Fragment用handler向Activity发送消息并调用Activity的Handler.Callback

最新推荐文章于 2024-04-11 17:00:00 发布

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最新推荐文章于 2024-04-11 17:00:00 发布 · 1k 阅读

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文章标签：

#handler #Handler.Callback

该博客介绍了如何在Fragment中使用Handler向Activity发送消息，实现Fragment01的隐藏和Fragment02的显示。点击Fragment01中的按钮，通过Handler和Handler.Callback进行通信，完成界面动态更新。

Fragment01中布局一个按钮。点击改按钮向Activity发送消息：隐藏Fragment01,显示Fragment02.

public class MainActivity extends AppCompatActivity implements Handler.Callback{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.add(R.id.fragment01,new Fragment01(),"currentFragment");
        ft.commit();
    }

    @Override
    public boolean handleMessage(Message msg) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction ft = fragmentManager.beginTransaction();
        if (msg.what==1){
            ft.hide(fragmentManager.findFragmentByTag("currentFragment"));
            ft.add(R.id.fragment01,new Fragment02());
            ft.commit();
        }
        return false;
    }
}