详解 android 光线传感器 light sensor的使用

调用anroid的光线传感器使用。

实现效果图：

mainactivity.java

package hk.ust.cse.comp107x.ligthsensor; 
 
import android.content.context; 
import android.hardware.sensor; 
import android.hardware.sensorevent; 
import android.hardware.sensoreventlistener; 
import android.hardware.sensormanager; 
import android.support.v7.app.appcompatactivity; 
import android.os.bundle; 
import android.widget.textview; 
 
public class mainactivity extends appcompatactivity implements sensoreventlistener{ 
  private sensormanager msensormanager; 
  private sensor mpressure; 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
    // get an instance of the sensor service, and use that to get an instance of 
    // a particular sensor. 
    msensormanager = (sensormanager) getsystemservice(context.sensor_service); 
    mpressure = msensormanager.getdefaultsensor(sensor.type_light); 
  } 
  @override 
  public final void onaccuracychanged(sensor sensor, int accuracy) { 
    // do something here if sensor accuracy changes. 
  } 
  @override 
  public final void onsensorchanged(sensorevent event) { 
    float light = event.values[0]; 
    textview v = (textview)findviewbyid(r.id.textview); 
    v.settext(float.tostring(light)); 
    // do something with this sensor data. 
  } 
  @override 
  protected void onresume() { 
    // register a listener for the sensor. 
    super.onresume(); 
    msensormanager.registerlistener(this, mpressure, sensormanager.sensor_delay_normal); 
  } 
 
  @override 
  protected void onpause() { 
    // be sure to unregister the sensor when the activity pauses. 
    super.onpause(); 
    msensormanager.unregisterlistener(this); 
  } 
} 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:paddingbottom="@dimen/activity_vertical_margin" 
  android:paddingleft="@dimen/activity_horizontal_margin" 
  android:paddingright="@dimen/activity_horizontal_margin" 
  android:paddingtop="@dimen/activity_vertical_margin" 
  tools:context="hk.ust.cse.comp107x.ligthsensor.mainactivity"> 
 
  <textview 
    android:id="@+id/textview" 
    android:textsize="50dp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="hello world!" 
    android:layout_alignparenttop="true" 
    android:layout_centerhorizontal="true" 
    android:layout_margintop="177dp" /> 
</relativelayout> 

androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
  package="hk.ust.cse.comp107x.ligthsensor"> 
 
  <application 
    android:allowbackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsrtl="true" 
    android:theme="@style/apptheme"> 
    <activity android:name=".mainactivity"> 
      <intent-filter> 
        <action android:name="android.intent.action.main" /> 
 
        <category android:name="android.intent.category.launcher" /> 
      </intent-filter> 
    </activity> 
  </application> 
 
</manifest> 

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！