Android Deep Analytic Light sensor (ii)

Light Sensor Demo 1

Having told a whole bunch of theories, the following example shows the use of a light sensor. Why fully show the usage of light sense, I This example is very easy to write, just write the use of light sense necessary code, and then use a few TextView to display the value of light changes to the user interface. Allows the user to see changes in luminosity at any time.

Below are Activity 's Code :

Java code:

2. public class Lightdemoactivity extends Activity implements sensoreventlistener{
   
4. /** called when the activity is first created. */
   
6. Sensormanager Sensormanager = null;//Sensor Manager Reference
   
8. Sensor Lightsensor = null;//Light sensor reference
   
10. 
    
12. References to individual text
    
14. TextView accuracy_view= null;
    
16. TextView value_0 = null;
    
18. TextView value_1 = null;
    
20. TextView value_2 = null;
    
22. 
    
24. @Override
    
26. public void OnCreate (Bundle savedinstancestate) {
    
28. Super.oncreate (savedinstancestate);
    
30. Setcontentview (R.layout.main);
    
32. 
    
34. Get the Sensor Manager instance
    
36. Sensormanager = (Sensormanager) getsystemservice (Context.sensor_service);
    
38. Obtaining an instance of a light sensor
    
40. Lightsensor = Sensormanager.getdefaultsensor (sensor.type_light);
    
42. Get each TextView
    
44. Accuracy_view = (TextView) Findviewbyid (r.id.accuracy);
    
46. Value_0 = (TextView) Findviewbyid (R.ID.VALUE_0);
    
48. Value_1 = (TextView) Findviewbyid (r.id.value_1);
    
50. value_2 = (TextView) Findviewbyid (r.id.value_2);
    
52. }
    
54. 
    
56. @Override
    
58. protected void OnPause () {
    
60. TODO auto-generated Method Stub
    
62. Super.onpause ();
    
64. Cancellation
    
66. Sensormanager.unregisterlistener (this, lightsensor);
    
68. }
    
70. 
    
72. @Override
    
74. protected void Onresume () {
    
76. TODO auto-generated Method Stub
    
78. Super.onresume ();
    
80. Monitor the Sensor Manager register
    
82. Sensormanager.registerlistener (This,lightsensor, sensormanager.sensor_delay_normal);
    
84. }
    
86. 
    
88. @Override
    
90. public void onaccuracychanged (sensor sensor, int accuracy) {
    
92. TODO auto-generated Method Stub
    
94. if (sensor.gettype () = = Sensor.type_light) {
    
96. Set the value of accuracy to be displayed on the screen
    
98. Accuracy_view.settext ("Accuracy:" +accuracy);
    
100. }
     
102. 
     
104. }
     
106. 
     
108. @Override
     
110. public void Onsensorchanged (Sensorevent event) {
     
112. TODO auto-generated Method Stub
     
114. if (event.sensor.getType () = = Sensor.type_light) {
     
116. 
     
118. Display values to the screen
     
120. Float[] values = event.values;
     
122. Value_0.settext ("value[0]:" +values[0]);
     
124. Value_1.settext ("value[1]:" +values[1]);
     
126. Value_2.settext ("value[2]:" +values[2]);
     
128. }
     
130. }
     
132. 
     
134. }

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Let's take a look at the explanatory code:

Java code:

2. The following explanation code:
   
4. Get the Sensor Manager instance
   
6. Sensormanager = (Sensormanager) getsystemservice (Context.sensor_service);
   
8. Obtaining an instance of a light sensor
   
10. Lightsensor = Sensormanager.getdefaultsensor (sensor.type_light);
    
12. 
    
14. The purpose of this code is to obtain the Sensor Manager reference and obtain the light sensor application.
    
16. protected void Onresume () {
    
18. TODO auto-generated Method Stub
    
20. Super.onresume ();
    
22. Monitor the Sensor Manager register
    
24. Sensormanager
    
26. . Registerlistener (This,lightsensor, sensormanager.sensor_delay_normal);
    
28. }
    
30. The role of this code in the resume when the registration of monitoring, to open the light sense
    
32. protected void OnPause () {
    
34. TODO auto-generated Method Stub
    
36. Super.onpause ();
    
38. Cancellation
    
40. Sensormanager.unregisterlistener (this, lightsensor);
    
42. }
    
44. The purpose of this code is to log off the monitor when paused and turn off the light sense. Because the sensor consumes electricity, it should be shut down when not in use.
    
46. if (event.sensor.getType () = = Sensor.type_light)
    
48. {
    
50. Display values to the screen
    
52. Float[] values = event.values;
    
54. Value_0.settext ("value[0]:" +values[0]);
    
56. Value_1.settext ("value[1]:" +values[1]);
    
58. Value_2.settext ("value[2]:" +values[2]);
    
60. }
    
62. 
    
64. }

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Android Deep Analytic Light sensor (ii)