android - 获取手机方向，但将屏幕方向固定为纵向

Question

我想获取手机方向，但将屏幕方向保持为纵向。所以无论用户将手机切换为横向还是纵向， View 都保持不变，但我可以得到它是横向还是纵向。

将 Activity 设置为 android:screenOrientation="portrait" 将解决这两个问题，但我无法通过

检测手机方向

public void onConfigurationChanged(Configuration newConfig) {
    switch (newConfig.orientation) {
    case Configuration.ORIENTATION_PORTRAIT:
        Toast.makeText(this, "Portrait", Toast.LENGTH_SHORT).show();
        break;
    case Configuration.ORIENTATION_LANDSCAPE:
        Toast.makeText(this, "Landscape", Toast.LENGTH_SHORT).show();
        break;
    default:
        break;
    }
}

有人知道如何解决这个问题吗？

Answer 1

这是一个用于轻松管理屏幕方向更改的多功能类:

public class OrientationManager extends OrientationEventListener {

    public enum ScreenOrientation {
        REVERSED_LANDSCAPE, LANDSCAPE, PORTRAIT, REVERSED_PORTRAIT
    }

    public ScreenOrientation screenOrientation; 
    private OrientationListener listener;

    public OrientationManager(Context context, int rate, OrientationListener listener) {
        super(context, rate);
        setListener(listener);
    }

    public OrientationManager(Context context, int rate) {
        super(context, rate);
    }

    public OrientationManager(Context context) {
        super(context);
    }

    @Override
    public void onOrientationChanged(int orientation) {
        if (orientation == -1){
            return;
        }
        ScreenOrientation newOrientation;
        if (orientation >= 60 && orientation <= 140){
            newOrientation = ScreenOrientation.REVERSED_LANDSCAPE;
        } else if (orientation >= 140 && orientation <= 220) {
            newOrientation = ScreenOrientation.REVERSED_PORTRAIT;
        } else if (orientation >= 220 && orientation <= 300) {
            newOrientation = ScreenOrientation.LANDSCAPE;
        } else {
            newOrientation = ScreenOrientation.PORTRAIT;                    
        }
        if(newOrientation != screenOrientation){
            screenOrientation = newOrientation;
            if(listener != null){
                listener.onOrientationChange(screenOrientation);
            }           
        }
    }

    public void setListener(OrientationListener listener){
        this.listener = listener;
    }

    public ScreenOrientation getScreenOrientation(){
        return screenOrientation;
    }

    public interface OrientationListener {

        public void onOrientationChange(ScreenOrientation screenOrientation);
    }
}

这样更简单、可重复使用，您还可以获得 REVERSE_LANDSCAPE 和 REVERSE_PORTRAIT 方向。

您必须实现 OrientationListener 才能仅在方向更改发生时收到通知。

不要忘记调用orientationManager.enable()开始方向跟踪，然后调用orientationManager.disable()(这两个方法继承自OrientationEventListener类)

更新:用例示例

MyFragment extends Fragment implements OrientationListener {

    ...

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        orientationManager = new OrientationManager(getActivity(), SensorManager.SENSOR_DELAY_NORMAL, this);
        orientationManager.enable();        
    }

    @Override
    public void onOrientationChange(ScreenOrientation screenOrientation) {
        switch(screenOrientation){
            case PORTRAIT:
            case REVERSED_PORTRAIT:
                MainActivityBase.getInstance().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            break;
            case REVERSED_LANDSCAPE:
                MainActivityBase.getInstance().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
            break;
            case LANDSCAPE:
                MainActivityBase.getInstance().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            break;
        }
    }
}