相机2最大1440x1080

我正在尝试使用横向（1920x1080）显示正常的全高清预览Camera2，但相机返回 1440x1080 作为最高分辨率。

使用旧相机（android.hardware.camera）同一设备没有这样的问题。我究竟做错了什么？

CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
cameraId = manager.getCameraIdList()[0];
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
assert map != null;
imageDimension = map.getOutputSizes(SurfaceTexture.class)[0];

for (Size size : map.getOutputSizes(SurfaceTexture.class)) {
    Log.i(TAG, "imageDimension " + size);
}

Output:

imageDimension 1440x1080
imageDimension 1280x960
imageDimension 1280x720
imageDimension 864x480
imageDimension 640x640
imageDimension 832x486
imageDimension 800x480
imageDimension 720x480
imageDimension 768x432
imageDimension 640x480

另外，为了在横向中正确显示预览，我们似乎需要很多令人头疼的代码，例如：

private void configureTransform(int viewWidth, int viewHeight) {
        Activity activity = getActivity();
        if (null == mTextureView || null == mPreviewSize || null == activity) {
            return;
        }
        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
        Matrix matrix = new Matrix();
        RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
        RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
        float centerX = viewRect.centerX();
        float centerY = viewRect.centerY();
        if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
            bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
            matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
            float scale = Math.max(
                    (float) viewHeight / mPreviewSize.getHeight(),
                    (float) viewWidth / mPreviewSize.getWidth());
            matrix.postScale(scale, scale, centerX, centerY);
            matrix.postRotate(90 * (rotation - 2), centerX, centerY);
        } else if (Surface.ROTATION_180 == rotation) {
            matrix.postRotate(180, centerX, centerY);
        }
        mTextureView.setTransform(matrix);
    }

来自官方样本https://github.com/googlesamples/android-Camera2Basic/blob/master/Application/src/main/java/com/example/android/camera2basic/Camera2BasicFragment.java#L740 https://github.com/googlesamples/android-Camera2Basic/blob/master/Application/src/main/java/com/example/android/camera2basic/Camera2BasicFragment.java#L740

Camera2 不是应该比传统相机更容易吗？我不知道...

虽然我看到一件好事：我们可以设置许多表面目标，但我们无法使用传统相机setPreviewDisplay and setPreviewTexture在一起，但 Camera2 允许多个输出

UPDATE

OMG!

接下来的信息让我震惊：

附注我在小米设备上测试过

Android Camera2 输出尺寸 https://stackoverflow.com/questions/31362202/android-camera2-output-sizes

https://github.com/googlesamples/android-Camera2Basic/issues/113 https://github.com/googlesamples/android-Camera2Basic/issues/113

https://github.com/googlesamples/android-Camera2Basic/issues/123 https://github.com/googlesamples/android-Camera2Basic/issues/123

TL;DR如果你有CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY基本上你的手机制造商不支持Camera API2。

对于那些像我一样最终来到这里的人，您可以在相关中找到解释question https://stackoverflow.com/questions/31362202/android-camera2-output-sizes/55442751#55442751和这个github问题 https://github.com/googlesamples/android-Camera2Basic/issues/123 .