Cordova 如何在phonegap中获得准确的方向？

我用phonegap开发了一个混合应用程序

在phonegap api和本机代码中使用compass函数

有一个问题

我的测试设备Galaxy Note 1、GalaxyS3等。。。它们不表示相同的方向

我的phonegap来源是

document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
        startWatch();
    }

function startWatch() {

        // Update compass every 3 seconds
        var options = { frequency: 1000 };

        watchID = navigator.compass.watchHeading(onSuccess, onError, options);
    }

function onSuccess(heading) {
        var element = document.getElementById('heading');
        var deg = heading.magneticHeading;
        element.innerHTML = 'Heading: ' + deg + '<br>';        
    }

float[] mGravity;
float[] mGeomagnetic;

public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
        mGravity = event.values.clone();
    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
        mGeomagnetic = event.values.clone();
    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 orientation[] = new float[3];
            SensorManager.getOrientation(R, orientation);
            azimut = (float)Math.toDegrees(orientation[0]);

            //for (-180 to 180), (-10 to 350) 
            if(azimut<0)
                azimut = azimut+360;                            Log.d("azimut",""+azimut);

            // orientation contains: azimut, pitch and roll
            Matrix matrix=new Matrix();
            imgView.setScaleType(ScaleType.MATRIX);   //required
            matrix.postRotate(360-azimut+angle, imgView.getWidth()/2,     imgView.getHeight()/2);
            imgView.setImageMatrix(matrix);

        }
    }
}

参考phonegap api

我的原始资料是

document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
        startWatch();
    }

function startWatch() {

        // Update compass every 3 seconds
        var options = { frequency: 1000 };

        watchID = navigator.compass.watchHeading(onSuccess, onError, options);
    }

function onSuccess(heading) {
        var element = document.getElementById('heading');
        var deg = heading.magneticHeading;
        element.innerHTML = 'Heading: ' + deg + '<br>';        
    }

float[] mGravity;
float[] mGeomagnetic;

public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
        mGravity = event.values.clone();
    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
        mGeomagnetic = event.values.clone();
    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 orientation[] = new float[3];
            SensorManager.getOrientation(R, orientation);
            azimut = (float)Math.toDegrees(orientation[0]);

            //for (-180 to 180), (-10 to 350) 
            if(azimut<0)
                azimut = azimut+360;                            Log.d("azimut",""+azimut);

            // orientation contains: azimut, pitch and roll
            Matrix matrix=new Matrix();
            imgView.setScaleType(ScaleType.MATRIX);   //required
            matrix.postRotate(360-azimut+angle, imgView.getWidth()/2,     imgView.getHeight()/2);
            imgView.setImageMatrix(matrix);

        }
    }
}

参考谷歌开发者

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为什么我的设备不能指示相同的方向？

考虑到你在评论中说这是你的指南针而不是你的代码，答案是重新校准你的指南针。请参阅链接说明：

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您是否在应用程序之外的设备上测试了指南针？指南针可能需要重新校准。当然可以。我下载了其他指南针应用程序。但情况是一样的。如何重新校准我的设备？我不知道。