android global data sharing

This afternoon encounter problems between screen pass parameters through pointers that can be used to save the global rewrite Application Data

Examples http://www.eoeandroid.com/thread-30257-1-1.html
then post on according to
Made a small example, but always reported ClassCastException, wrong seek expert advice in the following code
android.app.Application
appTest.java
public class appTest extends Activity {
/ ** Called when the activity is first created. * /
@ Override
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.main);
. ((App) getApplication ()) setDemo ("sss");
String demo = ((App) getApplication ()) getDemo ();.
}
}

Application files rewritten
App.java

import android.app.Application;

public class App extends Application {

private String demo;

public String getDemo () {
return demo;
}

public void setDemo (String demo) {
this.demo = demo;
}
}

AndroidManifest.xml


package = "com.appTest"
android: versionCode = "1"
android: versionName = "1.0">

"appTest."android: label = "@ string / app_name">







android: icon = "@ drawable / icon"
android: label = "@ string / app_name">


App.java and appTest.java are com.appTest
in the same package
Seek expert advice! ~! ~! ~ Thank you brother first

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Solve the problem is not configured to AndroidManifest android: name = ". App" into the first application configured in just fine
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Get it to pick points up :)
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Do not understand how
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http://www.eoeandroid.com/thread-30257-1-1.html
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reference to the third floor qthsrs232 reply:

do not understand how

this can take points