package com.hb.direction;
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 SensorManager sm;
private ImageView iv_compress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv_compress=(ImageView) findViewById(R.id.iv_compass);
sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
//地磁场
Sensor magnetic = sm.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
//加速度
Sensor acceleromter = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sm.registerListener(listener, magnetic, SensorManager.SENSOR_DELAY_GAME);
sm.registerListener(listener, acceleromter, SensorManager.SENSOR_DELAY_GAME);
}
@Override
protected void onDestroy() {
super.onDestroy();
if( sm!=null){
sm.unregisterListener(listener);
}
}
private SensorEventListener listener=new SensorEventListener() {
float[] magneticValues=new float[3];
float[] acceleromterValues=new float[3];
private float lastRotateDegree;
@Override
public void onSensorChanged(SensorEvent event) {
//判断当前是加速度还是地磁场传感器
if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){
acceleromterValues=event.values.clone();
}else if(event.sensor.getType()==Sensor.TYPE_MAGNETIC_FIELD){
magneticValues=event.values.clone();
}
float [] R=new float[9];
float [] values=new float[3];
SensorManager.getRotationMatrix(R, null, acceleromterValues, magneticValues);
SensorManager.getOrientation(R, values);
//toDegreess转化为度
// tv_direction.setText("values is"+Math.toDegrees(values[0]));
// Toast.makeText(MainActivity.this, "values is"+Math.toDegrees(values[0]), 0).show();
//将计算出的旋转角取反用于指南针背景图
float roteteDegree=-(float)Math.toDegrees(values[0]);
if((Math.abs(roteteDegree)-lastRotateDegree)>1){
RotateAnimation animation = new RotateAnimation(lastRotateDegree, roteteDegree,Animation.RELATIVE_TO_SELF,
0.5f,Animation.RELATIVE_TO_SELF,0.5f);
animation.setFillAfter(true);
iv_compress.startAnimation(animation);
lastRotateDegree=roteteDegree;
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
};
}
1 2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_
4 android:layout_
5 tools:cOntext="${relativePackage}.${activityClass}" >
6
7 <ImageView
8 android:id="@+id/iv_arrow"
9 android:layout_
10 android:layout_
11 android:layout_centerInParent="true"
12 android:src="@drawable/arrow3" />
13
14 <ImageView
15 android:id="@+id/iv_compass"
16 android:layout_
17 android:layout_
18 android:layout_centerInParent="true"
19 android:src="@drawable/compass" />
20
21