简单! !

那些你想作为全局变量访问的变量，你可以声明为静态变量。现在，你可以通过

classname.variablename;

public class MyProperties {
private static MyProperties mInstance= null;

static int someValueIWantToKeep;

protected MyProperties(){}

public static synchronized MyProperties getInstance(){
    if(null == mInstance){
        mInstance = new MyProperties();
    }
    return mInstance;
}

}

MyProperites.someValueIWantToKeep;

Thats It !;)

你可以像这样使用单例模式:

package com.ramps;

public class MyProperties {
private static MyProperties mInstance= null;

public int someValueIWantToKeep;

protected MyProperties(){}

public static synchronized MyProperties getInstance() {
        if(null == mInstance){
            mInstance = new MyProperties();
        }
        return mInstance;
    }
}

在你的应用程序中，你可以这样访问你的单例:

MyProperties.getInstance().someValueIWantToKeep

// My Class Global Variables  Save File Global.Java
public class Global {
    public static int myVi; 
    public static String myVs;
}

// How to used on many Activity

Global.myVi = 12;
Global.myVs = "my number";
........
........
........
int i;
int s;
i = Global.myVi;
s = Global.myVs + " is " + Global.myVi;

有几种不同的方法可以达到你的要求。

1)。扩展应用程序类并在那里实例化控制器和模型对象。

public class FavoriteColorsApplication extends Application {

    private static FavoriteColorsApplication application;
    private FavoriteColorsService service;

    public FavoriteColorsApplication getInstance() {
        return application;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        application = this;
        application.initialize();
    }

    private void initialize() {
        service = new FavoriteColorsService();
    }

    public FavoriteColorsService getService() {
        return service;
    }

}

然后你可以在任何时候从你的自定义Application对象中调用你的单例:

public class FavoriteColorsActivity extends Activity {

private FavoriteColorsService service = null;
private ArrayAdapter<String> adapter;
private List<String> favoriteColors = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_favorite_colors);

    service = ((FavoriteColorsApplication) getApplication()).getService();
    favoriteColors = service.findAllColors();

    ListView lv = (ListView) findViewById(R.id.favoriteColorsListView);
    adapter = new ArrayAdapter<String>(this, R.layout.favorite_colors_list_item,
            favoriteColors);
    lv.setAdapter(adapter);
}

2)。你可以让你的控制器只创建一个它自己的单例:

public class Controller {
    private static final String TAG = "Controller";
    private static sController sController;
    private Dao mDao;

    private Controller() {
        mDao = new Dao();    
    }

    public static Controller create() {
        if (sController == null) {
            sController = new Controller();
        }
        return sController;
    }
}

然后你可以从任何Activity或Fragment调用create方法，如果一个控制器不存在，它会创建一个新的控制器，否则它会返回先前存在的控制器。

3)。最后，在Square上创建了一个灵活的框架，为你提供Android内部的依赖注入。它叫匕首。我不会在这里详细说明如何使用它，但如果你需要这类东西，它是非常灵巧的。

我希望我已经给出了足够的细节，告诉你如何去做你所希望的事情。

简单! !

那些你想作为全局变量访问的变量，你可以声明为静态变量。现在，你可以通过

classname.variablename;

public class MyProperties {
private static MyProperties mInstance= null;

static int someValueIWantToKeep;

protected MyProperties(){}

public static synchronized MyProperties getInstance(){
    if(null == mInstance){
        mInstance = new MyProperties();
    }
    return mInstance;
}

}

MyProperites.someValueIWantToKeep;

Thats It !;)

试着这样做:

创建共享数据类:

SharedData.java

import android.app.Application;

/**
 * Created by kundan on 6/23/2015.
 */
public class Globals {


    private static Globals instance = new Globals();

    // Getter-Setters
    public static Globals getInstance() {
        return instance;
    }

    public static void setInstance(Globals instance) {
        Globals.instance = instance;
    }

    private String notification_index;


    private Globals() {

    }


    public String getValue() {
        return notification_index;
    }


    public void setValue(String notification_index) {
        this.notification_index = notification_index;
    }



}

在那些你想要设置/获取数据的类中声明/初始化一个类的全局实例(在onCreate()方法之前使用此代码)

Globals sharedData = Globals.getInstance();

组数据:

sharedData.setValue("kundan");

得到的数据:

String n = sharedData.getValue();