解决Fragment的重叠问题

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对前台进入后台后再次恢复前台出现所有不显示的bug进行了处理

先来看原来的代码

 @Override
    protected void onSaveInstanceState(Bundle outState) {
        if (outState!=null){
            FragmentTransaction transaction=fragmentManager.beginTransaction ();
            if (messageFragment!=null){
                transaction.hide ( messageFragment );
            }if (newsFragment!=null){
                transaction.hide ( newsFragment );
            }if (settingFragment!=null){
                transaction.hide ( settingFragment );
            }
            transaction.commit ();

//            setTabSelection(0);
        }

        super.onSaveInstanceState ( outState );
    }
//
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
//        FragmentTransaction transaction=fragmentManager.beginTransaction ();
//        hideFragment(transaction);
//        transaction.commit ();
//        setTabSelection(0);
        FragmentTransaction transaction=fragmentManager.beginTransaction ();
        if (savedInstanceState!=null){
            //隐藏碎片 避免重叠

            if (messageFragment!=null){
                transaction.hide ( messageFragment );

                }if (newsFragment!=null){
                transaction.hide ( newsFragment );

            }if (settingFragment!=null) {
                transaction.hide ( settingFragment );
            }
//            as ( 0 );

            transaction.commit ();



        }



        super.onRestoreInstanceState ( savedInstanceState );
    }

在进行数据恢复的时候选择了隐藏所有fragment 所以活动销毁或进入后台都会再次启用数据恢复
我选择在activity生命周期进行显示的周期进行了一个判断如果缓存不为空则进行选中
下面来看我修改的东西
添加一个全局对象用来判断数据缓存是否为空因为第一次显示你如果不判断直接造成重叠

private Bundle bundle;
  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate ( savedInstanceState );
        this.bundle=savedInstanceState;
        }

你可以根据需要选择恢复的tab项这里我选择恢复第一项可以写一个布尔值当选中哪一项放到缓存中判断是哪一项保存住了然后进行恢复

@Override
protected void onResume() {
    super.onResume ();
    if (bundle!=null){
        setTabSelection ( 0 );
    }

}

这里重写保存数据和恢复数据选中放到了activity显示的地方这样可以在不同的生命周期进行恢复解决了无法提交两次的问题在数据恢复的时候我添加了恢复fragment1
但不显示因为前面已经把所有的framgent进行了隐藏进行了提交再次提交已经解决不了问题了

 @Override
    protected void onSaveInstanceState(Bundle outState) {
        if (outState!=null){
            FragmentTransaction transaction=fragmentManager.beginTransaction ();
            if (messageFragment!=null){
                transaction.hide ( messageFragment );
            }if (newsFragment!=null){
                transaction.hide ( newsFragment );
            }if (settingFragment!=null){
                transaction.hide ( settingFragment );
            }
            transaction.commit ();

//            setTabSelection(0);
        }

        super.onSaveInstanceState ( outState );
    }
//
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
//        FragmentTransaction transaction=fragmentManager.beginTransaction ();
//        hideFragment(transaction);
//        transaction.commit ();
//        setTabSelection(0);
        FragmentTransaction transaction=fragmentManager.beginTransaction ();
        if (savedInstanceState!=null){
            //隐藏碎片 避免重叠

            if (messageFragment!=null){
                transaction.hide ( messageFragment );

                }if (newsFragment!=null){
                transaction.hide ( newsFragment );

            }if (settingFragment!=null) {
                transaction.hide ( settingFragment );
            }
//            as ( 0 );

            transaction.commit ();



        }



        super.onRestoreInstanceState ( savedInstanceState );
    }

建议看这个来看一下我对fragment的嵌套基础你会有更大的收获
https://blog.csdn.net/qq_41912447/article/details/84934029

解决Fragment的重叠问题

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