Fragment加RadioGroup show和hide

最新推荐文章于 2023-10-12 13:22:01 发布

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最新推荐文章于 2023-10-12 13:22:01 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/XiaoZhuang__/article/details/78431328

本文介绍了一个使用Android中Fragment实现内容动态切换的方法。通过MainActivity管理多个Fragment，并利用RadioGroup的选项来控制不同Fragment的显示与隐藏，实现了流畅的用户体验。

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public class MainActivity extends AppCompatActivity {

    private FragmentManager fragmentManager;
    private FrameLayout fl;
    private com.a1511j.day03_fragmentshow_hide.Fragment.f2 f2;
    private com.a1511j.day03_fragmentshow_hide.Fragment.f1 f1;
    private com.a1511j.day03_fragmentshow_hide.Fragment.f3 f3;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取管理者
        fragmentManager = getSupportFragmentManager();
        //初始化组件
        fl = (FrameLayout) findViewById(R.id.fl);
        RadioGroup rg= (RadioGroup) findViewById(R.id.rg);
        //将所有Fragment添加到占位布局
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
         //实例化第一个Frangment
        f1 = new f1();
        fragmentTransaction.add(R.id.fl, f1).commit();
        //RadioGroupd点击监听
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
                //隐藏所有Fragment
                hidefragment();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                switch (i){
                    case R.id.ra1:
                        //展示第一个
                        fragmentTransaction.show(f1).commit();
                        break;
                    case R.id.ra2:
                        //展示第二个
                        if(f2==null){
                            f2=new f2();
                            fragmentTransaction.add(R.id.fl,f2).commit();
                        }else{
                            fragmentTransaction.show(f2).commit();
                        }
                        break;
                    case R.id.ra3:
                        //展示第三个
                        if(f3==null){
                            f3=new f3();
                            fragmentTransaction.add(R.id.fl,f3).commit();
                        }else{
                            fragmentTransaction.show(f3).commit();
                        }
                        break;
                }
            }
        });

    }

    private void hidefragment() {
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //如果Fragment不为空并且已经添加,就隐藏
        if(f1!=null&&f1.isAdded()){
           fragmentTransaction.hide(f1);
        }
        if(f2!=null&&f2.isAdded()){
            fragmentTransaction.hide(f2);
        }
        if(f3!=null&&f3.isAdded()){
            fragmentTransaction.hide(f3);
        }
        //提交
        fragmentTransaction.commit();
    }
}