This article describes the solution to the problem of rotation of the preview screen when calling Camera in Android programming. Share it for your reference, as follows:
When calling Camera to write applications, the situation of front and rear cameras is sometimes different. Sometimes, even though the rear camera is clearly not a problem, but when calling the front camera, it is reversed by 180°, or other angles, and it is hard to figure it out. After checking the Android source code, I found that its solution is very good. Next, I will post a source code for future viewing.
public static int getDisplayRotation(Activity activity) {
int rotation = ().getDefaultDisplay()
.getRotation();
switch (rotation) {
case Surface.ROTATION_0: return 0;
case Surface.ROTATION_90: return 90;
case Surface.ROTATION_180: return 180;
case Surface.ROTATION_270: return 270;
}
return 0;
}
public static void setCameraDisplayOrientation(Activity activity,
int cameraId, Camera camera) {
// See for
// documentation.
info = new ();
(cameraId, info);
int degrees = getDisplayRotation(activity);
int result;
if ( == .CAMERA_FACING_FRONT) {
result = ( + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = ( - degrees + 360) % 360;
}
(result);
}
When calling Camera, just call setCameraDisplayOrientation method.
I hope this article will be helpful to everyone's Android programming design.