Android笔记--Fragment获取父Activity的控件并修改内容demo

NO0111

于 2016-09-06 14:56:24 发布

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本文链接：https://blog.youkuaiyun.com/weilexuexia/article/details/52449889

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这篇博客介绍了如何在Android中通过Fragment动态加载并获取父Activity的TextView控件，进而修改其内容。步骤包括在Activity中添加Fragment，Fragment的onAttach()方法中获取TextView引用，以及提供源码下载和接口回调的通信方式参考链接。

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1、首先在Activity里动态加载Fragment,

BlankFragment blankFragment = new BlankFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
beginTransaction.add(R.id.fragmentcontent, blankFragment);
beginTransaction.addToBackStack(null);
beginTransaction.commit();

2、然后在Fragment里的onAttach()方法中获得Activity的Textview控件的引用,

@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
if (activity instanceof MainActivity) {
MainActivity mainActivity = (MainActivity) activity;
textView = (TextView) mainActivity.findViewById(R.id.textView);
}
}