android fragment切换

分手后的思念是犯贱 2023-07-05 07:58 16阅读 0赞

## android fragment切换 ##

## 1、调用方式 ##

xml布局

调用代码

Fragment1 fragment1;
    if(fragment1 == null) { 
        fragment1 = new Fragment1();
    }
    switchFragment(fragment1);

### 2、函数 ###

*  show/add方式，切换后不重载

Fragment currentFragment;
    /** * @method switchFragment * @description fragment切换，切换方式为 show/hide * @date: 2020-02-13 15:50 * @author: ccc * @param fragment * @return void */
        private void switchFragment(Fragment fragment) { 
            //开启fragment事务
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            //判断当前显示的fragment是否为空，不为空则隐藏
            if(currentFragment != null)
                fragmentTransaction.hide(currentFragment);
            //判断需要显示的fragment是否已经添加过，添加过 show 没添加过 add
            if (fragment.isAdded()){ 
                fragmentTransaction.show(fragment);
                System.out.println("is ready add");
            }else{ 
                fragmentTransaction.add(R.id.frame_layout,fragment);
                System.out.println("is not add");
            }
            fragmentTransaction.commit();
            //将当前显示的fragment 赋给 currentFragment
            currentFragment = fragment;
        }

*  replace方式，切换后销毁原fragment

/** * @method switchFragment * @description fragment切换，切换方式为 replace * @date: 2020-02-13 15:50 * @author: ccc * @param fragment * @return void */
          private void switchFragment(Fragment fragment) { 
            //开启fragment事务
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            //切换的时候需重启加载fragment时使用replace
            fragmentTransaction.replace(R.id.frame_layout,fragment).commit();
        }