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Android利用广播实现ViewPager中item之间的数据通信
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
Android利用广播实现ViewPager中item之间的数据通信
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