Android编程实现的重力感应示例代码

package com.learn.sunboy;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.Toast;
public class TestSensor extends Activity{
  private SensorManager mSensorManager = null;
  private Sensor mSensor = null;
  private float x, y, z;
  @Override
  protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    mSensorManager = (SensorManager)this.getSystemService(SENSOR_SERVICE);
    mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
  }
  SensorEventListener lsn = new SensorEventListener() {
    @Override
    public void onSensorChanged(SensorEvent event) {
      x = event.values[SensorManager.DATA_X];
      y = event.values[SensorManager.DATA_Y];
      z = event.values[SensorManager.DATA_Z];
    }
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
      // TODO Auto-generated method stub
    }
  };
  @Override
  public boolean onTouchEvent(MotionEvent event){
    if(event.getAction() == MotionEvent.ACTION_DOWN){
      mSensorManager.registerListener(lsn, mSensor, SensorManager.SENSOR_DELAY_GAME);
      String str = "x=" + x + "; y=" + y + "; z=" + z; 
      Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show();
    }
    return super.onTouchEvent(event);
  }
  @Override
  public void onResume(){
    mSensorManager.registerListener(lsn, mSensor, SensorManager.SENSOR_DELAY_GAME);
    super.onResume();
  }
  @Override
  public void onPause(){
    mSensorManager.unregisterListener(lsn);
    super.onPause();
  }
}