问题
I want to find the camera screen orientation in locked portrait orientation mode, well I am using camera in my fragment class and I have already set my screen orientation as portrait, but the problem I am facing is, when I turn my camera from portrait to landscape its getting changed and I need to set capture button visible only when the camera is in portrait mode. Can anyone help me to get the orientation changes in portrait mode? Below is my code:
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
sensorManager.registerListener(new SensorEventListener() {
int orientation=-1;;
@Override
public void onSensorChanged(SensorEvent event) {
if (event.values[1] < 6.5 && event.values[1] > -6.5) {
if (orientation!=1) {
Log.d("Sensor", "Landscape");
}
orientation = 1;
} else {
if (orientation!=0) {
Log.d("Sensor", "Portrait");
}
orientation = 0;
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_GAME);
if (orientation == 0) {
// capture button visisble
} else {
// invisible
}
回答1:
You can use OrientationEventListener for this. this is class that customise it.
public abstract class SimpleOrientationListener extends OrientationEventListener {
public static final int CONFIGURATION_ORIENTATION_UNDEFINED = Configuration.ORIENTATION_UNDEFINED;
private volatile int defaultScreenOrientation = CONFIGURATION_ORIENTATION_UNDEFINED;
public int prevOrientation = OrientationEventListener.ORIENTATION_UNKNOWN;
private Context ctx;
private ReentrantLock lock = new ReentrantLock(true);
public SimpleOrientationListener(Context context) {
super(context);
ctx = context;
}
public SimpleOrientationListener(Context context, int rate) {
super(context, rate);
ctx = context;
}
@Override
public void onOrientationChanged(final int orientation) {
int currentOrientation = OrientationEventListener.ORIENTATION_UNKNOWN;
if (orientation >= 330 || orientation < 30) {
currentOrientation = Surface.ROTATION_0;
} else if (orientation >= 60 && orientation < 120) {
currentOrientation = Surface.ROTATION_90;
} else if (orientation >= 150 && orientation < 210) {
currentOrientation = Surface.ROTATION_180;
} else if (orientation >= 240 && orientation < 300) {
currentOrientation = Surface.ROTATION_270;
}
if (prevOrientation != currentOrientation && orientation != OrientationEventListener.ORIENTATION_UNKNOWN) {
prevOrientation = currentOrientation;
if (currentOrientation != OrientationEventListener.ORIENTATION_UNKNOWN)
reportOrientationChanged(currentOrientation);
}
}
private void reportOrientationChanged(final int currentOrientation) {
int defaultOrientation = getDeviceDefaultOrientation();
int orthogonalOrientation = defaultOrientation == Configuration.ORIENTATION_LANDSCAPE ? Configuration.ORIENTATION_PORTRAIT
: Configuration.ORIENTATION_LANDSCAPE;
int toReportOrientation;
if (currentOrientation == Surface.ROTATION_0 || currentOrientation == Surface.ROTATION_180)
toReportOrientation = defaultOrientation;
else
toReportOrientation = orthogonalOrientation;
onSimpleOrientationChanged(toReportOrientation);
}
/**
* Must determine what is default device orientation (some tablets can have default landscape). Must be initialized when device orientation is defined.
*
* @return value of {@link Configuration#ORIENTATION_LANDSCAPE} or {@link Configuration#ORIENTATION_PORTRAIT}
*/
private int getDeviceDefaultOrientation() {
if (defaultScreenOrientation == CONFIGURATION_ORIENTATION_UNDEFINED) {
lock.lock();
defaultScreenOrientation = initDeviceDefaultOrientation(ctx);
lock.unlock();
}
return defaultScreenOrientation;
}
/**
* Provides device default orientation
*
* @return value of {@link Configuration#ORIENTATION_LANDSCAPE} or {@link Configuration#ORIENTATION_PORTRAIT}
*/
private int initDeviceDefaultOrientation(Context context) {
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Configuration config = context.getResources().getConfiguration();
int rotation = windowManager.getDefaultDisplay().getRotation();
boolean isLand = config.orientation == Configuration.ORIENTATION_LANDSCAPE;
boolean isDefaultAxis = rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180;
int result = CONFIGURATION_ORIENTATION_UNDEFINED;
if ((isDefaultAxis && isLand) || (!isDefaultAxis && !isLand)) {
result = Configuration.ORIENTATION_LANDSCAPE;
} else {
result = Configuration.ORIENTATION_PORTRAIT;
}
return result;
}
/**
* Fires when orientation changes from landscape to portrait and vice versa.
*
* @param orientation value of {@link Configuration#ORIENTATION_LANDSCAPE} or {@link Configuration#ORIENTATION_PORTRAIT}
*/
public abstract void onSimpleOrientationChanged(int orientation);
}
Then where you want to detect orientation just call
SimpleOrientationListener mOrientationListener = new SimpleOrientationListener(
context) {
@Override
public void onSimpleOrientationChanged(int orientation) {
if(orientation == Configuration.ORIENTATION_LANDSCAPE){
}else if(orientation == Configuration.ORIENTATION_PORTRAIT){
}
}
};
mOrientationListener.enable();
回答2:
You gonna have to use:
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
//do your stuff with the button
}
}
If you want your activity not to be recreated during orientation then use
android:configChanges="orientation|keyboardHidden|screenSize"
If you want your activity to be forced to stay portrait then you gonna have to use
in your manifest file in the activity you would like just try android:screenOrientation="portrait"
Hope it helps!!!
回答3:
You can achieve the orientation change value, when your activity set to only Portrait or Landscape specific and you want to perform some action when orientation changes.
private OrientationEventListener orientationEventListener;
initialize this variable in your class and implement it's listener in onCreate
orientationEventListener = new OrientationEventListener(this) {
@Override
public void onOrientationChanged(int orientation) {
Log.d("Orientation", orientation + " - " + currentOrientation);
if (orientation >= 330 || orientation < 30) {
currentOrientation = Surface.ROTATION_0;
} else if (orientation >= 60 && orientation < 120) {
currentOrientation = Surface.ROTATION_90;
} else if (orientation >= 150 && orientation < 210) {
currentOrientation = Surface.ROTATION_180;
} else if (orientation >= 240 && orientation < 300) {
currentOrientation = Surface.ROTATION_270;
}
}
};
currentOrentation is integer value for later use in the activity other units.
来源：https://stackoverflow.com/questions/27614439/how-to-detect-my-screen-orientation-in-portrait-locked-screen-in-android