android 手动管理activity栈，实现跳转指定页面

需求：某层次很深的一个acticity有个退出登录按钮
难点：for循环finish太不优雅了
实现：

第一步: 工具类

import android.app.Activity;

import java.util.Stack;

/**
 * Created by jing on 17/5/24.
 * 管理 Activity 的 视图栈
 */

public class KapApplicationActivitysQueue {
    private KapApplicationActivitysQueue(){}
    private static KapApplicationActivitysQueue queue = new KapApplicationActivitysQueue();
    public static KapApplicationActivitysQueue ShareActivityQueue(){
        return queue;
    }
    private Stack activityStack = new Stack();

    /** 获取当前的activity，不做任何操作 */
    public  Activity currentActivity() {
        return activityStack.lastElement();
    }


    /**
     * 只有这俩方法 操作 activityStack不能手动调用（都是自动添加删除的）
     * addActivity 添加Activity到堆栈
     * popCurrentActivity 结束当前Activity
     * currentActivity
     */
    public void addActivity(Activity activity) {
        activityStack.push(activity);
    }
    public void popCurrentActivity(Activity activity) {
        activityStack.remove(activity);
    }

    /**
     * 下面的这些方法都是辅助方法 (注意防止当前activity结束当前的导致crash)
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    // 结束指定的Activity
    public  void finishOneActivity(Activity activity) {
        if (activity != null) {
            if(!activity.isFinishing()) {
                activity.finish();
            }
        }
    }
    // 结束指定类名的Activity
    public  void finishOneActivity(Class cls) {
        for (Activity activity : activityStack) {
            if (!activity.getClass().equals(cls)) continue;
            finishOneActivity(activity);
            return;
        }
    }
    /** 结束至指定类名Activity(不包括该类名) */
    public void finishToActiovity(Class cls){
        while (!activityStack.lastElement().getClass().equals(cls)){
            activityStack.pop().finish();
            if (activityStack.size() == 0) return;
        }
    }

    /** 结束除指定类名的所有Activity */
    public  void finishExcludeActivityAllActivity(Class cls) {
        for (Activity activity : activityStack) {
            if (activity == null) continue;
            if (activity.getClass().equals(cls)) continue;
            finishOneActivity(activity);
        }
    }
    /** 结束所有Activity */
    public  void finishAllActivity() {
        for (Activity activity : activityStack) {
            if (activity == null) continue;
            finishOneActivity(activity);
        }
    }
}

第二步：自定义的Application里面

public class KapApplication extends Application{
/**
     * activity栈管理
     * */
    private KapApplicationActivitysQueue activitysQueue = KapApplicationActivitysQueue.ShareActivityQueue();
    private ActivityLifecycleCallbacks activityLifecycleCallbacks = new ActivityLifecycleCallbacks() {
        @Override
        public void onActivityCreated(Activity activity, Bundle bundle) {
            activitysQueue.addActivity(activity);//创建
        }
        @Override
        public void onActivityDestroyed(Activity activity) {
            activitysQueue.popCurrentActivity(activity);// 推出
        }

        @Override
        public void onActivityStarted(Activity activity) {
        }

        @Override
        public void onActivityResumed(Activity activity) {
        }

        @Override
        public void onActivityPaused(Activity activity) {
        }

        @Override
        public void onActivityStopped(Activity activity) {

        }

        @Override
        public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {

        }
    };
    // 下面是辅助方法，仅供参考
    /** 会退至至指定的activity(此class成为当前显示的) */
    public static void popToActivity(Class cls){
        KapApplicationActivitysQueue activitysQueue = getInstance().activitysQueue;
        activitysQueue.finishToActiovity(cls);
    }
    /** 获取当前activity */
    public static Activity currentActivity(){
        KapApplicationActivitysQueue activitysQueue = getInstance().activitysQueue;
        return activitysQueue.currentActivity();
    }
    /** 切换根视图登录 */
    public static void goLoginActivity(){
        Class openClass = KapLoginActivity.class;
        changeRootActivityByClass(openClass);
    }
    /** 切换根视图主页 */
    public static void goMainActivity(){
        Class openClass = KapMainActivity.class;
        changeRootActivityByClass(openClass);
    }

    private static void changeRootActivityByClass(Class openClass){
        KapApplicationActivitysQueue activitysQueue = getInstance().activitysQueue;
        Activity currentActivity = activitysQueue.currentActivity();
        currentActivity.startActivity(new Intent(currentActivity, openClass));
        activitysQueue.finishExcludeActivityAllActivity(openClass);
    }
}

使用：

private void pushActivity(){
            KapApplication.goLoginActivity();//登录页
            KapApplication.goMainActivity();//主页
            KapApplication.popToActivity(KapMainActivity.class);// 回退到主页
    }

至此就完事了，更多特定的操作，看你们喜好了～～～