創(chuàng)建BaseAppManager

/**
 * Create By Chen en  on 2019/4/18
 * Class Note:
 * use {@link LinkedList} to manage your activity stack
 */
public class BaseAppManager {
    
    private static BaseAppManager instance = null;
    private static List<Activity> mActivities = new LinkedList<Activity>();
    private BaseAppManager() {
    }
    public static BaseAppManager getInstance() {
        if (null == instance) {
            synchronized (BaseAppManager.class) {
                if (null == instance) {
                    instance = new BaseAppManager();
                }
            }
        }
        return instance;
    }

    //獲取activity個數(shù)
    public int size() {
        return mActivities.size();
    }

    //獲取前一個activity
    public synchronized Activity getForwardActivity() {
        return size() > 0 ? mActivities.get(size() - 1) : null;
    }

    //添加activity
    public synchronized void addActivity(Activity activity) {
        mActivities.add(activity);
    }

    //結束activity
    public synchronized void removeActivity(Activity activity) {
        if (mActivities.contains(activity)) {
            mActivities.remove(activity);
        }
    }

    //結束所以activity
    public synchronized void clear() {
        for (int i = mActivities.size() - 1; i > -1; i--) {
            Activity activity = mActivities.get(i);
            removeActivity(activity);
            activity.finish();
            i = mActivities.size();
        }
    }

    //保留后兩位activity
    public synchronized void clearTop() {
        for (int i = mActivities.size() - 2; i > -1; i--) {
            Activity activity = mActivities.get(i);

            removeActivity(activity);
            activity.finish();
            i = mActivities.size() - 1;
        }
    }

    //保留當前activity
    public synchronized void clearToLiveTopAndBottom() {
        for (int i = mActivities.size() - 1; i > 0; i--) {
            Activity activity = mActivities.get(i);
            removeActivity(activity);
            activity.finish();

        }
    }

    //結束當前和上一個activity
    public synchronized void clearTopTow() {
        LoggerUtil.e("BaseAppManager", "  clearTopTow  : i " + (mActivities.size() - 1) + "  index : " + (mActivities.size() - 2));
        int index = mActivities.size() - 3;
        for (int i = mActivities.size() - 1; i > index; i--) {
            Activity activity = mActivities.get(i);
            removeActivity(activity);
            activity.finish();

        }
    }

使用：為了進行統(tǒng)一處理，我們可以寫在BaseActivity中：

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

         BaseAppManager.getInstance().addActivity(this); //添加
    }

  @Override
    public void finish() {
        super.finish();
        BaseAppManager.getInstance().removeActivity(this);//移除
    }