Android开发--传感器介绍

获取手机中的传感器的步骤为：

1. 获取SensorManager对象
2. 执行SensorManager对象的getDefaultSensor()方法获取Sensor对象，这里getDefaultSensor()方法要传递一个参数，指定具体的传感器类型
3. 获取Sensor对象中的各种属性

下面给出获取手机内传感器的实现代码：

	Log.d("BruceZhang", "以下是你的手机里的传感器：");
				List<Sensor> sensors=sensorManager.getSensorList(Sensor.TYPE_ALL);
				Log.d("BruceZhang", "--->");
				for(Sensor sensor: sensors){
					Log.d("BruceZhang", sensor.getName());
				}
				//通过使用getDefaultSensor方法获得一个特定的传感器
//				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);

在知道怎么获取传感器之后，我们需要使用程序获取传感器的值，下面给出实例代码：

		SensorManager sensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
				
				sensorManager.registerListener(new SensorEventListener() {
					
					/*
					 * SensorEvent event
					 * 一旦传感器感知外界条件发生变化，就会把相应的数据传递给这个对象
					 * 一般会把这个方法放在onCreate里，不用手动的去获取
					 */
					@Override
					public void onSensorChanged(SensorEvent event) {
						// TODO Auto-generated method stub
						float auc=event.accuracy;
						//这里的第一个元素代表的是光线的强度
						float lux=event.values[0];
						Log.d("BruceZhang", auc+"");
						Log.d("BruceZhang", lux+"");
						
					}
					
					@Override
					public void onAccuracyChanged(Sensor sensor, int accuracy) {
						// TODO Auto-generated method stub
						
					}
				}, sensor, SensorManager.SENSOR_DELAY_NORMAL);
				//SensorManager.SENSOR_DELAY_NORMAL
				//这个参数就是设置传感器的采样率
			}

传感器有一系列的属性：

1、传感器的采样率
a) SENSOR_DELAY_NOMAL (200000微秒)
b) SENSOR_DELAY_UI (60000微秒)
c) SENSOR_DELAY_GAME (20000微秒)
d) SENSOR_DELAY_FASTEST (0微秒)

2、传感器的属性
a) 传感器的名称
b) 传感器制造商
c) 传感器功率
d) 传感器的resulotion

获取这些属性的方法也很简单，代码如下：

SensorManager sensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
				
				sensorManager.registerListener(new SensorEventListener() {
					
					@Override
					public void onSensorChanged(SensorEvent event) {
						// TODO Auto-generated method stub
						
						//传感器的名字
						String sensorName=event.sensor.getName();
						//传感器制造商的名字
						String sensorVendor=event.sensor.getVendor();
						//传感器的分辨率，传感器所能识别的最小的精度是多少
						float sensorRevolution=event.sensor.getResolution();
						//传感器的功率
						float sensorPower=event.sensor.getPower();
						//传感器取得数据的时间是多少
						double timeStamp=event.timestamp;
						
						//打印数据
						Log.d("BruceZhang", sensorName+"");
						Log.d("BruceZhang", sensorVendor+"");
						Log.d("BruceZhang", sensorRevolution+"");
						Log.d("BruceZhang", sensorPower+"");
						Log.d("BruceZhang", timeStamp+"");
					}
					
					@Override
					public void onAccuracyChanged(Sensor sensor, int accuracy) {
						// TODO Auto-generated method stub
						
					}
				}, sensor, SensorManager.SENSOR_DELAY_NORMAL);
		
			}

下面实现的这个实例实现了上述内容的综合：

实例的完整代码如下：

/*
 * 传感器会通过传感器事件把值传给用户
 * 所以，我们的应用程序是被动的，等待传感器把数据传递给SensorEvent对象
 */
public class MainActivity extends Activity {
	private Button button;
	private Button button2;
	private Button button3;
	private SensorManager sensorManager;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//得到SensorManager对象
		sensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
		
		button=(Button)findViewById(R.id.sensorButton);
		button2=(Button)findViewById(R.id.lightButton);
		button3=(Button)findViewById(R.id.lightButton2);
		
		button3.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				SensorManager sensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
				
				sensorManager.registerListener(new SensorEventListener() {
					
					@Override
					public void onSensorChanged(SensorEvent event) {
						// TODO Auto-generated method stub
						
						//传感器的名字
						String sensorName=event.sensor.getName();
						//传感器制造商的名字
						String sensorVendor=event.sensor.getVendor();
						//传感器的分辨率，传感器所能识别的最小的精度是多少
						float sensorRevolution=event.sensor.getResolution();
						//传感器的功率
						float sensorPower=event.sensor.getPower();
						//传感器取得数据的时间是多少
						double timeStamp=event.timestamp;
						
						//打印数据
						Log.d("BruceZhang", sensorName+"");
						Log.d("BruceZhang", sensorVendor+"");
						Log.d("BruceZhang", sensorRevolution+"");
						Log.d("BruceZhang", sensorPower+"");
						Log.d("BruceZhang", timeStamp+"");
					}
					
					@Override
					public void onAccuracyChanged(Sensor sensor, int accuracy) {
						// TODO Auto-generated method stub
						
					}
				}, sensor, SensorManager.SENSOR_DELAY_NORMAL);
		
			}
			
		});
		
		button2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				SensorManager sensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
				
				sensorManager.registerListener(new SensorEventListener() {
					
					/*
					 * SensorEvent event
					 * 一旦传感器感知外界条件发生变化，就会把相应的数据传递给这个对象
					 * 一般会把这个方法放在onCreate里，不用手动的去获取
					 */
					@Override
					public void onSensorChanged(SensorEvent event) {
						// TODO Auto-generated method stub
						float auc=event.accuracy;
						//这里的第一个元素代表的是光线的强度
						float lux=event.values[0];
						Log.d("BruceZhang", auc+"");
						Log.d("BruceZhang", lux+"");
						
					}
					
					@Override
					public void onAccuracyChanged(Sensor sensor, int accuracy) {
						// TODO Auto-generated method stub
						
					}
				}, sensor, SensorManager.SENSOR_DELAY_NORMAL);
				//SensorManager.SENSOR_DELAY_NORMAL
				//这个参数就是设置传感器的采样率
			}
		});
		
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Log.d("BruceZhang", "以下是你的手机里的传感器：");
				List<Sensor> sensors=sensorManager.getSensorList(Sensor.TYPE_ALL);
				Log.d("BruceZhang", "--->");
				for(Sensor sensor: sensors){
					Log.d("BruceZhang", sensor.getName());
				}
				//通过使用getDefaultSensor方法获得一个特定的传感器
//				Sensor sensor=sensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
			}
		});
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}