fix lost text when turn off then turn on screen, hide keyboard when change room chat

app/src/main/java/chat/rocket/android/activity/AbstractAuthedActivity.java

@@ -36,6 +36,10 @@ abstract class AbstractAuthedActivity extends AbstractFragmentActivity {
     if (savedInstanceState == null) {
       handleIntent(getIntent());
     }
+    ConnectivityManager.getInstance(getApplicationContext()).keepAliveServer();
+
+    updateHostnameIfNeeded(rocketChatCache.getSelectedServerHostname());
+    updateRoomIdIfNeeded(rocketChatCache.getSelectedRoomId());
   }
 
   @Override
@@ -148,10 +152,6 @@ abstract class AbstractAuthedActivity extends AbstractFragmentActivity {
   @Override
   protected void onResume() {
     super.onResume();
-    ConnectivityManager.getInstance(getApplicationContext()).keepAliveServer();
-
-    updateHostnameIfNeeded(rocketChatCache.getSelectedServerHostname());
-    updateRoomIdIfNeeded(rocketChatCache.getSelectedRoomId());
 
     subscribeToConfigChanges();
   }

app/src/main/java/chat/rocket/android/activity/MainActivity.java

@@ -15,6 +15,7 @@ import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.fragment.chatroom.HomeFragment;
 import chat.rocket.android.fragment.chatroom.RoomFragment;
 import chat.rocket.android.fragment.sidebar.SidebarMainFragment;
+import chat.rocket.android.helper.KeyboardHelper;
 import chat.rocket.core.interactors.CanCreateRoomInteractor;
 import chat.rocket.core.interactors.RoomInteractor;
 import chat.rocket.core.interactors.SessionInteractor;
@@ -51,7 +52,7 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
   @Override
   protected void onPause() {
     if (presenter != null) {
-      presenter.release();
+//      presenter.release();
     }
 
     super.onPause();
@@ -172,6 +173,8 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
   public void showRoom(String hostname, String roomId) {
     showFragment(RoomFragment.create(hostname, roomId));
     closeSidebarIfNeeded();
+    //TODO: Hide keyboard
+    KeyboardHelper.hideSoftKeyboard(this);
   }
 
   @Override

app/src/main/java/chat/rocket/android/helper/KeyboardHelper.java

+package chat.rocket.android.helper;
+
+import android.app.Activity;
+import android.content.Context;
+import android.view.View;
+import android.view.inputmethod.InputMethodManager;
+
+public class KeyboardHelper {
+  public static void hideSoftKeyboard(Activity activity) {
+    if (activity.getCurrentFocus() != null) {
+      InputMethodManager inputMethodManager = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
+      inputMethodManager.hideSoftInputFromWindow(activity.getCurrentFocus().getWindowToken(), 0);
+    }
+  }
+
+  public static void showSoftKeyboard(View view) {
+    InputMethodManager inputMethodManager = (InputMethodManager) view.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+    view.requestFocus();
+    inputMethodManager.showSoftInput(view, 0);
+  }
+
+  public static void toggleKeyBoard(Context context) {
+    InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
+    inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
+  }
+}