acvity和fragment通過廣播聯絡，acvityfragment

acvity和fragment通過廣播聯絡，acvityfragment

今天我遇到一個問題，就是在activity中需要動態改變fragment中的控制項，以前看到過可以在activity中得到fragment執行個體，然後修改控制項；

今天實驗了一個新的辦法，通過新的辦法，就是通過本地廣播；

1.在Fragment中編寫廣播接收器

public class ShouYeFragment extends Fragment {    private ListView listView;    private List<BoWen> list=new ArrayList<BoWen>();    private BoWenAdapter adapter;    private WeiBoDataBase weiBoDataBase=WeiBoDataBase.getInstance(getContext());    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        super.onCreateView(inflater, container, savedInstanceState);        View view=inflater.inflate(R.layout.shouye_view,container,false);        listView= (ListView) view.findViewById(R.id.bowen_list);        return view;    }    public List<BoWen> getBoWen(){        List<BoWen> list1=new ArrayList<BoWen>();        List<String> bPhone=weiBoDataBase.getBPhone(MainActivity.getYonghuming());        for (String bphone: bPhone){            for(BoWen boWen:weiBoDataBase.getBoWen(bphone)){                list1.add(boWen);            }        }        return list1;    }    public class ShouYeBroadCastReceiver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            list=getBoWen();            adapter=new BoWenAdapter(getContext(),R.layout.bowen_view,list);            listView.setAdapter(adapter);        }    }}

在activity中註冊發送本地廣播

public class MainActivity extends FragmentActivity {      private ShouYeFragment shouYeFragment;    private FragmentManager manager;    private FragmentTransaction transaction;    private LocalBroadcastManager broadcastManager;    private ShouYeFragment.ShouYeBroadCastReceiver shouYeBroadCastReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main_view);               shouYeFragment=new ShouYeFragment();        manager=getSupportFragmentManager();        broadcastManager = LocalBroadcastManager.getInstance(this);        shouYeBroadCastReceiver=shouYeFragment.new ShouYeBroadCastReceiver();        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction("android.intent.action.ShouYe_BROADCAST");        broadcastManager.registerReceiver(shouYeBroadCastReceiver, intentFilter);        transaction=manager.beginTransaction();        transaction.add(R.id.zhuyaoneirong_layout,shouYeFragment);        transaction.addToBackStack(null);        transaction.commit();        init();    }    private void init(){                            Intent intent1=new Intent("android.intent.action.ShouYe_BROADCAST");                            broadcastManager.sendBroadcast(intent1);                  }    @Override    protected void onDestroy() {        super.onDestroy();        broadcastManager.unregisterReceiver(shouYeBroadCastReceiver);    }}