编写温湿度计的原理很简单,就是获取温度,湿度传感器的数据,和其它的传感器的使用方法是一样的(前提是手机要有温度,湿度传感器)
首先是获取传感器管理器:
(SensorManager) getSystemService(Context.SENSOR_SERVICE);可以通过下面这段代码查看手机上有哪些传感器:
List<Sensor> deviceSensors = mSensorManager.getSensorList(Sensor.TYPE_ALL);
for (Sensor sensor : deviceSensors) {
Log.i("sensor", "------------------");
Log.i("sensor", sensor.getName());
Log.i("sensor", sensor.getVendor());
Log.i("sensor", Integer.toString(sensor.getType()));
Log.i("sensor", "------------------");
} 接下来就是获取温度传感器和湿度传感器:
mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE); //温度传感器
mSensorManager.getDefaultSensor(Sensor.TYPE_RELATIVE_HUMIDITY); //湿度传感器给传感器注册一个事件监听器,监听传感器数据的变化:
this.tempListener = new TempListener(); this.humidityListener = new HumidityListener(); mSensorManager.registerListener(tempListener, temperature, SensorManager.SENSOR_DELAY_NORMAL); mSensorManager.registerListener(humidityListener, humidity, SensorManager.SENSOR_DELAY_NORMAL);监听器也很简单,只需实现两个方法即可:
private class TempListener implements SensorEventListener {
@Override
public final void onSensorChanged(SensorEvent event) {
float temperatureValue = event.values[0];
BigDecimal bd = new BigDecimal(temperatureValue);
double temperature = bd.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
// Log.i("Sensor", "sensor changed==>" + millibars_of_pressure);
TextView tem = (TextView)MainActivity.this.findViewById(R.id.temperature);
tem.setText(temperature + "℃");
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
Log.i("Sensor", "onAccuracyChanged");
}
} onSensorChanged方法是传感器数据变化时触发,onAccuracyChanged方法是传感器精度发生变化时触发,这个这里暂时不做什么处理,随它去变吧...
结束时,不要忘了注销监听器:
@Override
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this.tempListener);
mSensorManager.unregisterListener(this.humidityListener);
// Log.i("Sensor", "sensor pause");
}package org.lhc.thermometer;
import java.math.BigDecimal;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.KeyEvent;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
private SensorManager mSensorManager;
private Sensor temperature;
private Sensor humidity;
private SensorEventListener tempListener;
private SensorEventListener humidityListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onResume() {
super.onResume();
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
// List<Sensor> deviceSensors = mSensorManager.getSensorList(Sensor.TYPE_ALL);
// for (Sensor sensor : deviceSensors) {
// Log.i("sensor", "------------------");
// Log.i("sensor", sensor.getName());
// Log.i("sensor", sensor.getVendor());
// Log.i("sensor", Integer.toString(sensor.getType()));
// Log.i("sensor", "------------------");
// }
temperature = mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
humidity = mSensorManager.getDefaultSensor(Sensor.TYPE_RELATIVE_HUMIDITY);
this.tempListener = new TempListener();
this.humidityListener = new HumidityListener();
mSensorManager.registerListener(tempListener, temperature, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(humidityListener, humidity, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
this.onPause();
// Log.i("Sensor", "exit");
this.finish();
System.exit(0);
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this.tempListener);
mSensorManager.unregisterListener(this.humidityListener);
// Log.i("Sensor", "sensor pause");
}
private class TempListener implements SensorEventListener {
@Override
public final void onSensorChanged(SensorEvent event) {
float temperatureValue = event.values[0]; // 利用这些数据执行一些工作
BigDecimal bd = new BigDecimal(temperatureValue);
double temperature = bd.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
// Log.i("Sensor", "sensor changed==>" + millibars_of_pressure);
TextView tem = (TextView)MainActivity.this.findViewById(R.id.temperature);
tem.setText(temperature + "℃");
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// Log.i("Sensor", "onAccuracyChanged");
}
}
private class HumidityListener implements SensorEventListener {
@Override
public final void onSensorChanged(SensorEvent event) {
float humidityValue = event.values[0]; // 利用这些数据执行一些工作
BigDecimal bd = new BigDecimal(humidityValue);
double humidity = bd.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
// Log.i("Sensor", "sensor changed==>" + millibars_of_pressure);
TextView tem = (TextView)MainActivity.this.findViewById(R.id.humidity);
tem.setText(humidity + "%");
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// Log.i("Sensor", "onAccuracyChanged");
}
}
}
http://blog.csdn.net/redstarofsleep
使用android传感器自己编写温度计,湿度计 支持android5.0
原文地址：http://blog.csdn.net/redstarofsleep/article/details/45534715
