Android事件总线将数据从活动传递到选项卡片段

我的程序中有5个标签片段，我想将数据从我的工具栏按钮传递到5个标签片段，但问题是当我点击我的工具栏按钮时它只传递给3个片段，任何人都有想法解决这个问题

主要活动

这是我在MainActivity中的onclick函数

public void editpage( View view) { ToggleButton etMessage = (ToggleButton) findViewById(R.id.toggleButton); Events.ActivityFragmentMessage activityFragmentMessageEvent = new Events.ActivityFragmentMessage(String.valueOf(etMessage.getText())); Events.ActivityFragmentMessage2 activityFragmentMessageEvent2 = new Events.ActivityFragmentMessage2(String.valueOf(etMessage.getText())); Events.ActivityFragmentMessage3 activityFragmentMessageEvent3 = new Events.ActivityFragmentMessage3(String.valueOf(etMessage.getText())); Events.ActivityFragmentMessage4 activityFragmentMessageEvent4 = new Events.ActivityFragmentMessage4(String.valueOf(etMessage.getText())); Events.ActivityFragmentMessage5 activityFragmentMessageEvent5 = new Events.ActivityFragmentMessage5(String.valueOf(etMessage.getText())); GlobalBus.getBus().post(activityFragmentMessageEvent); GlobalBus.getBus().post(activityFragmentMessageEvent2); GlobalBus.getBus().post(activityFragmentMessageEvent3); GlobalBus.getBus().post(activityFragmentMessageEvent4); GlobalBus.getBus().post(activityFragmentMessageEvent5); } 

list_fragment2

这是我在MainActivity上点击切换按钮后收到数据的方式

 @Override public void onStart() { super.onStart(); GlobalBus.getBus().register(this); } @Subscribe public void getMessage(Events.ActivityFragmentMessage activityFragmentMessage) { messageView2 = (TextView) getView().findViewById(R.id.sum2); messageView2.setText(String.valueOf(activityFragmentMessage.getMessage())); messageView2.setText(activityFragmentMessage.getMessage()); i = messageView2.getText().toString(); result = Integer.parseInt(i); if (result == 1) { Nsum[0]++; editor.putInt(PREFS_KEY,Nsum[0]); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(list_fragment2.this).attach(list_fragment2.this).commit(); }else if (result ==0){ editor.remove(PREFS_KEY); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(list_fragment2.this).attach(list_fragment2.this).commit(); } } @Override public void onDestroyView() { super.onDestroyView(); GlobalBus.getBus().unregister(this); } 

orderlist_fragment

  @Override public void onStart() { super.onStart(); GlobalBus.getBus().register(this); } @Subscribe public void getMessage3(Events.ActivityFragmentMessage3 activityFragmentMessage3) { messageView3 = (TextView) getView().findViewById(R.id.sum3); messageView3.setText(String.valueOf(activityFragmentMessage3.getMessage3())); messageView3.setText(activityFragmentMessage3.getMessage3()); i = messageView3.getText().toString(); result = Integer.parseInt(i); if (result == 1) { Nsum[0]++; editor.putInt(PREFS_KEY,Nsum[0]); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(orderlist_fragment.this).attach(orderlist_fragment.this).commit(); }else if (result ==0){ editor.remove(PREFS_KEY); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(orderlist_fragment.this).attach(orderlist_fragment.this).commit(); } } @Override public void onDestroyView() { super.onDestroyView(); GlobalBus.getBus().unregister(this); } 

Tab4_fragment

  @Override public void onStart() { super.onStart(); GlobalBus.getBus().register(this); } @Subscribe public void getMessage(Events.ActivityFragmentMessage4 activityFragmentMessage4) { messageView4 = (TextView) getView().findViewById(R.id.sum4); messageView4.setText(String.valueOf(activityFragmentMessage4.getMessage4())); messageView4.setText(activityFragmentMessage4.getMessage4()); i = messageView4.getText().toString(); result = Integer.parseInt(i); if (result == 1) { Nsum[0]++; editor.putInt(PREFS_KEY,Nsum[0]); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(Tab4_fragment.this).attach(Tab4_fragment.this).commit(); }else if (result ==0){ editor.remove(PREFS_KEY); editor.commit(); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.detach(Tab4_fragment.this).attach(Tab4_fragment.this).commit(); } } @Override public void onDestroyView() { super.onDestroyView(); GlobalBus.getBus().unregister(this); } 

Answer 1

这是因为尚未创建片段4和5。 将setOffscreenPageLimit（5）添加到viewPager实例中。 它会将所有5个片段保留在内存中，而不是使用延迟加载机制。

官方文档链接setOffscreenPageLimit

在空闲状态下，将视图层次结构中当前页面任一侧应保留的页数设置为空闲状态。 超出此限制的页面将在需要时从适配器重新创建。