sensor使用步骤
1.通过Context获取到SensorManager对象
2.为sensorManager注册监听器(在Activity的 onResume)
参数含义:
1.SensorEventListenner listener 监听传感器事件的监听器
2.,Sensor sensor, 传感器对象
3.int samplingPeriodUs 获取传感器数据的频率
(1)SensorManager.SENSOR_DELAY_GAME
(2)SensorManager.SENSOR_DELAY_FASTEST
(3)SensorManager.SENSOR_DELAY_UI
3.在Activity的 onPause方法取消注册
sensorManager.registerListener(this,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_GAME);
onSensorChanged方法中获得回调的数据
implements SensorEventListener的实现方法中重写onSensorChanged,
里面有三个值分别为x,y,z轴值:values[0],values[1],values[2]
java代码
package com.mt.sensor;
import android.annotation.TargetApi;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Build;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
TextView exTxt1;
SensorManager sensorManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
exTxt1= findViewById(R.id.txt1);
//1.获取系统的传感器管理服务
sensorManager= (SensorManager) getSystemService(Context.SENSOR_SERVICE);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onResume() {
super.onResume();
//2.为系统的加速度传感器注册监听事件
sensorManager.registerListener(this,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_GAME);
}
@Override
protected void onPause() {
super.onPause();
//取消注册
sensorManager.unregisterListener(this);
}
//传感器的1值发生变化回调
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
float[] values=sensorEvent.values;
String sb="x方向加速度:"+
values[0]+
"\nY轴方向加速度:"+
values[1]+
"\nZ轴方向加速度:"+
values[2];
exTxt1.setText(sb);
}
@Override
public void onAccuracyChanged(Sensor sensor, int i) {
}
}
xml代码
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/txt1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>