Android开发--传感器介绍

获取手机中的传感器的步骤为：

获取SensorManager对象
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
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;
}

}