Add feature flag driven group recommended size and hard size limits.

app/src/main/java/org/thoughtcrime/securesms/components/emoji/WarningTextView.java

@@ -0,0 +1,49 @@
+package org.thoughtcrime.securesms.components.emoji;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+
+import androidx.annotation.ColorInt;
+import androidx.appcompat.widget.AppCompatTextView;
+
+import org.thoughtcrime.securesms.R;
+
+public final class WarningTextView extends AppCompatTextView {
+
+  @ColorInt private final int originalTextColor;
+  @ColorInt private final int warningTextColor;
+
+  private boolean warning;
+
+  public WarningTextView(Context context) {
+    this(context, null);
+  }
+
+  public WarningTextView(Context context, AttributeSet attrs) {
+    this(context, attrs, 0);
+  }
+
+  public WarningTextView(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+
+    TypedArray styledAttributes = context.obtainStyledAttributes(attrs, R.styleable.WarningTextView, 0, 0);
+    warningTextColor = styledAttributes.getColor(R.styleable.WarningTextView_warning_text_color, 0);
+
+    styledAttributes.recycle();
+
+    styledAttributes = context.obtainStyledAttributes(attrs, new int[]{ android.R.attr.textColor });
+
+    originalTextColor = styledAttributes.getColor(0, 0);
+
+    styledAttributes.recycle();
+  }
+
+  public void setWarning(boolean warning) {
+    if (this.warning != warning) {
+      this.warning = warning;
+      setTextColor(warning ? warningTextColor : originalTextColor);
+      invalidate();
+    }
+  }
+}