Frammento attività di cattura onKeyDown e l'uso in frammento

Question

devo attività Frammento con cercapersone:

List<Fragment> fragments = new Vector<Fragment>(); 
    fragments.add(Fragment.instantiate(this, PastEventListFragment.class.getName(),bundle)); 
    fragments.add(Fragment.instantiate(this, EventListFragment.class.getName(),bundle)); 

    this.mPagerAdapter = new EventPagerAdapter(super.getSupportFragmentManager(), fragments); 
    // 
    ViewPager pager = (ViewPager)super.findViewById(R.id.viewpager1); 

    pager.setAdapter(this.mPagerAdapter); 
    pager.setCurrentItem(1); 

prendo evento onKeyDown:

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_MENU) { 

    } 
    return super.onKeyDown(keyCode, event); 
} 

La domanda è: Come utilizzare evento in tutti i frammenti i hanno istanziato in questa attività. Grazie

Answer 1

Quello che puoi fare è definire un metodo personalizzato nelle tue classi di frammenti. Ad esempio:

public void myOnKeyDown(int key_code){ 
    //do whatever you want here 
} 

e chiamare questo metodo ogni volta che viene generato un evento key-down nella classe Attività. Per esempio:

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_MENU) { 
     ((PastEventListFragment)fragments.get(0)).myOnKeyDown(keyCode); 
     ((EventListFragment)fragments.get(1)).myOnKeyDown(keyCode); 

     //and so on... 
    } 
    return super.onKeyDown(keyCode, event); 
} 

Answer 2

Se qualcuno è interessed come farlo con boradcast:

Nel vostro frammento in onViewCreated

@Override 
public void onViewCreated(View view, Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 


// Register to receive messages. 
// We are registering an observer (mMessageReceiver) to receive Intents 
// with actions named "custom-event-name". 
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, 
new IntentFilter("activity-says-hi")); 

...} 

// Our handler for received Intents. This will be called whenever an Intent 
// with an action named "custom-event-name" is broadcasted. 
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() { 
@Override 
public void onReceive(Context context, Intent intent) { 
// Get extra data included in the Intent 

doSomethingCauseVolumeKeyPressed(); 

} 
}; 

tuo KeyEvent - codice per mettere in attività

@Override 
public boolean dispatchKeyEvent(KeyEvent event) { 
    int action = event.getAction(); 
    int keyCode = event.getKeyCode(); 
    switch (keyCode) { 
     case KeyEvent.KEYCODE_VOLUME_UP: 
      if (action == KeyEvent.ACTION_DOWN) { 
       sendBroadcast(); 
      } 
      return true; 
     case KeyEvent.KEYCODE_VOLUME_DOWN: 
      if (action == KeyEvent.ACTION_DOWN) { 
       sendBroadcast(); 
      } 
      return true; 
     default: 
      return super.dispatchKeyEvent(event); 
    } 
} 

il mittente della trasmissione:

private void sendVolumeBroadcast(){ 
    Intent intent = new Intent("activity-says-hi"); 
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent); 
} 

Answer 3

Ho suddiviso le classi Attività e Frammento per eseguire il passaggio di KeyEvents. Per me, sembra più chiaro rispetto all'invio di trasmissioni locali. Ma questa soluzione non può essere così flessibile. Scegli il modo preferito da solo.

Qui è l'attività:

public abstract class KeyEventPassingActivity extends Activity { 

    public interface KeyEventListener extends View.OnKeyListener { 
     boolean isVisible(); 
     View getView(); 
    } 

    private final List<KeyEventListener> keyEventHandlerList = new ArrayList<>(); 

    @Override 
    public boolean dispatchKeyEvent(KeyEvent event) { 
     for (KeyEventListener handler : keyEventHandlerList) { 
      if (handleKeyEvent(handler, event)) { 
       return true; 
      } 
     } 
     return super.dispatchKeyEvent(event); 
    } 

    void addKeyEventHandler(@NonNull KeyEventListener handler) { 
     keyEventHandlerList.add(handler); 
    } 

    void removeKeyEventHandler(@NonNull KeyEventListener handler) { 
     keyEventHandlerList.remove(handler); 
    } 

    /** 
    * @return <tt>true</tt> if the event was handled, <tt>false</tt> otherwise 
    */ 
    private boolean handleKeyEvent(@Nullable KeyEventListener listener, KeyEvent event) { 
     return listener != null 
       && listener.isVisible() 
       && listener.onKey(listener.getView(), event.getKeyCode(), event); 
    } 
} 

e il frammento:

public abstract class KeyEventHandlingFragment extends Fragment 
     implements KeyEventPassingActivity.KeyEventListener { 

    @SuppressWarnings("deprecation") 
    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     if (activity instanceof KeyEventPassingActivity) { 
      ((KeyEventPassingActivity) activity).addKeyEventHandler(this); 
     } 
    } 

    @Override 
    public void onDetach() { 
     Activity activity = getActivity(); 
     if (activity instanceof KeyEventPassingActivity) { 
      ((KeyEventPassingActivity) activity).removeKeyEventHandler(this); 
     } 
     super.onDetach(); 
    } 
} 

Gist: https://gist.github.com/0neel/7d1ed5d26f2148b4168b6616337159ed