Android 界面（Fragment）切换

秒速五厘米 2022-05-08 14:08 348阅读 0赞

1.声明

private FragmentManager fManager;//管理Fragment界面

2.初始化

fManager = getSupportFragmentManager();

3.切换代码

/**
         * Fragment切换
         *
         * @param index
         */
        private void setChoiceItem(int index) {
            FragmentTransaction transaction = fManager.beginTransaction();
            clearChoice();
            hideFragments(transaction);
            switch (index) {
                case 0:
                    img_home.setBackgroundResource(R.drawable.home_select);
                    if (home == null) {
                        home = new HomeFragment();
                        transaction.add(R.id.main_frame_layout, home);
                    } else {
                        transaction.show(home);
                    }
    
                    break;
    
                case 1:
                    img_message.setBackgroundResource(R.drawable.message_select);
                    if (message == null) {
                        message = new MessageFragment();
                        transaction.add(R.id.main_frame_layout, message);
                    } else {
                        transaction.show(message);
                    }
                    break;
                case 2:
                    img_attention.setBackgroundResource(R.drawable.attention_select);
                    if (attention == null) {
                        attention = new AttentionFragment();
                        transaction.add(R.id.main_frame_layout, attention);
                    } else {
                        transaction.show(attention);
                    }
                    break;
                case 3:
                    img_mine.setBackgroundResource(R.drawable.mine_select);
                    if (mine == null) {
                        mine = new MineFragment();
                        transaction.add(R.id.main_frame_layout, mine);
                    } else {
                        transaction.show(mine);
                    }
                    break;
            }
            transaction.commit();
        }

4.隐藏

/**
         * 隐藏片段
         *
         * @param transaction
         */
        private void hideFragments(FragmentTransaction transaction) {
            if (home != null) {
                transaction.hide(home);
            }
            if (message != null) {
                transaction.hide(message);
            }
            if (attention != null) {
                transaction.hide(attention);
            }
            if (mine != null) {
                transaction.hide(mine);
            }
        }

5.清除选中样式

/**
         * 清除选中Fragment的样式
         */
        public void clearChoice() {
            img_home.setBackgroundResource(R.drawable.home_unselect);
            img_message.setBackgroundResource(R.drawable.message_unselect);
            img_attention.setBackgroundResource(R.drawable.attention_unselect);
            img_mine.setBackgroundResource(R.drawable.mine_unselect);
        }