How to enable flashlight for Android

1. Use ihardwareservice for direct control

Android1.5 previously provided this interface directly. Later, we need to do it ourselves.

Create a new Android. OS package in your project and create an ihardwareservice. aidl file. The content is as follows:

[Java]
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1. <Span style = "font-size: 18px;"> package Android. OS;
3. /** {@ Hide }*/
4. Interface ihardwareservice
5. {
6. // Obsolete flashlight support
7. Boolean getflashlightenabled ();
8. Void setflashlightenabled (Boolean on );
9. } </Span>

Then introduce

[Java]
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1. Import Android. OS. ihardwareservice;
3. /**
4. * Enable and disable the flashlight.
5. * @ Param isenable
6. * @ Author Linc
7. * @ Date 2012-3-18
8. */
9. Private void setflashlightenabled (Boolean isenable)
10. {
11. Try
12. {
13. Method method = Class. forname ("android. OS. servicemanager"). getmethod ("getservice", String. Class );
14. Ibinder binder = (ibinder) method. Invoke (null, new object [] {"hardware "});
16. Ihardwareservice localhardwareservice = ihardwareservice. stub. asinterface (binder );
17. Localhardwareservice. setflashlightenabled (isenable );
18. }
19. Catch (exception E)
20. {
21. E. printstacktrace ();
22. }
24. }

In this way, you can turn on the flashlight. Permissions to be used:

[HTML]
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1. <Span style = "font-size: 18px;"> <uses-Permission Android: Name = "android. Permission. Flashlight"/>
2. <Uses-Permission Android: Name = "android. Permission. hardware_test"/> </span>

2. Use a camera to control the flashlight

This is another direction of thinking. Camera comes with a variety of interfaces and parameters. We just need to use them.

[Java]
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1. <Span style = "font-size: 18px;"> private camera = NULL;
2. Private parameters = NULL;
3. // Directly enable
4. Camera = camera. open ();
5. Parameters = camera. getparameters ();
6. Parameters. setflashmode (parameters. flash_mode_torch); // enable
7. Camera. setparameters (parameters );
8. // Close directly
9. Parameters. setflashmode (parameters. flash_mode_off); // close
10. Camera. setparameters (parameters );
11. Camera. Release (); </span>

If you encounter this problem, you can try the preview method of camera:

[Java]
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1. Private void openlighton (){
2. If (null = m_camera)
3. {
4. M_camera = camera. open ();
5. }
7. Camera. parameters = m_camera.getparameters ();
8. Parameters. setflashmode (camera. Parameters. flash_mode_torch );
9. M_camera.setparameters (parameters );
10. M_camera.autofocus (new camera. autofocuscallback (){
11. Public void onautofocus (Boolean success, camera ){
12. }
13. });
14. M_camera.startpreview ();
15. }
17. Private void closelightoff (){
18. If (m_camera! = NULL)
19. {
20. M_camera.stoppreview ();
21. M_camera.release ();
22. M_camera = NULL;
23. }
24. }