Android simple flashlight Production

Here is a simple source code for making a flashlight:

1. xml layout:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"        android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >      <ImageView       android:id="@+id/img_std"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      /></LinearLayout>

2. actity code:

Package COM. diecolor; import android. app. activity; import android. hardware. camera; import android. hardware. camera. parameters; import android. OS. bundle; import android. view. view; import android. view. view. onclicklistener; import android. widget. imageview; public class stdactivity extends activity {imageview; Boolean flag = false; camera; @ overrideprotected void oncreate (bundle savedinstancestate) {// Todo auto-generated method stubsuper. oncreate (savedinstancestate); setcontentview (R. layout. SDT); imageview = (imageview) findviewbyid (R. id. img_std); imageview. setimageresource (R. drawable. SDT); imageview. setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view v) {// todo auto-generated method stubif (FLAG) {If (camera! = NULL) {Camera. stoppreview (); camera. release (); flag = false; imageview. setimageresource (R. drawable. SDT) ;}} else {Camera = camera. open (); // enable camera parameters = camera. getparameters (); parameters. setflashmode (parameters. flash_mode_torch); // enable camera. setparameters (parameters); camera. startpreview (); flag = true; imageview. setimageresource (R. drawable. sdtopen );}}});}}

3. permission settings

 <uses-permission android:name="android.permission.CAMERA" />    <uses-feature android:name="android.hardware.camera" />    <uses-feature android:name="android.hardware.camera.autofocus" />

, 4, code parsing:

If camera is not empty, camera. stoppreview (); camera. Release ();

Set the flag value to flase and modify the image imageview. setimageresource (R. drawable. SDT );

Otherwise, open camera, camera = camera. open ();

Never forget to set parameters,

Parameters = camera. getparameters ();

Parameters. setflashmode (parameters. flash_mode_torch );

Camera. setparameters (parameters );