Android Flashlight Development Source code

Implement Step 1. Modify the layout file code activity_main.xml

1 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"2 Xmlns:tools= "Http://schemas.android.com/tools"3 Android:layout_width= "Match_parent"4 Android:layout_height= "Match_parent"5 android:orientation= "vertical">6 7    <Button8        Android:id= "@+id/btn_flash"9 Android:layout_width= "Match_parent"Ten Android:layout_height= "Wrap_content" One Android:text= "Flashlight is OFF!" "/> A  - </LinearLayout>

2. Add the permissions you need to use in Androidmanifest.xml

1 <!--Camera, Flashlight -2 <uses-permissionAndroid:name= "Android.permission.CAMERA" />3 <uses-permissionAndroid:name= "Android.permission.FLASHLIGHT" />4 <uses-featureAndroid:name= "Android.hardware.camera" />5 <uses-featureAndroid:name= "Android.hardware.camera.autofocus" />6 <uses-featureAndroid:name= "Android.hardware.camera.flash" />

• Android.permission.CAMERA:Required to is able to access the CAMERA device.
• Android.permission.FLASHLIGHT:Allows access to the flashlight

3. Modify Mainactivity

1  Packagecom.example.test;2 3 Importandroid.app.Activity;4 ImportAndroid.hardware.Camera;5 Importandroid.hardware.Camera.Parameters;6 ImportAndroid.os.Bundle;7 ImportAndroid.view.View;8 ImportAndroid.view.View.OnClickListener;9 ImportAndroid.widget.Button;Ten ImportAndroid.widget.Toast; One  A  Public classMainactivityextendsActivity { -  -     Private BooleanIsOpen =false;//Record Flashlight Status the     PrivateCamera camera;// -     PrivateButton Btn_flash; -  - @Override +     protected voidonCreate (Bundle savedinstancestate) { -         //TODO auto-generated Method Stub +         Super. OnCreate (savedinstancestate); A Setcontentview (r.layout.activity_main); at  -Btn_flash =(Button) Findviewbyid (r.id.btn_flash); -Btn_flash.setonclicklistener (NewOnclicklistener () { - @Override -              Public voidOnClick (View v) { -                 if(!isopen) {//If the flashlight is turned on inToast.maketext (Getapplicationcontext (), "Flashlight turned on", 0). Show (); -Camera =Camera.open (); toParameters params =camera.getparameters (); + Params.setflashmode (parameters.flash_mode_torch); - camera.setparameters (params); theCamera.startpreview ();//Start Light *IsOpen =true; $Btn_flash.settext ("Flashlight is turned on! ");Panax Notoginseng}Else { -Toast.maketext (Getapplicationcontext (), "Turn off the flashlight", the toast.length_short). Show (); +Camera.stoppreview ();//Turn off the lights . ACamera.release ();//turn off the camera theIsOpen =false; +Btn_flash.settext ("Flashlight is off! "); -                 } $             } $         }); -     } -  the}

Android Flashlight Development Source code