Activity堆栈式管理

ActivityManager.java

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

/**
 * activity堆栈式管理
 */
public class ActivityManager {

    private static Stack<Activity> activityStack;
    private static ActivityManager instance;

    private ActivityManager() {
    }

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

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        if (activityStack == null) {
            activityStack = new Stack<Activity>();
        }
        activityStack.add(activity);
    }

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

    /**
     * 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 && !activity.isFinishing()) {
            activityStack.remove(activity);
            activity.finish();
            activity = null;
        }
    }

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

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

    /**
     * 通过类名-获取指定的Activity
     */
    public static Activity getActivity(Class<?> cls) {
        if (activityStack != null)
            for (Activity activity : activityStack) {
                if (activity.getClass().equals(cls)) {
                    return activity;
                }
            }
        return null;
    }

    /**
     * 从堆栈中移除某个activity
     * @param activity
     */
    public void removeActivity(Activity activity) {
        activityStack.remove(activity);
    }

    /**
     * 清除所有activity 返回首页
     */
    public void backMain() {
        List<Activity> list = new ArrayList<Activity>();
        for (Activity act : activityStack) {
            if (!act.getClass().equals(MainActivity.class)) {
                list.add(act);
            }
        }
        for (Activity act : list) {
            if (!act.isFinishing()) {
                act.finish();
            }
        }
    }
}