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本文出自Shawpoo的簡書
我的博客：CSDN博客

在日常的APP開發中，為了對APP中所有的Activity進行管理，所以統一放在Stack中處理。

• 創建AppManager：

public class AppManager {

    public static Stack<Activity> getActivityStack() {
        return activityStack;
    }

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

    private AppManager() {
    }

    /**
     * 單一實例
     */
    public static AppManager getInstance() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }

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

    /**
     * 獲取棧頂Activity（堆棧中最后一個壓入的）
     */
    public Activity getTopActivity() {
        return activityStack.lastElement();
    }

    /**
     * 結束棧頂Activity（堆棧中最后一個壓入的）
     */
    public void finishTopActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 結束指定類名的Activity
     *
     * @param cls
     */
    public void finishActivity(Class<?> cls) {
        Iterator iterator = activityStack.iterator();
        while (iterator.hasNext()) {
            Activity activity = (Activity) iterator.next();
            if (activity.getClass().equals(cls)) {
                iterator.remove();
                activity.finish();
            }
        }
    }

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

    /**
     * 退出應用程序
     */
    public void appExit() {
        try {
            finishAllActivity();
            System.exit(0);
            android.os.Process.killProcess(android.os.Process.myPid());

        } catch (Exception e) {
        }
    }

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

    /**
     * 得到指定類名的Activity
     */
    public Activity getActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                return activity;
            }
        }
        return null;
    }

}

• 使用：為了進行統一處理，我們可以寫在BaseActivity中：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_base);
        AppManager.getInstance().addActivity(this); //添加到棧中
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        AppManager.getInstance().finishActivity(this); //從棧中移除
    }