在Activity中我们可以使用findFragmentById方法来获取一个fragment然后再获取该fragment中的相关控件。

通过一个demo来体现。

MainActivity.java代码如下：

public class MainActivity extends FragmentActivity {

	private FragmentManager manager;
	private MyFragment fragment;
	private Button button;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		/*获取manager*/
		manager = this.getSupportFragmentManager();
		
		/*通过findFragmentById获取Fragment*/
		fragment = (MyFragment) manager.findFragmentById(R.id.fragment1);
		
		/*通过fragment.getView()获取视图，然后在获取fragment中的button*/
		button = (Button) fragment.getView().findViewById(R.id.button1);
		
		/*设置按钮的监听事件*/
		button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				
				Toast.makeText(MainActivity.this, "hello world!!!", 1).show();
			}
		});
	}


}

MyFragment.java代码如下：

public class MyFragment extends Fragment {

	public MyFragment() {
		// TODO Auto-generated constructor stub

	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		
		/* 动态加载视图 */
		View view = inflater.inflate(R.layout.f1, null);
		
		return view;
	}

	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}
}

activity_main.xml代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.fragmentblog2.MyFragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="143dp" />
    
</RelativeLayout>

f1.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

demo结果展示：