Android:从方位角，滚动和滚动获取设备方向沥青

问题描述

我需要获取更新的设备方向，但是我必须将我的活动固定为Portrait(这是我在布局xml文件中所做的)，这使我无法使用此功能:

I need to get the updated device orientation, but I have to fix my activity to Portrait (which I did in the layout xml file), which prevents me from using this:

int rotation = getWindowManager().getDefaultDisplay().getRotation();

因为它总是使我旋转人像，

because it always gives me the portrait rotation,

所以，我试图依靠传感器.我发现不推荐使用Sensor.TYPE_ORIENTATION，因此我使用的是Sensor.TYPE_ACCELEROMETER& Sensor.TYPE_MAGNETIC_FIELD，这是事件侦听器:

So, I'm trying to rely on the sensors. I found that Sensor.TYPE_ORIENTATION is deprecated, so I'm using a combination of Sensor.TYPE_ACCELEROMETER & Sensor.TYPE_MAGNETIC_FIELD and here is the event listener:

SensorEventListener sensorEventListener = new SensorEventListener() {
    float[] mGravity;
    float[] mGeomagnetic;

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
            mGravity = event.values;
        if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
            mGeomagnetic = event.values;
        if (mGravity != null && mGeomagnetic != null) {
            float R[] = new float[9];
            float I[] = new float[9];
            boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic);
            if (success) {
                float orientationData[] = new float[3];
                SensorManager.getOrientation(R, orientationData);
                azimuth = orientationData[0];
                pitch = orientationData[1];
                roll = orientationData[2];
                // now how to use previous 3 values to calculate orientation
            }
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub

    }
};

现在问题是，如何使用3个值azimuth，pitch& roll将当前设备方向检测为以下之一:

Now Question is, how to use the 3 values azimuth, pitch & roll to detect current device orientation as one of these:

• 风景(旋转0)
• 肖像(旋转90度)
• 反向风景(旋转180度)
• 反像(旋转270度)

推荐答案

我已找到&这是在读取pitch& roll:

I've found it & here is the calculating function that will be called inside the listener after reading the pitch & roll:

public static final int ORIENTATION_PORTRAIT = 0;
public static final int ORIENTATION_LANDSCAPE_REVERSE = 1;
public static final int ORIENTATION_LANDSCAPE = 2;
public static final int ORIENTATION_PORTRAIT_REVERSE = 3;
public int orientation = ORIENTATION_PORTRAIT;

private int calculateOrientation(int roll, int pitch) {
    if (((orientation == ORIENTATION_PORTRAIT || orientation == ORIENTATION_PORTRAIT_REVERSE)
            && (roll > -30 && roll < 30))) {
        if (averagePitch > 0)
            return ORIENTATION_PORTRAIT_REVERSE;
        else
            return ORIENTATION_PORTRAIT;
    } else {
        // divides between all orientations
        if (Math.abs(pitch) >= 30) {
            if (pitch > 0)
                return ORIENTATION_PORTRAIT_REVERSE;
            else
                return ORIENTATION_PORTRAIT;
        } else {
            if (averageRoll > 0) {
                return ORIENTATION_LANDSCAPE_REVERSE;
            } else {
                return ORIENTATION_LANDSCAPE;
            }
        }
    }
}

-更新-

&这是我完整的实用程序类的实现

& here is my full utility class implementation

-更新-

添加此图像有助于可视化azimuth，pitch& roll:

Adding this image to help visualizing the azimuth, pitch & roll:

这篇关于Android:从方位角，滚动和滚动获取设备方向沥青的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！