Use of application in Android

Source: Internet
Author: User

Application globally unique, if you need to place a global variable, you need to use application, similar to the Singleton class in OC, the appdelegate in the receiving OC

First step: Create a Appcontext inheritance application

public class AppContext extends application {
private static AppContext instance; public static AppContext getinstance () { return instance; } @Override public void OnCreate () { //TODO auto-generated method Stub super.oncreate (); instance = this; }}

Step Two: Register

<application    android:name= ". AppContext "    android:icon=" @drawable/ic_launcher "    android:label=" @string/app_name "    android:theme = "@style/apptheme" >

If we need to get context:

Appcontext.getinstance (). Getexternalfilesdir (NULL);

Use of application in Android

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