improvements

app/src/main/java/app/fedilab/android/MainApplication.java

@@ -41,7 +41,7 @@ public class MainApplication extends MultiDexApplication {
 
 
     private static MainApplication app;
-
+    private WebView webView;
     public static MainApplication getApp() {
         return app;
     }
@@ -52,10 +52,9 @@ public class MainApplication extends MultiDexApplication {
         app = this;
         SharedPreferences sharedpreferences = PreferenceManager.getDefaultSharedPreferences(MainApplication.this);
         try {
-            new WebView(this);
+            webView = new WebView(this);
         } catch (Exception ignored) {
         }
-
         boolean dynamicColor = sharedpreferences.getBoolean(getString(R.string.SET_DYNAMICCOLOR), false);
         if (dynamicColor) {
             DynamicColors.applyToActivitiesIfAvailable(this);
@@ -63,6 +62,12 @@ public class MainApplication extends MultiDexApplication {
         StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
         StrictMode.setVmPolicy(builder.build());
         Toasty.Config.getInstance().apply();
+        if (webView != null) {
+            try {
+                webView.destroy();
+            } catch (Exception ignored) {
+            }
+        }
     }
 
 

app/src/main/java/app/fedilab/android/client/entities/api/Status.java

@@ -117,6 +117,7 @@ public class Status implements Serializable, Cloneable {
     public boolean isChecked = false;
     public String translationContent;
     public boolean translationShown;
+    public boolean mathsShown = false;
     public boolean canLoadMedia = false;
     public transient boolean isFocused = false;
     public transient boolean setCursorToEnd = false;

app/src/main/java/app/fedilab/android/helper/Helper.java

@@ -327,7 +327,7 @@ public class Helper {
     public static final Pattern groupPattern = Pattern.compile("(![\\w_]+)");
     public static final Pattern mentionPattern = Pattern.compile("(@[\\w_.-]?[\\w]+)");
     public static final Pattern mentionLongPattern = Pattern.compile("(@[\\w_.-]+@[a-zA-Z0-9][a-zA-Z0-9.-]{1,61}[a-zA-Z0-9](?:\\.[a-zA-Z]{2,})+)");
-    public static final Pattern mathsPattern = Pattern.compile("\\\\\\(");
+    public static final Pattern mathsPattern = Pattern.compile("\\\\\\(|\\\\\\{|\\\\\\[");
     public static final Pattern twitterPattern = Pattern.compile("((@[\\w]+)@twitter\\.com)");
     public static final Pattern youtubePattern = Pattern.compile("(www\\.|m\\.)?(youtube\\.com|youtu\\.be|youtube-nocookie\\.com)/(((?!([\"'<])).)*)");
     public static final Pattern nitterPattern = Pattern.compile("(mobile\\.|www\\.)?twitter.com([\\w-/]+)");

app/src/main/java/app/fedilab/android/ui/drawer/StatusAdapter.java

@@ -644,6 +644,7 @@ public class StatusAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
         if (status.isMaths == null) {
             if (Helper.mathsPattern.matcher(status.content).find()) {
                 holder.binding.actionButtonMaths.setVisibility(View.VISIBLE);
+                status.isMaths = true;
             } else {
                 holder.binding.actionButtonMaths.setVisibility(View.GONE);
             }
@@ -654,10 +655,17 @@ public class StatusAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
                 holder.binding.actionButtonMaths.setVisibility(View.GONE);
             }
         }
-        holder.binding.actionButtonMaths.setOnClickListener(v -> {
+        if (status.mathsShown) {
-            if (holder.binding.statusContentMaths.getVisibility() == View.VISIBLE) {
+            holder.binding.statusContentMaths.setVisibility(View.VISIBLE);
+            holder.binding.statusContent.setVisibility(View.GONE);
+        } else {
             holder.binding.statusContentMaths.setVisibility(View.GONE);
             holder.binding.statusContent.setVisibility(View.VISIBLE);
+        }
+        holder.binding.actionButtonMaths.setOnClickListener(v -> {
+
+            if (status.mathsShown) {
+                status.mathsShown = false;
             } else {
                 holder.binding.statusContentMaths.removeAllViews();
                 MathJaxConfig mathJaxConfig = new MathJaxConfig();
@@ -669,12 +677,12 @@ public class StatusAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
                         mathJaxConfig.setTextColor("dark");
                         break;
                 }
+                status.mathsShown = true;
                 MathJaxView mathview = new MathJaxView(context, mathJaxConfig);
                 holder.binding.statusContentMaths.addView(mathview);
                 mathview.setInputText(status.contentSpan.toString());
-                holder.binding.statusContentMaths.setVisibility(View.VISIBLE);
-                holder.binding.statusContent.setVisibility(View.GONE);
             }
+            adapter.notifyItemChanged(holder.getBindingAdapterPosition());
         });
         holder.binding.actionButtonFavorite.setActiveImage(R.drawable.ic_round_star_24);
         holder.binding.actionButtonFavorite.setInactiveImage(R.drawable.ic_round_star_border_24);
@@ -1305,7 +1313,9 @@ public class StatusAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
             if (statusToDeal.content.trim().length() == 0) {
                 holder.binding.mediaContainer.setVisibility(View.GONE);
             } else {
+                if (!status.mathsShown) {
                     holder.binding.statusContent.setVisibility(View.VISIBLE);
+                }
                 if (statusToDeal.card != null && statusToDeal.quote_id == null && (display_card || statusToDeal.isFocused)) {
                     holder.binding.card.setVisibility(View.VISIBLE);
                 } else {

mathjaxandroid/src/main/java/de/timfreiheit/mathjax/android/MathJaxView.java

@@ -9,13 +9,17 @@ import android.os.Handler;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.Gravity;
+import android.view.MotionEvent;
 import android.view.View;
+import android.view.ViewConfiguration;
 import android.view.ViewGroup;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.FrameLayout;
 
+import java.util.concurrent.atomic.AtomicReference;
+
 
 /**
  * Containerview for an WebView which renders LaTex using MathJax
@@ -148,6 +152,32 @@ public class MathJaxView extends FrameLayout {
         mWebView.setVerticalScrollBarEnabled(verticalScrollbarsEnabled);
         mWebView.setHorizontalScrollBarEnabled(horizontalScrollbarsEnabled);
         mWebView.setBackgroundColor(0);
+        mWebView.getSettings().setLoadWithOverviewMode(true);
+        float touchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
+        final boolean[] scrollFlag = {true};
+        AtomicReference<Float> downX = new AtomicReference<>((float) 0);
+        AtomicReference<Float> downY = new AtomicReference<>((float) 0);
+        mWebView.setOnTouchListener((View v, MotionEvent event) -> {
+            if (!scrollFlag[0] && event.getY() < getHeight() / 2) {
+
+                switch (event.getAction()) {
+                    case MotionEvent.ACTION_DOWN:
+                        downX.set(event.getX());
+                        downY.set(event.getY());
+                        break;
+                    case MotionEvent.ACTION_MOVE:
+                        if (Math.abs(event.getY() - downY.get()) < touchSlop && Math.abs(event.getX() - downX.get()) > touchSlop) {
+                            getParent().requestDisallowInterceptTouchEvent(true);
+                            scrollFlag[0] = true;
+                        }
+                        break;
+                }
+            }
+            if (event.getAction() == MotionEvent.ACTION_UP)
+                scrollFlag[0] = false;
+
+            return false;
+        });
     }
 
     /**