Android5.1.1 自带Camera2/SnapdragonCamera的apk拍照方向旋转90°

实际上这个原因是因为机器里没有重力感应器造成的。

根据Camera2/src/com/android/camera/PhotoModule.java 的代码查看原因。

160 // The degrees of the device rotated clockwise from its natural orientation.

<span style="white-space:pre">	</span>// 设备的角度旋转按顺时针旋转的自然方向

161     private int mOrientation = OrientationEventListener.ORIENTATION_UNKNOWN;

………………

1298 // Set JPEG orientation. Even if screen UI is locked in portrait, camera orientation should
1299 // still match device orientation (e.g., users should always get landscape photos while
1300 // capturing by putting device in landscape.)

1301         int orientation = mActivity.isAutoRotateScreen() ? mDisplayRotation : mOrientation;//是否自动旋转的屏幕？
1302         Characteristics info = mActivity.getCameraProvider().getCharacteristics(mCameraId);
1303         mJpegRotation = info.getJpegOrientation(orientation);//利用orientation获得Jpeg的方向
1304         mCameraDevice.setJpegOrientation(mJpegRotation);//设置输出的Jpeg方向

可以得知这里是和设置角度有关的，可是查找全篇得知mOrientation只在如下代码片段修改

1347 @Override
1348 public void onOrientationChanged(int orientation) {
1349 if (orientation == OrientationEventListener.ORIENTATION_UNKNOWN) {
1350 return;
1351 }
1352
1353 // TODO: Document orientation compute logic and unify them in OrientationManagerImpl.
1354 // b/17443789
1355 // Flip to counter-clockwise orientation.
1356 mOrientation = (360 - orientation) % 360;
1357 }这个函数在由方向传感器发生变化后才触发，实际上是由PhotoModule继承的接口SensorEventListener有关。
101 public class PhotoModule
102 extends CameraModule
103 implements PhotoController,
104 ModuleController,
105 MemoryListener,
106 FocusOverlayManager.Listener,
107 SensorEventListener,
108 SettingsManager.OnSettingChangedListener,
109 RemoteCameraModule,
110 CountDownView.OnCountDownStatusListener 因此在没有开启自动旋转或者没有方向传感器的时候可以将
-- private int mOrientation = OrientationEventListener.ORIENTATION_UNKNOWN;++     private int mOrientation = 270;
搞定！