Android退出应用方法总结

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

import java.util.Stack;

/**
 * 应用程序Activity管理类：用于Activity管理和应用程序退出
 *
 *
 */
public class AppManager {

    private Stack<Activity> activityStack;
    // 定义一个私有的静态全局变量来保存该类的唯一实例
    private static AppManager instance;

    // 构造函数必须是私有的 这样在外部便无法使用 new 来创建该类的实例
    private AppManager() {
        activityStack = new Stack<Activity>();
    }

    /**
     * 单一实例
     */
    public synchronized static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        activityStack.add(activity);
    }

    /**
     * 从堆栈移除指定的Activity
     */
    public void removeActivity(Activity activity) {
        if (activity != null) {
            activityStack.remove(activity);
            activity = null;
        }
    }

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        return activityStack.lastElement();
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity() {
        finishActivity(activityStack.lastElement());
    }

    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                finishActivity(activity);
            }
        }
    }

    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null) {
            activityStack.remove(activity);
            activity.finish();
            activity = null;
        }
    }

    /**
     * 结束所有Activity
     */
    public void finishAllActivity() {
        for (int i = 0, size = activityStack.size(); i < size; i++) {
            if (null != activityStack.get(i)) {
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }

    /**
     * 退出应用程序
     */
    @SuppressWarnings("deprecation")
    public void onAppExit(Context context) {
        try {
            finishAllActivity();
            ActivityManager activityMgr = (ActivityManager) context
                    .getSystemService(Context.ACTIVITY_SERVICE);
            activityMgr.restartPackage(context.getPackageName());
            System.exit(0);
        } catch (Exception e) {
        }
    }
}

Intent intent = new Intent(); 
intent.setClass(Android123.this, CWJ.class); 
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  //注意本行的FLAG设置 
startActivity(intent);