需求:介面A跳轉到介面B,之後再跳轉到介面A,此時需要銷燬第一次建立的介面A,以此類推….

思路:(在每次建立當前Activity的時候銷燬前部的activity即可,然後在添加當前activity的引用)

編寫ActivityManagement的介面控制管理器

package com.lzyc.ybtappcal.app;

import android.support.v4.app.FragmentActivity;

import java.util.LinkedList;

/**
 * 介面控制管理類
 * package_name com.lzyc.ybtappcal.app
 */
 

public class ActivityManagement {

    private static ActivityManagement instance;
    private static LinkedList<FragmentActivity> activityList;
    private static LinkedList<FragmentActivity> activityListRegister;
    private static LinkedList<FragmentActivity> activityListCapture;


    public
 
 ActivityManagement(){
        if(activityList==null){
            activityList=new LinkedList<FragmentActivity>();
        }
        if(activityListRegister==null){
            activityListRegister=new LinkedList<FragmentActivity>();
        }
        if(activityListCapture==null){
            activityListCapture=new
 
 LinkedList<FragmentActivity>();
        }
    }

    public static ActivityManagement getInstance(){
        if(instance==null){
            instance=new ActivityManagement();
        }
        return instance;
    }

    public void addActivity(FragmentActivity acy) {
        activityList.add(acy);
    }

    public void addActivityRegiser(FragmentActivity acy) {
        activityListRegister.add(acy);
    }

    public void addActivityCapture(FragmentActivity acy) {
        activityListCapture.add(acy);
    }

    /**
     * 銷燬所有
     */
    public static void removeAll(){
        FragmentActivity acy;
        while (activityList.size() != 0) {
            //poll(),方法檢索並移除此列表的頭元素(第一個元素)
            acy = activityList.poll();
            //isFinishing(),判斷當前activity是否被幹掉;避免空指標
            if (acy != null && !acy.isFinishing()) {
                acy.finish();
            }
        }
    }

    /**
     * 銷燬註冊相關介面
     */
    public static void removeRegisterAll(){
        FragmentActivity acy;
        while (activityListRegister.size() != 0) {
            acy = activityListRegister.poll();
            if (acy != null && !acy.isFinishing()) {
                acy.finish();
            }
        }
    }
    /**
     * 銷燬註冊相關介面
     */
    public static void removeCaptureAll(){
        FragmentActivity acy;
        while (activityListCapture.size() != 0) {
            acy = activityListCapture.poll();
            if (acy != null && !acy.isFinishing()) {
                acy.finish();
            }
        }
    }
}

這裡介面A和介面B,整合BaseActivity,所以我們在BaseActivity的onCreate中添加當前的引用到集合中去

第一步:BaseActivity中添加當前activity的引用

    ActivityManagement.getInstance().addActivity(this);

第二步:在介面A中先清空,在新增

       //移除做了判斷,避免第一次建立的時候沒有前一個空指標
        ActivityManagement.removeCaptureAll();
        ActivityManagement.getInstance().addActivityCapture(this);

第三步:在介面B新增,當前的應引用

   ActivityManagement.getInstance().addActivityCapture(this);

最後就搞定了,想寫Demo試試的話在 onCreate 和onDestory列印Log看看建立的次數即可

實現方式二: 介面A跳轉介面B(此時銷燬A),介面B在跳轉介面A(此時銷燬B),如此迴圈… 注:這些Activity都是在一個任務棧裡面的

簡單的實現為:

//只需要在介面跳轉的時候,給Flag,    findViewById(R.id.start_black).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                //設定這連個Flag就可以解決了
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                intent.setClass(ActivityThird.this, ActivitySecond.class);
                startActivity(intent);
            }
        });

如圖: