底部多个按钮切换Fragment,不重新实例化简单方法!

最新推荐文章于 2019-04-01 16:54:00 发布

那一刻-逐风

最新推荐文章于 2019-04-01 16:54:00 发布

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本文链接：https://blog.youkuaiyun.com/qq137464739/article/details/54906311

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记录下切换fragment不重新实例化的方法:像淘宝京东都是这样的效果.

private WarnFragment mWarnFragment;         //申明3个fragment  //我的
    private MyselfFragment mMyselfFragment;     //预警
    private CloudFragment mCloudFragment;       //云


//点击事件
mMainRbCloud.setOnClickListener(this);
        mMainRbWarn.setOnClickListener(this);
        mMainRbMine.setOnClickListener(this);


//默认选中第一个
setTabSelected(0);
//点击事件
@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.main_rb_cloud:
                setTabSelected(0);
                break;
            case R.id.main_rb_warn:
               
                setTabSelected(1);
                break;


            case R.id.main_rb_mine:
                setTabSelected(2);
                break;
        }
    }
//显示fragment
    private void setTabSelected(int index) {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();


        hideFragments(transaction);	//先隐藏所有的fragment


        switch (index) {
            case 0:
                if(mCloudFragment == null) {
                    mCloudFragment = new CloudFragment();
                    transaction.add(R.id.main_fr_content,mCloudFragment);
                } else {
                    transaction.show(mCloudFragment);
                }
                break;


            case 1:
                if(mWarnFragment == null) {
                    mWarnFragment = new WarnFragment();
                    transaction.add(R.id.main_fr_content,mWarnFragment);
                } else {
                    transaction.show(mWarnFragment);
                }
                break;


            case 2:
                if(mMyselfFragment == null) {
                    mMyselfFragment = new MyselfFragment();
                    transaction.add(R.id.main_fr_content,mMyselfFragment);
                } else {
                    transaction.show(mMyselfFragment);
                }
                break;
        }


        transaction.commit();
    }

    //隐藏所有fragment防止显示多个
    private void hideFragments(FragmentTransaction transaction) {
        if(mCloudFragment!=null) {
            transaction.hide(mCloudFragment);
        }
        if(mWarnFragment!=null) {
            transaction.hide(mWarnFragment);
        }
        if(mMyselfFragment!=null) {
            transaction.hide(mMyselfFragment);
        }
    }

上面是核心代码, 具体要切换按钮的状态,自己随意写.