加速度传感器的简单使用
使用要点:
1.创建一个内部类实现SensorEventListener(或者在本类直接实现)。
//创建内部类AccelerSensor,实现SensorEventListener
class AccelerSensor implements SensorEventListener{
@Override
public void onSensorChanged(SensorEvent event) {
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
2.获得传感器的对象,并创建内部类AccelerSensor的实例。
//获得传感器的对象
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
//创建AccelerSensor对象
accelerSensor = new AccelerSensor();
3.在onResume()方法中注册传感器管理。
//注册传感器管理
sensorManager.registerListener(accelerSensor,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
sensorManager.SENSOR_DELAY_UI);
4.在onPause()方法中注销传感器管理。
sensorManager.unregisterListener(accelerSensor);
5.编写加速度改变事件。
@Override
public void onSensorChanged(SensorEvent event) {
float[] acceler = new float[3];
for (int i = 0; i < acceler.length; i++) {
acceler[i] = event.values[i];
}
textView.setText("x = "+acceler[0]+" ,y = "+acceler[1]+" ,z = "+acceler[2]);
}
下面贴出使用源码:
(1)MainActivity.java文件
package com.example.accelerationsensor;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private SensorManager sensorManager;
private AccelerSensor accelerSensor;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获得传感器的对象
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
//创建AccelerSensor对象
accelerSensor = new AccelerSensor();
textView=findViewById(R.id.tv_accelerometer);
}
@Override
protected void onResume() {
super.onResume();
//注册传感器管理
if(sensorManager != null){
sensorManager.registerListener(accelerSensor,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
sensorManager.SENSOR_DELAY_UI);
}
}
@Override
protected void onPause() {
super.onPause();
//注销传感器管理
if(sensorManager != null){
sensorManager.unregisterListener(accelerSensor);
}
}
//创建内部类AccelerSensor,实现SensorEventListener
class AccelerSensor implements SensorEventListener{
@Override
public void onSensorChanged(SensorEvent event) {
float[] acceler = new float[3];
for (int i = 0; i < acceler.length; i++) {
acceler[i] = event.values[i];
}
textView.setText("x = "+acceler[0]+" ,y = "+acceler[1]+" ,z = "+acceler[2]);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
}
(1)activity_main.xml文件
<?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/tv_accelerometer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="null"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>