使用android传感器自各儿编写温度计,湿度计 支持android5.0

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 + "℃");		  }		@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");	}

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;		@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");		}	}}

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