让我知道我该怎么办？

 public void initialBrightness() {
        try {
            brightnessMode = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE);
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }
        if (brightnessMode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
            Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE,
                    Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
            brightnessModeAuto = true;
        }
        Settings.System.putInt(this.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 95);
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = 100;
        getWindow().setAttributes(lp);

    } 

我在调用相机预览类之前在onCreate方法中调用此方法.

NullPointerException在OnPictureTakenMethod中获取一些手机.我正在调用像这样的takePicture方法.

  mCamera.takePicture(shutterCallback, null, mPicture);

我的OnPictureTaken方法

private Camera.PictureCallback mPicture = new Camera.PictureCallback() {


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

            Bitmap bitmap = null;

            if(flashOff) {
                resetCamOnFlashOFF();
            }
            else {
                resetCamOnFlashOn();
            }
            File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
            File dir = new File(sdDir.getAbsolutePath() + "/Camera2/");
            String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
            String fileName = "/IMG_" + timeStamp + ".jpeg";
            boolean mkDir = dir.mkdirs();
            Log.d("Saving Photo","Created the directory" +mkDir);
            ExifInterface exif;
            try {
                exif = new ExifInterface(fileName);
                exif.setAttribute(ExifInterface.TAG_ORIENTATION, "" …