我想在按钮点击时强制屏幕方向为横屏，通过设置
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
它可以正常工作。现在我想让应用程序跟随传感器，这样当向纵向倾斜时方向就会恢复为纵向。我知道可以通过设置setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);来实现，但不知道在哪里设置它。如果将方向强制设为横向，则无论您向任何方向倾斜，方向都将保持为横向。有人能指定如何重置方向标志吗？
目前的YouTube应用程序可以满足您的要求。
我在视频播放应用程序中也遇到了同样的问题。
如果用户将设备从竖向旋转成横向，则应初始化OrientationEventListener，该侦听器通过SensorManager通知您设备的方向，范围为0至360。
请观察设备是否倾斜到横向方向范围内，这个范围大约是 (orientation >= 60 && orientation <= 120) || (orientation >= 240 && orientation <= 300) ，并将此状态保存到枚举或标志中。然后，如果设备回到纵向方向范围（orientation <= 40 || orientation >= 320），检查枚举/标志并调用setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);，重置枚举/标志并禁用传感器直到用户再次强制旋转设备。
以下是演示代码：
private enum SensorStateChangeActions {
WATCH_FOR_LANDSCAPE_CHANGES, SWITCH_FROM_LANDSCAPE_TO_STANDARD, WATCH_FOR_POTRAIT_CHANGES, SWITCH_FROM_POTRAIT_TO_STANDARD;
}
private SensorStateChangeActions mSensorStateChanges;
public void goFullScreen() {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
mSensorStateChanges = SensorStateChangeActions.WATCH_FOR_LANDSCAPE_CHANGES;
if (null == sensorEvent)
initialiseSensor(true);
else
sensorEvent.enable();
}
public void shrinkToPotraitMode() {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
mSensorStateChanges = SensorStateChangeActions.WATCH_FOR_POTRAIT_CHANGES;
if (null == sensorEvent)
initialiseSensor(true);
else
sensorEvent.enable();
}
/**
* Initialises system sensor to detect device orientation for player changes.
* Don't enable sensor until playback starts on player
*
* @param enable if set, sensor will be enabled.
*/
private void initialiseSensor(boolean enable) {
sensorEvent = new OrientationEventListener(this,
SensorManager.SENSOR_DELAY_NORMAL) {
@Override
public void onOrientationChanged(int orientation) {
/*
* This logic is useful when user explicitly changes orientation using player controls, in which case orientation changes gives no callbacks.
* we use sensor angle to anticipate orientation and make changes accordingly.
*/
if (null != mSensorStateChanges
&& mSensorStateChanges == SensorStateChangeActions.WATCH_FOR_LANDSCAPE_CHANGES
&& ((orientation >= 60 && orientation <= 120) || (orientation >= 240 && orientation <= 300))) {
mSensorStateChanges = SensorStateChangeActions.SWITCH_FROM_LANDSCAPE_TO_STANDARD;
} else if (null != mSensorStateChanges
&& mSensorStateChanges == SensorStateChangeActions.SWITCH_FROM_LANDSCAPE_TO_STANDARD
&& (orientation <= 40 || orientation >= 320)) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
mSensorStateChanges = null;
sensorEvent.disable();
} else if (null != mSensorStateChanges
&& mSensorStateChanges == SensorStateChangeActions.WATCH_FOR_POTRAIT_CHANGES
&& ((orientation >= 300 && orientation <= 359) || (orientation >= 0 && orientation <= 45))) {
mSensorStateChanges = SensorStateChangeActions.SWITCH_FROM_POTRAIT_TO_STANDARD;
} else if (null != mSensorStateChanges
&& mSensorStateChanges == SensorStateChangeActions.SWITCH_FROM_POTRAIT_TO_STANDARD
&& ((orientation <= 300 && orientation >= 240) || (orientation <= 130 && orientation >= 60))) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
mSensorStateChanges = null;
sensorEvent.disable();
}
}
};
if (enable)
sensorEvent.enable();
}
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)。这取决于您希望传感器何时再次检测旋转。
就我个人而言，在我正在开发的应用程序中，我有一个特定的活动需要处于纵向模式，因此我在该活动的onResume()中使用setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);，并在onPause()中使用setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);，它可以正常工作。当我进入该活动时，如果它不是纵向模式，则设置为纵向模式，并且不允许更改，退出时传感器再次起作用...
您试图在哪里启用和禁用传感器？