AppManager.java

package com.llf.basemodel.utils;

import android.app.Activity;
import java.util.Stack;

/**
 * Created by llf on 2017/3/1.
 * Activity管理栈
 */

public class AppManager {
    private static Stack<Activity> activityStack;
    public volatile static AppManager instance = new AppManager();

    private AppManager() {
        activityStack = new Stack<>();
    }

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

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        try {
            Activity activity = activityStack.lastElement();
            return activity;
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 返回到指定类名的activity
     *
     * @param cls
     */
    public void returnToActivity(Class<?> cls) {
        while (activityStack.size() != 0)
            if (activityStack.peek().getClass() == cls) {
                break;
            } else {
                finishActivity(activityStack.peek());
            }
    }

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

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

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

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

    }

    /**
     * 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();
    }

    /**
     * 是否已经打开指定的activity
     *
     * @param cls
     * @return
     */
    public boolean isOpenActivity(Class<?> cls) {
        if (activityStack != null) {
            for (int i = 0, size = activityStack.size(); i < size; i++) {
                if (cls == activityStack.peek().getClass()) {
                    return true;
                }
            }
        }
        return false;
    }
}