fix:dismiss soft keyboard on pressing submit button in server url fragment

app/src/main/java/chat/rocket/android/fragment/add_server/InputHostnameFragment.java

@@ -6,6 +6,7 @@ import android.support.annotation.Nullable;
 import android.support.constraint.ConstraintLayout;
 import android.support.design.widget.Snackbar;
 import android.view.View;
+import android.view.inputmethod.InputMethodManager;
 import android.widget.TextView;
 
 import chat.rocket.android.BuildConfig;
@@ -21,90 +22,99 @@ import chat.rocket.android.service.ConnectivityManager;
  */
 public class InputHostnameFragment extends AbstractFragment implements InputHostnameContract.View {
 
-  private InputHostnameContract.Presenter presenter;
-  private ConstraintLayout container;
-  private View waitingView;
-
-  public InputHostnameFragment() {}
-
-  @Override
-  public void onCreate(@Nullable Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-
-    Context appContext = getContext().getApplicationContext();
-    presenter = new InputHostnamePresenter(new RocketChatCache(appContext), ConnectivityManager.getInstance(appContext));
-  }
-
-  @Override
-  protected int getLayout() {
-    return R.layout.fragment_input_hostname;
-  }
-
-  @Override
-  protected void onSetupView() {
-    setupVersionInfo();
-
-    container = rootView.findViewById(R.id.container);
-    waitingView = rootView.findViewById(R.id.waiting);
-    rootView.findViewById(R.id.btn_connect).setOnClickListener(view -> handleConnect());
-  }
-
-  private void setupVersionInfo() {
-    TextView versionInfoView = (TextView) rootView.findViewById(R.id.version_info);
-    versionInfoView.setText(getString(R.string.version_info_text, BuildConfig.VERSION_NAME));
-  }
-
-  private void handleConnect() {
-    presenter.connectTo(getHostname());
-  }
-
-  @Override
-  public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
-    super.onViewCreated(view, savedInstanceState);
-    presenter.bindView(this);
-  }
-
-  @Override
-  public void onDestroyView() {
-    presenter.release();
-    super.onDestroyView();
-  }
-
-  private String getHostname() {
-    final TextView editor = (TextView) rootView.findViewById(R.id.editor_hostname);
-
-    return TextUtils.or(TextUtils.or(editor.getText(), editor.getHint()), "").toString().toLowerCase();
-  }
-
-  private void showError(String errString) {
-    Snackbar.make(rootView, errString, Snackbar.LENGTH_LONG).show();
-  }
-
-  @Override
-  public void showLoader() {
-    container.setVisibility(View.GONE);
-    waitingView.setVisibility(View.VISIBLE);
-  }
-
-  @Override
-  public void hideLoader() {
-    waitingView.setVisibility(View.GONE);
-    container.setVisibility(View.VISIBLE);
-  }
-
-  @Override
-  public void showInvalidServerError() {
-    showError(getString(R.string.input_hostname_invalid_server_message));
-  }
-
-  @Override
-  public void showConnectionError() {
-    showError(getString(R.string.connection_error_try_later));
-  }
-
-  @Override
-  public void showHome() {
-    LaunchUtil.showMainActivity(getContext());
-    getActivity().overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
-  }
+    private InputHostnameContract.Presenter presenter;
+    private ConstraintLayout container;
+    private View waitingView;
+
+    public InputHostnameFragment() {
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        Context appContext = getContext().getApplicationContext();
+        presenter = new InputHostnamePresenter(new RocketChatCache(appContext), ConnectivityManager.getInstance(appContext));
+    }
+
+    @Override
+    protected int getLayout() {
+        return R.layout.fragment_input_hostname;
+    }
+
+    @Override
+    protected void onSetupView() {
+        setupVersionInfo();
+
+        container = rootView.findViewById(R.id.container);
+        waitingView = rootView.findViewById(R.id.waiting);
+        rootView.findViewById(R.id.btn_connect).setOnClickListener(view -> handleConnect());
+    }
+
+    private void setupVersionInfo() {
+        TextView versionInfoView = (TextView) rootView.findViewById(R.id.version_info);
+        versionInfoView.setText(getString(R.string.version_info_text, BuildConfig.VERSION_NAME));
+    }
+
+    private void handleConnect() {
+        hideSoftKeyboard();
+        presenter.connectTo(getHostname());
+    }
+
+    private void hideSoftKeyboard() {
+        InputMethodManager inputManager = (InputMethodManager)
+                getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
+        inputManager.hideSoftInputFromWindow(getActivity().getCurrentFocus().getWindowToken(),
+                InputMethodManager.HIDE_NOT_ALWAYS);
+    }
+
+    @Override
+    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        presenter.bindView(this);
+    }
+
+    @Override
+    public void onDestroyView() {
+        presenter.release();
+        super.onDestroyView();
+    }
+
+    private String getHostname() {
+        final TextView editor = (TextView) rootView.findViewById(R.id.editor_hostname);
+
+        return TextUtils.or(TextUtils.or(editor.getText(), editor.getHint()), "").toString().toLowerCase();
+    }
+
+    private void showError(String errString) {
+        Snackbar.make(rootView, errString, Snackbar.LENGTH_LONG).show();
+    }
+
+    @Override
+    public void showLoader() {
+        container.setVisibility(View.GONE);
+        waitingView.setVisibility(View.VISIBLE);
+    }
+
+    @Override
+    public void hideLoader() {
+        waitingView.setVisibility(View.GONE);
+        container.setVisibility(View.VISIBLE);
+    }
+
+    @Override
+    public void showInvalidServerError() {
+        showError(getString(R.string.input_hostname_invalid_server_message));
+    }
+
+    @Override
+    public void showConnectionError() {
+        showError(getString(R.string.connection_error_try_later));
+    }
+
+    @Override
+    public void showHome() {
+        LaunchUtil.showMainActivity(getContext());
+        getActivity().overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
+    }
 }