问题
I would like to find out the detailed orientation of a device, preferably one of SCREEN_ORIENTATION_LANDSCAPE, SCREEN_ORIENTATION_PORTRAIT, SCREEN_ORIENTATION_REVERSE_LANDSCAPE, SCREEN_ORIENTATION_REVERSE_PORTRAIT from ActivityInfo or equivalent.
Some of the answers here on StackOverflow included
getWindowManager().getDefaultDisplay().getRotation()
but this doesn't really tell me whether the device is in portrait or landscape mode, only how it's turned with reference to its natural position - which in turn can be landscape or portrait in the first place.
getResources().getConfiguration().orientation
returns one of the following three: ORIENTATION_LANDSCAPE, ORIENTATION_PORTRAIT, ORIENTATION_SQUARE, which then doesn't really tell me which way the phone is turned (whether it's upside down or which of the sides it's turned to).
I know I could use the latter in combination with DisplayMetrics to find out the device's natural orientation, but is there really no better way?
回答1:
I ended up using the following solution:
private int getScreenOrientation() {
int rotation = getWindowManager().getDefaultDisplay().getRotation();
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels;
int height = dm.heightPixels;
int orientation;
// if the device's natural orientation is portrait:
if ((rotation == Surface.ROTATION_0
|| rotation == Surface.ROTATION_180) && height > width ||
(rotation == Surface.ROTATION_90
|| rotation == Surface.ROTATION_270) && width > height) {
switch(rotation) {
case Surface.ROTATION_0:
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
break;
case Surface.ROTATION_90:
orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
break;
case Surface.ROTATION_180:
orientation =
ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
break;
case Surface.ROTATION_270:
orientation =
ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
break;
default:
Log.e(TAG, "Unknown screen orientation. Defaulting to " +
"portrait.");
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
break;
}
}
// if the device's natural orientation is landscape or if the device
// is square:
else {
switch(rotation) {
case Surface.ROTATION_0:
orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
break;
case Surface.ROTATION_90:
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
break;
case Surface.ROTATION_180:
orientation =
ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
break;
case Surface.ROTATION_270:
orientation =
ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
break;
default:
Log.e(TAG, "Unknown screen orientation. Defaulting to " +
"landscape.");
orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
break;
}
}
return orientation;
}
NOTE: Some users (Geltrude and holtaf in the comments below) pointed out that this solution will not work on all devices as the direction of rotation from the natural orientation is not standardized.
回答2:
Simple approach would be to use
getResources().getConfiguration().orientation
1 is for Potrait and 2 for Landscape.
回答3:
public static int getScreenOrientation(Activity activity) {
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
int orientation = activity.getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_PORTRAIT) {
if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_270) {
return ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
} else {
return ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
}
}
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90) {
return ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
} else {
return ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
}
}
return ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
}
回答4:
getResources().getConfiguration().orientation is the standard way of knowing current orientation being used. However, if it doesn't fulfill your needs then perhaps you may use Sensors to calculate it in terms of angle. Read this and this
回答5:
I think your problem is that you can detect landscape and portrait but not reverse landscape and reverse protrait as they are not supported in older versions. To detect what you can do is that you can use both oreintation and rotation. I am giving you an idea it may be useful for you.
try this i think it may solve your problem.
int orientation = getResources().getConfiguration().orientation;
int rotation = getWindowManager().getDefaultDisplay().getRotation();
int actual_orientation = -1;
if (orientation == Configuration.ORIENTATION_LANDSCAPE
&& (rotation == Surface.ROTATION_0
|| rotation == Surface.ROTATION_90)){
orientation = Configuration.ORIENTATION_LANDSCAPE;
} else if (orientation == Configuration.ORIENTATION_PORTRAIT
&& (rotation == Surface.ROTATION_0
|| rotation == Surface.ROTATION_90)) {
orientation = Configuration.ORIENTATION_PORTRAIT;
} else if (orientation == Configuration.ORIENTATION_LANDSCAPE
&& (rotation == Surface.ROTATION_180
|| rotation == Surface.ROTATION_270)){
orientation = //any constant for reverse landscape orientation;
} else {
if (orientation == Configuration.ORIENTATION_PORTRAIT
&& (rotation == Surface.ROTATION_180
|| rotation == Surface.ROTATION_270)){
orientation = //any constant for reverse portrait orientation;
}
}
回答6:
I ended up using Zoltán's answer above, which works great, except when I tried it on a tablet (a Samsung P6210 Galaxy Tab 7.0 Plus). In portrait mode, it returned SCREEN_ORIENTATION_REVERSE_PORTRAIT. So in the else statement (if natural orientation is landscape) I swapped the cases for ROTATION_90 and ROTATION_270, and everything seems to work fine. (I don't have enough reputation to post this as a comment to Zoltán's answer.)
回答7:
You could do it in a very simple way:
get the screen widhtand height.
screen width will be always higher when device is in landscape orientation.
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
Toast.makeText(getApplicationContext(), "" + width + "," + height,
Toast.LENGTH_SHORT).show();
if (width > height) {
Toast.makeText(getApplicationContext(), "LandScape",
Toast.LENGTH_SHORT).show();
}
回答8:
Does this solve your problem?
public static int getscrOrientation(Activity act)
{
Display getOrient = act.getWindowManager()
.getDefaultDisplay();
int orientation = getOrient.getOrientation();
// Sometimes you may get undefined orientation Value is 0
// simple logic solves the problem compare the screen
// X,Y Co-ordinates and determine the Orientation in such cases
if (orientation == Configuration.ORIENTATION_UNDEFINED) {
Configuration config = act.getResources().getConfiguration();
orientation = config.orientation;
if (orientation == Configuration.ORIENTATION_UNDEFINED) {
// if height and widht of screen are equal then
// it is square orientation
if (getOrient.getWidth() == getOrient.getHeight()) {
orientation = Configuration.ORIENTATION_SQUARE;
} else { // if widht is less than height than it is portrait
if (getOrient.getWidth() < getOrient.getHeight()) {
orientation = Configuration.ORIENTATION_PORTRAIT;
} else { // if it is not any of the above it will defineitly
// be landscape
orientation = Configuration.ORIENTATION_LANDSCAPE;
}
}
}
}
return orientation; // return value 1 is portrait and 2 is Landscape
// Mode
}
来源：https://stackoverflow.com/questions/10380989/how-do-i-get-the-current-orientation-activityinfo-screen-orientation-of-an-a