如何在android中不更新值的情况下只获取加速度计X、Y、Z值

Question

嗨，我有一个类，基本上可以在点击按钮时收集GPS数据（经度、纬度和方位）、时间（H、M和S）和加速度计数据（X、Y、Z）。到目前为止，我已经让GPS的东西工作起来了（除了轴承由于某种原因只显示0？？我需要为此设置一些特殊权限吗？？），以及点击按钮时显示的时间，但加速度计X、Y和Z不断变化，因为它们与侦听器相连。有没有像getX（）、getY（）或getZ（）这样的方法，每次点击按钮时只给我一个X、Y、Z读数，而不会改变。这是我到目前为止的代码：

package com.example.servicetest3;
import java.util.Calendar;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements SensorEventListener {
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 0; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds
protected LocationManager locationManager;    
protected Button retrieveLocationButton;
protected TextView displayView;
//accelerometer vars
Sensor accelerometer;
SensorManager sm;
TextView acceleration;
TextView time;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);
    displayView = (TextView) findViewById(R.id.displayView);
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    locationManager.requestLocationUpdates(
            LocationManager.GPS_PROVIDER, 
            MINIMUM_TIME_BETWEEN_UPDATES, 
            MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
            new MyLocationListener()
    );
    //time
    time = (TextView) findViewById(R.id.time);
    //set up Accelerometer service and its corresponding textViews
    acceleration = (TextView) findViewById(R.id.acceleration);
    sm = (SensorManager) getSystemService(SENSOR_SERVICE);
    accelerometer = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    sm.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
retrieveLocationButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            showCurrentLocation();
            int hour = Calendar.getInstance().get(Calendar.HOUR);
            int minute = Calendar.getInstance().get(Calendar.MINUTE);
            int second = Calendar.getInstance().get(Calendar.SECOND);
            time.setText(Integer.toString(hour) + " | " + Integer.toString(minute) + " | " + Integer.toString(second));
        }
});        
}    
protected void showCurrentLocation() {
    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    if (location != null) {
        String message = String.format(
                "Current Location n Longitude: %1$s n Latitude: %2$s n Bearing: %3$s",
                location.getLongitude(), location.getLatitude(), location.getBearing()
        );
        displayView.setText(message);
        //Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
    }
}   
private class MyLocationListener implements LocationListener {
    public void onLocationChanged(Location location) {
        String message = String.format(
                "New Location n Longitude: %1$s n Latitude: %2$s n Bearing: %3$s",
                location.getLongitude(), location.getLatitude(), location.getBearing()
        );
        //Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
    }
    public void onStatusChanged(String s, int i, Bundle b) {
        Toast.makeText(MainActivity.this, "Provider status changed",
                Toast.LENGTH_LONG).show();
    }
    public void onProviderDisabled(String s) {
        Toast.makeText(MainActivity.this,
                "Provider disabled by the user. GPS turned off",
                Toast.LENGTH_LONG).show();
    }
    public void onProviderEnabled(String s) {
        Toast.makeText(MainActivity.this,
                "Provider enabled by the user. GPS turned on",
                Toast.LENGTH_LONG).show();
    }
}
//accelerometer
public void onSensorChanged(SensorEvent event) {
   acceleration.setText("X: " + event.values[0] + 
                        "nY: " + event.values[1] +
                        "nZ: " + event.values[2]);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // TODO Auto-generated method stub
}
}

请尽快提供帮助！！！谢谢

Answer 1

获取值后，只需在onSensorChanged()中注销侦听器。

public void onSensorChanged(SensorEvent event) {
    acceleration.setText("X: " + event.values[0] + 
                        "nY: " + event.values[1] +
                        "nZ: " + event.values[2]);
    sm.unregisterListener(this);
}