如何访问片段的父活动内的碎片的孩子的意见？ [英] How to access Fragment's child views inside fragment's parent Activity?

问题描述

我有一个支持的片段活动将加载差异片段。该片段有一些的TextView 与 ID =分数，我想获得它的句柄，但 findViewById 为得分的的TextView 返回null。为什么会这样？

TextView的放置在片段

 公共类MyActivity延伸扩展ActionBarActivity
        实现NavigationDrawerFragment.NavigationDrawerCallbacks {

   私人TextView的scoreBoardTextView = NULL;

   保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
     的setContentView（R.layout.activity_home）;
     mNavigationDrawerFragment =（NavigationDrawerFragment）
                。getSupportFragmentManager（）findFragmentById（R.id.navigation_drawer）;
     scoreBoardTextView =（TextView中）findViewById（R.id.score）; //这个返回null
  }

    @覆盖
    公共无效onNavigationDrawerItemSelected（INT位置）{
      //设置片段
    }

}
 

解决方案

如果您要访问的的TextView 片段其父在活动，那么你应该定义你的片段类中的方法是这样的：

MyFragment.java

 公共类MyFragment扩展片段{

    TextView的mTextView;

    @覆盖
    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，
        捆绑savedInstanceState）{
        查看查看= inflater.inflate（R.layout.activity_main，集装箱，假）;
        mTextView =（TextView中）view.findViewById（R.id.textView1）;
        返回查看;
    }

    公共无效setTextViewText（字符串值）{
        mTextView.setText（值）;
    }


}
 

现在你可以使用这个你的活动里面是这样的：

  myFragment.setTextViewText（富）;
 

在这里myFragment的类型是 MyFragment 。

如果您要访问的整个的TextView ，那么你可以定义在 MyFragment.java 这样的方法：

 公开的TextView getTextView1（）{
    返回mTextView;
}
 

通过这一点，你可以访问的TextView 本身。

希望这有助于。 ：）

I have a supported fragment activity which will load diff fragments. The fragment has some textView with id = "score" and I want to get its handle but findViewById for score's textView returns null. Why so?

textView is placed in fragment

public class MyActivity extends  extends ActionBarActivity
        implements NavigationDrawerFragment.NavigationDrawerCallbacks{

   private TextView scoreBoardTextView = null;

   protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_home);
     mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
     scoreBoardTextView = (TextView) findViewById(R.id.score); //this returns null
  }

    @Override
    public void onNavigationDrawerItemSelected(int position) {
      //set fragment    
    }

}

解决方案

If you want to access the TextView of Fragment inside its parent Activity then you should define a method inside your Fragment class like this:

MyFragment.java

public class MyFragment extends Fragment {

    TextView mTextView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_main, container, false);
        mTextView = (TextView) view.findViewById(R.id.textView1);
        return view;
    }

    public void setTextViewText(String value){
        mTextView.setText(value);
    }


}

Now you can use this inside your Activity like this:

myFragment.setTextViewText("foo");

here myFragment is of type MyFragment.

If you want to access the whole TextView then you can define a method like this inside MyFragment.java:

public TextView getTextView1(){
    return mTextView;
}

By this you can access the TextView itself.

Hope this Helps. :)

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