傳感器 學習筆記

package com.tang.sensor;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.os.Build;

public class MainActivity extends Activity {
	private Mylister listener;
	private SensorManager sm;
	private ImageView iv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		iv = (ImageView) findViewById(R.id.iv);
		sm = (SensorManager) getSystemService(SENSOR_SERVICE);
		Sensor ss = sm.getDefaultSensor(Sensor.TYPE_ORIENTATION);//方向傳感器
		listener = new Mylister();
		sm.registerListener(listener, ss, SensorManager.SENSOR_DELAY_UI);
	}
	
	private class Mylister implements SensorEventListener
	{
		//精度改變
		public void onAccuracyChanged(Sensor sensor, int accuracy) {
				
		}

		//傳感器數據變化時
		public void onSensorChanged(SensorEvent event) {
			float[] values = event.values;
			float angle = values[0]; 
			System.out.println(angle);
			//能夠旋轉指南針圖片
			RotateAnimation ra = new RotateAnimation(0, angle, 
					Animation.RELATIVE_TO_SELF, 0.5f, 
					Animation.RELATIVE_TO_SELF, 0.5f);
			ra.setDuration(100);
			iv.startAnimation(ra);
		}
		
	}

	@Override
	protected void onDestroy() {
		sm.unregisterListener(listener);
		listener = null;
		super.onDestroy();
	}
}