Question

如何将MediaRecorder方向设置为横向或纵向

我一直在试用Android中的MediaRecorder类

我看了一下这段代码

http://www.truiton.com/2015/05/capture-record-android-screen-using-mediaprojection-apis/

我想将正在录制的视频的方向设置为纵向或横向

如何做到这一点

我看了https://developer.android.com/reference/android/media/MediaRecorder.html#setOrientationHint(int)

它指定在Int中设置Rotation，我们应该分别使用Landscape和Portrait的值

Answer 1

int：以度为单位顺时针旋转的角度。支持的角度为0度，90度，180度和270度。

您可以从下面参考MediaRecorder。

您需要获取当前的摄像头方向，然后添加逻辑以根据前置摄像头或后置摄像头设置方向：

以下是camera1API

Camera.CameraInfo camera_info = new Camera.CameraInfo()
int camera_orientation = camera_info.orientation;

以下是camera2API

CameraCharacteristics characteristics;
CameraManager manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);
characteristics = manager.getCameraCharacteristics(cameraIdS);
int camera_orientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);

以下是camera1API和camera2API

的常见问题

摄像机图像的 int camera_orientation 。该值是摄像机图像需要顺时针旋转的角度，因此它在显示屏上以其自然方向正确显示。它应该是0,90,180或270。例如，假设设备具有自然高的屏幕。后置摄像头传感器安装在横向上。你在看屏幕。如果相机传感器的顶部与自然方向的屏幕右边缘对齐，则值应为90.如果前置摄像头传感器的顶部与屏幕右侧对齐，则值应为是270。

private int getDeviceDefaultOrientation() {
    WindowManager windowManager = (WindowManager)this.getContext().getSystemService(Context.WINDOW_SERVICE);
    Configuration config = getResources().getConfiguration();
    int rotation = windowManager.getDefaultDisplay().getRotation();
    if( ( (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180) &&
            config.orientation == Configuration.ORIENTATION_LANDSCAPE )
            || ( (rotation == Surface.ROTATION_90 || rotation == Surface.ROTATION_270) &&    
            config.orientation == Configuration.ORIENTATION_PORTRAIT ) ) {
        return Configuration.ORIENTATION_LANDSCAPE;
    }
    else { 
        return Configuration.ORIENTATION_PORTRAIT;
    }
}

将方向设置为横向

int device_orientation = getDeviceDefaultOrientation();
int result;
if (device_orientation == Configuration.ORIENTATION_PORTRAIT) {
  // should be equivalent to onOrientationChanged(270)
  if (camera_controller.isFrontFacing()) {
    result = (camera_orientation + 90) % 360;
  } else {
    result = (camera_orientation + 270) % 360;
  }
} else {
  // should be equivalent to onOrientationChanged(0)
  result = camera_orientation;
}

将方向设置为纵向

int device_orientation = getDeviceDefaultOrientation();
int result;
if (device_orientation == Configuration.ORIENTATION_PORTRAIT) {
  // should be equivalent to onOrientationChanged(0)
  result = camera_orientation;
} else {
  // should be equivalent to onOrientationChanged(90)
  if (camera_controller.isFrontFacing()) {
    result = (camera_orientation + 270) % 360;
  } else {
    result = (camera_orientation + 90) % 360;
  }
}

如何将MediaRecorder方向设置为横向或纵向

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