Android compass的简单代码不起作用。如何修复它?
我用这个例子编写了应用程序 但它不起作用。如果我旋转手机,图像就会抖动 我使用索尼M2(安卓4.4.4)Android compass的简单代码不起作用。如何修复它?,android,geolocation,android-4.4-kitkat,compass,Android,Geolocation,Android 4.4 Kitkat,Compass,我用这个例子编写了应用程序 但它不起作用。如果我旋转手机,图像就会抖动 我使用索尼M2(安卓4.4.4) 如何写简单的指南针 你可以试试我的CompassAssistant课程。它应该完全满足您的要求: 如果你想自己尝试,我给你举个例子: 让您的活动实现SensorEventListener并添加必要的字段: public class CompassActivity extends Activity implements SensorEventListener { private
如何写简单的指南针 你可以试试我的CompassAssistant课程。它应该完全满足您的要求: 如果你想自己尝试,我给你举个例子: 让您的活动实现SensorEventListener并添加必要的字段:
public class CompassActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private Sensor accelerometer;
private Sensor magnetometer;
private float[] lastAccelerometer = new float[3];
private float[] lastMagnetometer = new float[3];
private boolean lastAccelerometerSet = false;
private boolean lastMagnetometerSet = false;
private float[] rotationMatrix = new float[9];
private float[] orientation = new float[3];
在活动的onCreate方法中,获取并启动两个传感器,即加速计和磁强计:
// onCreate method stub ...
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_UI);
sensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_UI);
// more onCreate method stub ....
使用SensorEventListener的方法,您现在可以计算手机的航向,并计算当前位置与其他位置之间的方位:
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor == this.accelerometer) {
System.arraycopy(event.values, 0, this.lastAccelerometer, 0, event.values.length);
this.lastAccelerometerSet = true;
} else if (event.sensor == this.magnetometer) {
System.arraycopy(event.values, 0, this.lastMagnetometer, 0, event.values.length);
this.lastMagnetometerSet = true;
}
if (this.lastAccelerometerSet && this.lastAccelerometerSet) {
SensorManager.getRotationMatrix(this.rotationMatrix,null, this.lastAccelerometer, this.lastMagnetometer);
SensorManager.getOrientation(this.rotationMatrix, this.orientation);
float azimuthInRadiands = this.orientation[0];
// this is now the heading of the phone. If you want
// to rotate a view to north don´t forget that you have
// to rotate by the negative value.
float azimuthInDegrees = (float) Math.toDegrees(azimuthInRadiands);
}
}
但别忘了指南针背后还有很多东西。如果磁场传感器未校准,则必须向用户显示。你必须计算出磁力线和地理位置之间的差异
在我的助手看来,这一切都是可以考虑的