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Code Releases Activity

Improved code to handle HTML lists

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This commit is contained in:
Christophe Beyls 2016-12-12 19:32:05 +01:00
parent d24a9dd5a9
commit 1c7f29d17c
2 changed files with 47 additions and 38 deletions
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4
app/src/main/java/be/digitalia/fosdem/fragments/EventDetailsFragment.java
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@ -174,7 +174,7 @@ public class EventDetailsFragment extends Fragment {
if (TextUtils.isEmpty(text)) {
textView.setVisibility(View.GONE);
} else {
textView.setText(StringUtils.parseHtml(text));
textView.setText(StringUtils.parseHtml(text, getResources()));
textView.setMovementMethod(linkMovementMethod);
}
textView = (TextView) view.findViewById(R.id.description);
@ -182,7 +182,7 @@ public class EventDetailsFragment extends Fragment {
if (TextUtils.isEmpty(text)) {
textView.setVisibility(View.GONE);
} else {
textView.setText(StringUtils.parseHtml(text));
textView.setText(StringUtils.parseHtml(text, getResources()));
textView.setMovementMethod(linkMovementMethod);
}

81
app/src/main/java/be/digitalia/fosdem/utils/StringUtils.java
View file

@ -1,7 +1,12 @@
package be.digitalia.fosdem.utils;
import android.content.res.Resources;
import android.support.v4.util.CircularIntArray;
import android.text.Editable;
import android.text.Html;
import android.text.Spanned;
import android.text.style.BulletSpan;
import android.text.style.LeadingMarginSpan;
import org.xml.sax.XMLReader;
@ -94,8 +99,8 @@ public class StringUtils {
return trimEnd(Html.fromHtml(html)).toString();
}
public static CharSequence parseHtml(String html) {
return trimEnd(Html.fromHtml(html, null, new ListsTagHandler()));
public static CharSequence parseHtml(String html, Resources res) {
return trimEnd(Html.fromHtml(html, null, new ListsTagHandler(res)));
}
public static CharSequence trimEnd(CharSequence source) {
@ -133,10 +138,32 @@ public class StringUtils {
static class ListsTagHandler implements Html.TagHandler {
private int level = 0;
private int liStart = -1;
private static final float LEADING_MARGIN_DIPS = 2f;
private static final float BULLET_GAP_WIDTH_DIPS = 8f;
private static void trimStart(final int start, Editable output) {
private final CircularIntArray liStarts = new CircularIntArray(4);
private final int leadingMargin;
private final int bulletGapWidth;
public ListsTagHandler(Resources res) {
final float density = res.getDisplayMetrics().density;
leadingMargin = (int) (density * LEADING_MARGIN_DIPS + 0.5f);
bulletGapWidth = (int) (density * BULLET_GAP_WIDTH_DIPS + 0.5f);
}
/**
* @return final output length
*/
private static int ensureParagraphBoundary(Editable output) {
int length = output.length();
if ((length != 0) && output.charAt(length - 1) != '\n') {
output.insert(length, "\n");
length++;
}
return length;
}
private static void trimStart(Editable output, final int start) {
int end = start;
final int length = output.length();
while ((end < length) && Character.isWhitespace(output.charAt(end))) {
@ -147,43 +174,25 @@ public class StringUtils {
}
}
private static void trimEnd(Editable output) {
final int end = output.length();
int start = end - 1;
while ((start >= 0) && Character.isWhitespace(output.charAt(start))) {
start--;
}
start++;
if (start < end) {
output.delete(start, end);
}
}
@Override
public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
switch (tag) {
case "pre":
case "PRE":
ensureParagraphBoundary(output);
break;
// Unfortunately the following code will be ignored in API 24+ and the native rendering is inferior
case "li":
case "LI":
if (liStart != -1) {
trimStart(liStart, output);
}
if (opening) {
level++;
for (int i = 0; i < level; ++i) {
output.append('\t');
}
output.append("• ");
liStart = output.length();
} else {
level--;
trimEnd(output);
output.append('\n');
if (liStart == -1) {
// End of list; moving one level up
output.append('\n');
} else {
liStart = -1;
}
liStarts.addLast(ensureParagraphBoundary(output));
} else if (!liStarts.isEmpty()) {
int start = liStarts.popLast();
trimStart(output, start);
int end = ensureParagraphBoundary(output);
// Add leading margin to ensure the bullet is not cut off
output.setSpan(new LeadingMarginSpan.Standard(leadingMargin), start, end, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
output.setSpan(new BulletSpan(bulletGapWidth), start, end, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
}
break;
}