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package net.oschina.app;

import java.util.Stack;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;

public class AppManager {
    private static Stack<Activity> activityStack;
    private static AppManager instance;

    private AppManager(){}

    /**
     * Singleton instance
     */
    public static AppManager getAppManager(){
        if(instance==null){
            instance=new AppManager();
        }
        return instance;
    }

    /**
     * Add Activity to stack
     */
    public void addActivity(Activity activity){
        if(activityStack==null){
            activityStack=new Stack<Activity>();
        }
        activityStack.add(activity);
    }

    /**
     * Get the current Activity (the last one pushed into the stack)
     */
    public Activity currentActivity(){
        Activity activity=activityStack.lastElement();
        return activity;
    }

    /**
     * Finish the current Activity (the last one pushed into the stack)
     */
    public void finishActivity(){
        Activity activity=activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * Finish the specified Activity
     */
    public void finishActivity(Activity activity){
        if(activity!=null){
            activityStack.remove(activity);
            activity.finish();
            activity=null;
        }
    }

    /**
     * Finish the Activity with the specified class name
     */
    public void finishActivity(Class<?> cls){
        for (Activity activity : activityStack) {
            if(activity.getClass().equals(cls) ){
                finishActivity(activity);
            }
        }
    }

    /**
     * Finish all Activities
     */
    public void finishAllActivity(){
        for (int i = 0, size = activityStack.size(); i < size; i++){
            if (null != activityStack.get(i)){
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }

    /**
     * Exit the application
     */
    public void AppExit(Context context) {
        try {
            finishAllActivity();
            ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            activityMgr.restartPackage(context.getPackageName());
            System.exit(0);
        } catch (Exception e) {    }
    }
}