当你在实现Fragment之间的通信时（例如Fragment_A和Fragment_B），可能会想到的方法是在Fragment_B中对外提供一个接口，然后在Fragment_A中去调用这个接口，并把这需要的参数传递过去。
下面我将对利用广播来实现从Fragment_A向Fragment_B传递数据。
主界面：
public class MainActivity extends FragmentActivity { private int getLayoutResID() { return R.layout.activity_main; } private MyViewPagerAdapter mAdapter = null; private final int START_ITEM = 0; private ViewPager mDataViewPager = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(getLayoutResID()); initEvent(); } /** * 初始化事件 */ private void initEvent() { initView(); } /** * 初始化界面 */ private void initView() { initWidgets(); } /** * 初始化控件 */ private void initWidgets() { mDataViewPager = (ViewPager) findViewById(R.id.activity_main_show_viewpager); mAdapter = new MyViewPagerAdapter(getSupportFragmentManager()); mAdapter.setContext(MainActivity.this); mDataViewPager.setAdapter(mAdapter); mDataViewPager.setCurrentItem(START_ITEM); }}适配器：
public class MyViewPagerAdapter extends FragmentStatePagerAdapter { public static final int FRAGMENT_VIEWPAGER_PAGE_COUNT = 2; private Context mContext; public MyViewPagerAdapter(FragmentManager fm) { super(fm); } public void setContext(Context context) { mContext = context; } @Override public Fragment getItem(int which) { try { switch (which) { case 0: return PageOneFragment.newInstance(); case 1: return PageTwoFragment.newInstance(); default: break; } } catch(Exception e) { e.printStackTrace(); } return PageOneFragment.newInstance(); } @Override public int getCount() { return FRAGMENT_VIEWPAGER_PAGE_COUNT; }}第一个Fragment：
public class PageOneFragment extends Fragment { public static PageOneFragment newInstance() { PageOneFragment fragment = new PageOneFragment(); return fragment; } private int getLayoutResID() { return R.layout.fragment_page_0; } public static final String TAG = PageOneFragment.class.getName(); private TextView mShowTextView = null; private Button mSendButton = null; private static final int MESSAGE_UPDATEVIEW = 0x123; private PageTwoDataChangedReceiver mReceiver = null; public static final String DATA_CHANGED = "com.example.viewpager.communication.fragment.PAGE_ONE_DATA_CHANGED"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(getLayoutResID(), container, false); initEvent(view); return view; } private void initEvent(View v) { initView(v); registerPageTwoDataChangedReceiver(); } private void initView(View v) { initWidgets(v); setViewOnclickEvent(); } private void initWidgets(View v) { mShowTextView = (TextView) v.findViewById(R.id.page_0_show_textview); mSendButton = (Button) v.findViewById(R.id.page_0_send_button); } /** * 对所有的按钮进行点击事件监听 */ private void setViewOnclickEvent() { mSendButton.setOnClickListener(viewOnClickListener); } private OnClickListener viewOnClickListener = new OnClickListener() { @Override public void onClick(View v) { switch (v.getId()) { case R.id.page_0_send_button: Intent intent = new Intent(); intent.setAction(PageTwoFragment.DATA_CHANGED); getActivity().sendBroadcast(intent); break; default: break; } } }; private void registerPageTwoDataChangedReceiver() { IntentFilter filter = new IntentFilter(); try { if (mReceiver != null) { getActivity().unregisterReceiver(mReceiver); } } catch (Exception e) { e.printStackTrace(); } mReceiver = new PageTwoDataChangedReceiver(); filter.addAction(PageOneFragment.DATA_CHANGED); getActivity().registerReceiver(mReceiver, filter); } Handler handler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_UPDATEVIEW: updateView((String)msg.obj); break; default: break; } }; }; private void updateView(String data) { mShowTextView.setText("从第二页发来的数据：" + data + " " + System.currentTimeMillis()); } class PageTwoDataChangedReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(PageOneFragment.DATA_CHANGED)) { String label = "TWO Time: "; Message msg = new Message(); msg.what = MESSAGE_UPDATEVIEW; msg.obj = label; handler.sendMessage(msg); } } } @Override public void onDestroy() { if (mReceiver != null) { getActivity().unregisterReceiver(mReceiver); } super.onDestroy(); }}第二个Fragment：
public class PageTwoFragment extends Fragment { public static PageTwoFragment newInstance() { PageTwoFragment fragment = new PageTwoFragment(); return fragment; } private int getLayoutResID() { return R.layout.fragment_page_1; } public static final String TAG = PageTwoFragment.class.getName(); private static final int MESSAGE_UPDATEVIEW = 0x123; private TextView mShowTextView = null; private Button mSendButton = null; private PageOneDataChangedReceiver mReceiver = null; public static final String DATA_CHANGED = "com.example.viewpager.communication.fragment.PAGE_TWO_DATA_CHANGED"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(getLayoutResID(), container, false); initEvent(view); return view; } private void initEvent(View v) { initView(v); registerPageOneDataChangedReceiver(); } private void initView(View v) { initWidgets(v); setViewOnclickEvent(); } private void initWidgets(View v) { mShowTextView = (TextView) v.findViewById(R.id.page_1_show_textview); mSendButton = (Button) v.findViewById(R.id.page_1_send_button); } /** * 对所有的按钮进行点击事件监听 */ private void setViewOnclickEvent() { mSendButton.setOnClickListener(viewOnClickListener); } private OnClickListener viewOnClickListener = new OnClickListener() { @Override public void onClick(View v) { switch (v.getId()) { case R.id.page_1_send_button: Intent intent = new Intent(); intent.setAction(PageOneFragment.DATA_CHANGED); getActivity().sendBroadcast(intent); break; default: break; } } }; private void registerPageOneDataChangedReceiver() { IntentFilter filter = new IntentFilter(); try { if (mReceiver != null) { getActivity().unregisterReceiver(mReceiver); } } catch (Exception e) { e.printStackTrace(); } mReceiver = new PageOneDataChangedReceiver(); filter.addAction(PageTwoFragment.DATA_CHANGED); getActivity().registerReceiver(mReceiver, filter); } Handler handler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_UPDATEVIEW: updateView((String)msg.obj); break; default: break; } }; }; private void updateView(String data) { mShowTextView.setText("从第一页发来的数据：" + data + " " + System.currentTimeMillis()); } class PageOneDataChangedReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(PageTwoFragment.DATA_CHANGED)) { String label = "ONE Time: "; Message msg = new Message(); msg.what = MESSAGE_UPDATEVIEW; msg.obj = label; handler.sendMessage(msg); } } } @Override public void onDestroy() { if (mReceiver != null) { getActivity().unregisterReceiver(mReceiver); } super.onDestroy(); }}工程源码：
布局文件比较简单，这里不再给出。如下为项目源码。
http://download.csdn.net/detail/u013761665/8333283
笔者最新开发的应用连接
http://zhushou.360.cn/detail/index/soft_id/2419729?recrefer=SE_D_%E6%A3%B1%E9%95%9C
http://www.wandoujia.com/apps/com.mastershield.personalstat
