Android Universal Flashlight Code

Speaking of mobile phone flashlight function, many people are directly call the Flash, and this article to introduce you to the camera function to achieve, there is a need for small partners to refer to.

A few days ago this side of a community power, black Ma Ma, a cat broke into the dormitory, frighten me into tears, and then decisively wrote a flashlight, the next power outage, again, I want to frighten it.

I saw a lot of people are directly call the flash, in fact, most of the models are not supported, I this is to use the camera function to achieve, most of the models are supported.

Mainactivity.class

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public class Mainactivity extends Fragmentactivity {  @Override protected void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main);   if (isflashsupported ()) {if ( Savedinstancestate = = null) {Getsupportfragmentmanager (). BeginTransaction (). Add (R.id.container, new Flashlightfragment ()). commit (); } else {Shownoflashalert ();}}   private void Shownoflashalert () {new Alertdialog.builder (this). Setmessage (r.string.device_not_support_msg). SetIcon (Android. R.drawable.ic_dialog_alert). Settitle (R.string.device_not_support_title). Setpositivebutton (R.string.ok, new Dialoginterface.onclicklistener () {  @Override public void OnClick (Dialoginterface dialog, int which) {dialog.dism ISS (); Finish (); ). Create (). Show (); }   Private Boolean isflashsupported () {Packagemanager pm = Getpackagemanager (); return Pm.hassystemfeature (Package Manager.feature_camera_flash); }   public static class FlashlightfraGment extends Fragment implements Surfaceholder.callback {  public flashlightfragment () {}   ImageButton BTNSW Itch; ImageView BG; Private Boolean Islighon = false;   Private Camera Camera; Camera.parameters params;   @Override public void OnStart () {Super.onstart (); Surfaceview preview = (surfaceview) GetView (). Findviewbyid (R.id.preview); Surfaceholder Mholder = Preview.getholder (); Mholder.addcallback (this); }   @Override public void OnPause () {super.onpause (); Turnoffflash ();}   @Override public View Oncreateview (La Youtinflater inflater, ViewGroup container, Bundle savedinstancestate) {View view = Inflater.inflate (R.layout.fragment_ Main_activity, container, false);  //Flash switch button Btnswitch = (ImageButton) View.findviewbyid (R.id.flashlight_button);   BG = (ImageView) View.findviewbyid (R.ID.FLASHLIGHT_BG);  //displaying button image togglebgimage ();  //Switch button click event to toggle Flash On/off Btnswitch.setoncLicklistener (New View.onclicklistener () {  @Override public void OnClick (View v) {if (Islighon) {Turnoffflash ();} else {Turnonflash ();}} });   return view; }  //turning on flash private void Turnonflash () {  if (!islighon) {if (camera = = NULL | | params = NULL) { Return } params = Camera.getparameters (); Params.setflashmode (Camera.Parameters.FLASH_MODE_TORCH); Camera.setparameters (params); Camera.startpreview (); Islighon = true;   Togglebgimage (); }  }  //turning off flash private void Turnoffflash () {  if (Islighon) {if (camera = = NULL | | params = = null) {return;}   params = Camera.getparameters (); Params.setflashmode (Camera.Parameters.FLASH_MODE_OFF); Camera.setparameters (params); Camera.stoppreview (); Islighon = false;   Togglebgimage (); }   private void Togglebgimage () {if (Islighon) {bg.setimageresource (r.mipmap.f_on);} else {Bg.setimageresource (R.mipmap.f_off); }}   @Override public void surfaceChanged (surfaceholder holder, int format, int width, int height) { }   @Override public void surfacedestroyed ( Surfaceholder holder) {if (camera!= null) {Camera.stoppreview (); Camera.setpreviewcallback (null); Camera.release (); CA Mera = null; }   @Override public void surfacecreated (Surfaceholder holder) {if (camera = = null) {camera = Camera.open (); para ms = Camera.getparameters (); try {camera.setpreviewdisplay (holder);} catch (IOException e) {camera.release (); camera = null;}}   Turnonflash (); }  }    }

Fragment_main_activity.xml

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<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" android:layout_width= "match_parent "android:layout_height=" match_parent "> <surfaceview android:id=" @+id/preview "android:layout_width=" 1DP " android:layout_height= "1DP"/> <imageview android:id= "@+id/flashlight_bg" android:layout_width= "Match_parent" "Android:layout_height=" match_parent "android:src=" @mipmap/f_on "android:scaletype=" Centercrop "/>" < ImageButton android:id= "@+id/flashlight_button" android:layout_width= "100DP" android:layout_height= "200DP" Android : Layout_centerinparent= "true" android:background= "@android: color/transparent" android:text= "Fuck"/> </ Relativelayout>

Activity_main.xml

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<framelayout xmlns:android= "http://schemas.android.com/apk/res/android" android:id= "@+id/container" Android: Layout_width= "Match_parent" android:layout_height= "Match_parent"/>

Androidmanifest.xml

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<?xml version= "1.0" encoding= "Utf-8"?> <manifest xmln S:android= "Http://schemas.android.com/apk/res/android" package= "Com.liujinghuiuncleapp.app.tool.flashlight" >   <uses-permission android:name= "Android.permission.CAMERA"/> <uses-permission android:name= " Android.permission.FLASHLIGHT "/>   <uses-feature android:name=" Android.hardware.camera "/> < Uses-feature android:name= "Android.hardware.camera.flash"/>   <application android:allowbackup= "true" android:icon= "@mipmap/ic_launcher" android:theme= "@style/apptheme" android:label= "@string/app_name" > < Activity android:name= ". Mainactivity "android:label=" @string/app_name "> <intent-filter> <action android:name=" Android.intent.action.MAIN "/>   <category android:name=" Android.intEnt.category.LAUNCHER "/> </intent-filter> </activity> </application>   </manifest>

The above is the entire contents of this article, I hope you can enjoy.