在安卓中使用加速度传感器

1.MainActivity.java

package com.sensor.guoxing.sensor;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements SensorEventListener {
    private TextView tvAccelerometer;
    private SensorManager mSensorManager;
    private float[] gravity = new float[3];
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvAccelerometer = (TextView) findViewById(R.id.tv_accelerometer);
        //获取传感器SensorManager对象
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    }
    /**
     * 传感器精度变化时回调
     */
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
    /**
     * 传感器数据变化时回调
     */
    @Override
    public void onSensorChanged(SensorEvent event) {
        //判断传感器类别
        switch (event.sensor.getType()) {
            case Sensor.TYPE_ACCELEROMETER: //加速度传感器
                final float alpha = (float) 0.8;
                gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
                gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
                gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

                String accelerometer = "加速度传感器\n" + "x:"
                        + (event.values[0] - gravity[0]) + "\n" + "y:"
                        + (event.values[1] - gravity[1]) + "\n" + "z:"
                        + (event.values[2] - gravity[2]);
                tvAccelerometer.setText(accelerometer);
                //重力加速度9.81m/s^2，只受到重力作用的情况下，自由下落的加速度
                break;
            case Sensor.TYPE_GRAVITY://重力传感器
                gravity[0] = event.values[0];//单位m/s^2
                gravity[1] = event.values[1];
                gravity[2] = event.values[2];
                break;
            default:
                break;
        }
    }
    /**
     * 界面获取焦点，按钮可以点击时回调
     */
    protected void onResume() {
        super.onResume();
        //注册加速度传感器
        mSensorManager.registerListener(this,
                mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),//传感器TYPE类型
                SensorManager.SENSOR_DELAY_UI);//采集频率
        //注册重力传感器
        mSensorManager.registerListener(this,
                mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY),
                SensorManager.SENSOR_DELAY_FASTEST);
    }
    /**
     * 暂停Activity，界面获取焦点，按钮可以点击时回调
     */
    @Override
    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(this);
    }

}

2.activity_main.xml