安卓传感器开发之指南针

代码很简单，主要是一些常用传感器的监听，指南针还是挺好用的。

布局代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:background="#fff"
	>
<ImageView
	android:id="@+id/znzImage"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:scaleType="fitCenter"
	android:src="@drawable/compass" />
</LinearLayout>

程序代码：

package zhinanzheng.com;

import android.app.Activity;
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;
/**
 * @author coderwry 653866417@qq.com
 * @version  1.0
 */
public class Zhinanzheng extends Activity implements SensorEventListener{
	
	ImageView image;  //指南针图片
	float currentDegree = 0f; //指南针图片转过的角度
	
	SensorManager mSensorManager; //管理器
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        image = (ImageView)findViewById(R.id.znzImage);
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); //获取管理服务
    }
    
    @Override 
    protected void onResume(){
    	super.onResume();
    	//注册监听器
    	mSensorManager.registerListener(this
    			, mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_GAME);
    }
    
    //取消注册
    @Override
    protected void onPause(){
    	mSensorManager.unregisterListener(this);
    	super.onPause();
    	
    }
    
    @Override
    protected void onStop(){
    	mSensorManager.unregisterListener(this);
    	super.onStop();
    	
    }

    //传感器值改变
	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// TODO Auto-generated method stub
		
		
	}
    //精度改变
	@Override
	public void onSensorChanged(SensorEvent event) {
		// TODO Auto-generated method stub
		//获取触发event的传感器类型
		int sensorType = event.sensor.getType();
		
		switch(sensorType){
		case Sensor.TYPE_ORIENTATION:
			float degree = event.values[0]; //获取z转过的角度
			//穿件旋转动画
			RotateAnimation ra = new RotateAnimation(currentDegree,-degree,Animation.RELATIVE_TO_SELF,0.5f
					,Animation.RELATIVE_TO_SELF,0.5f);
		 ra.setDuration(100);//动画持续时间
		 image.startAnimation(ra);
		 currentDegree = -degree;
		 break;
		
		}
	}
}

效果图