Fragment之间的通信

两个单独的Fragment之间是不应该进行通信的。应该使用他们所存在的Activity作为沟通的纽带。

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Activity中可以获得Fragment的管理器

//获得Fragment的管理器  
FragmentManager manager = this.getFragmentManager();

//使用findFragmentById获得Fragment的id
SecondFragment second = (SecondFragment) manager
		.findFragmentById(R.id.secondFragment);

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Fragment中可以获得可以获得自己的Activity

//Fragment可以获得Activity,调用Activity的的方法
		MainActivity ac = (MainActivity) this.getActivity();

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效果图:

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点击左边的Fragment修改右边的Fragment

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左边的Fragment的xml

<?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:background="#cc00cc"
    android:orientation="horizontal" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

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2,右边的Fragment

<?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:background="#cc0000"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="我是一个文本" />

</LinearLayout>

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3,操作左边xml文件的java类

public class FirstFragment extends Fragment implements OnItemClickListener {

	private ListView listView;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		View view = inflater.inflate(R.layout.first_fragment, container, true);

		listView = (ListView) view.findViewById(R.id.listView);

		String[] items = { "语言和输入", "亮度", "存储", "网络" };
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(
				this.getActivity(),
				android.R.layout.simple_expandable_list_item_1, items);
		listView.setAdapter(adapter);

		listView.setOnItemClickListener(this);
		return view;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		// 获得被点击的条目文本
		String str = (String) parent.getAdapter().getItem(position);
      //Fragment可以获得Activity,调用Activity的的方法
		MainActivity ac = (MainActivity) this.getActivity();
		ac.change(str);

	}

}

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3, SecondFragment 的类操作右边的xml

public class SecondFragment extends Fragment {

	private TextView tView;
	static String TAG = "AC";

	@Override
	public void onAttach(Activity activity) {
		Log.i(TAG, "---------------->onAttach");
		super.onAttach(activity);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		Log.i(TAG, "---------------->onCreate");
		super.onCreate(savedInstanceState);
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		Log.i(TAG, "---------------->onActivityCreated");
		super.onActivityCreated(savedInstanceState);
	}

	@Override
	public void onStart() {
		Log.i(TAG, "---------------->onStart");
		super.onStart();
	}

	@Override
	public void onResume() {
		Log.i(TAG, "---------------->onResume");
		super.onResume();
	}

	@Override
	public void onPause() {
		Log.i(TAG, "---------------->onPause");
		super.onPause();
	}

	@Override
	public void onStop() {
		Log.i(TAG, "---------------->onStop");
		super.onStop();
	}

	@Override
	public void onDestroyView() {
		Log.i(TAG, "---------------->onDestroyView");
		super.onDestroyView();
	}

	@Override
	public void onDestroy() {
		Log.i(TAG, "---------------->onDestroy");
		super.onDestroy();
	}

	@Override
	public void onDetach() {
		Log.i(TAG, "---------------->onDetach");
		super.onDetach();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		Log.i(TAG, "---------------->onCreateView");
		View view = inflater
				.inflate(R.layout.second_fragment, container, false);

		tView = (TextView) view.findViewById(R.id.text);

		return view;
	}

	public TextView gettView() {
		return tView;
	}

}

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4,定义主配置的xml文件 定义成fragment的组件

<LinearLayout 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:orientation="horizontal"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/firstFragment"
        android:name="com.example.fragmant.FirstFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <fragment
        android:id="@+id/secondFragment"
        android:name="com.example.fragmant.SecondFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"  />

</LinearLayout>

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5,MainActivity 操作文件

public class MainActivity extends Activity {

	static String TAG = "AC";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		Log.i(TAG, "onCreate");
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

	}

	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	//改变Fragment的方法 使用findFragmentById获得Fragment的id
	public void change(String msg) {
		//获得Fragment的管理器  
		FragmentManager manager = this.getFragmentManager();
		//使用findFragmentById获得Fragment的id
		SecondFragment second = (SecondFragment) manager
				.findFragmentById(R.id.secondFragment);
        //改变第二个Fragment的值 
		second.gettView().setText(msg);
	}

}

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Fragment之间的通信

原文：http://baihe747.iteye.com/blog/2178215