我正在开发罗盘应用程序,我希望指南针指向特定的纬度经度位置,而不是通常的北方.我发现有一些

questions与我的问题有关,但我没有办法让他们为我工作.这是我的代码：

public class MainActivity extends AppCompatActivity implements SensorEventListener {

private ImageView image;

private float currentDegree = 0f;

private SensorManager mSensorManager;

private TextView tvHeading;

private Location location = new Location("A");

private Location target = new Location("B");

private LocationManager locationManager;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

image = (ImageView) findViewById(R.id.imageViewCompass);

tvHeading = (TextView) findViewById(R.id.tvHeading);

mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

location.setLatitude(54.903535);

location.setLongitude(23.979342);

target.setLatitude(54.904618);

target.setLongitude(23.978782);

}

@Override

protected void onResume() {

super.onResume();

mSensorManager.registerListener(this,mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),SensorManager.SENSOR_DELAY_GAME);

}

@Override

protected void onPause() {

super.onPause();

mSensorManager.unregisterListener(this); // to stop the listener and save battery

}

@Override

public void onSensorChanged(SensorEvent event) {

float degree = Math.round(event.values[0]);

tvHeading.setText("Heading: " + Float.toString(degree) + " degrees");

RotateAnimation ra = new RotateAnimation(

currentDegree,-degree,Animation.RELATIVE_TO_SELF,0.5f,0.5f);

ra.setDuration(210);

ra.setFillAfter(true);

image.startAnimation(ra);

currentDegree = -degree;

}

@Override

public void onAccuracyChanged(Sensor sensor,int accuracy) {

// not in use

}

}

目前我的指针只显示在北方,而不是我的编码目标位置.