Android(安卓)利用方向传感器实现 指南针
16lz
2021-12-04
step1:新建一个项目Compass,并将一张指南针图片导入到res/drawable-hdpi目录中
step2:设计应用的UI界面,main.xml
<?xml version="1.0" encoding="utf-8"?>step3：MainActivity.java
import android.app.Activity;import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.os.Bundle;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.ImageView;public class MainActivity extends Activity {private ImageView imageView;/** 传感器管理器 */private SensorManager manager;private SensorListener listener = new SensorListener();@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);imageView = (ImageView) this.findViewById(R.id.imageView);imageView.setKeepScreenOn(true);//屏幕高亮//获取系统服务（SENSOR_SERVICE)返回一个SensorManager 对象manager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);}@Overrideprotected void onResume() {/** * 获取方向传感器 * 通过SensorManager对象获取相应的Sensor类型的对象 */Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION);//应用在前台时候注册监听器manager.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_GAME);super.onResume();}@Overrideprotected void onPause() {//应用不在前台时候销毁掉监听器manager.unregisterListener(listener);super.onPause();}private final class SensorListener implements SensorEventListener {private float predegree = 0;@Overridepublic void onSensorChanged(SensorEvent event) {/** * values[0]: x-axis 方向加速度 values[1]: y-axis 方向加速度 values[2]: z-axis 方向加速度 */float degree = event.values[0];// 存放了方向值/**动画效果*/RotateAnimation animation = new RotateAnimation(predegree, degree,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f);animation.setDuration(200);imageView.startAnimation(animation);predegree=-degree;/**float x=event.values[SensorManager.DATA_X];float y=event.values[SensorManager.DATA_Y];float z=event.values[SensorManager.DATA_Z];Log.i("XYZ", "x="+(int)x+",y="+(int)y+",z="+(int)z);*/}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {}}}step4:AndroidManifest.xml
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