看看你的android设备里有多少传感器？

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.tv);

StringBuilder sb = new StringBuilder();

SensorManager sm = (SensorManager) getSystemService(SENSOR_SERVICE);
List<Sensor> sensorList = sm.getSensorList(Sensor.TYPE_ALL);
Log.i("WYL", "传感器总数："+sensorList.size());
sb.append("传感器总数："+sensorList.size()+"\n\n\n");

for (int i = 0; i < sensorList.size(); i++) {
Sensor sensor = sensorList.get(i);
String sensorName = sensor.getName();
Log.i("WYL",(i+1)+ "："+sensorName);
sb.append((i+1)+": "+sensorName+"\n");
}
tv.setText(sb.toString());
}
}