Android Flashlight Case

Recently in the study of Android Development, wrote a flashlight case, share!

activity.xmlpackage com.fq.flashlight;import android.app.activity;import  Android.app.alertdialog;import android.content.dialoginterface;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.Button;import android.widget.TextView; public class lightactivity extends activity {button button = null;// Create a variable of type button textview textview = null;//Create a variable of type TextView camera camera = null;// Create a variable of camera type parameters params = null;//create a variable of type parameters boolean flag = true;// Creates a Boolean variable that is used to make an open decision @overrideprotected void oncreate (bundle savedinstancestate) { Super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_light);button =  (Button) Findviewbyid (R.id.button);//Gets the button object Textview =&nbSP; (TextView)  findviewbyid (R.id.textview);//Get TextView object Button.setonclicklistener (new  Onclicklistener ()  { //Click event @overridepublic void onclick (VIEW V)  {if (flag) {camera  = camera.open ();     //get camera params = camera.getparameters (); Params.setflashmode (Parameters.flash_mode_torch); camera.setparameters (params); Camera.startpreview (); Textview.settext (r.string.alert_on); Button.settext (r.string.button_off); flag = false;} Else{params.setflashmode (Parameters.flash_mode_off); camera.setparameters (params); Camera.stoppreview (); Camera.release (); Textview.settext (R.string.alert_off); Button.settext (r.string.button_on); flag = true ;}}});} Public void onbackpressed () {//super.onbackpressed (); System.out.println ("Sdsfs"); New alertdialog.builder (this). Settitle ("OK to exit?"). "). SetIcon (R.drawable.ic_launcher). Setpositivebutton (" OK ",  new dialoginterface.onclicklistener ()  {@Overridepublic  void&Nbsp;onclick (DIALOGINTERFACE ARG0, INT ARG1)  {// todo auto-generated method  stublightactivity.this.finish (); System.exit (0);}}). Setnegativebutton ("Cancel",  new dialoginterface.onclicklistener ()  {@Overridepublic  void  onclick (DIALOGINTERFACE ARG0, INT ARG1)  {// TODO Auto-generated  Method stub}}). Show ();}}

<!--strings.xml--><?xml version= "1.0"  encoding= "Utf-8 "? ><resources>    <string name=" App_name ">blueocean flashlight </string>     <string name= "Hello_world" >Hello world!</string>     <string name= "Action_settings" >settings</string>   <string  name= "alert_on" > Flashlight current status: Turn on </string><string name= "Alert_off" > Flashlight current status: Off </string ><string name= "button_on" > Turn on Flashlight </string><string name= "Button_off" > Turn off Flashlight </ String><string name= "Author" >AUTHOR:BLUEOCEAN</STRING></RESOURCES> 

<!--layout.xml--><?xml version= "1.0"  encoding= "Utf-8"? ><relativelayout xmlns: Android= "Http://schemas.android.com/apk/res/android"     android:layout_width= "match_parent "    android:layout_height=" Match_parent " >    <textview         android:id= "@+id/textview"          android:layout_width= "Wrap_content"         android:layout_ height= "Wrap_content"         android:layout_alignparenttop= "true"         android:layout_centerhorizontal= "true"          android:layout_margintop= "34DP"         android : text= "@string/alert_off"         android:textsize= "22SP"  />     <button        android:id= "@+id/button"          android:layout_width= "Wrap_content"          android:layout_height= "Wrap_content"         android:layout_below= "@+id /textview "        android:layout_centerhorizontal=" true "         android:layout_margintop= "26DP"          android:text= "@string/button_on"  />    <TextView         android:id= "@+id/textview2"         android: Layout_width= "Wrap_content"         android:layout_height= "wrap_content "        android:layout_alignright="     "@+id/textview"     &nBsp;android:layout_centervertical= "true"         android:text= "@string/ Author "        android:textappearance="? android:attr/ Textappearancesmall " /></RelativeLayout>

<!-- manifest.xml--><?xml version= "1.0"  encoding= "Utf-8"? ><manifest xmlns: Android= "Http://schemas.android.com/apk/res/android"     package= "Com.fq.flashlight"      android:versioncode= "1"     android:versionname= "1.0"  >     <uses-sdk        android:minsdkversion= "8"          android:targetsdkversion= " />    <" Uses-permission android:name= "Android.permission.CAMERA"/><uses-permission android:name= " Android.permission.FLASHLIGHT "/>        <application         android:allowbackup= "true"          android:icon= "@drawable/ic_launcher"         android:label= "@string/app _name "  &nbsP;     android:theme= "@style/apptheme"  >         <activity            android:name= " . Mainactivity "            android:label=" @string/ App_name " >        </activity>                 <activity             android:name= ". Lightactivity "            android:label=" @string/ App_name " >            <intent-filter >                <action  android:name= "Android.intent.action.MAIN" &NBSP;/&GT;&NBSP;&Nbsp;              <category  Android:name= "Android.intent.category.LAUNCHER"  />             </intent-filter>        </activity >    </application></manifest>

This article is from the "Blueocean" blog, make sure to keep this source http://bluocean.blog.51cto.com/8199259/1554839

Android Flashlight Case