Extending Application to share variables globally

Question

I'm trying to share two ArrayLists across the various activities in my application, using the scheme explained here: How to declare global variables in Android?.

Here's my application subclass:

public class GlobalVars extends Application{  ArrayList<Player> players = new ArrayList<Player>();    ArrayList<String> playerNames = new ArrayList<String>();    public ArrayList<Player> getPlayers(){    return players;   }    public ArrayList<String> getPlayerNames(){    return playerNames;   }    public void setPlayers(ArrayList<Player> p){    players = p;   }    public void setPlayerNames(ArrayList<String> pn){    playerNames = pn;   }  } 

And used the code:

 GlobalVars gv = (GlobalVars)getApplicationContext();         players = gv.getPlayers();         playerNames = gv.getPlayerNames(); 

To access these variables. The first line there where I define gv throws a classcastexception. Anyone know why?

Here's the code I added to the manifest:

<application android:name="com.myname.GlobalVars"  android:icon="@drawable/icon"  android:label="@string/app_name"></application> 

edit:for clarification, here is my entire manifest:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.myname.bpstattracker" android:versionCode="1"     android:versionName="1.0">     <application android:icon="@drawable/icon" android:label="@string/app_name">         <activity android:name=".BPStatTracker" android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>          <activity android:name=".BPSTAdd"></activity>         <activity android:name=".OneOrThree"></activity>         <activity android:name=".SixOrTen"></activity>      </application>       <application android:name="com.myname.GlobalVars"         android:icon="@drawable/icon" android:label="@string/app_name">  </application> </manifest>  

Answer 1

To elaborate on Peter K's answer, you do not need to create a second <application> section for your derived Application class. You simply need to "rename" your existing <application> section by amending it with the android:name tag. I also want to point out that the fully qualified classname is required(as you've done correctly...I found this out the hard way).

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.myname.bpstattracker" android:versionCode="1"     android:versionName="1.0">     <application android:name="com.myname.GlobalVars" android:icon="@drawable/icon" android:label="@string/app_name">         <activity android:name=".BPStatTracker" android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>          <activity android:name=".BPSTAdd"></activity>         <activity android:name=".OneOrThree"></activity>         <activity android:name=".SixOrTen"></activity>      </application> </manifest>