我使用Layer（atlas for UI）SDK开发了一个消息传递功能。 如果实现是w.r.t活动，我可以在UI中看到对话列表，但是在切换到活动中的片段后，UI显示为空。切换到片段是必需的，因为应用程序具有使用ViewPager概念实现的导航选项卡，而消息传递是选项卡之一。 以下是我的文件，如果我在使用片段时丢失任何内容，请告诉我。
public class ConversationListFragment extends Fragment {
private AtlasConversationsRecyclerView mConversationsList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (App.routeLogin(getActivity())) {
if (!getActivity().isFinishing()) getActivity().finish();
}
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_conversations_list, container, false);
mConversationsList = (AtlasConversationsRecyclerView) v.findViewById(R.id.conversations_list);
initializeConversationList();
return v;
}
private void initializeConversationList() {
// Atlas methods
mConversationsList.init(getLayerClient(), getParticipantProvider(), getPicasso())
.setInitialHistoricMessagesToFetch(20)
.setOnConversationClickListener(new AtlasConversationsAdapter.OnConversationClickListener() {
@Override
public void onConversationClick(AtlasConversationsAdapter adapter, Conversation conversation) {
Intent intent = new Intent(getContext(), MessagesListActivity.class);
if (Log.isLoggable(Log.VERBOSE)) {
Log.v("Launching MessagesListActivity with existing conversation ID: " + conversation.getId());
}
intent.putExtra(PushNotificationReceiver.LAYER_CONVERSATION_KEY, conversation.getId());
startActivity(intent);
}
@Override
public boolean onConversationLongClick(AtlasConversationsAdapter adapter, Conversation conversation) {
return false;
}
})
.setOnConversationSwipeListener(new SwipeableItem.OnSwipeListener<Conversation>() {
@Override
public void onSwipe(final Conversation conversation, int direction) {
new AlertDialog.Builder(getContext())
.setMessage(R.string.alert_message_delete_conversation)
.setNegativeButton(R.string.alert_button_cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO: simply update this one conversation
mConversationsList.getAdapter().notifyDataSetChanged();
dialog.dismiss();
}
})
.setPositiveButton(R.string.alert_button_delete, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
conversation.delete(LayerClient.DeletionMode.ALL_PARTICIPANTS);
}
}).show();
}
});
App.getParticipantProvider().registerParticipantListener((AtlasConversationsAdapter) mConversationsList.getAdapter());
}
@Override
public void onResume() {
android.util.Log.i("###", "BaseFragment-onResume");
super.onResume();
LayerClient client = App.getLayerClient();
if (client == null) return;
if (client.isAuthenticated()) {
client.connect();
} else {
client.authenticate();
}
}
protected LayerClient getLayerClient() {
return App.getLayerClient();
}
protected ParticipantProvider getParticipantProvider() {
return App.getParticipantProvider();
}
protected Picasso getPicasso() {
return App.getPicasso();
}
public class ConversationsListActivity extends BaseActivity {
private AtlasConversationsRecyclerView mConversationsList;
public ConversationsListActivity() {
super(R.layout.activity_conversations_list, R.menu.menu_conversations_list, R.string.title_conversations_list, false);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (App.routeLogin(this)) {
if (!isFinishing()) finish();
return;
}
mConversationsList = (AtlasConversationsRecyclerView) findViewById(R.id.conversations_list);
// Atlas methods
mConversationsList.init(getLayerClient(), getParticipantProvider(), getPicasso())
.setInitialHistoricMessagesToFetch(20)
.setOnConversationClickListener(new AtlasConversationsAdapter.OnConversationClickListener() {
@Override
public void onConversationClick(AtlasConversationsAdapter adapter, Conversation conversation) {
Intent intent = new Intent(ConversationsListActivity.this, MessagesListActivity.class);
if (Log.isLoggable(Log.VERBOSE)) {
Log.v("Launching MessagesListActivity with existing conversation ID: " + conversation.getId());
}
intent.putExtra(PushNotificationReceiver.LAYER_CONVERSATION_KEY, conversation.getId());
startActivity(intent);
}
@Override
public boolean onConversationLongClick(AtlasConversationsAdapter adapter, Conversation conversation) {
return false;
}
})
.setOnConversationSwipeListener(new SwipeableItem.OnSwipeListener<Conversation>() {
@Override
public void onSwipe(final Conversation conversation, int direction) {
new AlertDialog.Builder(ConversationsListActivity.this)
.setMessage(R.string.alert_message_delete_conversation)
.setNegativeButton(R.string.alert_button_cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO: simply update this one conversation
mConversationsList.getAdapter().notifyDataSetChanged();
dialog.dismiss();
}
})
.setPositiveButton(R.string.alert_button_delete, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
conversation.delete(LayerClient.DeletionMode.ALL_PARTICIPANTS);
}
}).show();
}
});
App.getParticipantProvider().registerParticipantListener((AtlasConversationsAdapter) mConversationsList.getAdapter());
findViewById(R.id.floating_action_button)
.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(ConversationsListActivity.this, MessagesListActivity.class));
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
return true;
case R.id.action_sendlogs:
LayerClient.sendLogs(getLayerClient(), this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
public abstract class BaseActivity extends AppCompatActivity {
private final int mLayoutResId;
private final int mMenuResId;
private final int mMenuTitleResId;
private final boolean mMenuBackEnabled;
public BaseActivity(int layoutResId, int menuResId, int menuTitleResId, boolean menuBackEnabled) {
mLayoutResId = layoutResId;
mMenuResId = menuResId;
mMenuTitleResId = menuTitleResId;
mMenuBackEnabled = menuBackEnabled;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(mLayoutResId);
ActionBar actionBar = getSupportActionBar();
if (actionBar == null) return;
if (mMenuBackEnabled) actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setTitle(mMenuTitleResId);
}
@Override
public void setTitle(CharSequence title) {
ActionBar actionBar = getSupportActionBar();
if (actionBar == null) {
super.setTitle(title);
} else {
actionBar.setTitle(title);
}
}
@Override
public void setTitle(int titleId) {
ActionBar actionBar = getSupportActionBar();
if (actionBar == null) {
super.setTitle(titleId);
} else {
actionBar.setTitle(titleId);
}
}
@Override
protected void onResume() {
Log.i("###","BaseActivity-onResume");
super.onResume();
LayerClient client = App.getLayerClient();
if (client == null) return;
if (client.isAuthenticated()) {
client.connect();
} else {
client.authenticate();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(mMenuResId, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
// Menu "Navigate Up" acts like hardware back button
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
protected LayerClient getLayerClient() {
return App.getLayerClient();
}
protected ParticipantProvider getParticipantProvider() {
return App.getParticipantProvider();
}
protected Picasso getPicasso() {
return App.getPicasso();
}
}
答案 0 :(得分：1)
经过良好的调试会议后，发现Layer-Atlas SDK有条件可以在恢复时刷新。
public AtlasMessagesRecyclerView refresh() {
if (mAdapter != null) mAdapter.refresh();
return this;
}
所以只需从ConversationListFragment onResume调用refresh方法，就解决了这个问题。
@Override
public void onResume() {
super.onResume();
LayerClient client = App.getLayerClient();
if (client == null) return;
if (client.isAuthenticated()) {
client.connect();
} else {
client.authenticate();
}
mConversationsList.refresh();
}