使用android传感器自己编写温度计,湿度计支持android5.0

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 + "℃");  }@Overridepublic 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:

@Overrideprotected void onPause() {super.onPause();    mSensorManager.unregisterListener(this.tempListener);    mSensorManager.unregisterListener(this.humidityListener);    //    Log.i("Sensor", "sensor pause");}

最后附上整个activity代码:

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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overrideprotected 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);}@Overridepublic 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);}@Overrideprotected 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 + "℃");  }@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {//Log.i("Sensor", "onAccuracyChanged");}}private class HumidityListener implements SensorEventListener {@Overridepublic 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 + "%");}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {//Log.i("Sensor", "onAccuracyChanged");}}}

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http://blog.csdn.net/redstarofsleep

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